CN113366203B - Engine tail gas ozone purification system and method - Google Patents

Engine tail gas ozone purification system and method Download PDF

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Publication number
CN113366203B
CN113366203B CN201980069653.6A CN201980069653A CN113366203B CN 113366203 B CN113366203 B CN 113366203B CN 201980069653 A CN201980069653 A CN 201980069653A CN 113366203 B CN113366203 B CN 113366203B
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electrode
ozone
nitric acid
present
electrocoagulation
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CN113366203A (en
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唐万福
王大祥
奚勇
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Shanghai Bixiufu Enterprise Management Co Ltd
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Shanghai Bixiufu Enterprise Management Co Ltd
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Priority claimed from PCT/CN2019/112137 external-priority patent/WO2020083162A1/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

An engine exhaust gas ozone purification system and method, wherein the engine exhaust gas ozone purification system comprises a reaction field (202) for mixing and reacting an ozone stream with an exhaust gas stream, a large amount of urea is not required to be added, and the purification effect is good.

Description

Engine tail gas ozone purification system and method
Technical Field
The invention belongs to the field of environmental protection, and relates to an engine tail gas ozone purification system and method.
Background
The pollution of the engine to the environment mainly comes from the exhaust products of the engine, namely engine exhaust, and at present, for the tail gas purification of diesel engines, the conventional technical route is to adopt an oxidation catalyst DOC to remove hydrocarbons THC and CO and oxidize low-valence NO into high-valence NO 2 The method comprises the steps of carrying out a first treatment on the surface of the Filtering particulate matter PM after the DOC with a diesel particulate filter DPF; urea is injected after the diesel particulate filter DPF, and the urea is decomposed into ammonia NH in the exhaust gas 3 ，NH 3 On the subsequent selective catalyst SCR and NO 2 Generating selective catalytic reduction reaction to generate nitrogen N 2 And water. Finally, excess NH is added to the ammonia oxidation catalyst ASC 3 Oxidation to N 2 And water, a large amount of urea is required to be added for purifying the tail gas of the engine in the prior art, and the purifying effect is general.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide an engine exhaust gas ozone purification system and method for solving at least one of the problems of the prior art that the exhaust gas purification requires a large amount of urea and that the exhaust gas purification effect is general. The research of the invention finds that the high-valence nitrogen oxides generated by the reaction of ozone and nitrogen oxides in the tail gas are not final products, and that enough Volatile Organic Compounds (VOC) in the tail gas generate enough water which can fully react with the high-valence nitrogen oxides to generate nitric acid, so that the engine tail gas is treated by ozone to remove NO by ozone X Better effect and unexpected technical effect.
The invention provides an engine tail gas ozone purification system and method.
To achieve the above and other related objects, the present invention provides the following examples:
1. example 1 provided by the present invention: an engine exhaust ozone purification system.
2. Example 2 provided by the present invention: including example 1 above, wherein the engine exhaust ozone purification system includes a reaction field for mixing and reacting an ozone stream with an exhaust stream.
3. Example 3 provided by the present invention: including example 2 above, wherein the reaction field comprises a conduit.
4. Example 4 provided by the present invention: including examples 2 or 3 above, wherein the reaction field comprises a reactor.
5. Example 5 provided by the present invention: including example 4 above, wherein the reactor has a reaction chamber where the tail gas and ozone mix and react.
6. Example 6 provided by the present invention: including examples 4 or 5 above, wherein the reactor comprises a plurality of honeycomb cavities for providing a space for mixing and reacting the exhaust gas with ozone; and gaps are arranged between the honeycomb cavities and are used for introducing cold medium to control the reaction temperature of tail gas and ozone.
7. Example 7 provided by the present invention: comprising any of the above examples 4 to 6, wherein the reactor comprises a number of carrier units providing a reaction site.
8. Example 8 provided by the present invention: including any one of examples 4 to 7 above, wherein the reactor includes a catalyst unit for promoting an oxidation reaction of the exhaust gas.
9. Example 9 provided by the present invention: comprising any one of examples 2 to 8 above, wherein the reaction field is provided with an ozone inlet selected from at least one of a spout, a jet grille, a nozzle, a swirl nozzle, a spout provided with a venturi.
10. Example 10 provided by the present invention: comprising any one of examples 2 to 9 above, wherein the reaction field is provided with an ozone inlet through which ozone enters the reaction field to contact the exhaust gas, the ozone inlet being arranged to form at least one of: opposite to the flow direction of the exhaust gas, perpendicular to the flow direction of the exhaust gas, tangential to the flow direction of the exhaust gas, inserted into the flow direction of the exhaust gas, and contacted with the exhaust gas in multiple directions.
11. Example 11 provided by the present invention: including any of the above examples 2 to 10, wherein the reaction field includes an exhaust pipe, a thermal accumulator device, or a catalyst.
12. Example 12 provided by the present invention: including any of examples 2 to 11 above, wherein the temperature of the reaction field is-50-200 ℃.
13. Example 13 provided by the present invention: including example 12 above, wherein the temperature of the reaction field is 60-70 ℃.
14. Example 14 provided by the present invention: including any of examples 1-13 above, wherein the exhaust ozone purification system further includes an ozone source for providing an ozone stream.
15. Example 15 provided by the present invention: including example 14 above, wherein the ozone source comprises a storage ozone cell and/or an ozone generator.
16. Example 16 provided by the present invention: including example 15 above, wherein the ozone generator comprises a combination of one or more of a surface-extension discharge ozone generator, a power frequency arc ozone generator, a high frequency induction ozone generator, a low pressure ozone generator, an ultraviolet ozone generator, an electrolyte ozone generator, a chemical agent ozone generator, and a radiation particle generator.
17. Example 17 provided by the present invention: including example 15 above, wherein the ozone generator includes an electrode having a catalyst layer disposed thereon, the catalyst layer including an oxidation-catalytic bond-cleavage-selective catalyst layer.
18. Example 18 provided by the present invention: including the above example 17, wherein the electrode includes a high-voltage electrode or a high-voltage electrode provided with a blocking dielectric layer, the oxidation-catalyst bond-cracking selective catalyst layer is provided on a surface of the high-voltage electrode when the electrode includes a high-voltage electrode, and the oxidation-catalyst bond-cracking selective catalyst layer is provided on a surface of the blocking dielectric layer when the electrode includes a high-voltage electrode of the blocking dielectric layer.
19. Example 19 provided by the present invention: including example 18 above, wherein the barrier dielectric layer is selected from at least one of a ceramic plate, a ceramic tube, a quartz glass plate, a quartz plate, and a quartz tube.
20. Example 20 provided by the present invention: including the above example 18, wherein, when the electrode includes a high-voltage electrode, the thickness of the oxidation catalytic bond cleavage-selective catalyst layer is 1 to 3mm; when the electrode comprises a high voltage electrode of a barrier dielectric layer, the loading of the oxidative catalytic bond cleavage selective catalyst layer comprises 1-12wt% of the barrier dielectric layer.
21. Example 21 provided by the present invention: including any one of examples 17 to 20 above, wherein the oxidation catalytic bond cracking selective catalyst layer includes the following components in weight percent:
5-15% of active component;
85-95% of coating;
wherein the active component is at least one of a metal M and a compound of a metal element M, and the metal element M is at least one of an alkaline earth metal element, a transition metal element, a fourth main group metal element, a noble metal element and a lanthanide rare earth element;
the coating is selected from at least one of alumina, ceria, zirconia, manganese oxide, a metal composite oxide including a composite oxide of one or more metals of aluminum, cerium, zirconium, and manganese, a porous material, and a layered material.
22. Example 22 provided by the present invention: including the above example 21, wherein the alkaline earth metal element is selected from at least one of magnesium, strontium, and calcium.
23. Example 23 provided by the present invention: including the above example 21, wherein the transition metal element is selected from at least one of titanium, manganese, zinc, copper, iron, nickel, cobalt, yttrium, and zirconium.
24. Example 24 provided by the present invention: including the above example 21, wherein the fourth main group metal element is tin.
25. Example 25 provided by the present invention: including the above example 21, wherein the noble metal element is at least one selected from the group consisting of platinum, rhodium, palladium, gold, silver, and iridium.
26. Example 26 provided by the present invention: including example 21 above, wherein the lanthanide rare earth element is at least one selected from lanthanum, cerium, praseodymium, and samarium.
27. Example 27 provided by the present invention: including the above example 21, wherein the compound of the metal element M is selected from at least one of an oxide, a sulfide, a sulfate, a phosphate, a carbonate, and a perovskite.
28. Example 28 provided by the present invention: including example 21 above, wherein the porous material is selected from at least one of molecular sieves, diatomaceous earth, zeolites, and carbon nanotubes.
29. Example 29 provided by the present invention: including example 21 above, wherein the layered material is selected from at least one of graphene and graphite.
30. Example 30 provided by the present invention: comprising any one of the above examples 1 to 29, wherein the exhaust gas ozone purification system further comprises an ozone amount control device for controlling an amount of ozone so as to effectively oxidize a gas component to be treated in the exhaust gas, the ozone amount control device comprising a control unit.
31. Example 31 provided by the present invention: including example 30 described above, wherein the control unit controls the amount of ozone required for the mixing reaction based on the content of the pre-ozone treatment tail gas components.
32. Example 32 provided by the present invention: the above example 30 or 31 is included, wherein the ozone amount control device further includes an ozone pre-treatment exhaust gas component detecting unit configured to detect an ozone pre-treatment exhaust gas component content.
33. Example 33 provided by the present invention: the exhaust gas component detection unit before ozone treatment includes a first nitrogen oxide detection unit for detecting a nitrogen oxide content in the exhaust gas before ozone treatment, including the above example 32.
34. Example 34 provided by the present invention: the above example 32 or 33 is included, wherein the pre-ozone-treatment exhaust gas component detection unit includes a first CO detection unit for detecting a CO content in the pre-ozone-treatment exhaust gas.
35. Example 35 provided by the present invention: the exhaust gas component detection unit before ozone treatment includes any one of examples 32 to 34 described above, wherein the exhaust gas component detection unit before ozone treatment includes a first volatile organic compound detection unit for detecting a volatile organic compound content in the exhaust gas before ozone treatment.
36. Example 36 provided by the present invention: including any one of the above examples 33 to 35, wherein the control unit controls the amount of ozone required for the mixing reaction based on an output value of at least one of the pre-ozone-treatment exhaust gas component detection units.
37. Example 37 provided by the present invention: including any of the above examples 30 to 36, wherein the control unit is configured to control an amount of ozone required for the mixing reaction according to a preset mathematical model.
38. Example 38 provided by the present invention: including any one of the above examples 30 to 37, wherein the control unit is configured to control an amount of ozone required for the mixing reaction according to a theoretical estimated value.
39. Example 39 provided by the present invention: including any of the above examples 38, wherein the theoretical estimate is: the molar ratio of the ozone inlet amount to the substances to be treated in the tail gas is 2-10.
40. Example 40 provided by the present invention: including any one of examples 30 to 39 above, wherein the control unit controls an amount of ozone required for the mixing reaction in accordance with the content of the ozonized exhaust gas component.
41. Example 41 provided by the present invention: the exhaust gas composition control apparatus according to any one of examples 30 to 40, wherein the ozone amount control device includes an ozone post-treatment exhaust gas composition detection unit for detecting an ozone post-treatment exhaust gas composition content.
42. Example 42 provided by the present invention: including example 41 above, wherein the post-ozone treatment exhaust gas component detection unit includes a first ozone detection unit for detecting an ozone content in the post-ozone treatment exhaust gas.
43. Example 43 provided by the present invention: including the above example 41 or 42, wherein the ozone-treated exhaust gas component detecting unit includes a second nitrogen oxide detecting unit for detecting a nitrogen oxide content in the ozone-treated exhaust gas.
44. Example 44 provided by the present invention: including any one of the above examples 41 to 43, wherein the ozone-treated exhaust gas component detecting unit includes a second CO detecting unit for detecting a CO content in the ozone-treated exhaust gas.
45. Example 45 provided by the present invention: including any one of the above examples 41 to 44, wherein the post-ozone treatment exhaust gas component detection unit includes a second volatile organic compound detection unit for detecting a volatile organic compound content in the post-ozone treatment exhaust gas.
46. Example 46 provided by the present invention: including any one of the above examples 42 to 45, wherein the control unit controls the amount of ozone based on an output value of at least one of the post-ozone-treatment exhaust gas component detection units.
47. Example 47 provided by the present invention: including any of examples 1 to 46 above, wherein the exhaust ozone purification system further comprises a denitrification device for removing nitric acid from the mixed reaction product of the ozone stream and the exhaust stream.
48. Example 48 provided by the present invention: including example 47 above, wherein the denitration device comprises an electrocoagulation device comprising:
an electrocoagulation flow channel;
a first electrode positioned in the electrocoagulation channel;
and a second electrode.
49. Example 49 provided by the present invention: including example 48 above, wherein the first electrode is one or more of a solid, a liquid, a gaseous cluster, a plasma, a conductive mixed state substance, a natural mixing of a conductive substance by an organism, or a manual processing of the object to form a conductive substance.
50. Example 50 provided by the present invention: examples 48 or 49 above are included, wherein the first electrode is solid metal, graphite, or 304 steel.
51. Example 51 provided by the present invention: including any one of examples 48 to 50 above, wherein the first electrode is in a dot shape, a line shape, a mesh shape, kong Banzhuang, a plate shape, a needle shape, a ball cage shape, a box shape, a tube shape, a natural form substance, or a processed form substance.
52. Example 52 provided by the present invention: including any of examples 48-51 above, wherein the first electrode is provided with a front via.
53. Example 53 provided by the present invention: including the example 52 described above, wherein the front through-hole has a shape of a polygon, a circle, an ellipse, a square, a rectangle, a trapezoid, or a diamond.
54. Example 54 provided by the present invention: including examples 52 or 53 above, wherein the front through hole has a pore size of 0.1-3 mm.
55. Example 55 provided by the present invention: including any one of examples 48 to 54 above, wherein the second electrode is in a multi-layer mesh, net, kong Banzhuang, tube, barrel, ball cage, box, plate, pellet stacked layer, bent plate, or panel shape.
56. Example 56 provided by the present invention: including any of examples 48-55 above, wherein the second electrode is provided with a rear via.
57. Example 57 provided by the present invention: including the example 56 described above, wherein the rear through-hole has a polygonal shape, a circular shape, an elliptical shape, a square shape, a rectangular shape, a trapezoid shape, or a diamond shape.
58. Example 58 provided by the present invention: examples 56 or 57 above are included, wherein the aperture of the rear through-hole is 0.1-3 mm.
59. Example 59 provided by the present invention: including any of examples 48-58 above, wherein the second electrode is made of a conductive substance.
60. Example 60 provided by the present invention: including any of the above examples 48 to 59, wherein a surface of the second electrode has a conductive substance.
61. Example 61 provided by the present invention: including any of examples 48 to 60 above, wherein the first electrode and the second electrode have an electrocoagulation electric field therebetween, the electrocoagulation electric field being one or more of a point-plane electric field, a line-plane electric field, a net-plane electric field, a point-bucket electric field, a line-bucket electric field, or a net-bucket electric field.
62. Example 62 provided by the present invention: including any one of examples 48 to 61 above, wherein the first electrode is linear and the second electrode is planar.
63. Example 63 provided by the present invention: including any of examples 48 to 62 above, wherein the first electrode is perpendicular to the second electrode.
64. Example 64 provided by the present invention: including any of examples 48 to 63 above, wherein the first electrode is parallel to the second electrode.
65. Example 65 provided by the present invention: including any of examples 48-64 above, wherein the first electrode is curved or arcuate.
66. Example 66 provided by the present invention: including any of examples 48-65 above, wherein the first electrode and the second electrode are each planar and the first electrode is parallel to the second electrode.
67. Example 67 provided by the present invention: including any of examples 48 to 66 above, wherein the first electrode is a wire mesh.
68. Example 68 provided by the present invention: including any of examples 48-67 above, wherein the first electrode is planar or spherical.
69. Example 69 provided by the present invention: including any of examples 48 to 68 above, wherein the second electrode is curved or spherical.
70. Example 70 provided by the present invention: including any one of examples 48 to 69 above, wherein the first electrode is dot-shaped, linear, or mesh-shaped, the second electrode is barrel-shaped, the first electrode is located inside the second electrode, and the first electrode is located on a central symmetry axis of the second electrode.
71. Example 71 provided by the present invention: including any of examples 48-70 above, wherein the first electrode is electrically connected to one electrode of a power source and the second electrode is electrically connected to another electrode of the power source.
72. Example 72 provided by the present invention: including any of examples 48-71 above, wherein the first electrode is electrically connected to a cathode of the power supply and the second electrode is electrically connected to an anode of the power supply
73. Example 73 provided by the present invention: examples 71 or 72 above are included, wherein the voltage of the power supply is 5-50KV.
74. Example 74 provided by the present invention: including any of examples 71 to 73 above, wherein the voltage of the power supply is less than the onset corona onset voltage.
75. Example 75 provided by the present invention: including any of the above examples 71-74, wherein the voltage of the power source is 0.1kv-2kv/mm.
76. Example 76 provided by the present invention: including any of examples 71-75 above, wherein the voltage waveform of the power source is a direct current waveform, a sine wave, or a modulated waveform.
77. Example 77 provided by the present invention: including any of examples 71 to 76 above, wherein the power source is an ac power source and the variable frequency pulses of the power source range from 0.1Hz to 5GHz.
78. Example 78 provided by the present invention: including any one of the above examples 48 to 77, wherein the first electrode and the second electrode each extend in a left-right direction, and a left end of the first electrode is located to the left of a left end of the second electrode.
79. Example 79 provided by the present invention: including any of examples 48 to 78 above, wherein there are two of the second electrodes and the first electrode is located between the two second electrodes.
80. Example 80 provided by the present invention: including any of the above examples 48 to 79, wherein the distance between the first electrode and the second electrode is 5-50 millimeters.
81. Example 81 provided by the present invention: including any one of examples 48 to 80 above, wherein the first electrode and the second electrode constitute an adsorption unit, and the adsorption unit is plural.
82. Example 82 provided by the present invention: including the above example 81 in which all the adsorption units are distributed in one or more of the left-right direction, the front-rear direction, the diagonal direction, or the spiral direction.
83. Example 83 provided by the present invention: including any of examples 48 to 82 above, wherein an electrocoagulation housing comprising an electrocoagulation inlet, an electrocoagulation outlet, and the electrocoagulation flow channel, both ends of the electrocoagulation flow channel being in communication with the electrocoagulation inlet and the electrocoagulation outlet, respectively.
84. Example 84 provided by the present invention: including example 83 above, wherein the electrocoagulation inlet is circular and the diameter of the electrocoagulation inlet is 300-1000mm, or 500mm.
85. Example 85 provided by the present invention: examples 83 or 84 above are included, wherein the electrocoagulation outlet is circular and the diameter of the electrocoagulation outlet is 300-1000mm, or 500mm.
86. Example 86 provided by the present invention: including any one of examples 83 to 85 above, wherein the electrocoagulation housing comprises a first housing section, a second housing section, and a third housing section distributed sequentially from an electrocoagulation inlet to an electrocoagulation outlet, the electrocoagulation inlet being located at one end of the first housing section, and the electrocoagulation outlet being located at one end of the third housing section.
87. Example 87 provided by the present invention: including the example 86 described above, wherein the first housing portion has a contour that increases in size from the electrocoagulation inlet to the electrocoagulation outlet.
88. Example 88 provided by the present invention: including examples 86 or 87 above, wherein the first housing portion is straight.
89. Example 89 provided by the present invention: including any of the above examples 86-88, wherein the second housing portion is straight tubular and the first and second electrodes are mounted in the second housing portion.
90. Example 90 provided by the present invention: including any of the above examples 86-89, wherein the third housing portion has a contour that tapers in size from the electrocoagulation inlet to the electrocoagulation outlet.
91. Example 91 provided by the present invention: including any of the above examples 86-90, wherein the first, second, and third housing portions are each rectangular in cross-section.
92. Example 92 provided by the present invention: including any one of examples 83 to 91 above, wherein the electrocoagulation housing is made of stainless steel, aluminum alloy, iron alloy, cloth, sponge, molecular sieve, activated carbon, foam iron, or foam silicon carbide.
93. Example 93 provided by the present invention: including any of examples 48 to 92 above, wherein the first electrode is connected to the electrocoagulation housing by an electrocoagulation insulator.
