CN113366203A

CN113366203A - Engine tail gas ozone purification system and method

Info

Publication number: CN113366203A
Application number: CN201980069653.6A
Authority: CN
Inventors: 唐万福; 王大祥; 奚勇
Original assignee: Shanghai Bixiufu Enterprise Management Co Ltd
Current assignee: Shanghai Bixiufu Enterprise Management Co Ltd
Priority date: 2018-10-22
Filing date: 2019-10-21
Publication date: 2021-09-07
Anticipated expiration: 2039-10-21
Also published as: CN113366203B

Abstract

The engine tail gas ozone purification system comprises a reaction field (202) for mixing and reacting an ozone stream and a tail 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 engine to environment mainly comes from the exhaust product of engine, i.e. engine tail gas, at present, for the purification of diesel engine tail gas, the conventional technical route is to use oxidation catalyst DOC to remove hydrocarbon THC and CO, and at the same time, to oxidize the low valence NO into high valence NO₂(ii) a Filtering the particulate matter PM with a diesel particulate trap (DPF) after the DOC; injecting urea after a diesel particulate trap DPF, the urea decomposing into ammonia NH in the exhaust₃，NH ₃After selective catalytic SCR and NO₂Carrying out selective catalytic reduction reaction to generate nitrogen N₂And water. Excess NH is finally added to the ammonia oxidation catalyst ASC₃By oxidation to N₂And a large amount of urea is required to be added for purifying the tail gas of the engine in the prior art, and the purification effect is general.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention provides an engine exhaust ozone purification system and method, which is used to solve at least one of the problems of the prior art that the purification of exhaust requires a large amount of urea and the purification effect of exhaust is generally high. The research of the invention finds that the high-valence nitrogen oxides generated by the reaction of ozone and the nitrogen oxides in the tail gas are not final products, and the tail gas has enough Volatile Organic Compounds (VOC) to generate enough water to react with the high-valence nitrogen oxides to generate nitric acid, so that the tail gas of the engine is treated by the ozone to remove NO by the ozone_XThe effect is better, and the unexpected technical effect is achieved.

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 tail gas ozone purification system.

2. Example 2 provided by the 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 pipe.

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 off-gas and ozone mix and react.

6. Example 6 provided by the present invention: including the above example 4 or 5, wherein the reactor includes a plurality of honeycomb-shaped cavities for providing a space for mixing and reacting the exhaust gas with the ozone; gaps are arranged between the honeycomb cavities and used for introducing cold media and controlling the reaction temperature of the tail gas and the ozone.

7. Example 7 provided by the present invention: including any of examples 4-6 above, wherein the reactor includes a number of carrier units that provide a reaction site.

8. Example 8 provided by the invention: including any of the above examples 4-7, wherein the reactor includes a catalyst unit for promoting an oxidation reaction of the exhaust gas.

9. Example 9 provided by the present invention: including any of the above examples 2 to 8, wherein the reaction field is provided with an ozone inlet selected from at least one of a jet, a shower grid, a nozzle, a swirl nozzle, a jet provided with a venturi.

10. Example 10 provided by the invention: including any one of the above examples 2 to 9, wherein the reaction field is provided with an ozone inlet through which the ozone enters the reaction field to contact the exhaust gas, the ozone inlet being arranged to form at least one of the following directions: the tail gas flow direction is opposite to the tail gas flow direction, is vertical to the tail gas flow direction, is tangential to the tail gas flow direction, is inserted into the tail gas flow direction, and is contacted with the tail gas in multiple directions.

11. Example 11 provided by the present invention: including any of examples 2-10 above, wherein the reaction field includes an exhaust pipe, a heat accumulator device, or a catalyst.

12. Example 12 provided by the present invention: including any one of examples 2 through 11 above, wherein the temperature of the reaction field is-50-200 ℃.

13. Example 13 provided by the present invention: including the above example 12, wherein the temperature of the reaction field is 60-70 ℃.

14. Example 14 provided by the present invention: including any of the above examples 1-13, wherein the exhaust ozone purification system further comprises 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 unit 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 an extended-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, and a radiation-irradiated particle generator.

17. Example 17 provided by the invention: including example 15 above, wherein the ozone generator includes an electrode with a catalyst layer disposed thereon, the catalyst layer including an oxidation-catalysis bond-cleavage-selective catalyst layer.

18. Example 18 provided by the present invention: example 17 above is included, wherein the electrode comprises a high voltage electrode or a high voltage electrode provided with a blocking dielectric layer, and when the electrode comprises a high voltage electrode, the oxidative catalytic bond cleavage selective catalyst layer is disposed on a surface of the high voltage electrode, and when the electrode comprises a high voltage electrode of a blocking dielectric layer, the oxidative catalytic bond cleavage selective catalyst layer is disposed on a surface of the blocking dielectric layer.

19. Example 19 provided by the present invention: including example 18 above, wherein the barrier medium 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 example 18 above, wherein, when the electrode comprises a high voltage electrode, the oxidative catalytic bond cleavage selective catalyst layer has a thickness of 1 to 3 mm; when the electrode comprises a high-voltage electrode of a barrier dielectric layer, the load of the oxidative catalytic bond cracking selective catalyst layer comprises 1-12 wt% of the barrier dielectric layer.

21. Example 21 provided by the present invention: including any one of examples 17 to 20 above, wherein the oxidative catalytic bond cleavage selective catalyst layer comprises the following components in weight percent:

5-15% of active component;

85-95% of a coating;

wherein the active component is selected from at least one of a metal M and a compound of a metal element M, the metal element M being selected from 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 aluminum oxide, cerium oxide, zirconium oxide, manganese oxide, metal composite oxides, porous materials and layered materials, and the metal composite oxides comprise composite oxides of one or more metals of aluminum, cerium, zirconium and manganese.

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: the above example 21 is included, wherein the transition metal element is at least one selected from 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: the above example 21 is included, 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 invention: including the above example 21, wherein the lanthanoid rare earth element is selected from at least one of lanthanum, cerium, praseodymium, and samarium.

27. Example 27 provided by the present invention: the above example 21 is included, wherein the compound of the metal element M is at least one selected from the group consisting of an oxide, a sulfide, a sulfate, a phosphate, a carbonate, and a perovskite.

28. Example 28 provided by the invention: including the above example 21, wherein the porous material is selected from at least one of a molecular sieve, diatomaceous earth, zeolite, and carbon nanotubes.

29. Example 29 provided by the present invention: the above example 21 is included, wherein the layered material is selected from at least one of graphene and graphite.

30. Example 30 provided by the present invention: including any one of the above examples 1 to 29, wherein the 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.

31. Example 31 provided by the present invention: including the above example 30, wherein the control unit controls the amount of ozone required for the mixing reaction according to the content of the components of the exhaust gas before the ozone treatment.

32. Example 32 provided by the invention: including the above-mentioned example 30 or 31, wherein the ozone amount control apparatus further includes a pre-ozone treatment exhaust gas component detection unit for detecting a content of a pre-ozone treatment exhaust gas component.

33. Example 33 provided by the present invention: the method includes the above example 32, wherein the before-ozone-treatment exhaust gas component detection unit includes a first nitrogen oxide detection unit for detecting the content of nitrogen oxide in the before-ozone-treatment exhaust gas.

34. Example 34 provided by the invention: including the above example 32 or 33, wherein the before-ozone-treatment exhaust gas component detection unit includes a first CO detection unit configured to detect a CO content in the before-ozone-treatment exhaust gas.

35. Example 35 provided by the invention: any one of the above examples 32 to 34 is included, wherein the before-ozone-treatment exhaust gas component detection unit includes a first volatile organic compound detection unit configured to detect a content of volatile organic compounds in the before-ozone-treatment exhaust gas.

36. Example 36 provided by the 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 according to 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 one of the above examples 30 to 36, wherein the control unit is configured to control the amount of ozone required for the mixing reaction according to a preset mathematical model.

38. Example 38 provided by the invention: including any one of the above examples 30 to 37, wherein the control unit is configured to control the amount of ozone required for the mixing reaction according to a theoretical estimation.

39. Example 39 provided by the invention: including any of the above examples 38, wherein the theoretical estimate is: the molar ratio of the ozone introduction amount to the object to be treated in the tail gas is 2-10.

40. Example 40 provided by the present invention: including any one of the above examples 30 to 39, wherein the control unit controls an amount of ozone required for the mixing reaction according to a content of the component of the ozone-treated exhaust gas.

41. Example 41 provided by the present invention: including any one of the above examples 30 to 40, wherein the ozone amount control device includes an ozone-treated exhaust gas component detection unit configured to detect a component content of the ozone-treated exhaust gas.

42. Example 42 provided by the present invention: including above-mentioned example 41, wherein, the ozone-treated tail gas component detection unit includes a first ozone detection unit for detecting the ozone content in the ozone-treated tail gas.

43. Example 43 provided by the invention: including the above example 41 or 42, wherein the ozone-treated exhaust gas component detection unit includes a second nitrogen oxide detection unit configured to detect a nitrogen oxide content in the ozone-treated exhaust gas.

44. Example 44 provided by the invention: including any one of examples 41-43 above, wherein the post-ozone treatment tail gas component detection unit includes a second CO detection unit to detect a CO content in the post-ozone treatment tail gas.

45. Example 45 provided by the invention: including any of examples 41-44 above, wherein the ozone-treated exhaust gas component detection unit includes a second voc detection unit configured to detect a voc content in the ozone-treated exhaust gas.

46. Example 46 provided by the invention: including any one of the above examples 42 to 45, wherein the control unit controls the amount of ozone in accordance with an output value of at least one of the ozone-treated exhaust gas component detection units.

47. Example 47 provided by the invention: including any of examples 1-46 above, wherein the exhaust gas ozone purification system further comprises a denitration plant to remove nitric acid from a reaction product of the mixing of the ozone stream and the exhaust gas stream.

48. Example 48 provided by the invention: including example 47 above, wherein the denitrification device comprises an electrocoagulation device comprising:

an electrocoagulation flow channel;

a first electrode located in the electrocoagulation flow channel;

a second electrode.

49. Example 49 provided by the invention: including example 48 above, wherein the first electrode is a solid, a liquid, a gas cluster, a plasma, a conductive mixed-state substance, a biological natural mixed conductive substance, or a combination of one or more forms of an object artificially processed to form a conductive substance.

50. Example 50 provided by the invention: including examples 48 or 49 above, wherein the first electrode is a solid metal, graphite, or 304 steel.

51. Example 51 provided by the present invention: including any of examples 48-50 above, wherein the first electrode is in the form of a dot, a wire, a mesh, a perforated plate, a needle-stick, a ball-cage, a box, a tube, a natural-form substance, or a processed-form substance.

52. Example 52 provided by the 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 example 52 above, wherein the front via is polygonal, circular, elliptical, square, rectangular, trapezoidal, or diamond in shape.

54. Example 54 provided by the invention: including the above-mentioned example 52 or 53, wherein the aperture of the front through hole is 0.1 to 3 mm.

55. Example 55 provided by the invention: including any of examples 48-54 above, wherein the second electrode is in the form of a multilayer mesh, a perforated plate, a tube, a barrel, a cage, a box, a plate, a stacked-layer of particles, a bent plate, or a panel.

56. Example 56 provided by the invention: including any of examples 48-55 above, wherein the second electrode is provided with a rear via.

57. Example 57 provided by the invention: including example 56 above, wherein the rear via is polygonal, circular, elliptical, square, rectangular, trapezoidal, or diamond shaped.

58. Example 58 provided by the invention: including the above example 56 or 57, wherein the aperture of the rear through-hole is 0.1 to 3 mm.

59. Example 59 provided by the invention: including any of examples 48 to 58 above, wherein the second electrode is made of a conductive substance.

60. Example 60 provided by the invention: including any of examples 48-59 above, wherein a surface of the second electrode has a conductive substance.

61. Example 61 provided by the invention: including any of examples 48 to 60 above, wherein the first and second electrodes have an electrocoagulation electric field therebetween, the electrocoagulation electric field being one or more of a point-surface electric field, a line-surface electric field, a mesh-surface electric field, a point-bucket electric field, a line-bucket electric field, or a mesh-bucket electric field in combination.

62. Example 62 provided by the invention: any one of the above examples 48 to 61 is included, wherein the first electrode is linear and the second electrode is planar.

63. Example 63 provided by the invention: including any of examples 48-62 above, wherein the first electrode is perpendicular to the second electrode.

64. Example 64 provided by the invention: including any of examples 48-63 above, wherein the first electrode is parallel to the second electrode.

65. Example 65 provided by the invention: including any of examples 48-64 above, wherein the first electrode is curvilinear or arcuate.

66. Example 66 provided by the invention: any one of the above examples 48 to 65 is included, wherein the first electrode and the second electrode are planar and the first electrode and the second electrode are parallel.

67. Example 67 provided by the invention: any of examples 48 to 66 above is included, wherein the first electrode is a wire mesh.

68. Example 68 provided by the invention: including any of the above examples 48-67, wherein the first electrode is planar or spherical.

69. Example 69 provided by the present invention: including any of examples 48-68 above, wherein the second electrode is curved or spherical.

70. Example 70 provided by the invention: including any of examples 48-69 above, wherein the first electrode is in the shape of a dot, a wire, or a mesh, the second electrode is in the shape of a barrel, the first electrode is located inside the second electrode, and the first electrode is located on a central axis of symmetry of the second electrode.

71. Example 71 provided by the 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 invention: including any of examples 48-71 above, wherein the first electrode is electrically connected to a cathode of a power source and the second electrode is electrically connected to an anode of the power source

73. Example 73 provided by the invention: including the above example 71 or 72, wherein the voltage of the power supply is 5-50 KV.

74. Example 74 provided by the invention: any of examples 71 to 73 above are included, wherein the voltage of the power supply is less than the starting corona onset voltage.

75. Example 75 provided by the invention: any of the above examples 71 to 74 are included, wherein the voltage of the power supply is 0.1kv-2 kv/mm.

76. Example 76 provided by the invention: any of the above examples 71 to 75 are included, wherein the voltage waveform of the power supply is a dc waveform, a sine wave, or a modulated waveform.

77. Example 77 provided by the invention: including any of examples 71-76 above, wherein the power source is an alternating current power source having variable frequency pulses in a range of 0.1Hz to 5 GHz.

78. Example 78 provided by the invention: any of examples 48 to 77 above are included, 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 invention: any of examples 48 to 78 above is included, 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 invention: including any of examples 48-79 above, wherein the distance between the first and second electrodes is 5-50 millimeters.

81. Example 81 provided by the invention: any one of the above examples 48 to 80 is included, wherein the first electrode and the second electrode constitute an adsorption unit, and the adsorption unit is plural.

82. Example 82 provided by the invention: including the above-described example 81, in which all the adsorption units are distributed in one or more of the left-right direction, the front-rear direction, the oblique direction, or the spiral direction.

83. Example 83 provided by the invention: including any one of examples 48 to 82 above, further comprising 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 electrocoagulation outlet, respectively.

84. Example 84 provided by the invention: including example 83 above, wherein the electrocoagulation inlet is circular and the diameter of the electrocoagulation inlet is 300-.

85. Example 85 provided by the invention: including examples 83 or 84 above, wherein the electrocoagulation outlet is circular and the diameter of the electrocoagulation outlet is 300mm, 1000mm, or 500 mm.

86. Example 86 provided by the invention: including any one of the above examples 83 to 85, wherein the electrocoagulation housing comprises a first housing section, a second housing section, and a third housing section sequentially distributed from an electrocoagulation inlet at one end of the first housing section to an electrocoagulation outlet at one end of the third housing section.

87. Example 87 provided by the invention: including example 86 above, wherein the first housing section has a profile that increases in size from the electrocoagulation inlet to the electrocoagulation outlet.

88. Example 88 provided by the invention: including examples 86 or 87 above, wherein the first housing portion is straight.

89. Example 89 provided by the 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 invention: including any one of examples 86-89 above, wherein the third housing section has a profile that decreases in size from the electrocoagulation inlet to the electrocoagulation outlet.

91. Example 91 provided by the invention: any of the above examples 86-90 are included, wherein the first, second, and third housing portions are each rectangular in cross-section.

92. Example 92 provided by the invention: including any of the above examples 83-91, wherein the electrocoagulation housing is made of stainless steel, aluminum alloy, iron alloy, cloth, sponge, molecular sieve, activated carbon, foamed iron, or foamed silicon carbide.

93. Example 93 provided by the invention: including any one of examples 48 to 92 above, wherein the first electrode is connected to the electrocoagulation housing by electrocoagulation insulation.

94. Example 94 provided by the invention: including example 93 above, wherein the electrocoagulation insulation member is made of insulating mica.

95. Example 95 provided by the invention: including examples 93 or 94 above, wherein the electrocoagulation insulation is in the shape of a column, or a tower.

96. Example 96 provided by the invention: including any one of examples 48 to 95 above, wherein the first electrode is provided with a cylindrical front connection portion, and the front connection portion is fixedly connected with the electrocoagulation insulating member.

97. Example 97 provided by the invention: including any one of examples 48 to 96 above, wherein the second electrode is provided with a cylindrical rear connection portion, and the rear connection portion is fixedly connected with the electrocoagulation insulating member.

98. Example 98 provided by the invention: including any one of examples 48 to 97 above, wherein the ratio of the cross-sectional area of the first electrode to the cross-sectional area of the electrocoagulation flow channel is 99-10%, or 90-10%, or 80-20%, or 70-30%, or 60-40%, or 50%.

99. Example 99 provided by the invention: including any one of above-mentioned examples 47 to 98, wherein the denitration device includes a condensation unit for condensing the ozone-treated exhaust gas to realize gas-liquid separation.

100. Example 100 provided by the invention: including any one of examples 47-99 above, wherein the denitration device includes a leaching unit to leach the ozone-treated tail gas.

101. Example 101 provided by the invention: including example 100 above, the denitration device further includes an elution liquid unit for providing an elution liquid to the elution unit.

102. Example 102 provided by the invention: including example 101 above, wherein the leacheate in the leacheate unit comprises water and/or a base.

103. Example 103 provided by the invention: including any one of examples 47 to 102 above, wherein the denitration apparatus further includes a denitration liquid collection unit configured to store the aqueous nitric acid solution and/or the aqueous nitrate solution removed from the tail gas.

104. Example 104 provided by the invention: including the above example 103, wherein, when the denitration liquid collecting unit stores therein an aqueous nitric acid solution, the denitration liquid collecting unit is provided with an alkali solution addition unit for forming nitrate with nitric acid.

105. Example 105 provided by the invention: including any one of examples 1 through 104 above, wherein the exhaust gas ozone purification system further includes an ozone digester for digesting ozone in the exhaust gas after the reaction field treatment.

106. Example 106 provided by the invention: including example 105 above, 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 invention: any one of the above examples 1 to 106 is included, wherein the exhaust gas ozone purification system further includes 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 the 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 invention: example 107 above is included, 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 invention: any of the above examples 1-108 is included, wherein an engine is also included.

110. Example 110 provided by the invention: an exhaust gas ozone purification method comprises the following steps: and mixing the ozone stream and the tail gas stream for reaction.

111. Example 111 provided by the invention: the exhaust gas ozone purification method of example 110 is included, wherein the exhaust stream includes nitrogen oxides and volatile organic compounds.

112. Example 112 provided by the invention: the method of ozone purification of tail gas comprising examples 110 or 111, wherein the mixing of the ozone stream and the tail gas stream is reacted at a low temperature section of the tail gas.

113. Example 113 provided by the invention: the method for purifying the tail gas by using the ozone comprises any one of the examples 110 to 112, wherein the mixing reaction temperature of the ozone stream and the tail gas stream is-50-200 ℃.

114. Example 114 provided by the invention: the method for purifying the tail gas by using the ozone comprises the step 113, wherein the mixing reaction temperature of an ozone stream and a tail gas stream is 60-70 ℃.

115. Example 115 provided by the invention: the exhaust gas ozone purification method comprising any one of examples 110-114, wherein the ozone stream and the exhaust stream are mixed by at least one selected from venturi mixing, positive pressure mixing, plug-in mixing, kinetic mixing, and fluid mixing.

116. Example 116 provided by the invention: the method of ozone purification of exhaust gas of example 115 is included, wherein when the ozone stream is mixed with the exhaust stream at a positive pressure, a pressure of the ozone feed gas is greater than a pressure of the exhaust gas.

117. Example 117 provided by the invention: the method of ozone purification of exhaust gas of example 110 is included, wherein the flow rate of the exhaust stream is increased and the ozone stream is mixed using venturi principles before the mixing reaction of the ozone stream and the exhaust stream.

118. Example 118 provided by the invention: the method for purifying exhaust gas by ozone according to example 110, wherein the mixing manner of the ozone stream and the exhaust stream is at least one selected from the group consisting of reverse flow introduction of an exhaust gas outlet, front-stage mixing of a reaction field, front-and-back insertion of a dust remover, front-and-back mixing of a denitration device, front-and-back mixing of a catalytic device, front-and-back introduction of a water washing device, front-and-back mixing of a filtering device, front-and-back mixing of a silencing device, mixing of an exhaust gas in a pipeline, mixing of an adsorption device outside and mixing of a condensation device in front-and-back.

119. Example 119 provided by the invention: the exhaust gas ozone purification method of example 110, wherein the reaction site where the ozone stream is mixed with the exhaust stream comprises a pipeline and/or a reactor.

120. Example 120 provided by the invention: the exhaust ozone purification method according to any one of examples 110 to 119, wherein the reaction field includes an exhaust pipe, a heat storage device, or a catalyst.

121. Example 121 provided by the invention: the method for purifying exhaust gas by ozone according to example 120, further comprising at least one of the following technical features:

1) the drift diameter of the pipe section of the pipeline is 100-200 mm;

2) the length of the pipeline is 0.1 time greater than the pipe diameter;

3) the reactor is selected from at least one of:

a first reactor: the reactor is provided with a reaction chamber, and tail gas and ozone are mixed and react in the reaction chamber;

and (2) a second reactor: the reactor comprises a plurality of honeycomb-shaped cavities for providing a space for mixing and reacting the tail gas and the ozone; gaps are arranged between the honeycomb cavities and used for introducing cold media and controlling the reaction temperature of the tail gas and the ozone;

a third reactor: the reactor comprises a plurality of carrier units, and the carrier units provide reaction sites;

and (4) a reactor IV: the reactor comprises a catalyst unit for promoting an oxidation reaction of the exhaust gas;

4) the reaction field is provided with an ozone inlet, and the ozone inlet is selected from at least one of a nozzle, a spray grid, a nozzle, a swirl nozzle and a nozzle with a venturi tube;

5) the reaction field is provided with an ozone inlet, the ozone enters the reaction field through the ozone inlet and contacts with the tail gas, and the arrangement of the ozone inlet forms at least one of the following directions: the tail gas flow direction is opposite to the tail gas flow direction, is vertical to the tail gas flow direction, is tangential to the tail gas flow direction, is inserted into the tail gas flow direction, and is contacted with the tail gas in multiple directions.

122. Example 122 provided by the invention: the exhaust gas ozone purification method comprising 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 invention: the method of ozone purification of exhaust gas comprising example 122, wherein the ozone generator comprises one or more of 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, and a radiation-irradiated particle generator.

124. Example 124 provided by the invention: the exhaust gas ozone purification method comprising example 122, wherein the ozone stream provides a method of: under the action of an electric field and an oxidation catalytic bond cracking selective catalyst, the gas containing oxygen generates ozone, wherein the oxidation catalytic bond cracking selective catalyst is loaded on an electrode forming the electric field.

125. Example 125 provided by the invention: the method for ozone purification of exhaust gas according to example 124, wherein the electrode comprises a high voltage electrode or an electrode provided with a barrier dielectric layer, and when the electrode comprises a high voltage electrode, the oxidative catalytic bond cleavage selective catalyst is supported on a surface of the high voltage electrode, and when the electrode comprises a high voltage electrode of a barrier dielectric layer, the oxidative catalytic bond cleavage selective catalyst is supported on a surface of the barrier dielectric layer.

126. Example 126 provided by the invention: the exhaust gas ozone purification method according to example 124, wherein when the electrode includes a high voltage electrode, the thickness of the oxidative catalytic bond cleavage selective catalyst is 1 to 3 mm; when the electrode comprises a high-voltage electrode of a barrier dielectric layer, the load capacity of the oxidative catalytic bond cracking selective catalyst comprises 1-10 wt% of the barrier dielectric layer.

127. Example 127 provided by the invention: the exhaust ozone purification method according to any one of examples 124-126, wherein the oxidative catalytic bond cracking selective catalyst comprises the following components in percentage by weight:

5-15% of active component;

85-95% of a coating;

128. Example 128 provided by the invention: the exhaust ozone purification method according to example 127, wherein the alkaline earth metal element is at least one selected from magnesium, strontium, and calcium.

129. Example 129 provided by the invention: the exhaust ozone purification method according to example 127, wherein the transition metal element is at least one selected from titanium, manganese, zinc, copper, iron, nickel, cobalt, yttrium, and zirconium.

130. Example 130 provided by the invention: the exhaust gas ozone purification method of example 127, wherein the fourth main group metal element is tin.

131. Example 131 provided by the invention: the exhaust gas ozone purification method according to example 127, wherein the precious metal element is at least one selected from the group consisting of platinum, rhodium, palladium, gold, silver, and iridium.

132. Example 132 provided by the invention: the exhaust gas ozone purification method according to example 127, wherein the lanthanoid rare earth element is at least one selected from lanthanum, cerium, praseodymium, and samarium.

133. Example 133 provided by the invention: the exhaust gas ozone purification method according to example 127, wherein the compound of the metal element M is at least one selected from an oxide, a sulfide, a sulfate, a phosphate, a carbonate, and a perovskite.

134. Example 134 provided by the invention: the exhaust ozone purification method according to example 127, wherein the porous material is at least one selected from a molecular sieve, diatomaceous earth, zeolite, and carbon nanotubes.

135. Example 135 provided by the invention: the exhaust gas ozone purification method according to example 127, wherein the layered material is selected from at least one of graphene and graphite.