94. Example 94 provided by the present invention: the above example 93 was included, wherein the material of the electrocoagulation insulator was insulating mica.
95. Example 95 provided by the present invention: including examples 93 or 94 above, wherein the electrocoagulation insulator is columnar, or tower-shaped.
96. Example 96 provided by the present invention: including any of examples 48 to 95 above, wherein the first electrode is provided with a front connecting portion having a cylindrical shape, and the front connecting portion is fixedly connected with the electrocoagulation insulating member.
97. Example 97 provided by the present invention: including any of examples 48 to 96 above, wherein the second electrode is provided with a rear connecting portion having a cylindrical shape, and the rear connecting portion is fixedly connected with the electrocoagulation insulating member.
98. Example 98 provided by the present invention: including any of the above examples 48 to 97, wherein a ratio of a cross-sectional area of the first electrode to a cross-sectional area of the electrocoagulation channel is 99% to 10%, or 90% to 10%, or 80% to 20%, or 70% to 30%, or 60% to 40%, or 50%.
99. Example 99 provided by the present invention: including any one of examples 47 to 98 above, wherein the denitration device includes a condensation unit configured to condense the tail gas after the ozone treatment, to achieve gas-liquid separation.
100. Example 100 provided by the present invention: including any one of examples 47-99 above, wherein the denitration device includes a leaching unit for leaching the ozone-treated tail gas.
101. Example 101 provided by the present invention: including the example 100 described above, wherein the denitration apparatus further includes a rinse solution unit to provide rinse solution to the rinse unit.
102. Example 102 provided by the present invention: including example 101 above, wherein the leacheate in the leacheate unit comprises water and/or a base.
103. Example 103 provided by the present invention: including any one of examples 47 to 102 above, wherein the denitration device further includes a denitration liquid collection unit for storing the nitric acid aqueous solution and/or the nitric acid aqueous solution removed from the tail gas.
104. Example 104 provided by the present invention: including the above example 103, wherein when the aqueous nitric acid solution is stored in the denitration liquid collection unit, the denitration liquid collection unit is provided with an alkali liquid addition unit for forming nitrate with nitric acid.
105. Example 105 provided by the present invention: including any one of examples 1 to 104 above, wherein the exhaust gas ozone purification system further includes an ozone digestion device for digesting ozone in the exhaust gas after the treatment of the reaction field.
106. Example 106 provided by the present invention: including the above example 105, wherein the ozone digester is selected from at least one of an ultraviolet ozone digester and a catalytic ozone digester.
107. Example 107 provided by the present invention: comprising any one of examples 1 to 106 above, wherein the exhaust gas ozone purification system further comprises a first denitration device for removing nitrogen oxides in the exhaust gas; the reaction field is used for mixing and reacting the tail gas treated by the first denitration device with an ozone stream, or mixing and reacting the tail gas with the ozone stream before the tail gas is treated by the first denitration device.
108. Example 108 provided by the present invention: including example 107 above, wherein the first denitration device is selected from at least one of a non-catalytic reduction device, a selective catalytic reduction device, a non-selective catalytic reduction device, and an electron beam denitration device.
109. Example 109 provided by the present invention: including any of examples 1-108 above, wherein the engine is further included.
110. Example 110 provided by the present invention: an exhaust gas ozone purification method, comprising the following steps: mixing the ozone stream with the tail gas stream for reaction.
111. Example 111 provided by the present invention: the exhaust gas ozone purification method comprising example 110, wherein the exhaust gas stream comprises nitrogen oxides and volatile organic compounds.
112. Example 112 provided by the present invention: the exhaust gas ozone purification method comprising example 110 or 111, wherein in a low temperature section of the exhaust gas, the ozone stream is mixed with the exhaust gas stream to react.
113. Example 113 provided by the present invention: the exhaust gas ozone purification method comprising any one of examples 110 to 112, wherein a mixing reaction temperature of the ozone stream and the exhaust gas stream is-50 to 200 ℃.
114. Example 114 provided by the present invention: the exhaust gas ozone purification method including example 113, wherein the mixing reaction temperature of the ozone stream and the exhaust gas stream is 60 to 70 ℃.
115. Example 115 provided by the present invention: the exhaust gas ozone purification method comprising any one of examples 110 to 114, wherein the mixing of the ozone stream and the exhaust gas stream is performed in a manner selected from at least one of venturi mixing, positive pressure mixing, insert mixing, dynamic mixing, and fluid mixing.
116. Example 116 provided by the present invention: the exhaust gas ozone purification method including example 115, wherein, when the mixing manner of the ozone stream and the exhaust gas stream is positive pressure mixing, the pressure of ozone intake is greater than the pressure of the exhaust gas.
117. Example 117 provided by the present invention: the exhaust gas ozone purification method comprising example 110, wherein the flow rate of the exhaust gas stream is increased and the venturi principle is used to mix the ozone stream before the ozone stream is mixed with the exhaust gas stream.
118. Example 118 provided by the present invention: the exhaust gas ozone purification method according to example 110, wherein the mixing mode of the ozone stream and the exhaust gas stream is at least one selected from the group consisting of reverse flow inlet of the exhaust gas outlet, mixing in the front section of the reaction field, front and rear insertion of the dust remover, front and rear mixing in the denitration device, front and rear mixing in the catalytic device, front and rear inlet of the washing device, front and rear mixing in the filtration device, front and rear mixing in the muffler device, mixing in the exhaust gas pipe, external mixing in the adsorption device, and front and rear mixing in the condensation device.
119. Example 119 provided by the present invention: the exhaust gas ozone purification method comprising example 110, wherein the reaction field in which the ozone stream is mixed with the exhaust gas stream to react comprises a pipe and/or a reactor.
120. Example 120 provided by the present invention: the exhaust ozone purification method comprising any one of examples 110 to 119, wherein the reaction field comprises an exhaust pipe, a thermal accumulator device, or a catalyst.
121. Example 121 provided by the present invention: the exhaust gas ozone purification method including example 120, further comprising at least one of the following technical features:
1) The diameter of the pipe section of the pipeline is 100-200 mm;
2) The length of the pipeline is 0.1 times greater than the pipe diameter;
3) The reactor is selected from at least one of the following:
reactor one: the reactor is provided with a reaction chamber, and tail gas and ozone are mixed and reacted in the reaction chamber;
and (2) a second reactor: the reactor comprises a plurality of honeycomb cavities for providing a space for mixing and reacting tail gas and ozone; a gap is arranged between the honeycomb cavities and is used for introducing a cold medium to control the reaction temperature of tail gas and ozone;
and (3) a third reactor: the reactor comprises a plurality of carrier units, wherein the carrier units provide a reaction site;
and a fourth reactor: the reactor comprises a catalyst unit for promoting the oxidation reaction of the tail gas;
4) The reaction field is provided with an ozone inlet, and the ozone inlet is at least one selected from a nozzle, a spray grid, a nozzle, a cyclone nozzle and a nozzle provided with a venturi tube;
5) The reaction field is provided with an ozone inlet, ozone enters the reaction field through the ozone inlet to be contacted with tail gas, and the arrangement of the ozone inlet forms at least one of the following directions: opposite to the flow direction of the exhaust gas, perpendicular to the flow direction of the exhaust gas, tangential to the flow direction of the exhaust gas, inserted into the flow direction of the exhaust gas, and contacted with the exhaust gas in multiple directions.
122. Example 122 provided by the present invention: including the exhaust gas ozone purification method of any one of examples 110 to 121, wherein the ozone stream is provided by a storage ozone unit and/or an ozone generator.
123. Example 123 provided by the present invention: the exhaust gas ozone purification method comprising example 122, wherein the ozone generator comprises a combination of one or more of a surface-extended discharge ozone generator, a power frequency arc ozone generator, a high frequency induction ozone generator, a low air pressure ozone generator, an ultraviolet ozone generator, an electrolyte ozone generator, a chemical agent ozone generator, and a radiation particle generator.
124. Example 124 provided by the present invention: including the exhaust gas ozone purification method of example 122, wherein the ozone stream providing method: under the action of the electric field and the selective catalyst for oxidative catalytic bond cracking, the gas containing oxygen generates ozone, wherein the electrode forming the electric field is loaded with the selective catalyst for oxidative catalytic bond cracking.
125. Example 125 provided by the present invention: the exhaust gas ozone purifying method including example 124, wherein the electrode includes a high-voltage electrode or an electrode provided with a blocking dielectric layer, the oxidation-catalyst-bond-cracking selective catalyst is supported on a surface of the high-voltage electrode when the electrode includes the high-voltage electrode of the blocking dielectric layer, and the oxidation-catalyst-bond-cracking selective catalyst is supported on a surface of the blocking dielectric layer when the electrode includes the high-voltage electrode of the blocking dielectric layer.
126. Example 126 provided by the present invention: the exhaust gas ozone purification method including example 124, wherein, when the electrode includes a high-voltage electrode, a thickness of the oxidative catalytic bond cleavage-selective catalyst is 1 to 3mm; when the electrode comprises a high voltage electrode of a barrier dielectric layer, the loading of the oxidative catalytic bond cleavage selective catalyst comprises 1 to 10wt% of the barrier dielectric layer.
127. Example 127 provided by the present invention: the exhaust gas ozone purification method comprising any one of examples 124-126, wherein the oxidative catalytic bond cracking selective catalyst comprises the following components in weight percent:
5-15% of active components;
85-95% of coating;
wherein the active component is at least one of a metal M and a compound of a metal element M, and the metal element M is at least one of an alkaline earth metal element, a transition metal element, a fourth main group metal element, a noble metal element and a lanthanide rare earth element;
The coating is selected from at least one of alumina, ceria, zirconia, manganese oxide, a metal composite oxide including a composite oxide of one or more metals of aluminum, cerium, zirconium, and manganese, a porous material, and a layered material.
128. Example 128 provided by the present invention: the exhaust gas ozone purifying method including example 127, wherein the alkaline earth metal element is selected from at least one of magnesium, strontium, and calcium.
129. Example 129 provided by the present invention: the exhaust gas ozone purifying method including example 127, wherein the transition metal element is selected from at least one of titanium, manganese, zinc, copper, iron, nickel, cobalt, yttrium, and zirconium.
130. Example 130 provided by the present invention: the exhaust gas ozone purifying method including example 127, wherein the fourth main group metal element is tin.
131. Example 131 provided by the present invention: the exhaust gas ozone purifying method including example 127, wherein the noble metal element is selected from at least one of platinum, rhodium, palladium, gold, silver, and iridium.
132. Example 132 provided by the present invention: the exhaust gas ozone purifying method including example 127, wherein the lanthanide rare earth element is at least one selected from lanthanum, cerium, praseodymium, and samarium.
133. Example 133 provided by the present invention: the exhaust gas ozone purifying method including example 127, wherein the compound of the metal element M is selected from at least one of an oxide, a sulfide, a sulfate, a phosphate, a carbonate, and a perovskite.
134. Example 134 provided by the present invention: the exhaust gas ozone purifying method including example 127, wherein the porous material is selected from at least one of molecular sieves, diatomaceous earth, zeolite, and carbon nanotubes.
135. Example 135 provided by the present invention: the exhaust gas ozone purification method comprising example 127, wherein the layered material is selected from at least one of graphene and graphite.
136. Example 136 provided by the present invention: the exhaust ozone purification method comprising any one of examples 124 to 126, wherein the electrode is loaded with an oxygen double catalytic bond cracking selective catalyst by a dipping and/or spraying method.
137. Example 137 provided by the present invention: the exhaust gas ozone purification method including example 136, comprising the steps of:
1) According to the composition ratio of the catalyst, the slurry of the coating raw material is loaded on the surface of the high-voltage electrode or the surface of the blocking dielectric layer, and the high-voltage electrode or the blocking dielectric layer loaded with the coating is obtained through drying and calcining;
2) Loading a raw material solution or slurry containing metal elements M onto the coating obtained in the step 1) according to the composition ratio of the catalyst, drying, calcining, and setting a high-voltage electrode on the other surface of the barrier dielectric layer opposite to the loaded coating after calcining when the coating is loaded on the surface of the barrier dielectric layer, thereby obtaining the electrode for the ozone generator; or, loading a raw material solution or slurry containing metal elements M onto the coating obtained in the step 1) according to the composition ratio of the catalyst, drying, calcining and post-treating, wherein when the coating is loaded on the surface of the barrier medium layer, a high-voltage electrode is arranged on the other surface of the barrier medium layer opposite to the loaded coating after the post-treatment, and the electrode for the ozone generator is obtained;
wherein the control of the morphology of the active component in the electrode catalyst is achieved by the calcination temperature and atmosphere, and the post-treatment.
138. Example 138 provided by the present invention: the exhaust gas ozone purification method including example 136, comprising the steps of:
1) According to the composition ratio of the catalyst, loading a raw material solution or slurry containing metal elements M on a coating raw material, drying and calcining to obtain a coating material loaded with active components;
2) Preparing the coating material loaded with the active components obtained in the step 1) into slurry according to the composition ratio of the catalyst, loading the slurry on the surface of a high-voltage electrode or the surface of a barrier dielectric layer, drying, calcining, and setting a high-voltage electrode on the other surface of the barrier dielectric layer opposite to the loaded coating after calcining when the coating is loaded on the surface of the barrier dielectric layer, thereby obtaining the electrode for the ozone generator; or preparing the coating material loaded with the active components obtained in the step 1) into slurry according to the composition ratio of the catalyst, loading the slurry on the surface of a high-voltage electrode or the surface of a barrier dielectric layer, drying, calcining and post-treating, and setting a high-voltage electrode on the other surface of the barrier dielectric layer opposite to the loading coating after the post-treating when the coating is loaded on the surface of the barrier dielectric layer, so as to obtain the electrode for the ozone generator;
Wherein the control of the morphology of the active component in the electrode catalyst is achieved by the calcination temperature and atmosphere, and the post-treatment.
139. Example 139 provided by the present invention: the exhaust ozone purification method comprising any one of examples 110 to 138, wherein comprising: the ozone amount of the ozone stream is controlled so as to effectively oxidize the gas component to be treated in the tail gas.
140. Example 140 provided by the present invention: the exhaust gas ozone purification method comprising any one of examples 110 to 139, wherein an ozone amount of the ozone stream is controlled to achieve the following removal efficiency:
nitrogen oxide removal efficiency: 60 to 99.97 percent;
CO removal efficiency: 1-50%;
efficiency of volatile organic compound removal: 60 to 99.97 percent.
141. Example 141 provided by the present invention: the exhaust gas ozone purification method including example 139 or 140, comprising: and detecting the component content of the tail gas before ozone treatment.
142. Example 142 provided by the present invention: the exhaust gas ozone purification method of any one of examples 139 to 141, wherein an amount of ozone required for a mixing reaction is controlled according to a content of an exhaust gas component before the ozone treatment.
143. Example 143 provided by the present invention: the exhaust gas ozone purification method including example 141 or 142, wherein detecting the content of the constituents of the exhaust gas before ozone treatment is selected from at least one of:
Detecting the content of volatile organic compounds in the tail gas before ozone treatment;
detecting the content of CO in the tail gas before ozone treatment;
and detecting the content of nitrogen oxides in the tail gas before ozone treatment.
144. Example 144 provided by the present invention: the exhaust gas ozone purification method according to example 143, wherein an amount of ozone required for the mixing reaction is controlled based on at least one output value that detects a content of a component of the exhaust gas before ozone treatment.
145. Example 145 provided by the present invention: the exhaust gas ozone purification method of any one of examples 139 to 144, wherein an amount of ozone required for a mixing reaction is controlled according to a preset mathematical model.
146. Example 146 provided by the present invention: including the exhaust gas ozone purification method of any one of examples 139 to 145, wherein an amount of ozone required for the mixing reaction is controlled in accordance with a theoretical estimated value.
147. Example 147 provided by the present invention: the method for purifying exhaust gas ozone comprising example 146, wherein the theoretical estimated value is: the molar ratio of the ozone inlet amount to the substances to be treated in the tail gas is 2-10.
148. Example 148 provided by the present invention: the exhaust gas ozone purification method comprising any one of examples 139 to 147, comprising: and detecting the content of the components in the tail gas after ozone treatment.
149. Example 149 provided by the present invention: the exhaust gas ozone purification method of any one of examples 139 to 148, comprising controlling an amount of ozone required for a mixing reaction according to a content of the ozone-treated exhaust gas component.
150. Example 150 provided by the present invention: the exhaust gas ozone purification method comprising example 148 or 149, wherein detecting an ozone-treated exhaust gas component content is selected from at least one of:
detecting the ozone content in the tail gas after ozone treatment;
detecting the content of volatile organic compounds in the tail gas after ozone treatment;
detecting the content of CO in the tail gas after ozone treatment;
and detecting the content of nitrogen oxides in the tail gas after ozone treatment.
151. Example 151 provided by the present invention: the exhaust gas ozone purification method including example 150, wherein the ozone amount is controlled according to at least one output value that detects the content of the ozone-treated exhaust gas component.
152. Example 152 provided by the present invention: the exhaust gas ozone purification method comprising any one of examples 110 to 151, wherein the exhaust gas ozone purification method further comprises the steps of: nitric acid in the mixed reaction product of the ozone stream and the tail gas stream is removed.
153. Example 153 provided by the present invention: the exhaust gas ozone purification method comprising example 152, wherein a gas with nitric acid mist is caused to flow through the first electrode;
When the gas with the nitric acid mist flows through the first electrode, the first electrode charges the nitric acid mist in the gas, and the second electrode applies attractive force to the charged nitric acid mist, so that the nitric acid mist moves to the second electrode until the nitric acid mist is attached to the second electrode.
154. Example 154 provided by the present invention: the exhaust gas ozone purification method according to example 153, wherein the first electrode introduces electrons into the nitric acid mist, the electrons being transferred between mist droplets located between the first electrode and the second electrode, and more mist droplets being charged.
155. Example 155 provided by the present invention: including the exhaust gas ozone purification method of example 153 or 154, wherein electrons are conducted between the first electrode and the second electrode through the nitric acid mist and an electric current is formed.
156. Example 156 provided by the present invention: the exhaust ozone purification method comprising any one of examples 153-155, wherein the first electrode electrically charges the nitric acid mist by contacting the nitric acid mist.
157. Example 157 provided by the present invention: the exhaust ozone purification method comprising any one of examples 153-156, wherein the first electrode charges the nitric acid mist by way of energy fluctuations.
158. Example 158 provided by the present invention: the exhaust ozone purification method of any one of examples 153-157, comprising, wherein the nitric acid mist attached to the second electrode forms water droplets, the water droplets on the second electrode flowing into a collection tank.
159. Example 159 provided by the present invention: including the exhaust ozone purification method of example 158, wherein the water droplets on the second electrode flow into the collection tank under gravity.
160. Example 160 provided by the present invention: including the exhaust gas ozone purification method of example 158 or 159, wherein the gas flows with blowing water droplets into the collection tank.
161. Example 161 provided by the present invention: the exhaust ozone purification method of any one of examples 153-160, wherein the first electrode is one or more of a solid, a liquid, a gaseous cluster, a plasma, a conductive mixed state substance, a natural mixed conductive substance of an organism, or a combination of forms of a conductive substance formed by artificial processing of an object.
162. Example 162 provided by the present invention: the exhaust ozone purification method comprising any one of examples 153-161, wherein said first electrode is solid metal, graphite, or 304 steel.
163. Example 163 provided by the present invention: the exhaust ozone purification method comprising any one of examples 153-162, wherein the first electrode is in a dot, line, mesh, kong Banzhuang, plate, needle, ball, box, tube, natural form, or processed form.
164. Example 164 provided by the present invention: the exhaust ozone purification method of any one of examples 153-163, wherein a front through hole is provided on the first electrode.
165. Example 165 provided by the present invention: the exhaust gas ozone purification method of example 164, wherein the shape of the front through-hole is polygonal, circular, elliptical, square, rectangular, trapezoidal, or diamond.
166. Example 166 provided by the present invention: the exhaust gas ozone purification method according to example 164 or 165, wherein a pore diameter of the front through hole is 0.1 to 3 mm.
167. Example 167 provided by the present invention: the exhaust ozone purification method comprising any one of examples 153-166, wherein the second electrode is in a multi-layer mesh, net, kong Banzhuang, tube, barrel, ball cage, box, plate, particle packed layer, bent plate, or panel shape.
168. Example 168 provided by the present invention: the exhaust ozone purification method of any one of examples 153 to 167, wherein a rear through hole is provided on the second electrode.