136. Example 136 provided by the invention: the exhaust ozone purification method according to any one of examples 124 to 126, wherein the electrode supports the oxygen bi-catalytic bond cracking selective catalyst by impregnation and/or spraying.

137. Example 137 provided by the invention: the method for purifying exhaust gas by ozone according to example 136, comprising the steps of:

1) according to the composition ratio of the catalyst, loading the slurry of the coating raw material on the surface of the high-voltage electrode or the surface of the barrier dielectric layer, drying and calcining to obtain the high-voltage electrode or the barrier dielectric layer loaded with the coating;

2) loading a raw material solution or slurry containing a metal element M on the coating obtained in the step 1) according to the composition ratio of the catalyst, drying and calcining, and arranging a high-voltage electrode on the other surface of the blocking dielectric layer opposite to the loading coating after calcining when the coating is loaded on the surface of the blocking dielectric layer to obtain the electrode for the ozone generator; or loading a raw material solution or slurry containing the metal element M on 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 blocking dielectric layer, a high-voltage electrode is arranged on the other surface, opposite to the loading coating, of the blocking dielectric layer after post-treatment, and then the electrode for the ozone generator is obtained;

wherein, the control of the active component form in the electrode catalyst is realized by the calcination temperature and atmosphere and the post-treatment.

138. Example 138 provided by the invention: the method for purifying exhaust gas by ozone according to example 136, comprising the steps of:

1) loading a raw material solution or slurry containing a metal element M on a coating raw material according to the composition ratio of the catalyst, drying and calcining to obtain a coating material loaded with an active component;

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 the high-voltage electrode or the surface of the blocking dielectric layer, drying and calcining, and arranging the high-voltage electrode on the other surface of the blocking dielectric layer, which is opposite to the loading coating, after calcining when the coating is loaded on the surface of the blocking dielectric layer, so as to obtain 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 the high-voltage electrode or the surface of the blocking dielectric layer, drying, calcining and post-treating, and arranging the high-voltage electrode on the other surface of the blocking dielectric layer, which is opposite to the loading coating, after post-treatment when the coating is loaded on the surface of the blocking dielectric layer, so as to obtain the electrode for the ozone generator;

139. Example 139 provided by the invention: the exhaust ozone purification method of any one of examples 110 to 138, comprising: the amount of ozone in the ozone stream is controlled so as to effectively oxidize the gaseous components of the exhaust gas to be treated.

140. Example 140 provided by the 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 a removal efficiency as follows:

nitrogen oxide removal efficiency: 60-99.97%;

efficiency of CO removal: 1-50%;

volatile organic compound removal efficiency: 60-99.97%.

141. Example 141 provided by the invention: the method for purifying the tail gas by using the ozone comprises the following steps of: and detecting the component content of the tail gas before ozone treatment.

142. Example 142 provided by the invention: the exhaust gas ozone purification method according to any one of examples 139 to 141, wherein an amount of ozone required for the mixing reaction is controlled according to a content of the exhaust gas component before the ozone treatment.

143. Example 143 provided by the invention: the method for purifying exhaust gas by ozone according to example 141 or 142, wherein the content of the exhaust gas component before ozone treatment is detected is at least one selected from the group consisting 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 invention: the method of purifying exhaust gas with ozone according to example 143, wherein the amount of ozone required for the mixing reaction is controlled based on at least one output value obtained by detecting the content of the components in the exhaust gas before the ozone treatment.

145. Example 145 provided by the invention: the method of purifying ozone in exhaust gas according to any one of examples 139 to 144, wherein an amount of ozone required for the mixing reaction is controlled according to a preset mathematical model.

146. Example 146 provided by the invention: the exhaust gas ozone purification method according to any one of examples 139 to 145, wherein the amount of ozone required for the mixing reaction is controlled according to a theoretical estimation.

147. Example 147 provided by the invention: the method for purifying exhaust gas by ozone according to example 146, wherein the theoretical estimation value is: the molar ratio of the ozone introduction amount to the to-be-treated substance in the tail gas is 2-10.

148. Example 148 provided by the invention: the exhaust ozone purification method according to any one of examples 139 to 147, comprising: and detecting the component content of the tail gas after the ozone treatment.

149. Example 149 provided by the invention: the exhaust gas ozone purification method according to any one of examples 139 to 148, wherein an amount of ozone required for the mixing reaction is controlled according to a content of the ozone-treated exhaust gas component.

150. Example 150 provided by the invention: the exhaust gas ozone purification method according to example 148 or 149, wherein the detected ozone-treated exhaust gas component content is at least one selected from the group consisting of:

detecting the ozone content in the tail gas after ozone treatment;

detecting the content of volatile organic compounds in the tail gas after the 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 the ozone treatment.

151. Example 151 provided by the invention: the exhaust gas ozone purification method of example 150 is included, wherein the amount of ozone is controlled based on at least one output value that detects the amount of the ozone-treated exhaust gas component.

152. Example 152 provided by the invention: the exhaust ozone purification method according to any of examples 110 to 151 is included, wherein the exhaust ozone purification method further includes the steps of: and removing nitric acid in the mixed reaction product of the ozone stream and the tail gas stream.

153. Example 153 provided by the invention: the method for ozone purification of exhaust gas comprising the step of flowing the nitric acid mist-containing gas through a first electrode according to example 152;

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 exerts attraction force on 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.

154. Example 154 provided by the invention: the method for ozone purification of exhaust gas comprising EXAMPLE 153, wherein the first electrode introduces electrons into the nitric acid mist, and the electrons are transferred between the mist droplets between the first electrode and the second electrode, thereby charging more of the mist droplets.

155. Example 155 provided by the invention: the method for purifying exhaust gas by ozone as in 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 generated.

156. Example 156 provided by the invention: the method for purifying exhaust gas by ozone as described in 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 invention: the method for purifying exhaust gas by ozone as described in any one of examples 153-156, wherein the first electrode charges the nitric acid mist by means of energy fluctuation.

158. Example 158 provided by the invention: the method for purifying ozone in exhaust gas as described in any one of examples 153-157, 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.

159. Example 159 provided by the invention: the exhaust ozone purification method of example 158, wherein the water droplets on the second electrode flow into the holding tank under the influence of gravity.

160. Example 160 provided by the invention: including the tail gas ozone purification method of example 158 or 159, wherein the gas flows to blow water droplets into the collection tank.

161. Example 161 provided by the invention: the method for purifying exhaust gas by ozone as described in any one of examples 153-160, wherein the first electrode is one or more of a solid, a liquid, a gas molecular group, a plasma, a conductive mixed-state substance, a natural mixed conductive substance of an organism, or a combination of substances artificially processed to form a conductive substance.

162. Example 162 provided by the invention: the method for purifying ozone in exhaust gas of any one of examples 153-161, wherein the first electrode is solid metal, graphite, or 304 steel.

163. Example 163 provided by the invention: the method for purifying ozone in exhaust gas includes any one of the embodiments 153-162, wherein the first electrode is in the shape of a dot, a line, a net, a perforated plate, a needle bar, a ball cage, a box, a tube, a natural form substance, or a processed form substance.

164. Example 164 provided by the invention: the method for purifying exhaust gas by ozone includes any one of examples 153 and 163, wherein a front through hole is formed on the first electrode.

165. Example 165 provided by the invention: the exhaust gas ozone purification method of example 164 is included, wherein the front through-hole has a polygonal, circular, elliptical, square, rectangular, trapezoidal, or rhombic shape.

166. Example 166 provided by the invention: the exhaust gas ozone purification method according to example 164 or 165, wherein the front through hole has a hole diameter of 0.1 to 3 mm.

167. Example 167 provided by the invention: the method for purifying ozone in exhaust gas includes any one of examples 153-166, wherein the second electrode is in a shape of multi-layer mesh, perforated plate, tube, barrel, ball cage, box, plate, particle stack, bent plate, or panel.

168. Example 168 provided by the invention: the method for purifying ozone in exhaust gas according to any one of examples 153 to 167, wherein a rear through hole is formed in the second electrode.

169. Example 169 provided by the invention: the exhaust gas ozone purification method of example 168, wherein the rear through-hole has a polygonal shape, a circular shape, an oval shape, a square shape, a rectangular shape, a trapezoidal shape, or a rhombic shape.

170. Example 170 provided by the invention: the method for purifying exhaust gas by ozone according to example 168 or 169, wherein the rear through hole has a diameter of 0.1 to 3 mm.

171. Example 171 provided by the invention: the exhaust ozone purification method according to any one of examples 153 to 170, wherein the second electrode is made of a conductive material.

172. Example 172 provided by the invention: the exhaust ozone purification method according to any one of examples 153 to 171, wherein a surface of the second electrode includes a conductive material.

173. Example 173 provided by the invention: the ozone purification method for tail gas of any one of examples 153 to 172, wherein an electrocoagulation electric field is arranged between the first electrode and the second electrode, and the electrocoagulation electric field is one or more of a point-surface electric field, a line-surface electric field, a net-surface electric field, a point-barrel electric field, a line-barrel electric field or a net-barrel electric field.

174. Example 174 provided by the invention: the method for purifying ozone in exhaust gas according to any of examples 153 to 173, wherein the first electrode is linear and the second electrode is planar.

175. Example 175 provided by the invention: the exhaust ozone purification method of any one of examples 153 to 174 is included, wherein the first electrode is perpendicular to the second electrode.

176. Example 176 provided by the invention: the method of ozone purification of exhaust gas of any one of examples 153 to 175, wherein the first electrode is parallel to the second electrode.

177. Example 177 provided by the invention: the method of ozone purification of exhaust gas of any one of examples 153 to 176, wherein the first electrode is curved or arcuate.

178. Example 178 provided by the invention: the method for purifying exhaust gas by ozone includes any one of examples 153 to 177, wherein the first electrode and the second electrode are planar and parallel to each other.

179. Example 179 provided by the invention: the method of ozone purification of exhaust gas of any one of examples 153 to 178, wherein the first electrode is a wire mesh.

180. Example 180 provided by the invention: the exhaust ozone purification method according to any one of examples 153 to 179, wherein the first electrode has a planar shape or a spherical shape.

181. Example 181 provided by the invention: the method of ozone purification of exhaust gas of any one of examples 153 to 180, wherein the second electrode is curved or spherical.

182. Example 182 provided by the invention: the exhaust ozone purification method according to any one of examples 153 to 181, wherein the first electrode is in a shape of a dot, a line, or a mesh, the second electrode is in a shape of a barrel, 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 invention: the method for purifying exhaust gas by ozone as in any one of examples 153 to 182, 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.

184. Example 184 provided by the invention: the method for ozone purification of exhaust gas of any one of examples 153 to 183, 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.

185. Example 185 provided by the invention: the method for purifying the tail gas by ozone comprises 183 or 184, wherein the voltage of the power supply is 5-50 KV.

186. Example 186 provided by the invention: the exhaust ozone purification method of any one of examples 183 to 185, wherein the voltage of the power supply is less than an initial corona onset voltage.

187. Example 187 provided by the invention: the method for ozone purification of exhaust gas according to any one of examples 183 to 186, wherein the voltage of the power supply is 0.1kv-2 kv/mm.

188. Example 188 provided by the invention: the method of ozone purification of exhaust gas comprising any one of examples 183 to 187, wherein the voltage waveform of the power source is a dc waveform, a sine wave, or a modulated waveform.

189. Example 189 provided by the invention: the method for purifying tail gas by ozone comprises any one of the following examples 183 to 188, wherein the power supply is an alternating current power supply, and the frequency conversion pulse range of the power supply is 0.1Hz to 5 GHz.

190. Example 190 provided by the invention: the method of ozone purification of exhaust gas, comprising any one of examples 153 through 189, wherein the first electrode and the second electrode both 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.

191. Example 191 provided by the invention: the method of ozone purification of exhaust gas of any one of examples 153 to 190, wherein the number of the second electrodes is two, and the first electrode is located between the two second electrodes.

192. Example 192 provided by the invention: the method of ozone purification of exhaust gas comprising any of examples 153-191, wherein a distance between the first electrode and the second electrode is 5-50 mm.

193. Example 193 provided by the invention: the method for purifying exhaust gas by ozone according to any one of examples 153 to 192, wherein the first electrode and the second electrode form an adsorption unit, and the adsorption unit is provided in plurality.

194. Example 194 provided by the invention: including the exhaust gas ozone purification method of example 193, wherein all the 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 invention: the tail gas ozone purification method of any one of examples 153-194, comprising, wherein the first electrode is mounted in an electrocoagulation housing having an electrocoagulation inlet and an electrocoagulation outlet.

196. Example 196 provided by the invention: the method for purifying the tail gas by the ozone comprises an example 195, wherein the electrocoagulation inlet is circular, and the diameter of the electrocoagulation inlet is 300-1000mm or 500 mm.

197. Example 197 provided by the invention: the tail gas ozone purification method comprises the tail gas ozone purification method of example 195 or 196, wherein the electrocoagulation outlet is circular, and the diameter of the electrocoagulation outlet is 300-1000mm or 500 mm.

198. Example 198 provided by the invention: the tail gas ozone purification method of any one of examples 195 to 197, wherein 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, 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.