169. Example 169 provided by the present invention: the exhaust gas ozone purification method of example 168, wherein the rear through-hole is polygonal, circular, elliptical, square, rectangular, trapezoidal, or diamond-shaped.
170. Example 170 provided by the present invention: the exhaust gas ozone purification method of example 168 or 169, wherein a pore diameter of the rear through hole is 0.1-3 mm.
171. Example 171 provided by the present invention: the exhaust ozone purification method comprising any one of examples 153 to 170, wherein said second electrode is made of an electrically conductive substance.
172. Example 172 provided by the present invention: the exhaust ozone purification method comprising any one of examples 153 to 171, wherein a surface of the second electrode has a conductive substance.
173. Example 173 provided by the present invention: the exhaust ozone purification method of any one of examples 153 to 172, wherein an electrocoagulation electric field is provided between the first electrode and the second electrode, the electrocoagulation electric field being one or more of a point-plane electric field, a line-plane electric field, a net-plane electric field, a point-bucket electric field, a line-bucket electric field, or a net-bucket electric field.
174. Example 174 provided by the present invention: the exhaust gas ozone purification method of any one of examples 153 to 173, wherein the first electrode is linear and the second electrode is planar.
175. Example 175 provided by the present invention: the exhaust ozone purification method comprising any one of examples 153 to 174, wherein the first electrode is perpendicular to the second electrode.
176. Example 176 provided by the present invention: the exhaust ozone purification method comprising any one of examples 153 to 175, wherein said first electrode is parallel to a second electrode.
177. Example 177 provided by the invention: the exhaust ozone purification method of any one of examples 153 to 176, wherein said first electrode is curved or arc-shaped.
178. Example 178 provided by the present invention: the exhaust ozone purification method of any one of examples 153 to 177, wherein the first electrode and the second electrode are each planar and the first electrode is parallel to the second electrode.
179. Example 179 provided by the present invention: the exhaust ozone purification method comprising any one of examples 153 to 178, wherein said first electrode is a wire mesh.
180. Example 180 provided by the present invention: the exhaust ozone purification method of any one of examples 153 to 179, wherein said first electrode is planar or spherical.
181. Example 181 provided by the present invention: the exhaust ozone purification method of any one of examples 153 to 180, wherein the second electrode is curved or spherical.
182. Example 182 provided by the present invention: the exhaust gas ozone purification method of any one of examples 153 to 181, wherein the first electrode is dot-shaped, linear, or mesh-shaped, the second electrode is barrel-shaped, the first electrode is located inside the second electrode, and the first electrode is located on a central symmetry axis of the second electrode.
183. Example 183 provided by the present invention: the exhaust ozone purification method of any one of examples 153 to 182, wherein the first electrode is electrically connected to one electrode of a power supply and the second electrode is electrically connected to another electrode of the power supply.
184. Example 184 provided by the present invention: the exhaust ozone purification method of any one of examples 153 to 183, wherein said first electrode is electrically connected to a cathode of a power supply and said second electrode is electrically connected to an anode of the power supply.
185. Example 185 provided by the present invention: the exhaust gas ozone purification method according to example 183 or 184, wherein a voltage of said power supply is 5-50KV.
186. Example 186 provided by the present invention: the exhaust ozone purification method comprising any one of examples 183 to 185, wherein a voltage of the power supply is less than an onset corona onset voltage.
187. Example 187 provided by the present invention: the exhaust gas ozone purifying method according to any one of examples 183 to 186, wherein a voltage of the power supply is 0.1kv-2kv/mm.
188. Example 188 provided by the present invention: the exhaust gas ozone purification method of any one of examples 183 to 187, wherein a voltage waveform of the power supply is a direct current waveform, a sine wave, or a modulated waveform.
189. Example 189 provided by the present invention: the exhaust ozone purification method of any one of examples 183 to 188, wherein the power source is an alternating current power source and the variable frequency pulse range of the power source is 0.1Hz to 5GHz.
190. Example 190 provided by the present invention: the exhaust gas ozone purification method of any one of examples 153 to 189, wherein the first electrode and the second electrode each extend in a left-right direction, a left end of the first electrode being located to the left of a left end of the second electrode.
191. Example 191 provided by the present invention: the exhaust ozone purification method comprising any one of examples 153 to 190, wherein there are two of said second electrodes, said first electrode being located between two second electrodes.
192. Example 192 provided by the present invention: including the exhaust gas ozone purification method of any one of examples 153 to 191, wherein a distance between the first electrode and the second electrode is 5-50 mm.
193. Example 193 provided by the present invention: the exhaust ozone purification method of any one of examples 153 to 192, wherein the first electrode and the second electrode constitute an adsorption unit, and the adsorption unit is plural.
194. Example 194 provided by the present invention: including the exhaust gas ozone purification method of example 193, wherein all adsorption units are distributed in one or more of a left-right direction, a front-rear direction, an oblique direction, or a spiral direction.
195. Example 195 provided by the present invention: the exhaust ozone purification method comprising any one of examples 153 to 194, wherein said first electrode is mounted in an electrocoagulation housing having an electrocoagulation inlet and an electrocoagulation outlet.
196. Example 196 provided by the present invention: the exhaust ozone purification method of example 195, wherein the electrocoagulation inlet is circular and the diameter of the electrocoagulation inlet is 300-1000 mm, or 500mm.
197. Example 197 provided by the present invention: the exhaust gas ozone purification method of example 195 or 196, wherein the electrocoagulation outlet is circular and the diameter of the electrocoagulation outlet is 300-1000 mm, or 500mm.
198. Example 198 provided by the present invention: the exhaust ozone purification method of any one of examples 195-197, wherein the electrocoagulation housing comprises a first housing portion, a second housing portion, and a third housing portion that are sequentially distributed from an electrocoagulation inlet to an electrocoagulation outlet, the electrocoagulation inlet being located at one end of the first housing portion, and the electrocoagulation outlet being located at one end of the third housing portion.
199. Example 199 provided by the present invention: the exhaust ozone purification method of example 198, wherein a profile of the first housing portion increases in size from an electrocoagulation inlet to an electrocoagulation outlet.
200. Example 200 provided by the present invention: the exhaust gas ozone purification method of example 198 or 199, wherein said first housing portion is straight tubular.
201. Example 201 provided by the present invention: the exhaust gas ozone purification method of any one of examples 198 to 200, wherein the second housing portion is straight tubular, and the first electrode and the second electrode are mounted in the second housing portion.
202. Example 202 provided by the present invention: the exhaust ozone purification method of any one of examples 198 to 201, wherein a contour size of said third housing portion gradually decreases from an electrocoagulation inlet to an electrocoagulation outlet.
203. Example 203 provided by the present invention: the exhaust ozone purification method of any one of examples 198 to 202, wherein cross-sections of the first housing portion, the second housing portion, and the third housing portion are all rectangular.
204. Example 204 provided by the present invention: the exhaust ozone purification method of any one of examples 195 to 203, wherein a material of the electrocoagulation housing is stainless steel, aluminum alloy, iron alloy, cloth, sponge, molecular sieve, activated carbon, foam iron, or foam silicon carbide.
205. Example 205 provided by the present invention: the exhaust ozone purification method comprising any one of examples 153 to 204, wherein said first electrode is connected to an electrocoagulation housing by an electrocoagulation insulator.
206. Example 206 provided by the present invention: the exhaust gas ozone purification method of example 205, wherein the material of the electrocoagulation insulator is insulating mica.
207. Example 207 provided by the present invention: the exhaust gas ozone purification method of example 205 or 206, wherein said electrocoagulation insulator is columnar or tower-shaped.
208. Example 208 provided by the present invention: the exhaust ozone purification method of any one of examples 153 to 207, wherein a front connecting portion having a cylindrical shape is provided on the first electrode, and the front connecting portion is fixedly connected with the electrocoagulation insulator.
209. Example 209 provided by the present invention: the exhaust ozone purification method of any one of examples 153 to 208, wherein a rear connection portion having a cylindrical shape is provided on the second electrode, and the rear connection portion is fixedly connected with the electrocoagulation insulating member.
210. Example 210 provided by the present invention: the exhaust ozone purification method comprising any one of examples 153 to 209, wherein said first electrode is located in an electrocoagulation channel; the gas with the nitric acid mist flows along the electric coagulation runner and flows through the first electrode; the ratio of the cross-sectional area of the first electrode to the cross-sectional area of the electrocoagulation channel is 99% -10%, or 90% -10%, or 80% -20%, or 70% -30%, or 60% -40%, or 50%.
211. Example 211 provided by the present invention: a method of ozone purification of exhaust comprising any one of examples 152 to 210, wherein the method of removing nitric acid from the reaction product of mixing an ozone stream with the exhaust stream: the reaction product of the ozone stream and the tail gas stream are mixed and condensed.
212. Example 212 provided by the present invention: a method of purifying exhaust gas ozone comprising any of examples 152 to 211, wherein the method of removing nitric acid from a mixed reaction product of an ozone stream and an exhaust gas stream: the reaction product of the ozone stream and the tail gas stream is mixed and leached.
213. Example 213 provided by the present invention: the exhaust gas ozone purification method comprising example 212, wherein the method of removing nitric acid from the mixed reaction product of the ozone stream and the exhaust gas stream further comprises: a rinse is provided to the mixed reaction product of the ozone stream and the tail gas stream.
214. Example 214 provided by the present invention: the method for purifying exhaust gas ozone of example 213, wherein the eluent is water and/or alkali.
215. Example 215 provided by the present invention: the exhaust ozone purification method of any one of examples 152 to 214, wherein the method of removing nitric acid from the mixed reaction product of the ozone stream and the exhaust stream further comprises: the aqueous nitric acid and/or aqueous nitric acid solution removed from the tail gas is stored.
216. Example 216 provided by the present invention: the exhaust gas ozone purification method of example 215 is included, wherein when an aqueous nitric acid solution is stored, an alkali solution is added to form nitrate with nitric acid.
217. Example 217 provided by the present invention: the exhaust gas ozone purification method comprising any one of examples 110 to 216, wherein the exhaust gas ozone purification method further comprises the steps of: and carrying out ozone digestion on the tail gas from which nitric acid is removed.
218. Example 218 provided by the present invention: the exhaust gas ozone purification method comprising example 217, wherein the ozone digestion is selected from at least one of ultraviolet digestion and catalytic digestion.
219. Example 219 provided by the present invention: the exhaust ozone purification method comprising any one of examples 110 to 218, wherein the exhaust ozone purification method further comprises the steps of: firstly removing nitrogen oxides in the tail gas; the tail gas flow after the first removal of the nitrogen oxides is mixed and reacted with the ozone flow, or the tail gas flow after the first removal of the nitrogen oxides is mixed and reacted with the ozone flow.
220. Example 220 provided by the present invention: the exhaust gas ozone purification method according to example 219 is included, wherein the first removal of nitrogen oxides from the exhaust gas is at least one selected from the group consisting of a non-catalytic reduction method, a selective catalytic reduction method, a non-selective catalytic reduction method, an electron beam denitration method, and the like.
Drawings
Fig. 1 is a schematic diagram of an engine exhaust ozone purification system.
Fig. 2 is a schematic view of an electrode for an ozone generator according to the present invention.
Fig. 3 is a second schematic view of the electrode for an ozone generator according to the present invention.
Fig. 4 is a schematic diagram of a discharge ozone generator in the prior art.
Fig. 5 is a schematic view showing an engine exhaust ozone purification system according to embodiment 1 of the invention.
Fig. 6 is a plan view showing a reaction field in the ozone purification system for an engine exhaust gas according to embodiment 1 of the invention.
Fig. 7 is a schematic view showing an ozone amount controlling device according to the present invention.
FIG. 8 is a schematic diagram showing the construction of an electrocoagulation device in embodiment 9 of the present invention.
FIG. 9 is a left side view of the electrocoagulation device in example 9 of the present invention.
FIG. 10 is a perspective view of an electrocoagulation device in example 9 of the present invention.
FIG. 11 is a schematic diagram showing the construction of an electrocoagulation device in embodiment 10 of the present invention.
FIG. 12 is a top view of the electrocoagulation device in embodiment 10 of the present invention.
FIG. 13 is a schematic diagram showing the construction of an electrocoagulation device in example 11 of the present invention.
FIG. 14 is a schematic view showing the construction of an electrocoagulation device in embodiment 12 of the present invention.
FIG. 15 is a schematic view showing the construction of an electrocoagulation device in example 13 of the present invention.
FIG. 16 is a schematic view showing the construction of an electrocoagulation device in example 14 of the present invention.
FIG. 17 is a schematic diagram showing the construction of an electrocoagulation device in embodiment 15 of the present invention.
FIG. 18 is a schematic diagram showing the construction of an electrocoagulation device in embodiment 16 of the present invention.
FIG. 19 is a schematic view showing the construction of an electrocoagulation device in example 17 of the present invention.
FIG. 20 is a schematic diagram showing the construction of an electrocoagulation device in embodiment 18 of the present invention.
FIG. 21 is a schematic view showing the construction of an electrocoagulation device in example 19 of the present invention.
FIG. 22 is a schematic diagram showing the construction of an electrocoagulation device in embodiment 20 of the present invention.
FIG. 23 is a schematic view showing the construction of an electrocoagulation device in example 21 of the present invention.
FIG. 24 is a schematic view showing the construction of an electrocoagulation device in embodiment 22 of the present invention.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
In one embodiment of the invention, the engine exhaust ozone purification system includes a reaction field for mixing and reacting an ozone stream with an exhaust stream. For example: treating the tail gas of the automobile engine 210, and generating an oxidation reaction by utilizing water in the tail gas and a tail gas pipeline 220 to oxidize organic volatile matters in the tail gas into carbon dioxide and water; and sulfur, nitrate and the like are collected harmlessly. The exhaust gas ozone purification system may further include an external ozone generator 230 for supplying ozone to the exhaust gas pipe 220 through an ozone delivery pipe 240, as shown in fig. 1, in which the arrow direction is the flow direction of the exhaust gas.
The molar ratio of ozone stream to tail gas stream may be 2-10, such as 5-6, 5.5-6.5, 5-7, 4.5-7.5, 4-8, 3.5-8.5, 3-9, 2.5-9.5, 2-10.
Ozone may be obtained in different ways in an embodiment of the invention. For example, ozone generated by surface-extended discharge is composed of a tubular and plate-type discharge component and an alternating-current high-voltage power supply, air subjected to electrostatic dust adsorption, water removal and oxygen enrichment enters a discharge channel, air oxygen is ionized to generate ozone, high-energy ions and high-energy particles, and the ozone, the high-energy ions and the high-energy particles are introduced into a reaction field such as a tail gas channel through positive pressure or negative pressure. A tube type surface-extending discharge structure is used, a cooling liquid is introduced into the discharge tube and the discharge tube outside the outer layer, electrodes are formed between electrodes in the discharge tube and conductors in the outer tube, 18kHz and 10kV high-voltage alternating current is introduced between the electrodes, high-energy ionization is generated on the inner wall of the outer tube and the outer wall of the inner tube, and oxygen is ionized to generate ozone. Ozone is fed to a reaction field such as a tail gas channel using positive pressure. When the molar ratio of the ozone stream to the tail gas stream is 2, the removal rate of VOCs is 50%; when the molar ratio of the ozone flow to the tail gas flow is 5, the removal rate of VOCs is more than 95%, then the concentration of the nitrogen oxide gas is reduced, and the removal rate of the nitrogen oxide is 90%; when the molar ratio of the ozone flow to the tail gas flow is more than 10, the removal rate of VOCs is more than 99%, then the concentration of the nitrogen oxide compound gas is reduced, and the removal rate of the nitrogen oxide compound is 99%. The electricity consumption was increased to 30 w/g.
The ultraviolet lamp tube generates ozone to generate 11-195 nanometer wavelength ultraviolet rays for gas discharge, directly irradiates the air around the lamp tube to generate ozone, high-energy ions and high-energy particles, and is introduced into a reaction field such as a tail gas channel through positive pressure or negative pressure. By using 172 nm wavelength and 185 nm wavelength ultraviolet discharge tubes, oxygen is ionized in the gas at the outer wall of the tube by lighting the tube, generating a large amount of oxygen ions, which are combined into ozone. Is fed into a reaction field such as a tail gas channel by positive pressure. When the molar ratio of 185 nm ultraviolet ozone flow to tail gas flow is 2, the removal rate of VOCs is 40%; when the molar ratio of 185 nanometer ultraviolet ozone flow to tail gas flow is 5, the removal rate of VOCs is more than 85 percent, then the concentration of nitrogen oxide gas is reduced, and the removal rate of nitrogen oxide is 70 percent; when the molar ratio of 185 nanometer ultraviolet ozone flow to tail gas flow is greater than 10, the removal rate of VOCs is more than 95%, then the concentration of nitrogen oxide gas is reduced, and the removal rate of nitrogen oxide is 95%. The power consumption is 25 w/g.
When the molar ratio of the 172-nanometer ultraviolet ozone flow to the tail gas flow is 2, the removal rate of VOCs is 45%; when the molar ratio of the 172 nm ultraviolet ozone flow to the tail gas flow is 5, the removal rate of VOCs is more than 89%, then the concentration of the nitrogen oxide gas is reduced, and the removal rate of the nitrogen oxide is 75%; when the molar ratio of the 172 nm ultraviolet ozone flow to the tail gas flow is more than 10, the removal rate of VOCs is more than 97%, then the concentration of the nitrogen oxide gas is reduced, and the removal rate of the nitrogen oxide is 95%. The power consumption is 22 w/g.
In one embodiment of the invention, the reaction field comprises a pipe and/or a reactor.
In an embodiment of the present invention, the reaction field further includes at least one of the following technical features:
6) The diameter of the pipeline is 100-200 mm;
7) The length of the pipeline is 0.1 times greater than the diameter of the pipeline;
8) The reactor is selected from at least one of the following:
reactor one: the reactor is provided with a reaction chamber, and tail gas and ozone are mixed and reacted in the reaction chamber;
and (2) a second reactor: the reactor comprises a plurality of honeycomb cavities for providing a space for mixing and reacting tail gas and ozone; a gap is arranged between the honeycomb cavities and is used for introducing a cold medium to control the reaction temperature of tail gas and ozone;
and (3) a third reactor: the reactor comprises a plurality of carrier units, wherein the carrier units provide a reaction field (such as a mesoporous ceramic body carrier with a honeycomb structure), the reaction is carried out in a gas phase when the carrier units are not provided, and the reaction time is accelerated when the carrier units are provided;
and a fourth reactor: the reactor comprises a catalyst unit for promoting the oxidation reaction of the tail gas;
9) The reaction field is provided with an ozone inlet, and the ozone inlet is at least one selected from a nozzle, a spray grid, a nozzle, a cyclone nozzle and a nozzle provided with a venturi tube; spout provided with venturi: the venturi tube is arranged in the nozzle, and ozone is mixed in by adopting a venturi principle;
10 The reaction field is provided with an ozone inlet, ozone enters the reaction field through the ozone inlet to be contacted with tail gas, and the arrangement of the ozone inlet forms at least one of the following directions: opposite to the flow direction of the tail gas, perpendicular to the flow direction of the tail gas, tangential to the flow direction of the tail gas, inserted into the flow direction of the tail gas, and contacted with the tail gas in multiple directions; the flow direction of the tail gas is opposite to the flow direction of the tail gas, namely, the tail gas enters in the opposite direction, so that the reaction time is increased, and the volume is reduced; the flow direction of the tail gas is vertical, and the Venturi effect is used; tangential to the flow direction of the tail gas, so that the mixing is convenient; the tail gas flow direction is inserted, so that the swirling flow is overcome; in multiple directions, against gravity.
In an embodiment of the present invention, the reaction field includes an exhaust pipe, a heat accumulator device or a catalyst, and ozone can clean and regenerate the heat accumulator, the catalyst and the ceramic body.
In one embodiment of the invention, the temperature of the reaction field is-50-200deg.C, which can be 60-70deg.C, 50-80deg.C, 40-90deg.C, 30-100deg.C, 20-110deg.C, 10-120deg.C, 0-130 deg.C, -10-140 deg.C, -20-150deg.C, -30-160deg.C, -40-170deg.C, -50-180deg.C, -180-190 deg.C or 190-200deg.C.
In one embodiment of the present invention, the temperature of the reaction field is 60-70 ℃.
In one embodiment of the present invention, the engine exhaust ozone purification system further comprises an ozone source for providing an ozone stream. The ozone stream can be generated immediately by an ozone generator or can be stored ozone. The reaction field may be in fluid communication with an ozone source, and the ozone stream provided by the ozone source may be introduced into the reaction field so as to be mixed with the tail gas stream, subjecting the tail gas stream to an oxidation treatment.
In one embodiment of the invention, the ozone source comprises a storage ozone unit and/or an ozone generator. The ozone source may include an ozone introduction conduit, and may also include an ozone generator, which may be a combination of one or more of an arc ozone generator, i.e., a surface discharge ozone generator, a power frequency arc ozone generator, a high frequency induction ozone generator, a low pressure ozone generator, an ultraviolet ozone generator, an electrolyte ozone generator, a chemical agent ozone generator, a radiation particle generator, and the like.
In an embodiment of the present invention, the ozone generator includes one or more of a surface-extended discharge ozone generator, a power frequency arc ozone generator, a high frequency induction ozone generator, a low pressure ozone generator, an ultraviolet ozone generator, an electrolyte ozone generator, a chemical agent ozone generator, and a radiation particle generator.
In one embodiment of the invention, the ozone generator comprises an electrode, and a catalyst layer is arranged on the electrode, wherein the catalyst layer comprises an oxidation catalytic bond cracking selective catalyst layer.
In an embodiment of the present invention, the electrode includes a high voltage electrode or a high voltage electrode provided with a blocking dielectric layer, when the electrode includes a high voltage electrode, the oxidation-catalyst-cracking selective catalyst layer 250 is disposed on a surface of the high voltage electrode 260 (as shown in fig. 2), and when the electrode includes a high voltage electrode 260 of the blocking dielectric layer 270, the oxidation-catalyst-cracking selective catalyst layer 250 is disposed on a surface of the blocking dielectric layer 270 (as shown in fig. 3).
The high voltage electrode refers to a direct current or alternating current electrode with a voltage higher than 500V. An electrode refers to a plate that is used to input or output an electrical current in a conductive medium (solid, gas, vacuum, or electrolyte solution). One pole of the input current is called anode or positive pole, and one pole of the output current is called cathode or negative pole.
The mechanism of discharge type ozone generation is mainly a physical (electrical) method. There are many types of discharge type ozone generators, but the basic principle is to generate an electric field by using high voltage, and then to weaken or even break double bonds of oxygen by using electric energy of the electric field to generate ozone. The schematic structure of the conventional discharge ozone generator is shown in fig. 4, and the discharge ozone generator comprises a high-voltage ac power supply 280, a high-voltage electrode 260, a blocking dielectric layer 270, an air gap 290 and a ground electrode 291. Under the action of the high voltage electric field, the dioxygen bonds of the oxygen molecules in the air gap 290 are broken by the electric energy, and ozone is generated. However, the generation of ozone by electric field energy is limited, and the current industry standard requires that the electricity consumption per kg of ozone is not more than 8kWh, and the average industry level is about 7.5 kWh.
In an embodiment of the present invention, the blocking dielectric layer is at least one selected from a ceramic plate, a ceramic tube, a quartz glass plate, a quartz plate, and a quartz tube. The ceramic plate and the ceramic tube can be aluminum oxide, zirconium oxide, silicon oxide or the like oxide or composite oxide thereof.
In an embodiment of the present invention, when the electrode includes a high voltage electrode, the thickness of the oxidation-catalyzed bond-cracking selective catalyst layer is 1 to 3mm, and the oxidation-catalyzed bond-cracking selective catalyst layer also serves as a blocking medium, such as 1 to 1.5mm or 1.5 to 3mm; when the electrode comprises a high voltage electrode of a barrier dielectric layer, the loading of the oxidative catalytic bond cleavage selective catalyst layer comprises 1 to 12wt%, such as 1 to 5wt% or 5 to 12wt%, of the barrier dielectric layer.
In one embodiment of the present invention, the oxidation-catalytic bond cleavage-selective catalyst layer comprises the following components in percentage by weight:
5 to 15 percent of active component, such as 5 to 8 percent, 8 to 10 percent, 10 to 12 percent, 12 to 14 percent or 14 to 15 percent;
85-95% of coating, such as 85-86%, 86-88%, 88-90%, 90-92% or 92-95%;
wherein the active component is at least one of a metal M and a compound of a metal element M, and the metal element M is at least one of an alkaline earth metal element, a transition metal element, a fourth main group metal element, a noble metal element and a lanthanide rare earth element;
The coating is selected from at least one of alumina, ceria, zirconia, manganese oxide, a metal composite oxide including a composite oxide of one or more metals of aluminum, cerium, zirconium, and manganese, a porous material, and a layered material.
In an embodiment of the present invention, the alkaline earth metal element is at least one selected from magnesium, strontium and calcium.
In an embodiment of the present invention, the transition metal element is at least one selected from the group consisting of titanium, manganese, zinc, copper, iron, nickel, cobalt, yttrium, and zirconium.
In an embodiment of the invention, the fourth main group metal element is tin.
In an embodiment of the present invention, the noble metal element is at least one selected from the group consisting of platinum, rhodium, palladium, gold, silver and iridium.
In an embodiment of the present invention, the lanthanide rare earth element is at least one selected from lanthanum, cerium, praseodymium and samarium.
In an embodiment of the present invention, the compound of the metal element M is at least one selected from the group consisting of oxides, sulfides, sulfates, phosphates, carbonates, and perovskites.
In an embodiment of the present invention, the porous material is at least one selected from the group consisting of molecular sieves, diatomaceous earth, zeolite, and carbon nanotubes. The porosity of the porous material is more than 60%, such as 60-80%, the specific surface area is 300-500 square meters per gram, and the average pore diameter is 10-100 nanometers.
In an embodiment of the present invention, the layered material is at least one selected from graphene and graphite.
The selective catalyst layer combines chemical and physical methods, reduces, weakens and even directly breaks the dioxygen bond, fully exerts and utilizes the synergistic effect of an electric field and catalysis, and achieves the aim of greatly improving the ozone generation rate and the ozone generation amount, and compared with the existing discharge type ozone generator, the ozone generator provided by the invention has the advantages that the ozone generation amount is improved by 10-30% and the ozone generation rate is improved by 10-20% under the same conditions.
In an embodiment of the present invention, the engine exhaust gas ozone purification system further includes an ozone amount control device for controlling an amount of ozone so as to effectively oxidize a gas component to be treated in the exhaust gas, the ozone amount control device including a control unit.
In an embodiment of the invention, the ozone amount control device further includes an ozone pre-treatment tail gas component detection unit for detecting the ozone pre-treatment tail gas component content.
In an embodiment of the present invention, the control unit controls the amount of ozone required for the mixing reaction according to the content of the components of the tail gas before the ozone treatment.
In an embodiment of the invention, the detection unit of the exhaust gas component before ozone treatment is selected from at least one of the following detection units:
The first volatile organic compound detection unit is used for detecting the content of volatile organic compounds in the tail gas before ozone treatment, such as a volatile organic compound sensor and the like;
the first CO detection unit is used for detecting the content of CO in the tail gas before ozone treatment, such as a CO sensor and the like;
a first nitrogen oxide detecting unit for detecting the content of nitrogen oxides, such as nitrogen oxides (NO x ) A sensor, etc.
In an embodiment of the present invention, the control unit controls the amount of ozone required for the mixing reaction according to the output value of at least one of the pre-ozone-treatment tail gas component detection units.
In an embodiment of the present invention, the control unit is configured to control the amount of ozone required for the mixing reaction according to a preset mathematical model. The preset mathematical model is related to the content of the tail gas components before ozone treatment, the amount of ozone required by the mixing reaction is determined according to the content and the reaction mole ratio of the tail gas components to ozone, and the amount of ozone can be increased when the amount of ozone required by the mixing reaction is determined, so that the ozone is excessive.
In one embodiment of the present invention, the control unit is configured to control the amount of ozone required for the mixing reaction according to the theoretical estimated value.
In an embodiment of the present invention, the theoretical estimated value is: the molar ratio of the ozone inlet amount to the substances to be treated in the tail gas is 2-10. For example: the 13L diesel engine can control the ozone inlet amount to be 300-500 g; the ozone inlet amount of the 2L gasoline engine can be controlled to be 5-20 g.
In an embodiment of the invention, the ozone amount control device includes an ozone post-treatment tail gas component detection unit for detecting the ozone post-treatment tail gas component content.
In an embodiment of the present invention, the control unit controls the amount of ozone required for the mixing reaction according to the content of the components of the tail gas after the ozone treatment.
In an embodiment of the invention, the ozone-treated tail gas component detecting unit is at least one of the following detecting units:
the first ozone detection unit is used for detecting the ozone content in the tail gas after ozone treatment;
the second volatile organic compound detection unit is used for detecting the content of volatile organic compounds in the tail gas after ozone treatment;
the second CO detection unit is used for detecting the content of CO in the tail gas after ozone treatment;
the second nitrogen oxide detection unit is used for detecting the nitrogen oxide content in the tail gas after ozone treatment.
In an embodiment of the present invention, the control unit controls the ozone amount according to an output value of at least one of the ozone-treated tail gas component detecting units.
In an embodiment of the invention, the engine exhaust ozone purification system further includes a denitration device for removing nitric acid in a mixed reaction product of the ozone stream and the exhaust stream.
In an embodiment of the present invention, the denitration device includes an electrocoagulation device, and the electrocoagulation device includes: the electric coagulation flow channel, the first electrode that is arranged in the electric coagulation flow channel, the second electrode.
In an embodiment of the invention, the denitration device includes a condensation unit, configured to condense the tail gas after ozone treatment, so as to implement gas-liquid separation.
In an embodiment of the present invention, the denitration device includes a leaching unit, configured to leach the tail gas after ozone treatment, for example: water and/or alkali.
In an embodiment of the invention, the denitration device further includes a leaching solution unit for providing leaching solution to the leaching unit.
In one embodiment of the invention, the eluent in the eluent unit comprises water and/or alkali.
In an embodiment of the invention, the denitration device further includes a denitration liquid collection unit, which is used for storing the nitric acid aqueous solution and/or the nitric acid aqueous solution removed from the tail gas.
In one embodiment of the present invention, when the aqueous solution of nitric acid is stored in the denitration liquid collection unit, the denitration liquid collection unit is provided with an alkali liquor addition unit for forming nitrate with nitric acid.
In an embodiment of the invention, the engine exhaust gas ozone purification system further includes an ozone digestion device for digesting ozone in the exhaust gas treated by the reaction field. The ozone digestion device can perform ozone digestion in ultraviolet rays, catalysis and other modes.
In an embodiment of the present invention, the ozone digestion device is at least one selected from the group consisting of an ultraviolet ozone digestion device and a catalytic ozone digestion device.
In an embodiment of the present invention, the engine exhaust ozone purification system further includes a first denitration device, configured to remove nitrogen oxides in exhaust gas; the reaction field is used for mixing and reacting the tail gas treated by the first denitration device with an ozone stream, or mixing and reacting the tail gas with the ozone stream before the tail gas is treated by the first denitration device.
The first denitration device may be a device for implementing denitration in the prior art, for example: at least one of a non-catalytic reduction device (such as ammonia gas denitration), a selective catalytic reduction device (SCR: ammonia gas plus catalyst denitration), a non-selective catalytic reduction device (SNCR), an electron beam denitration device and the like. The first denitration device is used for treating Nitrogen Oxides (NO) in tail gas of the engine after treatment x ) The content does not reach the standard, and the mixed reaction of the tail gas and the ozone flow after or before the treatment of the first denitration device can reach the latest standard.
In an embodiment of the invention, the first denitration device is at least one selected from a non-catalytic reduction device, a selective catalytic reduction device, a non-selective catalytic reduction device and an electron beam denitration device.
Based on the prior art, the person skilled in the art considers: ozone treatment of nitrogen oxides NO in engine tail gas X Nitrogen oxides NO X Oxidized by ozone to higher nitrogen oxides such as NO 2 、N 2 O 5 And NO 3 Etc., said higher nitrogen oxides, also being gases, are still not removed from the engine exhaust, i.e. ozone treats the nitrogen oxides NO in the engine exhaust X The inventors have found that the reaction of ozone with nitrogen oxides in the exhaust gas produces higher nitrogen oxides that are not the final product, and that the higher nitrogen oxides react with water to produce nitric acid which is more easily removed from the engine exhaust gas, such as byThis effect is unexpected to those skilled in the art with electrocoagulation and condensation. This unexpected technical effect is because one skilled in the art does not recognize that ozone can also react with VOCs in engine exhaust to produce sufficient water and higher nitrogen oxides to produce nitric acid.
When ozone is used to treat engine exhaust, the ozone reacts with Volatile Organic Compounds (VOCs) most preferentially and is oxidized to CO 2 And water, then with oxynitride NO X Oxidized to higher nitrogen oxides such as NO 2 、N 2 O 5 And NO 3 And finally, react with CO to be oxidized into CO 2 That is, the reaction priority is that the volatile organic compound VOC > oxynitride NO X Carbon monoxide CO and sufficient volatile organic compounds VOC in the exhaust gas to produce sufficient water to react sufficiently with higher nitrogen oxides to form nitric acid, thus treating engine exhaust gas with ozone to remove NO by ozone X Better results, which are unexpected technical results to those skilled in the art.
The following removal effect can be achieved by ozone treatment of engine tail gas: nitrogen oxides NO X Removal efficiency: 60 to 99.97 percent; carbon monoxide CO removal efficiency: 1-50%; efficiency of VOC removal by volatile organic compounds: 60 to 99.97%, which is an unexpected technical effect to those skilled in the art.
The nitric acid obtained by the reaction of the high-valence nitrogen oxides and the water obtained by oxidizing the volatile organic compounds VOC is easier to remove, and the nitric acid obtained by removal can be recycled, for example, the nitric acid can be removed by the electrocoagulation device of the invention, and the nitric acid can be removed by a method for removing nitric acid in the prior art, such as alkali elution. The electric coagulation device comprises a first electrode and a second electrode, when the nitric acid-containing water mist flows through the first electrode, the nitric acid-containing water mist is electrified, the second electrode applies attractive force to the electrified nitric acid-containing water mist, the nitric acid-containing water mist moves to the second electrode until the nitric acid-containing water mist is attached to the second electrode, and then the nitric acid-containing water mist is collected.
An exhaust gas ozone purification method, comprising the following steps: mixing the ozone stream with the tail gas stream for reaction.
In one embodiment of the invention, the tail gas stream includes nitrogen oxides and volatile organic compounds. The exhaust stream may be engine exhaust, which is typically a device for converting chemical energy of a fuel into mechanical energy, in particular an internal combustion engine or the like, more in particular e.g. diesel engine exhaust or the like. Nitrogen Oxides (NO) in the exhaust gas stream x ) Mixing with ozone stream, oxidizing into high-valence nitrogen oxides such as NO 2 、N 2 O 5 And NO 3 Etc. The Volatile Organic Compounds (VOCs) in the tail gas stream are mixed with the ozone stream to react and oxidize to CO 2 And water. The high-valence nitrogen oxides react with water obtained by oxidizing Volatile Organic Compounds (VOCs) to obtain nitric acid. Through the above reaction, nitrogen oxides (NO x ) Is removed and exists in the form of nitric acid in the waste gas.
In one embodiment of the invention, the ozone stream is mixed with the tail gas stream at the low temperature section of the tail gas.
In one embodiment of the invention, the mixing reaction temperature of the ozone stream and the tail gas stream is-50-200deg.C, which can be 60-70deg.C, 50-80deg.C, 40-90deg.C, 30-100deg.C, 20-110deg.C, 10-120deg.C, 0-130deg.C, -10-140deg.C, -20-150deg.C, -30-160deg.C, -40-170deg.C, -50-180deg.C, -180-190deg.C or 190-200deg.C.
In one embodiment of the invention, the mixing reaction temperature of the ozone stream and the tail gas stream is 60-70 ℃.
In one embodiment of the present invention, the ozone stream and the tail gas stream are mixed in at least one selected from the group consisting of venturi mixing, positive pressure mixing, insert mixing, dynamic mixing, and fluid mixing.
In an embodiment of the present invention, when the ozone stream and the tail gas stream are mixed in a positive pressure, the pressure of the ozone intake is greater than the pressure of the tail gas. When the pressure of the ozone stream inlet air is less than the exhaust pressure of the exhaust stream, a venturi mixing mode can be used simultaneously.
In one embodiment of the invention, the flow rate of the tail gas stream is increased and the venturi principle is used to mix the ozone stream before the ozone stream is mixed with the tail gas stream.
In one embodiment of the present invention, the mixing mode of the ozone stream and the tail gas stream is at least one selected from the group consisting of reverse flow inlet of the tail gas outlet, mixing in the front section of the reaction field, front and rear insertion of the dust remover, front and rear mixing in the denitration device, front and rear mixing in the catalytic device, front and rear inlet of the washing device, front and rear mixing in the filtering device, front and rear mixing in the muffler device, mixing in the tail gas pipeline, external mixing in the adsorption device and front and rear mixing in the condensation device. Can be arranged at the low temperature section of the tail gas of the engine to avoid the digestion of ozone.
In one embodiment of the invention, the reaction field for the mixed reaction of the ozone stream and the tail gas stream comprises a pipe and/or a reactor.
In an embodiment of the invention, the reaction field comprises an exhaust pipe, a heat accumulator device or a catalyst.
In an embodiment of the present invention, at least one of the following technical features is further included:
1) The diameter of the pipeline is 100-200 mm;
2) The length of the pipeline is 0.1 times greater than the diameter of the pipeline;
3) The reactor is selected from at least one of the following:
reactor one: the reactor is provided with a reaction chamber, and tail gas and ozone are mixed and reacted in the reaction chamber;
and (2) a second reactor: the reactor comprises a plurality of honeycomb cavities for providing a space for mixing and reacting tail gas and ozone; a gap is arranged between the honeycomb cavities and is used for introducing a cold medium to control the reaction temperature of tail gas and ozone;
and (3) a third reactor: the reactor comprises a plurality of carrier units, wherein the carrier units provide a reaction field (such as a mesoporous ceramic body carrier with a honeycomb structure), the reaction is carried out in a gas phase when the carrier units are not provided, and the reaction time is accelerated when the carrier units are provided;
and a fourth reactor: the reactor comprises a catalyst unit for promoting the oxidation reaction of the tail gas;
4) The reaction field is provided with an ozone inlet, and the ozone inlet is at least one selected from a nozzle, a spray grid, a nozzle, a cyclone nozzle and a nozzle provided with a venturi tube; spout provided with venturi: the venturi tube is arranged in the nozzle, and ozone is mixed in by adopting a venturi principle;
5) The reaction field is provided with an ozone inlet, ozone enters the reaction field through the ozone inlet to be contacted with tail gas, and the arrangement of the ozone inlet forms at least one of the following directions: opposite to the flow direction of the tail gas, perpendicular to the flow direction of the tail gas, tangential to the flow direction of the tail gas, inserted into the flow direction of the tail gas, and contacted with the tail gas in multiple directions; the flow direction of the tail gas is opposite to the flow direction of the tail gas, namely, the tail gas enters in the opposite direction, so that the reaction time is increased, and the volume is reduced; the flow direction of the tail gas is vertical, and the Venturi effect is used; tangential to the flow direction of the tail gas, so that the mixing is convenient; the tail gas flow direction is inserted, so that the swirling flow is overcome; in multiple directions, against gravity.
In one embodiment of the invention, the ozone stream is provided by a storage ozone unit and/or an ozone generator.
In an embodiment of the present invention, the ozone generator includes one or more of a surface-extended discharge ozone generator, a power frequency arc ozone generator, a high frequency induction ozone generator, a low pressure ozone generator, an ultraviolet ozone generator, an electrolyte ozone generator, a chemical agent ozone generator, and a radiation particle generator.
In one embodiment of the invention, the ozone stream providing method comprises: under the action of the electric field and the oxidation catalytic bond cleavage selective catalyst layer, the gas containing oxygen generates ozone, wherein the oxidation catalytic bond cleavage selective catalyst layer is supported on the electrode forming the electric field.
In an embodiment of the present invention, the electrode includes a high voltage electrode or an electrode provided with a blocking dielectric layer, when the electrode includes a high voltage electrode, the oxidation-catalyst bond cleavage-selective catalyst layer is supported on a surface of the high voltage electrode, and when the electrode includes a high voltage electrode of a blocking dielectric layer, the oxidation-catalyst bond cleavage-selective catalyst layer is supported on a surface of the blocking dielectric layer.