199. Example 199 provided by the invention: the exhaust gas ozone purification method of example 198, wherein the first housing section has a profile that increases from the electrocoagulation inlet to the electrocoagulation outlet.

200. Example 200 provided by the invention: the method of purifying exhaust gas with ozone as in example 198 or 199, wherein the first housing portion is a straight tube.

201. Example 201 provided by the invention: the exhaust ozone purification method of any one of examples 198 to 200, wherein the second housing portion is a straight tube, and the first electrode and the second electrode are mounted in the second housing portion.

202. Example 202 provided by the invention: the exhaust gas ozone purification method of any one of examples 198 to 201, wherein the third housing portion is configured to have a profile that decreases in size from the electrocoagulation inlet to the electrocoagulation outlet.

203. Example 203 provided by the invention: the method of ozone purification of exhaust gas of any one of examples 198 to 202, wherein the first, second, and third housing portions are rectangular in cross-section.

204. Example 204 provided by the invention: the ozone purification method for tail gas, comprising any one of examples 195 to 203, wherein the electrocoagulation housing is made of stainless steel, aluminum alloy, iron alloy, cloth, sponge, molecular sieve, activated carbon, foamed iron, or foamed silicon carbide.

205. Example 205 provided by the invention: the exhaust gas ozone purification method of any one of examples 153 to 204, wherein the first electrode is connected to the electrocoagulation housing by electrocoagulation insulation.

206. Example 206 provided by the invention: the method for purifying the tail gas by ozone in the example 205 is included, wherein the material of the electrocoagulation insulating member is insulating mica.

207. Example 207 provided by the invention: the method for ozone purification of tail gas comprising examples 205 or 206, wherein the electrocoagulation insulator is in the shape of a column or a tower.

208. Example 208 provided by the invention: the ozone purification method for tail gas of any one of examples 153 to 207, wherein the first electrode is provided with a cylindrical front connection part, and the front connection part is fixedly connected with the electrocoagulation insulating member.

209. Example 209 provided by the invention: the ozone purification method for tail gas of any one of examples 153 to 208, wherein a cylindrical rear connection portion is disposed on the second electrode, and the rear connection portion is fixedly connected to the electrocoagulation insulating member.

210. Example 210 provided by the invention: the exhaust gas ozone purification method comprising any one of examples 153 to 209, wherein the first electrode is located in an electrocoagulation flow channel; the gas with the nitric acid mist flows along the electrocoagulation flow channel 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 flow channel is 99% -10%, or 90-10%, or 80-20%, or 70-30%, or 60-40%, or 50%.

211. Example 211 provided by the invention: the exhaust gas ozone purification method comprising any one of examples 152-210, wherein the method of removing nitric acid from a mixed reaction product of the ozone stream and the exhaust stream comprises: and condensing the mixed reaction product of the ozone stream and the tail gas stream.

212. Example 212 provided by the invention: the exhaust gas ozone purification method comprising any one of examples 152-211, wherein the method of removing nitric acid from a mixed reaction product of the ozone stream and the exhaust stream comprises: and mixing the reaction product of the ozone stream and the tail gas stream for leaching.

213. Example 213 provided by the invention: the method for ozone purification of tail gas comprising example 212, wherein the method for removing nitric acid from the mixed reaction product of the ozone stream and the tail gas stream further comprises: providing a rinse solution to the mixed reaction product of the ozone stream and the tail gas stream.

214. Example 214 provided by the invention: the method for ozone purification of exhaust gas comprising example 213, wherein the leacheate is water and/or alkali.

215. Example 215 provided by the invention: the exhaust gas ozone purification method comprising any one of examples 152-214, wherein the method of removing nitric acid from a mixed reaction product of the ozone stream and the exhaust stream further comprises: and storing the nitric acid aqueous solution and/or the nitrate aqueous solution removed from the tail gas.

216. Example 216 provided by the invention: including the method of ozone purification of tail gas of example 215, wherein, when the aqueous solution of nitric acid is stored, lye is added to form nitrate with the nitric acid.

217. Example 217 provided by the invention: the exhaust ozone purification method according to any of examples 110 to 216 is included, wherein the exhaust ozone purification method further includes the steps of: and carrying out ozone digestion on the tail gas from which the nitric acid is removed.

218. Example 218 provided by the invention: the exhaust ozone purification method of example 217 is included, wherein the ozone digestion is selected from at least one of ultraviolet digestion and catalytic digestion.

219. Example 219 provided by the invention: the exhaust ozone purification method according to any one of examples 110 to 218, wherein the exhaust ozone purification method further comprises the steps of: removing nitrogen oxides in the tail gas for the first time; and mixing the tail gas stream after the first removal of the nitrogen oxides with the ozone stream for reaction, or mixing the tail gas stream with the ozone stream for reaction before the first removal of the nitrogen oxides in the tail gas.

220. Example 220 provided by the 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 performed by at least one method 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 first schematic view of an electrode for an ozone generator according to the present invention.

FIG. 3 is a second schematic view of an electrode for an ozone generator according to the present invention.

Fig. 4 is a schematic diagram of a discharge type ozone generator in the prior art.

FIG. 5 is a schematic view showing an ozone purification system for engine exhaust gas according to embodiment 1 of the present invention.

FIG. 6 is a top view of the reaction field in the ozone purification system for engine exhaust according to example 1 of the present invention.

FIG. 7 is a schematic view showing an ozone level controlling apparatus according to the present invention.

FIG. 8 is a schematic diagram of the construction of an electrocoagulation apparatus of example 9 of the present invention.

FIG. 9 is a left side view of an electrocoagulation device of 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 of the construction of an electrocoagulation apparatus in example 10 of the present invention.

FIG. 12 is a top plan view of an electrocoagulation device in example 10 of the present invention.

FIG. 13 is a schematic diagram of the construction of an electrocoagulation apparatus of example 11 of the present invention.

FIG. 14 is a schematic diagram of the construction of an electrocoagulation apparatus of example 12 of the present invention.

FIG. 15 is a schematic diagram of the construction of an electrocoagulation apparatus of example 13 of the present invention.

FIG. 16 is a schematic diagram of the construction of an electrocoagulation apparatus of example 14 of the present invention.

FIG. 17 is a schematic diagram of the construction of an electrocoagulation apparatus of example 15 of the present invention.

FIG. 18 is a schematic diagram of the construction of an electrocoagulation apparatus of example 16 of the present invention.

FIG. 19 is a schematic diagram of the construction of an electrocoagulation apparatus of example 17 of the present invention.

FIG. 20 is a schematic diagram of the construction of an electrocoagulation apparatus of example 18 of the present invention.

FIG. 21 is a schematic diagram of the construction of an electrocoagulation apparatus of example 19 of the present invention.

FIG. 22 is a schematic diagram of the construction of an electrocoagulation apparatus of example 20 of the present invention.

FIG. 23 is a schematic diagram of the construction of an electrocoagulation apparatus of example 21 of the present invention.

FIG. 24 is a schematic diagram of the construction of an electrocoagulation apparatus of example 22 of the present invention.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

In an embodiment of the present invention, the engine exhaust gas ozone purification system includes a reaction field for mixing and reacting an ozone stream and an exhaust gas stream. For example: treating the exhaust gas of the automobile engine 210, generating an oxidation reaction by using water in the exhaust gas and the exhaust gas pipeline 220, and oxidizing organic volatile components in the exhaust gas into carbon dioxide and water; collecting sulfur, nitrate and the like in a harmless way. The exhaust gas ozone purification system may further include an external ozone generator 230 for providing ozone to the exhaust gas pipe 220 through an ozone delivery pipe 240, as shown in fig. 1, where the arrow direction is the exhaust gas flowing direction.

The molar ratio of the ozone stream to the tail gas stream can 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.

One embodiment of the present invention may obtain ozone in different ways. For example, the ozone generated by surface discharge is composed of a tubular discharge part, a plate discharge part and an alternating-current high-voltage power supply, air with dust adsorbed by static electricity, water removed and oxygen enriched 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 tubular extended surface discharge structure is used, cooling liquid is introduced into the discharge tube and the outer layer of the discharge tube, electrodes are formed between the inner electrode and the outer tube conductor, 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 surface of the inner tube, oxygen is ionized, and ozone is generated. Ozone is fed into a reaction field such as an off-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 stream to the tail gas stream is 5, the removal rate of VOCs is over 95 percent, then the concentration of nitrogen oxide gas is reduced, and the removal rate of nitrogen oxide is 90 percent; when the molar ratio of the ozone stream to the tail gas stream is greater than 10, the removal rate of VOCs is more than 99%, then the concentration of nitrogen oxide gas is reduced, and the removal rate of nitrogen oxide is 99%. The power consumption increased to 30 w/g.

The ultraviolet lamp tube generates ozone to generate 11-195 nm wavelength ultraviolet for gas discharge, and irradiates the air around the lamp tube directly to generate ozone, high-energy ions and high-energy particles, which are introduced into a reaction field such as a tail gas channel through positive pressure or negative pressure. By lighting the tube using ultraviolet discharge tubes of 172 nm wavelength and 185 nm wavelength, oxygen in the gas at the outer wall of the tube is ionized, producing a large number of oxygen ions, which combine to form ozone. Fed into a reaction field such as a tail gas channel by positive pressure. When the molar ratio of the 185 nanometer ultraviolet ozone stream to the tail gas stream is 2, the removal rate of VOCs is 40%; when the molar ratio of the 185 nanometer ultraviolet ozone stream to the tail gas stream is 5, the removal rate of VOCs is over 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 the 185 nanometer ultraviolet ozone stream to the tail gas stream 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 stream to the tail gas stream is 2, the removal rate of VOCs is 45%; when the molar ratio of the 172-nanometer ultraviolet ozone stream to the tail gas stream is 5, the removal rate of VOCs is more than 89%, then the concentration of nitrogen oxide gas is reduced, and the removal rate of nitrogen oxide is 75%; when the molar ratio of the 172-nanometer ultraviolet ozone stream to the tail gas stream is greater than 10, the removal rate of VOCs is more than 97%, then the concentration of nitrogen oxide gas is reduced, and the removal rate of nitrogen oxide is 95%. The power consumption is 22 w/g.

In one embodiment of the present invention, the reaction field includes 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 time larger than the diameter of the pipeline;

8) the reactor is selected from at least one of:

a third reactor: the reactor comprises a plurality of carrier units, wherein the carrier units provide reaction sites (such as mesoporous ceramic body carriers with honeycomb structures), and the reaction sites are gas phase reaction when the carrier units are not provided, and interface reaction when the carrier units are provided, so that the reaction time is shortened;

9) the reaction field is provided with an ozone inlet, and the ozone inlet is selected from at least one of a nozzle, a spray grid, a nozzle, a swirl nozzle and a nozzle with a venturi tube; spout with venturi: the Venturi tube is arranged in the nozzle and is mixed with ozone by adopting a Venturi principle;

10) the reaction field is provided with an ozone inlet, the ozone enters the reaction field through the ozone inlet and contacts with the tail gas, and the arrangement of the ozone inlet forms at least one of the following directions: the tail gas flow direction is opposite to the tail gas flow direction, is vertical to the tail gas flow direction, is tangential to the tail gas flow direction, is inserted into the tail gas flow direction, and is contacted with the tail gas in multiple directions; the tail gas enters in the opposite direction in the opposite flowing direction, so that the reaction time is prolonged, and the volume is reduced; the direction of the tail gas flow is vertical, and the Venturi effect is used; the tail gas is tangential to the flowing direction of the tail gas, so that the tail gas is convenient to mix; inserting tail gas flow direction to overcome vortex flow; multiple directions, overcoming gravity.

In an embodiment of the present invention, the reaction field includes an exhaust pipe, a heat storage device or a catalyst, and the ozone can clean and regenerate the heat storage, the catalyst and the ceramic body.

In one embodiment of the present invention, the temperature of the reaction field is-50 to 200 ℃, and may be 60 to 70 ℃, 50 to 80 ℃, 40 to 90 ℃, 30 to 100 ℃, 20 to 110 ℃, 10 to 120 ℃, 0 to 130 ℃, -10 to 140 ℃, -20 to 150 ℃, -30 to 160 ℃, -40 to 170 ℃, -50 to 180 ℃, -180 to 190 ℃ or 190 to 200 ℃.

In an embodiment of the present invention, the temperature of the reaction field is 60 to 70 ℃.

In an embodiment of the present invention, the engine exhaust ozone purification system further includes an ozone source for providing an ozone stream. The ozone stream can be either generated immediately for the ozone generator or stored ozone. The reaction field can be in fluid communication with an ozone source, and an ozone stream provided by the ozone source can be introduced into the reaction field so as to be mixed with the exhaust stream and subject the exhaust stream to an oxidation treatment.

In one embodiment of the present invention, the ozone source comprises a storage ozone unit and/or an ozone generator. The ozone source may include an ozone introduction tube and may further include an ozone generator, which may be one or a combination of more than one of an arc ozone generator, i.e., an extended 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-irradiated particle generator, and the like.

In an embodiment of the present invention, the ozone generator includes one or more of an extended-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, and a ray irradiation particle generator.

In an embodiment of the present invention, the ozone generator includes an electrode, and the electrode is provided with a catalyst layer, and the catalyst layer includes an oxidation-catalysis bond-cleavage-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 oxidative catalytic bond cleavage 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 the high voltage electrode 260 of the blocking dielectric layer 270, the oxidative catalytic bond cleavage 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 voltage higher than 500V. The electrode is used as a polar plate for inputting or outputting current in a conductive medium (solid, gas, vacuum or electrolyte solution). One pole of the input current is called anode or positive pole, and the other pole of the output current is called cathode or negative pole.

The discharge type ozone generation mechanism 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 the double bonds of oxygen by using the electric energy of the electric field to generate ozone. The schematic diagram of the existing discharge-type ozone generator is shown in fig. 4, and the discharge-type ozone generator includes 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 double oxygen bonds of the oxygen molecules in the air gap 290 are broken by the electric energy to generate ozone. However, the generation of ozone by using electric field energy is limited, and the current industry standard requires that the power consumption of each kg of ozone does not exceed 8kWh and the average industry level is about 7.5 kWh.

In one embodiment of the present invention, the barrier medium 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. The ceramic plate and the ceramic tube can be made of oxides such as alumina, zirconia, silica and the like or composite oxides thereof.

In an embodiment of the invention, when the electrode includes a high voltage electrode, the thickness of the selective catalyst layer for oxidative catalytic bond cracking is 1-3mm, and the selective catalyst layer for oxidative catalytic bond cracking also serves as a barrier medium, such as 1-1.5 mm or 1.5-3 mm; when the electrode comprises a high-voltage electrode of a barrier dielectric layer, the load of the oxidative catalytic bond cracking selective catalyst layer comprises 1-12 wt% of the barrier dielectric layer, such as 1-5 wt% or 5-12 wt%.

In an embodiment of the present invention, the selective catalyst layer for oxidative catalytic bond cracking comprises the following components by weight percent:

5-15% of active component, such as 5-8%, 8-10%, 10-12%, 12-14% or 14-15%;

85-95% of the coating, such as 85-86%, 86-88%, 88-90%, 90-92% or 92-95%;

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 titanium, manganese, zinc, copper, iron, nickel, cobalt, yttrium, and zirconium.

In an embodiment of the present 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 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 an oxide, a sulfide, a sulfate, a phosphate, a carbonate, and a perovskite.

In an embodiment of the present invention, the porous material is at least one selected from a molecular sieve, diatomaceous earth, zeolite, and carbon nanotubes. The porosity of the porous material is more than 60 percent, such as 60 to 80 percent, the specific surface area is 300-500 square meters/gram, and the average pore diameter is 10 to 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 for cracking the oxidation catalytic bond combines chemical and physical methods, reduces, weakens or even directly breaks the dioxygen bond, fully exerts and utilizes the synergistic effect of an electric field and catalysis, and achieves the purpose 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 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, and the ozone amount control device includes a control unit.

In an embodiment of the present invention, the ozone amount control apparatus further includes a before-ozone-treatment tail gas component detection unit for detecting a content of a before-ozone-treatment tail gas component.

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 tail gas components before the ozone treatment.

In an embodiment of the present invention, the detection unit for detecting components of exhaust gas 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 detection unit for detecting the content of nitrogen oxides, such as Nitrogen Oxides (NO), in the exhaust gas before ozone treatment_x) Sensors, etc.

In an embodiment of the present invention, the control unit controls an amount of ozone required for the mixing reaction according to an output value of at least one of the units for detecting components of exhaust gas before ozone treatment.

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 predetermined mathematical model. The preset mathematical model is related to the content of the tail gas components before the ozone treatment, the amount of the ozone required by the mixing reaction is determined according to the content and the reaction molar ratio of the tail gas components to the ozone, and the amount of the ozone can be increased when the amount of the ozone required by the mixing reaction is determined, so that the ozone is excessive.

In one embodiment of the invention, the control unit is adapted to control the amount of ozone required for the mixing reaction according to a theoretical estimate.

In an embodiment of the present invention, the theoretical estimated value is: the molar ratio of the ozone introduction amount to the to-be-treated substance in the tail gas is 2-10. For example: the 13L diesel engine can control the ozone input amount to be 300-500 g; the 2L gasoline engine can control the ozone input amount to be 5-20 g.

In an embodiment of the present invention, the ozone amount control apparatus includes an ozone-treated exhaust gas component detection unit for detecting the content of the ozone-treated exhaust gas component.

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 present invention, the ozone-treated tail gas component detection unit is selected from at least one of the following detection 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 the ozone treatment;

the second CO detection unit is used for detecting the content of CO in the tail gas after the ozone treatment;

and the second nitrogen oxide detection unit is used for detecting the content of nitrogen oxides in the tail gas after the ozone treatment.

In an embodiment of the present invention, the control unit controls the amount of ozone according to an output value of at least one of the ozone-treated exhaust gas component detection units.

In an embodiment of the present invention, the engine exhaust gas ozone purification system further includes a denitration device for removing nitric acid from a mixed reaction product of the ozone stream and the exhaust stream.

In one embodiment of the invention, the denitrification device comprises an electrocoagulation device comprising: the electrocoagulation flow channel, a first electrode positioned in the electrocoagulation flow channel, and a second electrode.

In an embodiment of the invention, the denitration device includes a condensing unit for condensing the tail gas after the ozone treatment to realize gas-liquid separation.

In an embodiment of the present invention, the denitration device includes a leaching unit, which is used for leaching the tail gas after the ozone treatment, for example: water and/or alkali.

In an embodiment of the invention, the denitration device further includes an elution liquid unit, which is used for providing an elution liquid to the elution unit.

In an embodiment of the present invention, the leacheate in the leacheate unit comprises water and/or alkali.

In an embodiment of the present invention, the denitration apparatus further includes a denitration liquid collecting unit, configured to store the nitric acid aqueous solution and/or the nitrate aqueous solution removed from the tail gas.

In an embodiment of the present invention, when the aqueous solution of nitric acid is stored in the denitration liquid collecting unit, the denitration liquid collecting unit is provided with an alkali solution adding unit for forming nitrate with nitric acid.

In an embodiment of the present invention, the engine exhaust ozone purification system further includes an ozone digestion device for digesting ozone in the exhaust gas treated by the reaction field. The ozone digester can perform ozone digestion in the modes of ultraviolet rays, catalysis and the like.

In an embodiment of the present invention, the ozone digester is at least one selected from an ultraviolet ozone digester and a catalytic ozone digester.

In an embodiment of the present invention, the engine exhaust ozone purification system further includes 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 the 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 realizing denitration in the prior art, for example: at least one of a non-catalytic reduction device (e.g., ammonia denitration), a selective catalytic reduction device (SCR: ammonia plus catalyst denitration), a non-selective catalytic reduction device (SNCR), and an electron beam denitration device, etc. The first denitration device is started after being treatedNitrogen Oxides (NO) in engine exhaust_x) The content of the tail gas is not up to standard, and the tail gas and the ozone stream after or before treatment of the first denitration device can reach the latest standard.

In an embodiment of the present 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.

The person skilled in the art recognizes, based on the prior art: ozone treatment of nitrogen oxide NO in engine exhaust_XNitrogen oxide NO_XIs oxidized by ozone to higher nitrogen oxides such as NO₂、N ₂O ₅And NO₃And the high-valence nitrogen oxides are gases and still cannot be removed from the engine tail gas, namely the nitrogen oxides NO in the engine tail gas are treated by ozone_XHowever, applicants have found that the higher nitrogen oxides produced by the reaction of ozone with the nitrogen oxides in the exhaust gas are not the final products, that the higher nitrogen oxides react with water to produce nitric acid, which is more easily removed from the engine exhaust, such as by electrocoagulation and condensation, an effect that is unexpected to those skilled in the art. This unexpected technical effect is because those skilled in the art do not recognize that ozone will also react with VOCs in the engine exhaust to produce sufficient water and high nitrogen oxides to react to produce nitric acid.

When treating engine exhaust with ozone, ozone is preferentially oxidized to CO by reacting with Volatile Organic Compounds (VOC)₂And water, then with NO_XOxidized to higher nitrogen oxides such as NO₂、N ₂O ₅And NO₃Etc. and finally reacted with CO to be oxidized into CO₂I.e. reaction priority of volatile organic compounds VOC > nitroxide NO_XCO and sufficient water is produced in the tail gas to react with the high-valence nitrogen oxides to produce nitric acidOzone treatment of engine exhaust to remove NO with ozone_XThe effect is better and is an unexpected technical effect for those skilled in the art.

The ozone treatment of the engine tail gas can achieve the following removal effect: nitrogen oxides NO_XRemoving efficiency: 60-99.97%; carbon monoxide CO removal efficiency: 1-50%; volatile organic compound VOC removal efficiency: 60 to 99.97%, which is an unexpected technical effect for those skilled in the art.

Nitric acid obtained by reacting the high-valence nitrogen oxides with water obtained by oxidizing Volatile Organic Compounds (VOC) is easier to remove, and the removed nitric acid can be recycled, for example, the nitric acid can be removed by the electrocoagulation device disclosed by the invention, and can also be removed by a nitric acid removal method in the prior art, such as alkali washing. The electrocoagulation device comprises a first electrode and a second electrode, wherein when the nitric acid-containing water mist flows through the first electrode, the nitric acid-containing water mist is electrified, the second electrode exerts attraction on 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 comprises the following steps: and mixing the ozone stream and the tail gas stream for reaction.

In one embodiment of the present invention, the exhaust stream includes nitrogen oxides and volatile organic compounds. The exhaust stream may be engine exhaust, the engine being typically a device converting chemical energy of a fuel into mechanical energy, in particular an internal combustion engine or the like, more in particular exhaust of e.g. a diesel engine or the like. Nitrogen Oxides (NO) in the exhaust stream_x) Mixed with an ozone stream and oxidized to higher nitrogen oxides such as NO₂、N ₂O ₅And NO₃And the like. Mixing Volatile Organic Compounds (VOC) in the tail gas stream with the ozone stream for reaction and oxidation to CO₂And water. The nitrogen oxide in high valence state and volatile organicThe compound (VOC) is oxidized to obtain water, and the water reacts to obtain nitric acid. The Nitrogen Oxides (NO) in the tail gas stream are obtained through the reaction_x) Is removed and exists in the waste gas in the form of nitric acid.

In one embodiment of the present invention, the ozone stream is mixed with the tail gas stream at the low temperature section of the tail gas.

In an embodiment of the invention, the mixing reaction temperature of the ozone stream and the tail gas stream is-50-200 ℃, and can be 60-70 ℃, 50-80 ℃, 40-90 ℃, 30-100 ℃, 20-110 ℃, 10-120 ℃, 0-130 ℃, -10-140 ℃, -20-150 ℃, -30-160 ℃, -40-170 ℃, -50-180 ℃, -180-190 ℃ or 190-200 ℃.

In an embodiment of the present 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 mixing of the ozone stream and the exhaust stream is selected from at least one of venturi mixing, positive pressure mixing, plunge mixing, dynamic mixing, and fluid mixing.

In an embodiment of the present invention, when the mixing manner of the ozone stream and the exhaust stream is positive pressure mixing, the pressure of the ozone inlet gas is greater than the pressure of the exhaust gas. When the pressure of the ozone stream inlet is less than the exhaust pressure of the exhaust stream, a venturi mixing mode can be used simultaneously.

In one embodiment of the invention, before the mixing reaction of the ozone stream and the tail gas stream, the flow velocity of the tail gas stream is increased, and the ozone stream is mixed by adopting a Venturi principle.

In an embodiment of the present invention, the mixing manner of the ozone stream and the exhaust stream is selected from at least one of the upstream inlet of the exhaust outlet, the mixing of the front section of the reaction field, the front and rear insertion of the dust remover, the front and rear mixing of the denitration device, the front and rear mixing of the catalytic device, the front and rear inlet of the water washing device, the front and rear mixing of the filtering device, the front and rear mixing of the silencing device, the mixing of the exhaust pipeline, the external mixing of the adsorption device and the front and rear mixing of 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 an embodiment of the present invention, the reaction field for mixing and reacting the ozone stream and the exhaust stream includes a pipeline and/or a reactor.

In one embodiment of the present invention, the reaction field includes an exhaust pipe, a heat storage 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 time larger than the diameter of the pipeline;

3) the reactor is selected from at least one of:

4) the reaction field is provided with an ozone inlet, and the ozone inlet is selected from at least one of a nozzle, a spray grid, a nozzle, a swirl nozzle and a nozzle with a venturi tube; spout with venturi: the Venturi tube is arranged in the nozzle and is mixed with ozone by adopting a Venturi principle;

5) the reaction field is provided with an ozone inlet, the ozone enters the reaction field through the ozone inlet and contacts with the tail gas, and the arrangement of the ozone inlet forms at least one of the following directions: the tail gas flow direction is opposite to the tail gas flow direction, is vertical to the tail gas flow direction, is tangential to the tail gas flow direction, is inserted into the tail gas flow direction, and is contacted with the tail gas in multiple directions; the tail gas enters in the opposite direction in the opposite flowing direction, so that the reaction time is prolonged, and the volume is reduced; the direction perpendicular to the flow of the tail gas uses the Vickers effect; the tail gas is tangential to the flowing direction of the tail gas, so that the tail gas is convenient to mix; inserting tail gas flow direction to overcome vortex flow; multiple directions, overcoming gravity.