In an embodiment of the present invention, when the electrode includes a high voltage electrode, the thickness of the oxidation-catalyzed bond-cracking selective catalyst layer is 1 to 3mm, and the oxidation-catalyzed bond-cracking selective catalyst layer also serves as a blocking medium, such as 1 to 1.5mm or 1.5 to 3mm; when the electrode comprises a high voltage electrode of a barrier dielectric layer, the loading of the oxidative catalytic bond cleavage selective catalyst layer comprises 1 to 12wt%, such as 1 to 5wt% or 5 to 12wt%, of the barrier dielectric layer.
In one embodiment of the present invention, the oxidation-catalytic bond cleavage-selective catalyst layer comprises the following components in percentage by weight:
5 to 15 percent of active component, such as 5 to 8 percent, 8 to 10 percent, 10 to 12 percent, 12 to 14 percent or 14 to 15 percent;
85-95% of coating, such as 85-86%, 86-88%, 88-90%, 90-92% or 92-95%;
wherein the active component is at least one of a metal M and a compound of a metal element M, and the metal element M is at least one of an alkaline earth metal element, a transition metal element, a fourth main group metal element, a noble metal element and a lanthanide rare earth element;
the coating is selected from at least one of alumina, ceria, zirconia, manganese oxide, a metal composite oxide including a composite oxide of one or more metals of aluminum, cerium, zirconium, and manganese, a porous material, and a layered material.
In an embodiment of the present invention, the alkaline earth metal element is at least one selected from magnesium, strontium and calcium.
In an embodiment of the present invention, the transition metal element is at least one selected from the group consisting of titanium, manganese, zinc, copper, iron, nickel, cobalt, yttrium, and zirconium.
In an embodiment of the invention, the fourth main group metal element is tin.
In an embodiment of the present invention, the noble metal element is at least one selected from the group consisting of platinum, rhodium, palladium, gold, silver and iridium.
In an embodiment of the present invention, the lanthanide rare earth element is at least one selected from lanthanum, cerium, praseodymium and samarium.
In an embodiment of the present invention, the compound of the metal element M is at least one selected from the group consisting of oxides, sulfides, sulfates, phosphates, carbonates, and perovskites.
In an embodiment of the present invention, the porous material is at least one selected from the group consisting of molecular sieves, diatomaceous earth, zeolite, and carbon nanotubes. The porosity of the porous material is more than 60%, such as 60-80%, the specific surface area is 300-500 square meters per gram, and the average pore diameter is 10-100 nanometers.
In an embodiment of the present invention, the layered material is at least one selected from graphene and graphite.
In one embodiment of the invention, the electrode is loaded with an oxygen double catalytic bond cleavage selective catalyst by dipping and/or spraying.
In one embodiment of the present invention, the method comprises the following steps:
3) According to the composition ratio of the catalyst, the slurry of the coating raw material is loaded on the surface of the high-voltage electrode or the surface of the blocking dielectric layer, and the high-voltage electrode or the blocking dielectric layer loaded with the coating is obtained through drying and calcining;
4) Loading a raw material solution or slurry containing metal elements M onto the coating obtained in the step 1) according to the composition ratio of the catalyst, drying, calcining, and setting a high-voltage electrode on the other surface of the barrier dielectric layer opposite to the loaded coating after calcining when the coating is loaded on the surface of the barrier dielectric layer, thereby obtaining the electrode for the ozone generator; or, loading a raw material solution or slurry containing metal elements M onto the coating obtained in the step 1) according to the composition ratio of the catalyst, drying, calcining and post-treating, wherein when the coating is loaded on the surface of the barrier medium layer, a high-voltage electrode is arranged on the other surface of the barrier medium layer opposite to the loaded coating after the post-treatment, and the electrode for the ozone generator is obtained;
wherein the control of the morphology of the active component in the electrode catalyst is achieved by the calcination temperature and atmosphere, and the post-treatment.
In one embodiment of the present invention, the method comprises the following steps:
3) According to the composition ratio of the catalyst, loading a raw material solution or slurry containing metal elements M on a coating raw material, drying and calcining to obtain a coating material loaded with active components;
4) Preparing the coating material loaded with the active components obtained in the step 1) into slurry according to the composition ratio of the catalyst, loading the slurry on the surface of a high-voltage electrode or the surface of a barrier dielectric layer, drying, calcining, and setting a high-voltage electrode on the other surface of the barrier dielectric layer opposite to the loaded coating after calcining when the coating is loaded on the surface of the barrier dielectric layer, thereby obtaining the electrode for the ozone generator; or preparing the coating material loaded with the active components obtained in the step 1) into slurry according to the composition ratio of the catalyst, loading the slurry on the surface of a high-voltage electrode or the surface of a barrier dielectric layer, drying, calcining and post-treating, and setting a high-voltage electrode on the other surface of the barrier dielectric layer opposite to the loading coating after the post-treating when the coating is loaded on the surface of the barrier dielectric layer, so as to obtain the electrode for the ozone generator;
Wherein the control of the morphology of the active component in the electrode catalyst is achieved by the calcination temperature and atmosphere, and the post-treatment.
The loading mode can be dipping, spraying, brushing and the like, and the loading can be realized.
When the active component includes at least one of sulfate, phosphate, and carbonate of the metal element M, a solution or slurry containing at least one of sulfate, phosphate, and carbonate of the metal element M is loaded on the coating raw material, and dried, calcined, and calcined at a temperature not exceeding the decomposition temperature of the active component, for example: the calcination temperature of the sulfate to obtain the metal element M cannot exceed the decomposition temperature of the sulfate (the decomposition temperature is generally 600 ℃ or higher).
The control of the morphology of the active component in the electrode catalyst is achieved by the calcination temperature and atmosphere, and the post-treatment, for example: when the active component comprises metal M, the active component can be obtained by reducing gas reduction (post-treatment) after calcination, and the calcination temperature can be 200-550 ℃; when the active component comprises sulfide of metal element M, the active component can be obtained by reacting (post-treatment) with hydrogen sulfide after calcination, and the calcination temperature can be 200-550 ℃.
In one embodiment of the present invention, the method includes: the ozone amount of the ozone stream is controlled so as to effectively oxidize the gas component to be treated in the tail gas.
In one embodiment of the present invention, the amount of ozone in the ozone stream is controlled to achieve the following removal efficiencies:
nitrogen oxide removal efficiency: 60 to 99.97 percent;
CO removal efficiency: 1-50%;
efficiency of volatile organic compound removal: 60 to 99.97 percent.
In one embodiment of the present invention, the method includes: and detecting the component content of the tail gas before ozone treatment.
In one embodiment of the invention, the amount of ozone required for the mixing reaction is controlled according to the content of the components of the tail gas before ozone treatment.
In one embodiment of the present invention, the detection of the ozone pre-treatment tail gas component content is selected from at least one of the following:
detecting the content of volatile organic compounds in the tail gas before ozone treatment;
detecting the content of CO in the tail gas before ozone treatment;
and detecting the content of nitrogen oxides in the tail gas before ozone treatment.
In one embodiment of the present invention, the amount of ozone required for the mixing reaction is controlled based on at least one output value that detects the level of the constituents of the exhaust gas prior to ozone treatment.
In one embodiment of the present invention, the amount of ozone required for the mixing reaction is controlled according to a predetermined mathematical model. The preset mathematical model is related to the content of the tail gas components before ozone treatment, the amount of ozone required by the mixing reaction is determined according to the content and the reaction mole ratio of the tail gas components to ozone, and the amount of ozone can be increased when the amount of ozone required by the mixing reaction is determined, so that the ozone is excessive.
In one embodiment of the invention, the amount of ozone required for the mixing reaction is controlled according to the theoretical estimate.
In an embodiment of the present invention, the theoretical estimated value is: the molar ratio of the ozone inlet amount to the objects to be treated in the tail gas is 2-10, such as 5-6, 5.5-6.5, 5-7, 4.5-7.5, 4-8, 3.5-8.5, 3-9, 2.5-9.5 and 2-10. For example: the 13L diesel engine can control the ozone inlet amount to be 300-500 g; the ozone inlet amount of the 2L gasoline engine can be controlled to be 5-20 g.
In one embodiment of the present invention, the method includes: and detecting the content of the components in the tail gas after ozone treatment.
In one embodiment of the invention, the amount of ozone required for the mixing reaction is controlled according to the content of the components of the tail gas after the ozone treatment.
In one embodiment of the present invention, the detection of the ozone treated tail gas component content is selected from at least one of the following:
detecting the ozone content in the tail gas after ozone treatment;
detecting the content of volatile organic compounds in the tail gas after ozone treatment;
detecting the content of CO in the tail gas after ozone treatment;
and detecting the content of nitrogen oxides in the tail gas after ozone treatment.
In one embodiment of the present invention, the amount of ozone is controlled based on at least one output value that detects the level of the ozone-treated tail gas component.
In an embodiment of the present invention, the exhaust gas ozone purification method further includes the steps of: nitric acid in the mixed reaction product of the ozone stream and the tail gas stream is removed.
In one embodiment of the present invention, the gas with the nitric acid mist flows through the first electrode; when the gas with the nitric acid mist flows through the first electrode, the first electrode charges the nitric acid mist in the gas, and the second electrode applies attractive force to the charged nitric acid mist, so that the nitric acid mist moves to the second electrode until the nitric acid mist is attached to the second electrode.
In one embodiment of the invention, the method for removing nitric acid from the reaction product of mixing the ozone stream with the tail gas stream comprises: the reaction product of the ozone stream and the tail gas stream are mixed and condensed.
In one embodiment of the invention, the method for removing nitric acid from the reaction product of mixing the ozone stream with the tail gas stream comprises: the reaction product of the ozone stream and the tail gas stream is mixed and leached.
In one embodiment of the present invention, the method for removing nitric acid from the reaction product of mixing the ozone stream with the tail gas stream further comprises: a rinse is provided to the mixed reaction product of the ozone stream and the tail gas stream.
In one embodiment of the invention, the rinse solution is water and/or alkali.
In one embodiment of the present invention, the method for removing nitric acid from the reaction product of mixing the ozone stream with the tail gas stream further comprises: the aqueous nitric acid and/or aqueous nitric acid solution removed from the tail gas is stored.
In one embodiment of the invention, when aqueous nitric acid is stored, an alkaline solution is added to form nitrate with nitric acid.
In an embodiment of the present invention, the exhaust gas ozone purification method further includes the steps of: ozone digestion is performed on the tail gas from which nitric acid is removed, for example: digestion may be performed by ultraviolet light, catalysis, or the like.
In an embodiment of the present invention, the ozone digestion is at least one selected from ultraviolet digestion and catalytic digestion.
In an embodiment of the present invention, the exhaust gas ozone purification method further includes the steps of: firstly removing nitrogen oxides in the tail gas; the tail gas flow after the first removal of the nitrogen oxides is mixed and reacted with the ozone flow, or the tail gas flow after the first removal of the nitrogen oxides is mixed and reacted with the ozone flow.
The first removal of nitrogen oxides from the tail gas may be a method for implementing denitration in the prior art, for example: at least one of non-catalytic reduction method (such as ammonia gas denitration), selective catalytic reduction method (SCR: ammonia gas plus catalyst denitration), non-selective catalytic reduction method (SNC R), electron beam denitration method, etc. Nitrogen Oxides (NO) in engine exhaust after first removal of nitrogen oxides in the exhaust x ) The content does not reach the standard, and the latest standard can be reached after or before the first removal of the nitrogen oxides in the tail gas through the mixing reaction with ozone. In an embodiment of the invention, the firstThe method for removing nitrogen oxides in the tail gas at one time is at least one selected from a non-catalytic reduction method, a selective catalytic reduction method, a non-selective catalytic reduction method, an electron beam denitration method and the like.
In one embodiment of the present invention, there is provided an electrocoagulation device comprising: the electric coagulation flow channel, the first electrode that is arranged in the electric coagulation flow channel, the second electrode. When the tail gas flows through the first electrode in the electric coagulation runner, the water mist containing nitric acid, namely nitric acid liquid, in the tail gas is electrified, the second electrode applies attractive force to the electrified nitric acid liquid, and the water mist containing nitric acid moves to the second electrode until the water mist containing nitric acid is attached to the second electrode, so that the nitric acid liquid in the tail gas is removed. The electrocoagulation device is also referred to as an electrocoagulation defogging device.
In an embodiment of the present invention, the first electrode may be a solid, a liquid, a gaseous molecular mass, a plasma, a conductive mixed substance, a natural mixed conductive substance of a living body, or a combination of one or more forms of the conductive substance formed by artificial processing of the object. When the first electrode is solid, the first electrode may be a solid metal, such as 304 steel, or other solid conductor, such as graphite, etc.; when the first electrode is a liquid, the first electrode may be an ion-containing conductive liquid.
In an embodiment of the present invention, the shape of the first electrode may be a dot, a line, a net, kong Banzhuang, a plate, a needle, a ball cage, a box, a tube, a natural substance, a processed substance, or the like. When the first electrode is plate-shaped, ball cage-shaped, box-shaped or tubular, the first electrode may be of a non-porous structure or of a porous structure. When the first electrode is in a porous structure, one or more front through holes may be provided on the first electrode. The shape of the front through hole in one embodiment of the present invention may be polygonal, circular, oval, square, rectangular, trapezoid, or rhombic. The size of the aperture of the front through hole in one embodiment of the present invention may be 10 to 100mm, 10 to 20mm, 20 to 30mm, 30 to 40mm, 40 to 50mm, 50 to 60mm, 60 to 70mm, 70 to 80mm, 80 to 90mm, or 90 to 100mm. In addition, the first electrode may be other shapes in other embodiments.
In one embodiment of the present invention, the shape of the second electrode may be a multi-layered mesh, net, kong Banzhuang, tube, barrel, ball cage, box, plate, granule stacked layer, bent plate, or panel. When the second electrode is plate-shaped, ball-cage-shaped, box-shaped or tubular, the second electrode may also be of a non-porous structure or of a porous structure. When the second electrode is in a porous structure, one or more rear through holes may be provided in the second electrode. In an embodiment of the present invention, the shape of the rear through hole may be polygonal, circular, oval, square, rectangular, trapezoid, or rhombic. The pore size of the rear through hole can be 10-100 mm, 10-20 mm, 20-30 mm, 30-40 mm, 40-50 mm, 50-60 mm, 60-70 mm, 70-80 mm, 80-90 mm, or 90-100 mm.
In one embodiment of the invention the second electrode is made of a conductive material. In one embodiment of the present invention, the surface of the second electrode has a conductive material.
In an embodiment of the present invention, an electric coagulation field is provided between the first electrode and the second electrode, and the electric coagulation field may be one or more of a dot surface electric field, a line surface electric field, a net surface electric field, a dot bucket electric field, a line bucket electric field, or a net bucket electric field. Such as: the first electrode is needle-shaped or linear, the second electrode is planar, and the first electrode is vertical or parallel to the second electrode, so that a linear surface electric field is formed; or the first electrode is net-shaped, the second electrode is plane-shaped, and the first electrode is parallel to the second electrode, so that a net-shaped electric field is formed; or the first electrode is in a dot shape and is fixed through a metal wire or a metal needle, the second electrode is in a barrel shape, and the first electrode is positioned at the geometric symmetry center of the second electrode, so that a dot barrel electric field is formed; or the first electrode is linear and fixed by a metal wire or a metal needle, the second electrode is barrel-shaped, and the first electrode is positioned on the geometric symmetry axis of the second electrode, so that a linear barrel electric field is formed; or the first electrode is netlike and fixed by a metal wire or a metal needle, the second electrode is barrel-shaped, and the first electrode is positioned at the geometric symmetry center of the second electrode, so that a netlike barrel electric field is formed. When the second electrode is planar, it may be planar, curved, or spherical. When the first electrode is linear, the first electrode may be linear, curved, or circular. The first electrode may also be circular-arc-shaped. When the first electrode is mesh, it may be planar, spherical or other geometric planar, rectangular, or irregular. The first electrode may be in the form of a dot, and may be a real dot with a small diameter, a small ball, or a mesh ball. When the second electrode is in a barrel shape, the second electrode can be further evolved into various box shapes. The first electrode can also be correspondingly changed to form an electrode and an electric coagulation field layer sleeve.
In one embodiment of the present invention, the first electrode is linear and the second electrode is planar. In one embodiment of the invention, the first electrode is perpendicular to the second electrode. In one embodiment of the invention, the first electrode and the second electrode are parallel. In an embodiment of the invention, the first electrode and the second electrode are both planar, and the first electrode and the second electrode are parallel. In one embodiment of the invention the first electrode is a wire mesh. In one embodiment of the present invention, the first electrode is planar or spherical. In an embodiment of the invention, the second electrode is curved or spherical. In an embodiment of the invention, the first electrode is in a dot shape, a linear shape or a net shape, the second electrode is in a barrel shape, the first electrode is positioned inside the second electrode, and the first electrode is positioned on a central symmetry axis of the second electrode.
In one embodiment of the present invention, the first electrode is electrically connected to one electrode of the power supply; the second electrode is electrically connected with the other electrode of the power supply. In one embodiment of the present invention, the first electrode is electrically connected to the cathode of the power supply, and the second electrode is electrically connected to the anode of the power supply.
Meanwhile, the first electrode of the electrocoagulation device may have a positive potential or a negative potential in some embodiments of the present invention; when the first electrode has a positive potential, the second electrode has a negative potential; when the first electrode has a negative potential, the second electrode has a positive potential, both the first electrode and the second electrode are electrically connected with the power supply, specifically the first electrode and the second electrode can be electrically connected with the positive electrode and the negative electrode of the power supply respectively. The voltage of the power supply is called a power-on driving voltage, and the magnitude of the power-on driving voltage is selected according to the ambient temperature, the medium temperature and the like. For example, the power-on driving voltage of the power supply can range from 5 to 50KV, 10 to 50KV, 5 to 10KV, 10 to 20KV, 20 to 30KV, 30 to 40KV, or 40 to 50KV, and electricity is used from bioelectricity to space haze treatment. The power source may be a dc power source or an ac power source, and the waveform of the power-on driving voltage thereof may be a dc waveform, a sine wave, or a modulated waveform. The direct current power supply is used as the basic application of adsorption; the sine wave is used as movement, and the electrified driving voltage such as the sine wave acts between the first electrode and the second electrode, so that the generated electric coagulation field drives charged particles such as fog drops and the like in the electric coagulation field to move towards the second electrode; the oblique wave is used as pulling, and the waveform is modulated according to the pulling force, for example, the two end edges of the asymmetric electric coagulation field have obvious directivity to the pulling force generated by the medium in the oblique wave, so as to drive the medium in the electric coagulation field to move along the direction. When the power supply adopts an alternating current power supply, the frequency conversion pulse range can be 0.1 Hz-5 GHz, 0.1 Hz-1 Hz, 0.5 Hz-10 Hz, 5 Hz-100 Hz, 50 Hz-1 KHz, 1 KHz-100 KHz, 50 KHz-1 MHz, 1 MHz-100 MHz, 50 MHz-1 GHz, 500 MHz-2 GHz or 1 GHz-5 GHz, and the device is suitable for adsorbing pollutant particles from organisms. The first electrode can be used as a lead, and positive and negative electrons are directly led into the water mist containing the nitric acid when the first electrode is contacted with the water mist containing the nitric acid, and the water mist containing the nitric acid can be used as the electrode. The first electrode can transfer electrons to the nitric acid-containing water mist or the electrode by means of energy fluctuation, so that the first electrode can not contact the nitric acid-containing water mist. The water mist containing nitric acid repeatedly gets electrons and loses electrons in the process of moving from the first electrode to the second electrode; at the same time, a large number of electrons are transferred between a plurality of nitric acid-containing water mist located between the first electrode and the second electrode, causing more mist droplets to become charged and eventually reach the second electrode, thereby forming an electric current, also referred to as a power-on drive current. The magnitude of the power-on driving current is related to the ambient temperature, the medium temperature, the electron quantity, the adsorbate quantity and the escape quantity. For example, as the amount of electrons increases, the number of mobile particles, such as droplets, increases, and the current formed by the mobile charged particles increases. The more charged species, such as mist, are adsorbed per unit time, the greater the current. The escaping droplets are only charged but do not reach the second electrode, i.e. no effective electrical neutralization is formed, so that under the same conditions the more droplets escape the smaller the current. Under the same conditions, the higher the ambient temperature is, the faster the gas particles and the fog drops are, the higher the kinetic energy of the gas particles and the fog drops is, the greater the collision probability of the gas particles and the fog drops with the first electrode and the second electrode is, and the gas particles and the fog drops are less likely to be adsorbed by the second electrode, so that escape is generated, but the escape is generated after electric neutralization and possibly after repeated electric neutralization, so that the electron conduction speed is correspondingly increased, and the current is correspondingly increased. Meanwhile, the higher the ambient temperature is, the higher the momentum of gas molecules, mist droplets and the like is, and the less likely the gas molecules, mist droplets and the like are adsorbed by the second electrode, and even if the second electrode is adsorbed, the greater the probability of escaping from the second electrode again, namely, escaping after electric neutralization, is, so that under the condition that the distance between the first electrode and the second electrode is unchanged, the power-on driving voltage needs to be increased, and the limit of the power-on driving voltage is that the effect of air breakdown is achieved. In addition, the effect of the medium temperature is substantially comparable to the effect of the ambient temperature. The lower the temperature of the medium, the less energy is required to excite the medium, such as mist droplets, and the smaller the kinetic energy of the medium is, the more easily the medium is absorbed on the second electrode under the action of the same electric coagulation field force, so that the formed current is larger. The electric coagulation device has better adsorption effect on cold water mist containing nitric acid. The greater the probability that a charged medium will have electron transfer with other media before colliding with the second electrode, and thus the greater the chance of effective electrical neutralization, the greater the resulting current will be; the higher the concentration of the medium, the greater the current that will be formed. The relationship between the power-on driving voltage and the medium temperature is substantially the same as the relationship between the power-on driving voltage and the ambient temperature.