In one embodiment of the present invention, the ozone stream is provided by a storage ozone unit and/or an ozone generator.

In one embodiment of the present invention, the ozone stream providing method comprises: under the action of an electric field and the oxidation catalytic bond cracking selective catalyst layer, the gas containing oxygen generates ozone, wherein the oxidation catalytic bond cracking selective catalyst layer is loaded on an 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 the high voltage electrode, the oxidative catalytic bond cleavage selective catalyst layer is loaded on a surface of the high voltage electrode, and when the electrode includes the high voltage electrode of the blocking dielectric layer, the oxidative catalytic bond cleavage selective catalyst layer is loaded on a surface of the blocking dielectric layer.

5-15% of active component, such as 5-8%, 8-10%, 10-12%, 12-14% or 14-15%;

85-95% of the coating, such as 85-86%, 86-88%, 88-90%, 90-92% or 92-95%;

In one embodiment of the present invention, the electrode is impregnated and/or sprayed with the oxygen bi-catalytic bond cracking selective catalyst.

In one embodiment of the present invention, the method comprises the following steps:

3) according to the composition ratio of the catalyst, loading the slurry of the coating raw material on the surface of the high-voltage electrode or the surface of the barrier dielectric layer, drying and calcining to obtain the high-voltage electrode or the barrier dielectric layer loaded with the coating;

4) loading a raw material solution or slurry containing a metal element M on the coating obtained in the step 1) according to the composition ratio of the catalyst, drying and calcining, and arranging a high-voltage electrode on the other surface of the blocking dielectric layer opposite to the loading coating after calcining when the coating is loaded on the surface of the blocking dielectric layer to obtain the electrode for the ozone generator; or loading a raw material solution or slurry containing the metal element M on 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 blocking dielectric layer, a high-voltage electrode is arranged on the other surface, opposite to the loading coating, of the blocking dielectric layer after post-treatment, and then the electrode for the ozone generator is obtained;

3) loading a raw material solution or slurry containing a metal element M on a coating raw material according to the composition ratio of the catalyst, drying and calcining to obtain a coating material loaded with an active component;

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 the high-voltage electrode or the surface of the blocking dielectric layer, drying and calcining, and arranging the high-voltage electrode on the other surface of the blocking dielectric layer, which is opposite to the loading coating, after calcining when the coating is loaded on the surface of the blocking dielectric layer, so as to obtain 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 the high-voltage electrode or the surface of the blocking dielectric layer, drying, calcining and post-treating, and arranging the high-voltage electrode on the other surface of the blocking dielectric layer, which is opposite to the loading coating, after post-treatment when the coating is loaded on the surface of the blocking dielectric layer, so as to obtain the electrode for the ozone generator;

The loading mode can be dipping, spraying, brushing and the like, and the loading can be realized.

When the active component comprises at least one of sulfate, phosphate and carbonate of the metal element M, the solution or slurry containing at least one of sulfate, phosphate and carbonate of the metal element M is loaded on the coating raw material, dried and calcined, and the calcination temperature can not exceed the decomposition temperature of the active component, such as: the calcination temperature for obtaining the sulfate of the metal element M should not exceed the decomposition temperature of the sulfate (the decomposition temperature is generally 600 ℃ or higher).

The control of the morphology of the active components in the catalyst for electrodes is achieved by the calcination temperature and atmosphere, and post-treatment, such as: when the active component comprises metal M, the active component can be obtained by reduction (post-treatment) of reducing gas after calcination, and the calcination temperature can be 200-550 ℃; when the active component comprises sulfide of the metal element M, the active component can be obtained by reacting with hydrogen sulfide (post-treatment) after calcination, and the calcination temperature can be 200-550 ℃.

In one embodiment of the present invention, the method includes: the amount of ozone in the ozone stream is controlled so as to effectively oxidize the gaseous components of the exhaust gas to be treated.

In one embodiment of the present invention, the ozone amount of the ozone stream is controlled to achieve the following removal efficiency:

nitrogen oxide removal efficiency: 60-99.97%;

efficiency of CO removal: 1-50%;

volatile organic compound removal efficiency: 60-99.97%.

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 present invention, the amount of ozone required for the mixing reaction is controlled according to the content of the components of the tail gas before the ozone treatment.

In one embodiment of the present invention, the content of the tail gas component before ozone treatment is detected to be at least one selected from the following:

detecting the content of CO 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 for detecting the amount of the component in the exhaust gas before the 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 the ozone treatment, the amount of the ozone required by the mixing reaction is determined according to the content and the reaction molar ratio of the tail gas components to the ozone, and the amount of the ozone can be increased when the amount of the ozone required by the mixing reaction is determined, so that the ozone is excessive.

In one embodiment of the present invention, the amount of ozone required for the mixing reaction is controlled according to a theoretical estimate.

In an embodiment of the present invention, the theoretical estimated value is: the molar ratio of the ozone introduction amount to the object 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 input amount to be 300-500 g; the 2L gasoline engine can control the ozone input amount to be 5-20 g.

In one embodiment of the present invention, the method includes: and detecting the component content of the tail gas after the ozone treatment.

In an embodiment of the present 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 an embodiment of the present invention, the content of the detected tail gas component after ozone treatment is at least one selected from the following components:

detecting the ozone content in the tail gas after ozone treatment;

detecting the content of CO in the tail gas after ozone treatment;

In one embodiment of the present invention, the amount of ozone is controlled according to at least one output value for detecting the content of the ozone-treated exhaust gas component.

In an embodiment of the present invention, the method for purifying exhaust gas with ozone further includes the following steps: and removing nitric acid in the mixed reaction product of the ozone stream and the tail gas stream.

In one embodiment of the present invention, a gas with nitric acid mist is flowed 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 exerts attraction force on 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.

In an embodiment of the present invention, a method for removing nitric acid from a mixed reaction product of an ozone stream and a tail gas stream comprises: and condensing the mixed reaction product of the ozone stream and the tail gas stream.

In an embodiment of the present invention, a method for removing nitric acid from a mixed reaction product of an ozone stream and a tail gas stream comprises: and mixing the reaction product of the ozone stream and the tail gas stream for leaching.

In an embodiment of the present invention, the method for removing nitric acid from a mixed reaction product of an ozone stream and a tail gas stream further includes: providing a rinse solution to the mixed reaction product of the ozone stream and the tail gas stream.

In an embodiment of the present invention, the eluent is water and/or alkali.

In an embodiment of the present invention, the method for removing nitric acid from a mixed reaction product of an ozone stream and a tail gas stream further includes: and storing the nitric acid aqueous solution and/or the nitrate aqueous solution removed from the tail gas.

In one embodiment of the present invention, when the aqueous nitric acid solution is stored, an alkaline solution is added to form nitrate with the nitric acid.

In an embodiment of the present invention, the method for purifying exhaust gas with ozone further includes the following steps: carrying out ozone digestion on the tail gas subjected to nitric acid removal, such as: the digestion may be carried out by means of ultraviolet rays, catalysis, and the like.

In one embodiment of the present invention, the ozone digestion is at least one selected from the group consisting of uv digestion and catalytic digestion.

In an embodiment of the present invention, the method for purifying exhaust gas with ozone further includes the following steps: removing nitrogen oxides in the tail gas for the first time; and mixing the tail gas stream after the first removal of the nitrogen oxides with the ozone stream for reaction, or mixing the tail gas stream with the ozone stream for reaction before the first removal of the nitrogen oxides in the tail gas.

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 a non-catalytic reduction method (e.g., ammonia denitration), a selective catalytic reduction method (SCR: ammonia plus catalyst denitration), a non-selective catalytic reduction method (SNCR), an electron beam denitration method, and the like. Nitrogen Oxides (NO) in engine exhaust after first removal of nitrogen oxides in exhaust_x) The content does not reach the standard, and the nitrogen oxide in the tail gas can reach the latest standard after being removed for the first time or after being mixed and reacted with ozone before being removed for the first time. In an embodiment of the present invention, the first removal of nitrogen oxides from the tail gas is performed by at least one 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.

In one embodiment of the invention there is provided an electrocoagulation device comprising: the electrocoagulation flow channel, a first electrode positioned in the electrocoagulation flow channel, and a second electrode. When the tail gas flow passes through the first electrode in the electrocoagulation flow channel, the water mist containing the nitric acid in the tail gas, namely the nitric acid liquid, is electrified, the second electrode exerts attraction on the electrified nitric acid liquid, and the water mist containing the nitric acid moves to the second electrode until the water mist containing the 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 known as an electrocoagulation demisting device.

In one embodiment of the present invention, the first electrode may be one or a combination of solid, liquid, gas molecular group, plasma, conductive mixed-state substance, natural mixed conductive substance of organism, or artificial processing of object to form conductive substance. When the first electrode is solid, the first electrode may be made of solid metal, such as 304 steel, or other solid conductor, such as graphite; 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, a perforated plate, a needle bar, a ball cage, a box, a tube, a natural form material, a processed form material, or the like. When the first electrode is in a plate shape, a ball cage shape, a box shape or a tubular shape, the first electrode may be a non-porous structure or a porous structure. When the first electrode has a porous structure, one or more front through holes may be formed in the first electrode. In an embodiment of the present invention, the front through hole may have a polygonal shape, a circular shape, an oval shape, a square shape, a rectangular shape, a trapezoidal shape, or a rhombic shape. In an embodiment of the present invention, the aperture size of the front through hole may 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 addition, the first electrode may also be other shapes in other embodiments.

In an embodiment of the invention, the second electrode may be in a shape of a multi-layer mesh, a net, a perforated plate, a tube, a barrel, a ball cage, a box, a plate, a stacked-layer particle, a bent plate, or a panel. When the second electrode is in the form of a plate, a ball cage, a box or a tube, the second electrode may also be of a non-porous structure, or a porous structure. When the second electrode has a porous structure, one or more rear through holes may be formed in the second electrode. In an embodiment of the present invention, the shape of the rear through hole may be polygonal, circular, elliptical, square, rectangular, trapezoidal, or rhombic. The aperture 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 an embodiment of the present invention, the second electrode is made of a conductive material. In an embodiment of the invention, the surface of the second electrode has a conductive material.

In one embodiment of the present invention, an electrocoagulation electric field is provided between the first electrode and the second electrode, and the electrocoagulation electric field can be one or more of a point-surface electric field, a line-surface electric field, a mesh-surface electric field, a point-barrel electric field, a line-barrel electric field, or a mesh-barrel electric field. Such as: the first electrode is in a needle shape or a linear shape, the second electrode is in a planar shape, and the first electrode is vertical to or parallel to the second electrode, so that a linear-planar electric field is formed; or the first electrode is in a net shape, the second electrode is in a plane shape, and the first electrode is parallel to the second electrode, so that a net surface electric field is formed; or the first electrode is in a point 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 point-barrel electric field is formed; or the first electrode is linear and is fixed through a metal wire or a metal needle, the second electrode is barrel-shaped, and the first electrode is positioned on a geometric symmetry axis of the second electrode, so that a linear barrel electric field is formed; or the first electrode is in a net 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 net-barrel electric field is formed. When the second electrode is planar, it may be planar, curved, or spherical. When the first electrode is linear, it may be linear, curved, or circular. The first electrode may also be circular arc shaped. When the first electrode is in a mesh shape, the first electrode may be planar, spherical or in other geometric shapes, and may also be rectangular or irregular. The first electrode may be a point, a real point with a small diameter, a small ball, or a net ball. When the second electrode is barrel-shaped, the second electrode can be further evolved into various box shapes. The first electrode may also be varied to form an electrode and electrocoagulation field layer.

In one embodiment of the present invention, the first electrode is linear, and the second electrode is planar. In one embodiment of the present invention, the first electrode is perpendicular to the second electrode. In one embodiment of the present invention, the first electrode and the second electrode are parallel. In an embodiment of the invention, the first electrode and the second electrode are planar, and the first electrode and the second electrode are parallel. In an embodiment of the present invention, the first electrode is a wire mesh. In an 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 mesh shape, the second electrode is in a barrel shape, the first electrode is located inside the second electrode, and the first electrode is located 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 an embodiment of the invention, 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.

Also, in some embodiments of the invention the first electrode of the electrocoagulation device may have a positive or negative potential; the second electrode has a negative potential when the first electrode has a positive 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 a power supply, and specifically, the first electrode and the second electrode can be respectively electrically connected with the positive electrode and the negative electrode of the power supply. The voltage of the power supply is called power-on driving voltage, and the magnitude of the power-on driving voltage is selected according to the environmental temperature, the medium temperature and the like. For example, the power-on driving voltage range of the power supply can be 5-50KV, 10-50 KV, 5-10 KV, 10-20 KV, 20-30 KV, 30-40 KV or 40-50 KV, and the power supply can be 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 electrical driving voltage thereon 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, an electrifying driving voltage such as the sine wave acts between the first electrode and the second electrode, and the generated electrocoagulation electric field drives charged particles such as fog drops in the electrocoagulation electric field to move towards the second electrode; the oblique wave is used as pulling force, the waveform is modulated according to the pulling force requirement, for example, the pulling force generated to the medium in the asymmetric electrocoagulation electric field has obvious directivity, so that the medium in the electrocoagulation electric field is driven to move along the direction. When the power supply adopts an alternating current power supply, the frequency conversion pulse range can be 0.1Hz-5GHz, 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 method is suitable for adsorbing pollutants from organisms. The first electrode can be used as a lead, when the first electrode is in contact with the water mist containing the nitric acid, positive and negative electrons are directly led into 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 mist containing nitric acid or to the electrode by means of energy fluctuations, so that the first electrode can be kept out of contact with the mist containing nitric acid. The water mist containing nitric acid repeatedly obtains 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 the nitric acid-containing water mist between the first electrode and the second electrode, charging more droplets and eventually reaching the second electrode, thereby forming an electric current, also referred to as an electric drive current. The magnitude of the power-on driving current is related to the ambient temperature, the medium temperature, the electron quantity, the mass of the adsorbate and the escape quantity. For example, as the number of electrons increases, the number of mobile particles, such as droplets, increases, and the current formed by the moving charged particles increases. The more charged substances such as mist droplets are adsorbed per unit time, the larger the current becomes. 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 lower the current. Under the same condition, the higher the ambient temperature is, the faster the speed of the gas particles and the fog drops is, the higher the kinetic energy of the gas particles and the fog drops is, the higher the probability of collision between the gas particles and the fog drops and the first electrode and the second electrode is, the lower the probability of the gas particles and the fog drops being adsorbed by the second electrode is, and therefore the gas particles and the fog drops are escaped. Meanwhile, since the higher the ambient temperature is, the higher the momentum of the gas molecules, droplets, etc., and the more difficult the molecules are to be adsorbed by the second electrode, even if the second electrode is adsorbed, the higher the probability of escaping from the second electrode again, that is, escaping after neutralization, is, the larger the distance between the first electrode and the second electrode is not changed, the power-on driving voltage needs to be increased, and the limit of the power-on driving voltage is to achieve the effect of air breakdown. In addition, the influence of the medium temperature is substantially equivalent to the influence of the ambient temperature. The lower the temperature of the medium is, the less the energy required for exciting the electrification of the medium such as fog drops is, and the smaller the kinetic energy of the medium is, the more easily the medium is adsorbed on the second electrode under the same electrocoagulation electric field force, so that the formed current is larger. The electrocoagulation device has better adsorption effect on cold water mist containing nitric acid. As the concentration of the medium, such as the droplets, increases, the probability that the charged medium will have electron transfer with other medium before colliding with the second electrode is higher, so that the chance of effective electrical neutralization is higher, and the generated current is correspondingly higher; the higher the dielectric concentration, the greater the current that is 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 an embodiment of the 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-starting voltage. The initial corona onset voltage is a minimum voltage value that causes a discharge to occur between the first electrode and the second electrode and ionize the gas. The initial corona voltage may not be the same for different gases, different operating environments, etc. However, it is obvious to those skilled in the art that the initial corona onset voltage is determined for a certain gas and working environment. In an embodiment of the present invention, the power-on driving voltage of the power supply may be 0.1-2 kv/mm. The power-on driving voltage of the power supply is less than the air corona starting voltage.

In an embodiment of the invention, the first electrode and the second electrode both extend along the left-right direction, and the left end of the first electrode is located at the left of the 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 magnitude of the power-on driving voltage between the first electrode and the second electrode, the flow rate of the water mist, the electrification capacity of the water mist containing nitric acid and the like. For example, the distance between the first electrode and the second electrode can be 5-50 mm, 5-10 mm, 10-20 mm, 20-30 mm, 30-40 mm, or 40-50 mm. The greater the separation between the first and second electrodes, the higher the required electrical drive voltage to form a sufficiently powerful electrocoagulation field for driving the charged medium rapidly towards the second electrode to avoid escape of the medium. Under the same condition, the larger the distance between the first electrode and the second electrode is, the closer the first electrode and the second electrode are to the central position along the airflow direction, the faster the material flow speed is; the slower the flow rate of the substance closer to the second electrode; and perpendicular to the direction of the gas flow, the charged medium particles, such as mist particles, increase in distance between the first electrode and the second electrode, and the longer the time that is accelerated by the electrocoagulation electric field without collision, and therefore the greater the velocity of the substance moving in the perpendicular direction before approaching the second electrode. Under the same condition, if the power-on driving voltage is unchanged, the electric coagulation electric field intensity is continuously reduced along with the increase of the distance, and the capacity of charging a medium in the electric coagulation electric field is weaker.

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, there is one adsorption unit. In another embodiment, the number of the adsorption units is multiple, so that more nitric acid solution can be adsorbed by using the multiple adsorption units, thereby improving the efficiency of collecting the nitric acid solution. When a plurality of adsorption units are arranged, the distribution form of all the adsorption units can be flexibly adjusted according to the requirement; all adsorption units may be the same or different. For example, all the adsorption units can be distributed along one 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 the adsorption units can be distributed in a rectangular array or pyramid shape. The first electrode and the second electrode having various shapes described above can be freely combined to form an adsorption unit. For example, the linear first electrode is inserted into the tubular second electrode to form a suction unit, and then combined with the linear first electrode to form a new suction unit, and at this time, the two linear first electrodes can be electrically connected; the new adsorption units are distributed in one or more of the left-right direction, the up-down direction, the oblique direction or the spiral direction. For another example, the first electrode in a linear shape is inserted into the second electrode in a tubular shape to form suction units, and the suction units are distributed in one or more directions of a left-right direction, a vertical direction, an oblique direction, or a spiral direction to form new suction units, and the new suction units are combined with the first electrodes in the above-described various shapes to form new suction units. The distance between the first electrode and the second electrode in the adsorption unit can be adjusted at will to adapt to different working voltages and requirements of adsorbing objects. Different adsorption units can be combined. The same power supply may be used for different adsorption units, or different power supplies may be used. When different power sources are used, the power-on driving voltages of the power sources may be the same or different. In addition, the electrocoagulation device can be provided with a plurality of electrocoagulation devices, and all the electrocoagulation devices can be distributed along one or more directions of the left and right directions, the up and down directions, the spiral directions or the oblique directions.

In one embodiment of the invention, the electrocoagulation device further comprises an electrocoagulation housing, wherein the electrocoagulation housing comprises an electrocoagulation inlet, an electrocoagulation outlet and an electrocoagulation flow channel, and two ends of the electrocoagulation flow channel are respectively communicated with the electrocoagulation inlet and the electrocoagulation outlet. In one embodiment of the invention, the electrocoagulation inlet is circular, and the diameter of the electrocoagulation inlet is 300-1000mm, or 500 mm. In one embodiment of the invention, the electrocoagulation outlet is circular, and the diameter of the electrocoagulation outlet is 300-1000mm, or 500 mm. In one 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 one embodiment of the invention the first housing section has a profile which increases in size from the electrocoagulation inlet to the electrocoagulation outlet. In an embodiment of the present invention, the first housing portion is a straight tube. In an embodiment of the present invention, the second housing portion is in a straight tube shape, and the first electrode and the second electrode are installed in the second housing portion. In one embodiment of the invention the third housing section has a profile which decreases in size from the electrocoagulation inlet to the electrocoagulation outlet. In an embodiment of the present invention, the first, second, and third housing portions have rectangular cross sections. 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, foamed iron, or foamed silicon carbide. In one embodiment of the invention the first electrode is connected to the electrocoagulation housing by electrocoagulation insulation. In one embodiment of the present invention, the electrocoagulation insulating member is made of insulating mica. In one embodiment of the invention the electrocoagulation insulating member is in the form of a column, or a tower. In one embodiment of the present invention, the first electrode is provided with a cylindrical front connection part, and the front connection part 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 to the electrocoagulation insulating member.

In one embodiment of the invention the first electrode is located in the electrocoagulation flow path. In one embodiment of the present invention, the ratio of the cross-sectional area of the first electrode to the cross-sectional area of the electrocoagulation flow channel is 99% -10%, or 90-10%, or 80-20%, or 70-30%, or 60-40%, or 50%. The cross-sectional area of the first electrode refers to the sum of the areas of the first electrode along the solid portions of the cross-section.

During the process of collecting the water mist containing the nitric acid, the water mist containing the nitric acid enters the electrocoagulation housing from the electrocoagulation inlet and moves towards the electrocoagulation outlet; during the movement of the water mist containing nitric acid towards the electrocoagulation outlet, the water mist containing nitric acid will pass through the first electrode and be electrified; the second electrode adsorbs the charged mist containing nitric acid to collect the mist containing nitric acid on the second electrode. The tail gas and the water mist containing the nitric acid are guided to flow through the first electrode by the electrocoagulation shell, so that the water mist of the nitric acid is electrified by the first electrode, and the water mist of the nitric acid is collected by the second electrode, so that the water mist of the nitric acid flowing out of the electrocoagulation outlet is effectively reduced. In some embodiments of the present invention, the electrocoagulation housing may be made of metal, nonmetal, conductive, nonconductive, water, various conductive liquids, various porous materials, or various foam materials. When the electrocoagulation casing is made of metal, the material can be stainless steel, aluminum alloy or the like. When the electrocoagulation casing is made of non-metal material, the material can be cloth or sponge. When the material of the electrocoagulation housing is a conductor, the material may be iron alloy. When the electrocoagulation casing is made of non-conductor, water layer formed on the surface of the electrocoagulation casing becomes an electrode, such as a sand layer after water absorption. When the electrocoagulation housing is made of water and various conductive liquids, the electrocoagulation housing is static or flowing. When the electrocoagulation shell is made of various porous materials, the electrocoagulation shell can be made of molecular sieves or activated carbon. When the electrocoagulation shell is made of various foam materials, the electrocoagulation shell can be made of foam iron, foam silicon carbide and the like. In one embodiment the first electrode is secured to the electrocoagulation housing by electrocoagulation insulation which may be of insulating mica. Also, in one embodiment, the second electrode is in direct electrical communication with the electrocoagulation housing in a manner such that the electrocoagulation housing is at the same electrical potential as the second electrode, so that the electrocoagulation housing also adsorbs the charged nitric acid-containing water mist, the electrocoagulation housing also forming a second electrode. The electrocoagulation shell is internally provided with the electrocoagulation flow channel, and the first electrode is arranged in the electrocoagulation flow channel.

When the mist containing nitric acid adheres to the second electrode, condensation will form. In some embodiments of the present invention, the second electrode may extend in an up-and-down direction, such 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 be collected in a set position or device, thereby recovering the nitric acid solution attached to the second electrode. The electrocoagulation device can be used for refrigeration and demisting. Alternatively, the species attached to the second electrode may be collected by applying an electrocoagulation field. The material collecting direction on the second electrode can be the same as the air flow or different from the air flow. In the specific implementation, the gravity action is fully utilized, so that water drops or a water layer on the second electrode flows into the collecting tank as soon as possible; at the same time, the speed of the water flow on the second electrode is accelerated by utilizing the direction of the air flow and the acting force thereof as much as possible. Therefore, the above objects can be achieved as much as possible according to different installation conditions, convenience, economy, feasibility and the like of insulation, regardless of specific directions.

In addition, the existing electrostatic field charging theory is that corona discharge is utilized to ionize oxygen, a large amount of negative oxygen ions are generated, the negative oxygen ions are contacted with dust, the dust is charged, and the charged dust is adsorbed by heteropoles. However, when the material meets low specific resistance substances such as water mist containing nitric acid, the existing electric field adsorption effect is almost not good. 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 move only once, so that the low-specific-resistance substance such as water mist containing nitric acid is difficult to charge after losing electricity, or the charging mode greatly reduces the probability of charging the low-specific-resistance substance, the whole low-specific-resistance substance is in an uncharged state, so that the heteropole is difficult to continuously exert the adsorption force on the low-specific-resistance substance, and finally the adsorption efficiency of the existing electric field on the low-specific-resistance substance such as the water mist containing nitric acid is extremely low. According to the electrocoagulation device and the electrocoagulation method, the water mist is not electrified in a charging mode, electrons are directly transmitted to the water mist containing the nitric acid to be electrified, after certain fog drops are electrified and lose electricity, new electrons are quickly transmitted to the fog drops losing electricity through the first electrode and other fog drops, so that the fog drops can be quickly electrified after losing electricity, the electrification probability of the fog drops is greatly increased, if repeated, the fog drops are wholly in an electrified state, attraction can be continuously exerted on the fog drops by the second electrode until the fog drops are adsorbed, and therefore the electrocoagulation device is guaranteed to be higher in collection efficiency of the water mist containing the nitric acid. The method for electrifying the fog drops does not need corona wires, corona electrodes, corona plates or the like, simplifies the integral structure of the electrocoagulation device, and reduces the manufacturing cost of the electrocoagulation device. Meanwhile, the invention adopts the electrification mode, so that a large amount of electrons on the first electrode are transferred to the second electrode through the fog drops, and current is formed. When the concentration of the water mist flowing through the electrocoagulation device is higher, electrons on the first electrode are easier to transfer to the second electrode through the water mist containing nitric acid, more electrons are transferred among the droplets, so that the current formed between the first electrode and the second electrode is higher, the electrification probability of the droplets is higher, and the collection efficiency of the electrocoagulation device on the water mist is higher.