In one embodiment of the present invention, the power-on driving voltage of the power source connected to the first electrode and the second electrode may be less than the initial corona onset voltage. The initial corona onset voltage is a minimum voltage value that enables a discharge to be generated between the first electrode and the second electrode and ionize the gas. The magnitude of the onset corona onset voltage may be different for different gases, different operating environments, etc. But for a person skilled in the art the corresponding initial corona onset voltage is determined for a determined gas and working environment. In one embodiment of the present invention, the power-on driving voltage of the power supply may be 0.1-2kv/mm. The power-on drive voltage of the power supply is less than the corona onset voltage of air.
In an embodiment of the invention, the first electrode and the second electrode extend along a left-right direction, and a left end of the first electrode is located at a left side of a left end of the second electrode.
In one embodiment of the present invention, there are two second electrodes, and the first electrode is located between the two second electrodes.
The distance between the first electrode and the second electrode can be set according to the power-on driving voltage, the flow rate of the water mist, the charging capability of the water mist containing nitric acid and the like. For example, the first electrode and the second electrode may have a pitch of 5 to 50mm, 5 to 10mm, 10 to 20mm, 20 to 30mm, 30 to 40mm, or 40 to 50mm. The larger the spacing between the first electrode and the second electrode, the higher the required power-on drive voltage to form a strong enough electric coagulation field for driving the charged medium to move rapidly toward the second electrode to avoid escape of the medium. Under the same conditions, the larger the distance between the first electrode and the second electrode is, the closer to the central position along the airflow direction is, and the faster the material flow rate is; the slower the flow rate of the substance closer to the second electrode; whereas, in the direction perpendicular to the air flow, charged dielectric particles, such as fog particles, increase with the distance between the first electrode and the second electrode, and are accelerated by the electric coagulation field for a longer period of time without collision, so that the moving speed of the substance in the perpendicular direction before approaching the second electrode is greater. Under the same conditions, if the electrified driving voltage is unchanged, the strength of the electric coagulation field is continuously reduced along with the increase of the distance, and the medium in the electric coagulation field is weaker in electrification capability.
The first electrode and the second electrode constitute an adsorption unit. The number of the adsorption units can be one or more, and the specific number is determined according to actual needs. In one embodiment, the adsorption unit has one. In another embodiment, the adsorption units are multiple to adsorb more nitric acid liquid by utilizing the adsorption units, so that the efficiency of collecting the nitric acid liquid is improved. When a plurality of adsorption units are provided, the distribution form of all the adsorption units can be flexibly adjusted according to the needs; all adsorption units may be the same or different. For example, all the adsorption units can be distributed along one direction or more directions of the left-right direction, the front-back direction, the oblique direction or the spiral direction so as to meet the requirements of different air volumes. All adsorption units can be distributed in a rectangular array or in a pyramid shape. The first electrode and the second electrode of the above-described various shapes can be freely combined to form an adsorption unit. For example, the first electrode is inserted into the second electrode to form an adsorption unit, and then combined with the first electrode to form a new adsorption unit, and at this time, the two first electrodes can be electrically connected; the new adsorption units are distributed in one or more of the left-right direction, up-down direction, oblique direction or spiral direction. For another example, the linear first electrode is inserted into the tubular second electrode to form an adsorption unit, and the adsorption units are distributed in one or more directions of the left-right direction, the up-down direction, the oblique direction or the spiral direction to form a new adsorption unit, and the new adsorption unit is combined with the first electrodes with various shapes to form a new adsorption unit. The distance between the first electrode and the second electrode in the adsorption unit can be adjusted at will so as to adapt to different working voltages and the requirements of the adsorption object. Different adsorption units can be combined. The different adsorption units can use the same power supply or different power supplies. When different power supplies are used, the power-on driving voltages of the power supplies may be the same or different. In addition, the number of the electrocoagulation devices may be plural, and all the electrocoagulation devices may be distributed in one or more of the left-right direction, the up-down direction, the spiral direction, and the oblique direction.
In an embodiment of the invention, the electric coagulation device further comprises an electric coagulation shell, wherein the electric coagulation shell comprises an electric coagulation inlet, an electric coagulation outlet and an electric coagulation runner, and two ends of the electric coagulation runner are respectively communicated with the electric coagulation inlet and the electric coagulation outlet. In one embodiment of the invention, the electrocoagulation inlet is circular, and the diameter of the electrocoagulation inlet is 300-1000 mm, or 500mm. In one embodiment of the invention, the electrocoagulation outlet is circular, and the diameter of the electrocoagulation outlet is 300-1000 mm, or 500mm. In an embodiment of the invention, the electrocoagulation housing comprises a first housing part, a second housing part and a third housing part which are sequentially distributed from an electrocoagulation inlet to an electrocoagulation outlet, wherein the electrocoagulation inlet is positioned at one end of the first housing part, and the electrocoagulation outlet is positioned at one end of the third housing part. In an embodiment of the invention, a contour of the first housing portion gradually increases from the electrocoagulation inlet to the electrocoagulation outlet. In an embodiment of the invention, the first housing part is straight. In one embodiment of the present invention, the second housing part is straight, and the first electrode and the second electrode are mounted in the second housing part. In an embodiment of the invention, the contour of the third housing part gradually decreases from the electrocoagulation inlet to the electrocoagulation outlet. In an embodiment of the present invention, the cross sections of the first housing portion, the second housing portion, and the third housing portion are all rectangular. In one embodiment of the present invention, the electrocoagulation housing is made of stainless steel, aluminum alloy, iron alloy, cloth, sponge, molecular sieve, activated carbon, foam iron, or foam silicon carbide. In one embodiment of the invention the first electrode is connected to the electrocoagulation housing via an electrocoagulation insulator. In an embodiment of the present invention, the material of the electrocoagulation insulating member is insulating mica. In one embodiment of the invention the electrocoagulation insulator is cylindrical or tower-shaped. In one embodiment of the present invention, a cylindrical front connection portion is disposed on the first electrode, and the front connection portion is fixedly connected with the electrocoagulation insulating member. In one embodiment of the present invention, a cylindrical rear connection portion is disposed on the second electrode, and the rear connection portion is fixedly connected with the electrocoagulation insulating member.
In one embodiment of the invention, the first electrode is located in the electrocoagulation channel. In one embodiment of the invention, the ratio of the cross-sectional area of the first electrode to the cross-sectional area of the electrocoagulation channel is 99% to 10%, or 90% to 10%, or 80% to 20%, or 70% to 30%, or 60% to 40%, or 50%. The cross-sectional area of the first electrode refers to the sum of the areas of the first electrode along the solid portion of the cross-section.
In the process of collecting the water mist containing the nitric acid, the water mist containing the nitric acid enters the electrocoagulation shell from the electrocoagulation inlet and moves towards the electrocoagulation outlet; during the movement of the nitric acid-containing water mist towards the electrocoagulation outlet, the nitric acid-containing water mist will pass through the first electrode and be charged; the second electrode adsorbs the charged nitric acid-containing water mist to collect the nitric acid-containing water mist on the second electrode. The invention uses the electrocoagulation shell to guide tail gas and water mist containing nitric acid to flow through the first electrode, so that the first electrode is used for electrifying the water mist of nitric acid, and the second electrode is used for collecting the water mist of nitric acid, thereby effectively reducing the water mist of nitric acid flowing out from the electrocoagulation outlet. In some embodiments of the present invention, the material of the electrocoagulation housing may be metal, nonmetal, conductor, nonconductor, water, various conductive liquids, various porous materials, or various foam materials. When the material of the electrocoagulation housing is metal, the material may specifically be stainless steel, aluminum alloy, or the like. When the material of the electrocoagulation shell is nonmetal, the material of the electrocoagulation shell can be cloth, sponge or the like. When the material of the electrocoagulation housing is a conductor, the material may specifically be an iron alloy or the like. When the material of the electrocoagulation shell is non-conductor, water layer is formed on the surface of the electrocoagulation shell to form an electrode, such as a sand layer after water absorption. When the material of the electrocoagulation shell is water and various conductive liquids, the electrocoagulation shell is static or flowing. When the material of the electrocoagulation shell is various porous materials, the material of the electrocoagulation shell can be molecular sieve or activated carbon. When the material of the electrocoagulation shell is various foam materials, the material can be foam iron, foam silicon carbide and the like. In one embodiment, the first electrode is fixedly connected with the electro-coagulation casing through an electro-coagulation insulating member, and the electro-coagulation insulating member may be made of insulating mica. Meanwhile, in one embodiment, the second electrode is directly electrically connected with the electrocoagulation shell, and the connection mode enables the electrocoagulation shell to have the same electric potential with the second electrode, so that the electrocoagulation shell can absorb charged water mist containing nitric acid, and the electrocoagulation shell also forms a second electrode. The electric coagulation flow channel is arranged in the electric coagulation shell, and the first electrode is arranged in the electric coagulation flow channel.
When a mist containing nitric acid is attached to the second electrode, a condensation will form. In some embodiments of the present invention, the second electrode may extend in an up-down direction, so that when the condensation accumulated on the second electrode reaches a certain weight, the condensation will flow downward along the second electrode under the action of gravity and finally collect in a set position or device, thereby realizing recovery of the nitric acid solution attached to the second electrode. The electric coagulation device can be used for refrigerating and demisting. In addition, the substance attached to the second electrode may be collected by applying an electric field to the second electrode. The direction of collection of the material on the second electrode may be the same as the gas flow or may be different from the gas flow. In the implementation, because the gravity is fully utilized, the water drops or the water layer on the second electrode flow into the collecting tank as soon as possible; and simultaneously, the speed of the water flow on the second electrode is accelerated by utilizing the direction of the air flow and the acting force of the air flow as much as possible. Therefore, the above object can be achieved as much as possible depending on different installation conditions, and convenience, economy, feasibility, etc. of insulation, regardless of the specific direction.
In addition, the existing electrostatic field charging theory is that oxygen is ionized by corona discharge to generate a large amount of negative oxygen ions, the negative oxygen ions are in contact with dust, the dust is charged, and the charged dust is adsorbed by the heteropole. However, when a low specific resistance substance such as water mist containing nitric acid is encountered, the existing electric field adsorption effect is hardly available. Because the low specific resistance substance is easy to lose electricity after being electrified, when the moving negative oxygen ions charge the low specific resistance substance, the low specific resistance substance loses electricity quickly, and the negative oxygen ions only move once, so that the low specific resistance substance such as nitric acid-containing water mist is difficult to be electrified again after losing electricity, or the electrification mode greatly reduces the electrification probability of the low specific resistance substance, so that the whole low specific resistance substance is in an uncharged state, the heteropolar substance is difficult to continuously apply adsorption force to the low specific resistance substance, and finally the existing electric field is extremely low in adsorption efficiency to the low specific resistance substance such as nitric acid-containing water mist. According to the electric coagulation device and the electric coagulation method, instead of adopting a charging mode to charge water mist, electrons are directly transferred to the water mist containing nitric acid to charge the water mist, after a certain mist drop is charged and is de-charged, new electrons are quickly transferred to the de-charged mist drop through other mist drops by the first electrode, so that the mist drop can be quickly electrified after being de-charged, the charging probability of the mist drop is greatly increased, if repeated times, the whole mist drop is in a power-obtaining state, and the second electrode can continuously apply attractive force to the mist drop until the mist drop is adsorbed, and therefore, the collection efficiency of the electric coagulation device on the water mist containing nitric acid is ensured to be higher. The method for charging the fog drops does not need corona wires, corona poles, corona plates or the like, simplifies the whole structure of the electrocoagulation device and reduces the manufacturing cost of the electrocoagulation device. Meanwhile, by adopting the electrifying mode, a large amount of electrons on the first electrode are transferred to the second electrode through fog drops, and current is formed. When the concentration of the water mist flowing through the electric coagulation device is larger, electrons on the first electrode are more easily transferred to the second electrode through the water mist containing nitric acid, more electrons are transferred between mist drops, so that the current formed between the first electrode and the second electrode is larger, the charging probability of the mist drops is higher, and the collecting efficiency of the electric coagulation device to the water mist is higher.
In one embodiment of the present invention, there is provided an electrocoagulation defogging method comprising the steps of:
flowing a gas with water mist through the first electrode;
when the gas with the water mist flows through the first electrode, the first electrode charges the water mist in the gas, and the second electrode applies attractive force to the charged water mist to enable the water mist to move towards the second electrode until the water mist is attached to the second electrode.
In one embodiment of the invention, the first electrode directs electrons into the mist, and the electrons are transferred between droplets located between the first electrode and the second electrode, causing more droplets to become charged.
In one embodiment of the invention, electrons are conducted between the first electrode and the second electrode through the water mist, and an electric current is formed.
In one embodiment of the invention the first electrode charges the mist by contacting the mist.
In one embodiment of the invention, the first electrode charges the mist by means of energy fluctuations.
In one embodiment of the invention the mist of water attached to the second electrode forms droplets, which flow into the collecting tank.
In one embodiment of the invention, the water droplets on the second electrode flow into the collection tank under the force of gravity.
In one embodiment of the invention, the gas flows by blowing water droplets into the collection tank.
In one embodiment of the invention, the gas with the nitric acid mist flows through the first electrode; when the gas with the nitric acid mist flows through the first electrode, the first electrode charges the nitric acid mist in the gas, and the second electrode applies attractive force to the charged nitric acid mist, so that the nitric acid mist moves to the second electrode until the nitric acid mist is attached to the second electrode.
In one embodiment of the invention, the first electrode directs electrons into the nitric acid mist, and the electrons are transferred between the mist droplets between the first electrode and the second electrode, so that more mist droplets are charged.
In one embodiment of the invention, electrons are conducted between the first electrode and the second electrode through the nitric acid mist, and an electric current is formed.
In one embodiment of the invention, the first electrode charges the nitric acid mist by contacting the nitric acid mist.
In one embodiment of the present invention, the first electrode charges the nitric acid mist by means of energy fluctuation.
In one embodiment of the invention the nitric acid mist attached to the second electrode forms water droplets, which flow into the collecting tank.
In one embodiment of the invention, the water droplets on the second electrode flow into the collection tank under the force of gravity.
In one embodiment of the invention, the gas flows by blowing water droplets into the collection tank.
Example 1
An engine exhaust ozone purification system, as shown in fig. 5, comprising:
an ozone source 201 for providing an ozone stream, which is instantaneously generated by the ozone generator.
A reaction field 202 for mixing the ozone stream with the tail gas stream.
The denitration device 203 is used for removing nitric acid in the mixed reaction product of the ozone flow and the tail gas flow; the denitration device 203 comprises an electrocoagulation device 2031, and is used for electrocoagulating the engine tail gas after ozone treatment, and water mist containing nitric acid is accumulated on a second electrode in the electrocoagulation device. The denitration device 203 further comprises a denitration liquid collection unit 2032, which is used for storing the nitric acid aqueous solution and/or the nitric acid aqueous solution removed from the exhaust gas; when the denitration liquid collection unit stores the nitric acid aqueous solution, the denitration liquid collection unit is provided with an alkali liquor adding unit for forming nitrate with nitric acid.
Ozone eliminator 204 is used for eliminating ozone in the tail gas after the treatment of the reaction field. The ozone digestion device can perform ozone digestion in ultraviolet rays, catalysis and other modes.
The reaction field 202 is a second reactor, as shown in fig. 6, in which a plurality of honeycomb cavities 2021 are provided for providing a space for mixing and reacting tail gas and ozone; a gap 2022 is arranged between the honeycomb cavities and is used for introducing cold medium to control the reaction temperature of tail gas and ozone, wherein a right arrow in the figure is a refrigerant inlet, and a left arrow in the figure is a refrigerant outlet.
The electrocoagulation device comprises:
a first electrode 301 capable of conducting electrons to a water mist (low specific resistance substance) containing nitric acid; when electrons are conducted with the nitric acid-containing water mist, the nitric acid-containing water mist is charged;
the second electrode 302 is capable of applying an attractive force to the charged nitric acid-containing water mist.
In this embodiment, two first electrodes 301 are provided, and the two first electrodes 301 are both net-shaped and cage-shaped. In this embodiment, there is one second electrode 302, and the second electrode 302 is mesh-shaped and has a ball cage shape. The second electrode 302 is located between the two first electrodes 301. Meanwhile, as shown in fig. 11, the electrocoagulation device in this embodiment further includes a housing 303 having an inlet 3031 and an outlet 3032, and the first electrode 301 and the second electrode 302 are each mounted in the housing 303. And the first electrode 301 is fixedly connected with the inner wall of the housing 303 through the insulating member 304, and the second electrode 302 is directly fixedly connected with the housing 303. In this embodiment, the insulating member 304 is in a column shape, which is also called an insulating column. In this embodiment the first electrode 301 has a negative potential and the second electrode 302 has a positive potential. Meanwhile, in this embodiment, the case 303 has the same potential as the second electrode 302, and the case 303 also has an adsorption effect on the charged substance.
The electrocoagulation device in this embodiment is used for treating industrial tail gas containing acid mist. The inlet 3031 in this embodiment communicates with a port for discharging industrial exhaust gas. The working principle of the electrocoagulation device in this embodiment is as follows: industrial exhaust gas flows into the housing 303 from the inlet 3031 and out through the outlet 3032; in the process, the industrial tail gas firstly flows through one of the first electrodes 301, when the acid mist in the industrial tail gas contacts with the first electrode 301 or the distance between the first electrode 301 and the first electrode 301 reaches a certain value, the first electrode 301 transmits electrons to the acid mist, part of the acid mist is charged, the second electrode 302 applies attractive force to the charged acid mist, and the acid mist moves to the second electrode 302 and is attached to the second electrode 302; in addition, a part of acid mist is not adsorbed on the second electrode 302, the part of acid mist continuously flows towards the direction of the outlet 3032, when the part of acid mist is contacted with the other first electrode 301 or the distance between the part of acid mist and the other first electrode 301 reaches a certain value, the part of acid mist is electrified, the shell 303 applies adsorption force to the part of electrified acid mist, so that the part of electrified acid mist is attached to the inner wall of the shell 303, the emission amount of acid mist in industrial tail gas is greatly reduced, and the treatment device in the embodiment can remove 90% of acid mist in the industrial tail gas, so that the acid mist removing effect is very remarkable. In addition, in this embodiment, the inlet 3031 and the outlet 3032 are both circular, and the inlet 3031 may be referred to as an air inlet and the outlet 3032 may be referred to as an air outlet.
Example 2
As shown in fig. 7, the engine exhaust gas ozone purification system in embodiment 1 further includes an ozone amount control device 209 for controlling an amount of ozone so as to effectively oxidize a gas component to be treated in the exhaust gas, the ozone amount control device 209 including a control unit 2091. The ozone amount control device 209 further includes a pre-ozone treatment tail gas component detection unit 2092 for detecting the pre-ozone treatment tail gas component content. The control unit controls the amount of ozone required by the mixing reaction according to the content of the tail gas components before ozone treatment.
The exhaust gas component detection unit before ozone treatment is selected from at least one of the following detection units:
a first voc detection unit 20921 for detecting the content of the voc in the tail gas before ozone treatment, such as a voc sensor;
a first CO detection unit 20922 for detecting the CO content in the tail gas before ozone treatment, such as a CO sensor;
a first nox detection unit 20923 for detecting the content of nox, such as nox (NO x ) A sensor, etc.
The control unit controls the amount of ozone required by the mixing reaction according to the output value of at least one of the tail gas component detection units before ozone treatment.
The control unit is used for controlling the amount of ozone required by the mixing reaction according to the theoretical estimated value. The theoretical estimated value is: the molar ratio of the ozone inlet amount to the substances to be treated in the tail gas is 2-10.
The ozone amount control device includes an ozone post-treatment tail gas component detection unit 2093 for detecting the ozone post-treatment tail gas component content. And the control unit controls the amount of ozone required by the mixing reaction according to the content of the tail gas components after the ozone treatment.
The exhaust gas component detection unit after ozone treatment is at least one of the following detection units:
a first ozone detecting unit 20931 for detecting the ozone content in the tail gas after ozone treatment;
the second volatile organic compound detection unit 20932 is used for detecting the content of volatile organic compounds in the tail gas after ozone treatment:
the second CO detection unit 20933 is used for detecting the content of CO in the tail gas after ozone treatment;
the second nitrogen oxide detecting unit 20934 is configured to detect the nitrogen oxide content in the tail gas after ozone treatment.
The control unit controls the ozone amount according to the output value of at least one of the ozone-treated tail gas component detection units.
Example 3
Preparation of an electrode for an ozone generator:
taking an alpha-alumina plate with the length of 300mm, the width of 30mm and the thickness of 1.5mm as a blocking dielectric layer;
The catalyst (containing a coating and an active component) is coated on one surface of the blocking dielectric layer, and after the catalyst is coated, the catalyst is 12% of the mass of the blocking dielectric layer, and comprises the following components in percentage by weight: the active component is 12wt% and the coating is 88wt%, wherein the active component is cerium oxide and zirconium oxide (the mass ratio of the substances is 1:1.3 in sequence), and the coating is gama aluminum oxide;
and (3) attaching copper foil to the other surface of the catalyst-coated barrier dielectric layer to prepare the electrode.
Wherein, the catalyst coating method is as follows:
(1) 200g of 800-mesh gama alumina powder, 5g of cerium nitrate, 4g of zirconium nitrate, 4g of oxalic acid, 5g of pseudo-boehmite, 1g of aluminum nitrate and 0.5g of EDTA (for decomposition) are taken and poured into an agate mill. 1300g of deionized water was then added. Grinding at 200rpm/min for 10 hours. Preparing slurry;
(2) And putting the barrier dielectric layer into an oven to be dried for 2 hours at 150 ℃, and opening an oven fan during drying. Then cooling to room temperature under the condition that the oven door is kept closed;
(3) And loading the catalyst slurry into a high-pressure spray gun, and uniformly spraying the catalyst slurry onto the surface of the dried barrier medium layer. Putting into a vacuum dryer, and drying in the shade for 2 hours;
(4) Drying in the shade, heating to 550 ℃ in a muffle furnace at a heating rate of 5 ℃ per minute. Keeping the temperature constant for two hours, and naturally cooling to room temperature under the condition of keeping the furnace door closed. The coating process is completed.
In the same manner, 4 electrodes were prepared. Taking XF-B-3-100 ozone generator of Henan Dino environmental protection technology Co., ltd, and fully replacing 4 electrodes therein with the prepared electrodes. Performing a comparison test, wherein the test conditions are as follows: the pure oxygen source has an air inlet pressure of 0.6MPa, an air inlet quantity of 1.5 cubic meters per hour, an alternating current voltage and a sine wave of 5000V and 2 ten thousand hertz. The ozone generation amount per hour is calculated through the detection results of the air outlet quantity and the mass concentration.
The experimental results are as follows:
the production amount of XF-B-3-100 raw ozone is 120 g/h; after the electrode was replaced, the ozone generation amount was 160 g/hr under the same test conditions. Under experimental conditions, the power loss was 830W.
Example 4
Preparation of an electrode for an ozone generator:
taking an alpha-alumina plate with the length of 300mm, the width of 30mm and the thickness of 1.5mm as a blocking dielectric layer;
the catalyst (containing a coating and an active component) is coated on one surface of the blocking dielectric layer, after the catalyst is coated, the catalyst accounts for 5% of the mass of the blocking dielectric layer, and the catalyst comprises the following components in percentage by weight: the active component accounts for 15wt% of the total weight of the catalyst, and the coating is 85%, wherein the active component is MnO and CuO, and the coating is gama alumina;
And (3) attaching copper foil to the other surface of the catalyst-coated barrier dielectric layer to prepare the electrode.
Wherein, the catalyst coating method is as follows:
(1) 200g of 800-mesh gama alumina powder, 4g of oxalic acid, 5g of pseudo-boehmite, 1g of aluminum nitrate and 0.5g of surfactant (for decomposition) are taken and poured into an agate mill. 1300g of deionized water was then added. Grinding at 200rpm/min for 10 hours. Preparing slurry;
(2) And putting the barrier dielectric layer into an oven to be dried for 2 hours at 150 ℃, and opening an oven fan during drying. And then cooling to room temperature under the condition that the oven door is kept closed. Measuring the water absorption amount (A) of the blocking dielectric layer by measuring the mass change before and after drying;
(3) And loading the slurry into a high-pressure spray gun, and uniformly spraying the slurry onto the surface of the dried barrier medium layer. Putting into a vacuum dryer, and drying in the shade for 2 hours;
(4) Drying in the shade, heating to 550 ℃ in a muffle furnace at a heating rate of 5 ℃ per minute. Keeping the temperature constant for two hours, and naturally cooling to room temperature under the condition of keeping the furnace door closed. And (5) weighing.
(5) And immersing the barrier medium layer loaded with the coating in water for 1 minute, taking out, blowing off surface floating water, and weighing. Calculating to obtain the water absorption capacity (B) of the water purifier;
(6) The net water uptake C (c=b-ase:Sub>A) of the coating was calculated. And calculating the concentration of the active component aqueous solution according to the target load of the active component and the net water absorption capacity C of the coating. Preparing an active component solution by using the method; (target active component loading CuO0.1g; mnO0.2 g)
(7) And (3) drying the barrier dielectric layer loaded with the coating for 2 hours at 150 ℃, and cooling to room temperature under the condition that the oven door is kept closed. The surface without active component is waterproof and protected.
(8) And (3) taking the prepared active component solution (copper nitrate and manganese nitrate) in the step (6), loading the active component solution into the coating by an impregnation method, and blowing off the surface floating liquid. Oven-drying at 150deg.C for 2 hr. And (5) transferring the mixture into a muffle furnace for roasting. Heated to 550℃at 15℃per minute and kept at constant temperature for 3 hours. The furnace door is opened slightly, and the furnace door is cooled to the room temperature. The coating process is completed.
In the same manner, 4 electrodes were prepared. Taking XF-B-3-100 ozone generator of Henan Dino environmental protection technology Co., ltd, and fully replacing 4 electrodes therein with the prepared electrodes. Performing a comparison test, wherein the test conditions are as follows: the pure oxygen source has an air inlet pressure of 0.6MPa, an air inlet quantity of 1.5 cubic meters per hour, an alternating current voltage and a sine wave of 5000V and 2 ten thousand hertz. The ozone generation amount per hour is calculated through the detection results of the air outlet quantity and the mass concentration.
The experimental results are as follows:
the production amount of XF-B-3-100 raw ozone is 120 g/h; after the electrode was replaced, the ozone generation amount was 168 g/hr under the same test conditions. Under experimental conditions, the power loss was 830W.
Example 5
Preparation of an electrode for an ozone generator:
taking a quartz glass plate with the length of 300mm, the width of 30mm and the thickness of 1.5mm as a blocking medium layer;
the catalyst (containing a coating and an active component) is coated on one surface of the blocking dielectric layer, and after the catalyst is coated, the catalyst accounts for 1% of the mass of the blocking dielectric layer, and comprises the following components in percentage by weight: the active component is 5wt% and the coating is 95wt%, wherein the active component is silver, rhodium, platinum, cobalt and lanthanum (the weight ratio of the substances is 1:1:1:2:1.5 in sequence), and the coating is zirconia;
and (3) attaching copper foil to the other surface of the catalyst-coated barrier dielectric layer to prepare the electrode.
Wherein, the catalyst coating method is as follows:
(1) 400g of zirconia, 1.7g of silver nitrate, 2.89g of rhodium nitrate, 3.19g of platinum nitrate, 4.37g of cobalt nitrate, 8.66g of lanthanum nitrate, 15g of oxalic acid and 25g of EDTA (for decomposition) were taken and poured into an agate mill. 1500g of deionized water was then added. Grinding at 200rpm/min for 10 hours. Preparing slurry;
(2) And putting the barrier dielectric layer into an oven to be dried for 2 hours at 150 ℃, and opening an oven fan during drying. Then cooling to room temperature under the condition that the oven door is kept closed;
(3) And loading the catalyst slurry into a high-pressure spray gun, and uniformly spraying the catalyst slurry onto the surface of the dried barrier medium layer. Putting into a vacuum dryer, and drying in the shade for 2 hours;
(4) Drying in the shade, heating to 550 ℃ in a muffle furnace at a heating rate of 5 ℃ per minute. Keeping the temperature constant for two hours, and naturally cooling to room temperature under the condition that the furnace door is kept closed; the reduction was then carried out at 220℃under a hydrogen reducing atmosphere for 1.5 hours. The coating process is completed.
In the same manner, 4 electrodes were prepared. Taking XF-B-3-100 ozone generator of Henan Dino environmental protection technology Co., ltd, and fully replacing 4 electrodes therein with the prepared electrodes. Performing a comparison test, wherein the test conditions are as follows: the pure oxygen source has an air inlet pressure of 0.6MPa, an air inlet quantity of 1.5 cubic meters per hour, an alternating current voltage and a sine wave of 5000V and 2 ten thousand hertz. The ozone generation amount per hour is calculated through the detection results of the air outlet quantity and the mass concentration.
The experimental results are as follows:
the production amount of XF-B-3-100 raw ozone is 120 g/h; after the electrode was replaced, the ozone generation amount was 140 g/hr under the same test conditions. Under experimental conditions, the power loss was 830W.
Example 6
Preparation of an electrode for an ozone generator:
the catalyst (containing a coating and an active component) is coated on one side of a copper foil (electrode), the thickness of the catalyst is 1.5mm after the catalyst is coated, and the catalyst comprises the following components in percentage by weight: the active component is 8wt% and the coating is 92wt%, wherein the active component is zinc sulfate, calcium sulfate, titanium sulfate and magnesium sulfate (the weight ratio of the substances is 1:2:1:1 in sequence), and the coating is graphene.
Wherein, the catalyst coating method is as follows:
(1) 100g of graphene, 1.61g of zinc sulfate, 3.44g of calcium sulfate, 2.39g of titanium sulfate, 1.20g of magnesium sulfate, 25g of oxalic acid and 15g of EDTA (for decomposition) are taken and poured into an agate mill. 800g of deionized water was added. Grinding at 200rpm/min for 10 hours. Preparing slurry;
(2) The catalyst slurry was charged into a high-pressure spray gun and uniformly sprayed onto the surface of a copper foil (electrode). Putting into a vacuum dryer, and drying in the shade for 2 hours;
(3) Drying in the shade, heating to 350 deg.C in a muffle furnace at a heating rate of 5 deg.C per minute. Keeping the temperature constant for two hours, and naturally cooling to room temperature under the condition of keeping the furnace door closed.
In the same manner, 4 electrodes were prepared. Taking XF-B-3-100 ozone generator of Henan Dino environmental protection technology Co., ltd, and fully replacing 4 electrodes therein with the prepared electrodes. Performing a comparison test, wherein the test conditions are as follows: the pure oxygen source has an air inlet pressure of 0.6MPa, an air inlet quantity of 1.5 cubic meters per hour, an alternating current voltage and a sine wave of 5000V and 2 ten thousand hertz. The ozone generation amount per hour is calculated through the detection results of the air outlet quantity and the mass concentration.
The experimental results are as follows:
the production amount of XF-B-3-100 raw ozone is 120 g/h; after the electrode was replaced, the ozone generation amount was 165 g/hr under the same test conditions. Under experimental conditions, the power loss was 830W.
Example 7
Preparation of an electrode for an ozone generator:
the catalyst (containing a coating and an active component) is coated on one side of a copper foil (electrode), the thickness of the catalyst is 3mm after the catalyst is coated, and the catalyst comprises the following components in percentage by weight: the coating comprises 10wt% of active components and 90wt% of coating, wherein the active components are praseodymium oxide, samarium oxide and yttrium oxide (the weight ratio of substances is 1:1:1 in sequence), and the coating is cerium oxide and manganese oxide (the weight ratio of substances is 1:1 in sequence).
Wherein, the catalyst coating method is as follows:
(1) 62.54g of cerium oxide, 31.59g of manganese oxide, 3.27g of praseodymium nitrate, 3.36g of samarium nitrate, 3.83g of yttrium nitrate, 12g of oxalic acid and 20g of EDTA (for decomposition) were taken and poured into an agate mill. 800g of deionized water was added. Grinding at 200rpm/min for 10 hours. Preparing slurry;
(2) The catalyst slurry was charged into a high-pressure spray gun and uniformly sprayed onto the surface of a copper foil (electrode). Putting into a vacuum dryer, and drying in the shade for 2 hours;
(3) Drying in the shade, heating to 500 ℃ in a muffle furnace at a heating rate of 5 ℃ per minute. Keeping the temperature constant for two hours, and naturally cooling to room temperature under the condition of keeping the furnace door closed.
In the same manner, 4 electrodes were prepared. Taking XF-B-3-100 ozone generator of Henan Dino environmental protection technology Co., ltd, and fully replacing 4 electrodes therein with the prepared electrodes. Performing a comparison test, wherein the test conditions are as follows: the pure oxygen source has an air inlet pressure of 0.6MPa, an air inlet quantity of 1.5 cubic meters per hour, an alternating current voltage and a sine wave of 5000V and 2 ten thousand hertz. The ozone generation amount per hour is calculated through the detection results of the air outlet quantity and the mass concentration.
The experimental results are as follows:
the production amount of XF-B-3-100 raw ozone is 120 g/h; after the electrode was replaced, the ozone generation amount was 155 g/hr under the same test conditions. Under experimental conditions, the power loss was 830W.
Example 8
Preparation of an electrode for an ozone generator:
the catalyst (containing a coating and an active component) is coated on one side of a copper foil (electrode), the thickness of the catalyst is 1mm after the catalyst is coated, and the catalyst comprises the following components in percentage by weight: the active component is 14wt%, the coating is 86wt%, wherein the active component is strontium sulfide, nickel sulfide, tin sulfide and iron sulfide (the weight ratio of the substances is 2:1:1:1 in sequence), the coating is diatomite, the porosity is 80%, the specific surface area is 350 square meters per gram, and the average pore diameter is 30 nanometers.
Wherein, the catalyst coating method is as follows:
(1) 58g of diatomaceous earth, 3.66g of strontium sulfate, 2.63g of nickel sulfate, 2.18g of stannous sulfate, 2.78g of ferrous sulfate, 3g of oxalic acid, 5g of EDTA (for decomposition) were taken and poured into an agate mill. 400g of deionized water was added. Grinding at 200rpm/min for 10 hours. Preparing slurry;
(2) The catalyst slurry was charged into a high-pressure spray gun and uniformly sprayed onto the surface of a copper foil (electrode). Putting into a vacuum dryer, and drying in the shade for 2 hours;
(3) Drying in the shade, heating to 500 ℃ in a muffle furnace at a heating rate of 5 ℃ per minute. Keeping the temperature constant for two hours, and naturally cooling to room temperature under the condition that the furnace door is kept closed; and then introducing CO for vulcanization reaction, and finishing the coating process.
In the same manner, 4 electrodes were prepared. Taking XF-B-3-100 ozone generator of Henan Dino environmental protection technology Co., ltd, and fully replacing 4 electrodes therein with the prepared electrodes. Performing a comparison test, wherein the test conditions are as follows: the pure oxygen source has an air inlet pressure of 0.6MPa, an air inlet quantity of 1.5 cubic meters per hour, an alternating current voltage and a sine wave of 5000V and 2 ten thousand hertz. The ozone generation amount per hour is calculated through the detection results of the air outlet quantity and the mass concentration.
The experimental results are as follows:
the production amount of XF-B-3-100 raw ozone is 120 g/h; after the electrode was replaced, the ozone generation amount was 155 g/hr under the same test conditions. Under experimental conditions, the power loss was 830W.
Example 9
As shown in fig. 8 to 10, the present embodiment provides an electrocoagulation device comprising:
a first electrode 301 capable of conducting electrons to a water mist containing nitric acid; when electrons are conducted to the nitric acid mist, the nitric acid mist is charged;
The second electrode 302 is capable of applying an attractive force to the charged mist.
Meanwhile, as shown in fig. 8, the electrocoagulation device in this embodiment further includes an electrocoagulation housing 303 having an electrocoagulation inlet 3031 and an electrocoagulation outlet 3032, and the first electrode 301 and the second electrode 302 are each mounted in the electrocoagulation housing 303. And the first electrode 301 is fixedly connected with the inner wall of the electrocoagulation housing 303 through the electrocoagulation insulator 304, and the second electrode 302 is directly fixedly connected with the electrocoagulation housing 303. The electrocoagulation insulator 304 in this embodiment is in the shape of a column, also known as an insulation column. In another embodiment the electrocoagulation insulator 304 may also be tower-shaped or the like. The present electrocoagulation insulator 304 is primarily anti-pollution and anti-creeping. In this embodiment, the first electrode 301 and the second electrode 302 are both mesh-shaped and are both disposed between the electrocoagulation inlet 3031 and the electrocoagulation outlet 3032. The first electrode 301 has a negative potential and the second electrode 302 has a positive potential. Meanwhile, the electrocoagulation housing 303 in this embodiment has the same potential as the second electrode 302, and the electrocoagulation housing 303 also has an adsorption effect on the charged substance. In this embodiment, the electrocoagulation channel 3036 is disposed in the electrocoagulation housing, the first electrode 301 and the second electrode 302 are both installed in the electrocoagulation channel 3036, and the ratio of the cross-sectional area of the first electrode 301 to the cross-sectional area of the electrocoagulation channel 3036 is 99% to 10%, or 90% to 10%, or 80% to 20%, or 70% to 30%, or 60% to 40%, or 50%.
The electrocoagulation device in this embodiment can also be used to treat industrial tail gas containing acid mist. When the electrocoagulation device is used for treating industrial tail gas containing acid mist, the electrocoagulation inlet 3031 in this embodiment is in communication with a port for discharging industrial tail gas. As shown in fig. 8, the electric coagulation device in this embodiment works as follows: industrial tail gas flows into the electrocoagulation housing 303 from the electrocoagulation inlet 3031 and flows out through the electrocoagulation outlet 3032; in the process, the industrial tail gas flows through the first electrode 301, when the acid mist in the industrial tail gas contacts with the first electrode 301 or the distance between the industrial tail gas and the first electrode 301 reaches a certain value, the first electrode 301 transmits electrons to the acid mist, the acid mist is electrified, the second electrode 302 applies attractive force to the electrified acid mist, and the acid mist moves to the second electrode 302 and is attached to the second electrode 302; because the acid mist has the characteristics of easy belt and easy power failure, certain charged mist drops lose electricity in the process of moving to the second electrode 302, at the moment, other charged mist drops quickly transfer electrons to the mist drops which lose electricity, the process is repeated, the mist drops are in a continuous charging state, the second electrode 302 can continuously apply adsorption force to the mist drops, the mist drops are attached to the second electrode 302, and therefore acid mist in industrial tail gas is removed, acid mist is prevented from being directly discharged to the atmosphere, and pollution is caused to the atmosphere. The first electrode 301 and the second electrode 302 described above constitute an adsorption unit in this embodiment. In addition, under the condition that only one adsorption unit exists, the electrocoagulation device in the embodiment can remove 80% of acid mist in industrial tail gas, so that the discharge amount of the acid mist is greatly reduced, and the device has obvious environmental protection effect.
As shown in fig. 10, in this embodiment, 3 front connection parts 3011,3 are provided on the first electrode 301, and 3 front connection parts 3011 are respectively fixedly connected to 3 connection parts on the inner wall of the electrocoagulation housing 303 through 3 electrocoagulation insulators 304, and this connection form can effectively enhance the connection strength between the first electrode 301 and the electrocoagulation housing 303. The front connection portion 3011 is cylindrical in this embodiment, and the front connection portion 3011 may also be tower-shaped or the like in other embodiments. In this embodiment, the electrocoagulation insulating member 304 has a cylindrical shape, and in other embodiments, the electrocoagulation insulating member 304 may have a tower shape. The rear connection portion is cylindrical in this embodiment, and the electrocoagulation insulating member 304 may be tower-shaped in other embodiments. As shown in fig. 9, the electrocoagulation housing 303 in this embodiment includes a first housing portion 3033, a second housing portion 3034, and a third housing portion 3035 which are sequentially arranged from the electrocoagulation inlet 3031 to the electrocoagulation outlet 3032. The electrocoagulation inlet 3031 is located at one end of the first housing portion 3033 and the electrocoagulation outlet 3032 is located at one end of the third housing portion 3035. The first housing portion 3033 has a contour that increases gradually from the electrocoagulation inlet 3031 to the electrocoagulation outlet 3032 and the third housing portion 3035 has a contour that decreases gradually from the electrocoagulation inlet 3031 to the electrocoagulation outlet 3032. The second housing portion 3034 in this embodiment has a rectangular cross section. In this embodiment, the electrocoagulation housing 303 adopts the above structural design, so that the tail gas reaches a certain inlet flow velocity at the electrocoagulation inlet 3031, and more mainly, the airflow distribution is more uniform, and then the medium in the tail gas, such as fog drops, is more easily electrified under the excitation action of the first electrode 301. Meanwhile, the electric coagulation shell 303 is more convenient to package, reduces the material consumption, saves space, can be connected by a pipeline, and is also used for insulation. Any electrocoagulation housing 303 that achieves the above results is acceptable.
In this embodiment, the electrocoagulation inlet 3031 and the electrocoagulation outlet 3032 are both circular, and the electrocoagulation inlet 3031 may also be referred to as an air inlet and the electrocoagulation outlet 3032 may also be referred to as an air outlet. In this embodiment, the diameter of the electrocoagulation inlet 3031 is 300mm to 1000mm, specifically 500mm. Meanwhile, the diameter of the electrocoagulation inlet 3031 in this embodiment is 300mm to 1000mm, specifically 500mm.
Example 10
As shown in fig. 11 and 12, the present embodiment provides an electrocoagulation device comprising:
a first electrode 301 capable of conducting electrons to a water mist containing nitric acid; when electrons are conducted to the nitric acid-containing water mist, the nitric acid-containing water mist is charged;
the second electrode 302 is capable of applying an attractive force to the charged mist.
As shown in fig. 11 and 12, in this embodiment, there are two first electrodes 301, and the two first electrodes 301 are both net-shaped and cage-shaped. In this embodiment, there is one second electrode 302, and the second electrode 302 is mesh-shaped and has a ball cage shape. The second electrode 302 is located between the two first electrodes 301. Meanwhile, as shown in fig. 11, the electrocoagulation device in this embodiment further includes an electrocoagulation housing 303 having an electrocoagulation inlet 3031 and an electrocoagulation outlet 3032, and the first electrode 301 and the second electrode 302 are each mounted in the electrocoagulation housing 303. And the first electrode 301 is fixedly connected with the inner wall of the electrocoagulation housing 303 through the electrocoagulation insulator 304, and the second electrode 302 is directly fixedly connected with the electrocoagulation housing 303. The electrocoagulation insulator 304 in this embodiment is in the shape of a column, also known as an insulation column. In this embodiment the first electrode 301 has a negative potential and the second electrode 302 has a positive potential. Meanwhile, the electrocoagulation housing 303 in this embodiment has the same potential as the second electrode 302, and the electrocoagulation housing 303 also has an adsorption effect on the charged substance.
The electrocoagulation device in this embodiment can also be used to treat industrial tail gas containing acid mist. The electrocoagulation inlet 3031 in this embodiment may be in communication with a port for discharging industrial tail gas. As shown in fig. 11, the electric coagulation device in this embodiment works as follows: industrial tail gas flows into the electrocoagulation housing 303 from the electrocoagulation inlet 3031 and flows out through the electrocoagulation outlet 3032; in the process, the industrial tail gas firstly flows through one of the first electrodes 301, when the acid mist in the industrial tail gas contacts with the first electrode 301 or the distance between the first electrode 301 and the first electrode 301 reaches a certain value, the first electrode 301 transmits electrons to the acid mist, part of the acid mist is charged, the second electrode 302 applies attractive force to the charged acid mist, and the acid mist moves to the second electrode 302 and is attached to the second electrode 302; in addition, a part of acid mist is not adsorbed on the second electrode 302, the part of acid mist continuously flows towards the direction of the electrocoagulation outlet 3032, when the part of acid mist is contacted with the other first electrode 301 or the distance between the part of acid mist and the other first electrode 301 reaches a certain value, the part of acid mist is electrified, the electrocoagulation shell 303 applies adsorption force to the part of electrified acid mist, so that the part of electrified acid mist is attached to the inner wall of the electrocoagulation shell 303, the emission amount of acid mist in industrial tail gas is greatly reduced, and the treatment device in the embodiment can remove 90% of acid mist in industrial tail gas, so that the effect of acid mist removal is very remarkable. In addition, in this embodiment, the electrocoagulation inlet 3031 and the electrocoagulation outlet 3032 are both circular, and the electrocoagulation inlet 3031 may also be referred to as an air inlet and the electrocoagulation outlet 3032 may also be referred to as an air outlet.
Example 11
As shown in fig. 13, the present embodiment provides an electrocoagulation device, comprising:
a first electrode 301 capable of conducting electrons to a water mist containing nitric acid; when electrons are conducted to the nitric acid-containing water mist, the nitric acid-containing water mist is charged;
the second electrode 302 is capable of applying an attractive force to the charged mist.
In this embodiment, the first electrode 301 is needle-shaped, and the first electrode 301 has a negative potential. Meanwhile, the second electrode 302 is planar in this embodiment, and the second electrode 302 has a positive potential, and the second electrode 302 is also called a collector. In this embodiment, the second electrode 302 is specifically planar, and the first electrode 301 is perpendicular to the second electrode 302. In this embodiment, a line-plane electric field is formed between the first electrode 301 and the second electrode 302.
Example 12
As shown in fig. 14, the present embodiment provides an electrocoagulation device, comprising:
a first electrode 301 capable of conducting electrons to a water mist containing nitric acid; when electrons are conducted to the nitric acid-containing water mist, the nitric acid-containing water mist is charged;
the second electrode 302 is capable of applying an attractive force to the charged mist.
In this embodiment, the first electrode 301 is linear, and the first electrode 301 has a negative potential. Meanwhile, the second electrode 302 is planar in this embodiment, and the second electrode 302 has a positive potential, and the second electrode 302 is also called a collector. In this embodiment, the second electrode 302 is specifically planar, and the first electrode 301 is parallel to the second electrode 302. In this embodiment, a line-plane electric field is formed between the first electrode 301 and the second electrode 302.
Example 13
As shown in fig. 15, the present embodiment provides an electrocoagulation device, comprising:
a first electrode 301 capable of conducting electrons to a water mist containing nitric acid; when electrons are conducted to the nitric acid-containing water mist, the nitric acid-containing water mist is charged;
the second electrode 302 is capable of applying an attractive force to the charged mist.
In this embodiment, the first electrode 301 is mesh-shaped, and the first electrode 301 has a negative potential. Meanwhile, the second electrode 302 is planar in this embodiment, and the second electrode 302 has a positive potential, and the second electrode 302 is also called a collector. In this embodiment, the second electrode 302 is specifically planar, and the first electrode 301 is parallel to the second electrode 302. In this embodiment, a mesh electric field is formed between the first electrode 301 and the second electrode 302. In addition, in the present embodiment, the first electrode 301 is a mesh structure made of wire, and the first electrode 301 is made of wire mesh. The area of the second electrode 302 is larger than the area of the first electrode 301 in this embodiment.
Example 14
As shown in fig. 16, the present embodiment provides an electrocoagulation device comprising:
a first electrode 301 capable of conducting electrons to a water mist containing nitric acid; when electrons are conducted to the nitric acid-containing water mist, the nitric acid-containing water mist is charged;
The second electrode 302 is capable of applying an attractive force to the charged mist.
In this embodiment, the first electrode 301 is dot-shaped, and the first electrode 301 has a negative potential. Meanwhile, the second electrode 302 is barrel-shaped in this embodiment, and the second electrode 302 has a positive potential, and the second electrode 302 is also called a collector. The first electrode 301 is fixed by a metal wire or a metal needle in this embodiment. And the first electrode 301 is located at the geometric symmetry center of the barrel-shaped second electrode 302 in this embodiment. In this embodiment, a dot bucket electric field is formed between the first electrode 301 and the second electrode 302.
Example 15
As shown in fig. 17, the present embodiment provides an electrocoagulation device, comprising:
a first electrode 301 capable of conducting electrons to a water mist containing nitric acid; when electrons are conducted to the nitric acid-containing water mist, the nitric acid-containing water mist is charged;
the second electrode 302 is capable of applying an attractive force to the charged mist.
In this embodiment, the first electrode 301 is linear, and the first electrode 301 has a negative potential. Meanwhile, the second electrode 302 is barrel-shaped in this embodiment, and the second electrode 302 has a positive potential, and the second electrode 302 is also called a collector. The first electrode 301 is fixed by a metal wire or a metal needle in this embodiment. And in this embodiment the first electrode 301 is located on the geometric symmetry axis of the barrel-shaped second electrode 302. In this embodiment, a wire barrel electric field is formed between the first electrode 301 and the second electrode 302.
Example 16
As shown in fig. 18, the present embodiment provides an electrocoagulation device, comprising:
a first electrode 301 capable of conducting electrons to a water mist containing nitric acid; when electrons are conducted to the nitric acid-containing water mist, the nitric acid-containing water mist is charged;
the second electrode 302 is capable of applying an attractive force to the charged mist.
In this embodiment, the first electrode 301 is mesh-shaped, and the first electrode 301 has a negative potential. Meanwhile, the second electrode 302 is barrel-shaped in this embodiment, and the second electrode 302 has a positive potential, and the second electrode 302 is also called a collector. The first electrode 301 is fixed by a metal wire or a metal needle in this embodiment. And the first electrode 301 is located at the geometric symmetry center of the barrel-shaped second electrode 302 in this embodiment. In this embodiment, a mesh drum electric coagulation field is formed between the first electrode 301 and the second electrode 302.
Example 17
As shown in fig. 19, the present embodiment provides an electrocoagulation device, comprising:
a first electrode 301 capable of conducting electrons to a water mist containing nitric acid; when electrons are conducted to the nitric acid-containing water mist, the nitric acid-containing water mist is charged;
the second electrode 302 is capable of applying an attractive force to the charged mist.
In this embodiment, there are two second electrodes 302, and the first electrode 301 is located between the two second electrodes 302, the length of the first electrode 301 along the left-right direction is greater than the length of the second electrode 302 along the left-right direction, and the left end of the first electrode 301 is located at the left side of the second electrode 302. The left end of the first electrode 301 and the left end of the second electrode 302 form a power line extending in an oblique direction. An asymmetric electric coagulation field is formed between the first electrode 301 and the second electrode 302 in this embodiment. In use, a mist (low specific resistance substance), such as fog drops, enters between the two second electrodes 302 from the left. After some of the mist droplets are charged, the mist droplets are moved from the left end of the first electrode 301 to the left end of the second electrode 302 in an oblique direction, thereby exerting a pulling action on the mist droplets.
Example 18
As shown in fig. 20, the present embodiment provides an electrocoagulation device, comprising:
a first electrode capable of conducting electrons to a water mist containing nitric acid; when electrons are conducted to the nitric acid-containing water mist, the nitric acid-containing water mist is charged;
and a second electrode capable of applying an attractive force to the charged mist.
The first electrode and the second electrode constitute an adsorbing unit 3010 in this embodiment. In this embodiment, there are a plurality of adsorbing units 3010, and all adsorbing units 3010 are distributed in the horizontal direction. In this embodiment, all the adsorbing units 3010 are specifically distributed in the left-right direction.
Example 19
As shown in fig. 21, the present embodiment provides an electrocoagulation device, comprising:
a first electrode capable of conducting electrons to a water mist containing nitric acid; when electrons are conducted to the nitric acid-containing water mist, the nitric acid-containing water mist is charged;
and a second electrode capable of applying an attractive force to the charged mist.
The first electrode and the second electrode constitute an adsorbing unit 3010 in this embodiment. In this embodiment, there are a plurality of adsorbing units 3010, and all adsorbing units 3010 are distributed in the up-down direction.
Example 20
As shown in fig. 22, the present embodiment provides an electrocoagulation device comprising:
a first electrode capable of conducting electrons to a water mist containing nitric acid; when electrons are conducted to the nitric acid-containing water mist, the nitric acid-containing water mist is charged;
And a second electrode capable of applying an attractive force to the charged mist.
The first electrode and the second electrode constitute an adsorbing unit 3010 in this embodiment. In this embodiment, there are a plurality of adsorption units 3010, and all the adsorption units 3010 are distributed diagonally.
Example 21
As shown in fig. 23, the present embodiment provides an electrocoagulation device, comprising:
a first electrode capable of conducting electrons to a water mist containing nitric acid; when electrons are conducted to the nitric acid-containing water mist, the nitric acid-containing water mist is charged;
and a second electrode capable of applying an attractive force to the charged mist.
The first electrode and the second electrode constitute an adsorbing unit 3010 in this embodiment. In this embodiment, there are a plurality of adsorption units 3010, and all the adsorption units 3010 are distributed in the spiral direction.
Example 22
As shown in fig. 24, the present embodiment provides an electrocoagulation device, comprising:
a first electrode capable of conducting electrons to a water mist containing nitric acid; when electrons are conducted to the nitric acid-containing water mist, the nitric acid-containing water mist is charged;
and a second electrode capable of applying an attractive force to the charged mist.
The first electrode and the second electrode constitute an adsorbing unit 3010 in this embodiment. In this embodiment, there are a plurality of adsorption units 3010, and all the adsorption units 3010 are distributed in the left-right direction, the up-down direction, and the oblique direction.
In summary, the present invention effectively overcomes the disadvantages of the prior art and has high industrial utility value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. An engine exhaust ozone purification system, comprising:
an ozone source for providing an ozone stream;
the reaction field is used for mixing and reacting the ozone flow and the tail gas flow;
an ozone digestion device for digesting ozone in the tail gas treated by the reaction field;
the denitration device is used for removing nitric acid in a mixed reaction product of the ozone flow and the tail gas flow; the denitrification facility includes the electrocoagulation device, the electrocoagulation device includes:
an electrocoagulation flow channel;
a first electrode positioned in the electrocoagulation channel, the first electrode capable of conducting electrons to a water mist containing nitric acid; when electrons are conducted with the nitric acid-containing water mist, the nitric acid-containing water mist is charged;
A second electrode capable of applying an attractive force to the charged nitric acid-containing water mist;
the two second electrodes are arranged, the first electrode is positioned between the two second electrodes, the length of the first electrode along the left-right direction is larger than that of the second electrode along the left-right direction, the left end of the first electrode is positioned at the left side of the second electrode, and the left end of the first electrode and the left end of the second electrode form a power line extending along an oblique direction;
the first electrode is electrically connected with one electrode of the power supply, the second electrode is electrically connected with the other electrode of the power supply, and the voltage of the power supply is smaller than the initial corona onset voltage;
the denitration device further comprises a denitration liquid collection unit for storing the nitric acid aqueous solution and/or the nitric acid aqueous solution removed from the waste gas; when the denitration liquid collection unit stores the nitric acid aqueous solution, the denitration liquid collection unit is provided with an alkali liquor adding unit.
2. The engine exhaust gas ozone purification system as set forth in claim 1, wherein a front through hole is provided on said first electrode.
3. The engine exhaust gas ozone purification system according to claim 1 or 2, characterized in that the second electrode is made of an electrically conductive substance.
4. The engine exhaust gas ozone purification system according to claim 1 or 2, characterized in that a surface of the second electrode has a conductive substance.
5. The engine exhaust ozone purification system of claim 1, wherein the first electrode is electrically connected to a cathode of a power supply and the second electrode is electrically connected to an anode of the power supply.
6. The engine exhaust gas ozone purification system as set forth in claim 5, wherein the voltage of said power supply is 0.1 kv/mm-2 kv/mm.
7. An engine exhaust gas ozone purification method, characterized in that the engine exhaust gas ozone purification method is realized based on the engine exhaust gas ozone purification system according to any one of claims 1-6, comprising the steps of: removing nitric acid in the mixed reaction product of the ozone flow and the tail gas flow; flowing the gas with the nitric acid mist through the first electrode; when the gas with the nitric acid mist flows through the first electrode, the first electrode charges the nitric acid mist in the gas, and the second electrode applies attractive force to the charged nitric acid mist to enable the nitric acid mist to move towards the second electrode until the nitric acid mist is attached to the second electrode; the first electrode charges the nitric acid mist in the gas by contacting with the nitric acid mist.
8. The method of purifying engine exhaust gas by ozone according to claim 7, wherein the first electrode introduces electrons into the nitric acid mist, and the electrons are transferred between mist droplets located between the first electrode and the second electrode, and more mist droplets are charged.
9. The method for purifying engine exhaust gas ozone according to claim 7 or 8, characterized in that electrons are conducted between the first electrode and the second electrode through nitric acid mist, and an electric current is formed.
10. The method for purifying engine exhaust gas ozone according to claim 9, wherein the nitric acid mist attached to the second electrode forms water droplets, and the water droplets on the second electrode flow into the collecting tank.
CN201980069653.6A 2018-10-22 2019-10-21 Engine tail gas ozone purification system and method Active CN113366203B (en)

Applications Claiming Priority (19)

Application Number Priority Date Filing Date Title
CN2018112275732 2018-10-22
CN201811227573 2018-10-22
CN201811525874 2018-12-13
CN2018115258743 2018-12-13
CN2019102112841 2019-03-20
CN201910211284 2019-03-20
CN2019103404438 2019-04-25
CN201910340445 2019-04-25
CN2019103404457 2019-04-25
CN201910340443 2019-04-25
CN201910418872 2019-05-20
CN2019104188722 2019-05-20
CN2019104521693 2019-05-28
CN201910452169 2019-05-28
CN201910605156 2019-07-05
CN2019106051565 2019-07-05
CN2019106367106 2019-07-15
CN201910636710 2019-07-15
PCT/CN2019/112137 WO2020083162A1 (en) 2018-10-22 2019-10-21 System and method for purifying engine exhaust by using ozone

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1513753A (en) * 2003-06-13 2004-07-21 大连海事大学 Method of producing sulfuric acid using hydroxg oxidation of sulfur dioxide
WO2004109070A1 (en) * 2003-06-03 2004-12-16 Hino Motors, Ltd. Exhaust gas cleaner
CN1584303A (en) * 2004-06-16 2005-02-23 赵胤铨 Tail-gas purifier of vehicle
CN101337152A (en) * 2008-08-07 2009-01-07 大连海事大学 Resource ozone oxidation dry method capable of removing sulfur dioxide and nitrogen oxides in flue gas
JP2014047670A (en) * 2012-08-30 2014-03-17 Denso Corp Control method and unit for nox aftertreatment device of engine including ozone generation means
CN103768942A (en) * 2014-02-19 2014-05-07 大连海事大学 Method for purifying tail gas of diesel engine through plasmas

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004109070A1 (en) * 2003-06-03 2004-12-16 Hino Motors, Ltd. Exhaust gas cleaner
CN1513753A (en) * 2003-06-13 2004-07-21 大连海事大学 Method of producing sulfuric acid using hydroxg oxidation of sulfur dioxide
CN1584303A (en) * 2004-06-16 2005-02-23 赵胤铨 Tail-gas purifier of vehicle
CN101337152A (en) * 2008-08-07 2009-01-07 大连海事大学 Resource ozone oxidation dry method capable of removing sulfur dioxide and nitrogen oxides in flue gas
JP2014047670A (en) * 2012-08-30 2014-03-17 Denso Corp Control method and unit for nox aftertreatment device of engine including ozone generation means
CN103768942A (en) * 2014-02-19 2014-05-07 大连海事大学 Method for purifying tail gas of diesel engine through plasmas

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