In one embodiment of the present invention, there is provided an electrocoagulation demisting method comprising the steps of:

flowing a mist-laden gas 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 exerts attraction force on the charged water mist, so that the water mist moves towards the second electrode until the water mist is attached to the second electrode.

In one embodiment of the invention, the first electrode guides electrons into the water mist, and the electrons are transmitted among the droplets between the first electrode and the second electrode, so that more droplets are charged.

In one embodiment of the present invention, electrons are conducted between the first electrode and the second electrode through the water mist, and an electric current is generated.

In one embodiment of the invention, the first electrode charges the mist by contacting the mist.

In an embodiment of the invention, the first electrode charges the mist by means of energy fluctuation.

In an embodiment of the present invention, the water mist attached to the second electrode forms water droplets, and the water droplets on the second electrode flow into the collecting tank.

In one embodiment of the present invention, water droplets on the second electrode flow into the collection trough under the action of gravity.

In one embodiment of the present invention, when the gas flows, the blowing water drops flow into the collecting tank.

In one embodiment of the present invention, the first electrode introduces electrons into the nitric acid mist, and the electrons are transferred between the droplets between the first electrode and the second electrode, so that more droplets are charged.

In one embodiment of the present invention, electrons are conducted between the first electrode and the second electrode through the nitric acid mist, and an electric current is generated.

In one embodiment of the invention, the first electrode is in contact with the nitric acid mist to charge the nitric acid mist.

In an embodiment of the present invention, the first electrode charges the nitric acid mist by means of energy fluctuation.

In one embodiment of the present invention, 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.

Example 1

An engine exhaust ozone purification system, as shown in fig. 5, comprises:

an ozone source 201 for providing an ozone stream that is generated instantaneously for the ozone generator.

And a reaction field 202 for mixing and reacting the ozone stream and the tail gas stream.

The denitration device 203 is used for removing nitric acid in a mixed reaction product of the ozone stream and the tail gas stream; the de-nitrification apparatus 203 includes an electrocoagulation apparatus 2031 for electrocoagulation of the ozone treated engine exhaust, and the water mist containing nitric acid is deposited on a second electrode in the electrocoagulation apparatus. The denitration device 203 further includes a denitration liquid collecting unit 2032 for storing the aqueous nitric acid solution and/or the aqueous nitrate solution removed from the exhaust gas; when the aqueous solution of nitric acid is stored in the denitration liquid collecting unit, the denitration liquid collecting unit is provided with an alkali liquor adding unit for forming nitrate with the nitric acid.

And the ozone digester 204 is used for digesting the ozone in the tail gas treated by the reaction field. The ozone digester can perform ozone digestion by means of ultraviolet rays, catalysis and the like.

The reaction field 202 is a second reactor, and as shown in fig. 6, a plurality of honeycomb-shaped cavities 2021 are arranged in the second reactor, and are used for providing a space for mixing and reacting the tail gas and the ozone; gaps 2022 are arranged between the honeycomb cavities and used for introducing cold media and controlling the reaction temperature of the tail gas and the ozone, and the arrow on the right side in the figure is a refrigerant inlet, and the arrow on the left side in the figure is a refrigerant outlet.

The electrocoagulation device comprises:

a first electrode 301 capable of conducting electrons to water mist (low specific resistance substance) containing nitric acid; when the electrons are conducted to the water mist containing the nitric acid, the water mist containing the nitric acid is electrified;

and a second electrode 302 capable of applying an attractive force to the charged nitric acid-containing mist.

In this embodiment, there are two first electrodes 301, and the two first electrodes 301 are both mesh-shaped and ball-cage-shaped. In one of the second electrodes 302 in this embodiment, 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. Also, as shown in FIG. 11, the electrocoagulation device in this embodiment further comprises a housing 303 having an inlet 3031 and an outlet 3032, the first electrode 301 and the second electrode 302 being mounted in the housing 303. The first electrode 301 is fixedly connected with the inner wall of the housing 303 through an insulating member 304, and the second electrode 302 is directly fixedly connected with the housing 303. In the embodiment, the insulating member 304 is a column, 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, the outer shell 303 and the second electrode 302 have the same potential in this embodiment, and the outer shell 303 also has an adsorption effect on the charged substances.

The electrocoagulation device in the embodiment is used for treating industrial tail gas containing acid mist. In this embodiment, the inlet 3031 is in communication with a port for discharging industrial exhaust. The working principle of the electrocoagulation device in the embodiment is as follows: industrial tail gas flows into the shell 303 from an inlet 3031 and flows out from an outlet 3032; in the process, the industrial exhaust gas firstly flows through one of the first electrodes 301, when the acid mist in the industrial exhaust gas contacts with the first electrode 301 or the distance between the industrial exhaust gas and the first electrode 301 reaches a certain value, the first electrode 301 transfers electrons to the acid mist, part of the acid mist is charged, the second electrode 302 exerts attraction force on the charged acid mist, and the acid mist moves to the second electrode 302 and is attached to the second electrode 302; another part of the acid mist is not adsorbed on the second electrode 302, the part of the acid mist continuously flows towards the outlet 3032, when the part of the acid mist contacts another first electrode 301 or reaches a certain distance from another first electrode 301, the part of the acid mist is charged, and the shell 303 applies an adsorption force to the part of the charged acid mist, so that the part of the charged acid mist is attached to the inner wall of the shell 303, thereby greatly reducing the emission of the acid mist in the industrial exhaust gas, and the treatment device in the embodiment can remove 90% of the acid mist in the industrial exhaust gas, and the effect of removing the acid mist is very significant. In addition, in this embodiment, the inlet 3031 and the outlet 3032 are both circular, and the inlet 3031 may also be referred to as an air inlet, and the outlet 3032 may also be referred to as an air outlet.

Example 2

As shown in fig. 7, the engine exhaust ozone purification system in embodiment 1 further includes an ozone amount control device 209 for controlling the amount of ozone so as to effectively oxidize the gas components to be treated in the exhaust gas, and the ozone amount control device 209 includes a control unit 2091. The ozone amount control device 209 further includes a before-ozone-treatment tail gas component detection unit 2092 configured to detect the before-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 components in the tail gas before the ozone treatment.

The tail gas component detection unit before ozone treatment is selected from at least one of the following detection units:

a first voc detection unit 20921, configured to detect the content of the volatile organic compound in the exhaust gas before the ozone treatment, such as a volatile organic compound sensor;

a first CO detection unit 20922 for detecting the CO content in the exhaust gas before ozone treatment, such as a CO sensor;

a first nitrogen oxide detection unit 20923 for detecting the content of nitrogen oxide, such as Nitrogen Oxide (NO), in the exhaust gas before ozone treatment_x) Sensors, etc.

The control unit controls the ozone amount required by the mixing reaction according to the output value of at least one tail gas component detection unit before ozone treatment.

The control unit is used for controlling the amount of ozone required by the mixed reaction according to a theoretical estimated value. The theoretical estimated value is: the molar ratio of the ozone introduction amount to the to-be-treated substance in the tail gas is 2-10.

The ozone amount control device includes an ozone-treated tail gas component detection unit 2093, which is configured to detect the content of the ozone-treated tail gas component. And the control unit controls the amount of ozone required by the mixing reaction according to the content of the components in the tail gas after the ozone treatment.

The ozone-treated tail gas component detection unit is selected from at least one of the following detection units:

the first ozone detection unit 20931 is configured to detect the ozone content in the ozone-treated tail gas;

a second voc detection unit 20932, configured to detect the content of the volatile organic compound in the ozone-treated exhaust gas;

the second CO detection unit 20933 is used for detecting the content of CO in the tail gas after ozone treatment;

and a second nitrogen oxide detection unit 20934 is configured to detect the content of nitrogen oxide in the ozone-treated exhaust gas.

The control unit controls the ozone amount according to the output value of at least one ozone-treated tail gas component detection unit.

Example 3

Preparing 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 barrier dielectric layer;

the catalyst (containing a coating and active components) is coated on one surface of the barrier dielectric layer, after the catalyst is coated, the mass of the catalyst is 12% of that of the barrier dielectric layer, and the catalyst comprises the following components in percentage by weight: the coating comprises 12 wt% of active components and 88 wt% of a coating, wherein the active components comprise cerium oxide and zirconium oxide (the amount ratio of the substances in sequence is 1: 1.3), and the coating is gama alumina;

and pasting a copper foil on the other surface of the barrier dielectric layer coated with the catalyst to manufacture the electrode.

The catalyst coating method comprises the following steps:

(1) 200g of 800-mesh gamma 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 poured into an agate mill. 1300g of deionized water were added. Milling was carried out at 200rpm/min for 10 hours. Preparing slurry;

(2) and (3) putting the barrier medium layer into an oven, drying for 2 hours at 150 ℃, and turning on an oven fan during drying. Then keeping the oven door closed and cooling to room temperature;

(3) and (3) loading the catalyst slurry into a high-pressure spray gun, and uniformly spraying the catalyst slurry on the surface of the dried barrier dielectric layer. Drying in vacuum drier for 2 hr;

(4) drying in the shade, and heating in muffle to 550 deg.C at a heating rate of 5 deg.C per minute. Keeping the temperature for two hours, keeping the furnace door closed, and naturally cooling to room temperature. The coating process is complete.

In the same manner, 4 electrodes were prepared. The prepared electrodes were replaced with 4 of the ozone generators of model XF-B-3-100, Dino environmental protection science and technology, Inc. in Henan. Carrying out comparison tests under the following test conditions: the pure oxygen source has the air inlet pressure of 0.6MPa, the air inlet quantity of 1.5 cubic meters per hour, the alternating voltage, and the sine wave of 5000V and 2 kilohertz. And calculating the ozone generation amount per hour according to the detection results of the air outlet volume and the mass concentration.

The experimental results are as follows:

the amount of XF-B-3-100 type primary ozone generated is 120 g/h; after the electrode was replaced, the amount of ozone generated was 160 g/hr under the same test conditions. Under the experimental conditions, the power loss is 830W.

Example 4

Preparing an electrode for an ozone generator:

the catalyst (containing a coating and active components) is coated on one surface of the barrier dielectric layer, after the catalyst is coated, the mass of the catalyst is 5% of that of the barrier dielectric layer, and the catalyst comprises the following components in percentage by weight: the active component accounts for 15 wt% of the total weight of the catalyst, and the coating is 85%, wherein the active component is MnO and CuO, and the coating is gamma alumina;

The catalyst coating method comprises the following steps:

(1) 200g of 800-mesh gamma alumina powder, 4g of oxalic acid, 5g of pseudo-boehmite, 1g of aluminum nitrate and 0.5g of surfactant (for decomposition) are poured into an agate mill. 1300g of deionized water were added. Milling was carried out at 200rpm/min for 10 hours. Preparing slurry;

(2) and (3) putting the barrier medium layer into an oven, drying for 2 hours at 150 ℃, and turning on an oven fan during drying. Then cooled to room temperature with the oven door closed. Measuring the water absorption (A) of the barrier dielectric layer by measuring the mass change before and after drying;

(3) and (3) loading the slurry into a high-pressure spray gun, and uniformly spraying the slurry on the surface of the dried barrier dielectric layer. Drying in vacuum drier for 2 hr;

(4) drying in the shade, and heating in muffle to 550 deg.C at a heating rate of 5 deg.C per minute. Keeping the temperature for two hours, keeping the furnace door closed, and naturally cooling to room temperature. And (5) weighing.

(5) And (3) immersing the barrier medium layer loaded with the coating into water for 1 minute, then taking out, blowing off surface floating water, and weighing. Calculating to obtain the water absorption capacity (B);

(6) the net water uptake of the coating, C, (C ═ B-a) was calculated. And calculating the concentration of the aqueous solution of the active component according to the target loading of the active component and the net water absorption C of the coating. Thus preparing an active component solution; (active component target load CuO0.1g; MnO0.2g)

(7) And drying the barrier dielectric layer loaded with the coating at 150 ℃ for 2 hours, and cooling to room temperature under the condition that the oven door is closed. The surface without loading active components is protected from water.

(8) And (4) loading the prepared active component solution (copper nitrate and manganese nitrate) in the coating by using a dipping method, and blowing off surface floating liquid. Drying for 2 hours at 150 ℃. And transferring the mixture into a muffle furnace for roasting. Heating to 550 deg.C at 15 deg.C per minute, and holding for 3 hr. Slightly opening the furnace door, and cooling to room temperature. The coating process is complete.

The experimental results are as follows:

the amount of XF-B-3-100 type primary ozone generated is 120 g/h; after the electrode was replaced, the amount of ozone generated was 168 g/hr under the same test conditions. Under the experimental conditions, the power loss is 830W.

Example 5

Preparing 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 dielectric layer;

the catalyst (containing a coating and active components) is coated on one surface of the barrier dielectric layer, after the catalyst is coated, the mass of the catalyst is 1% of that of the barrier dielectric layer, and the catalyst comprises the following components in percentage by weight: the coating comprises 5 wt% of active components and 95 wt% of a coating, wherein the active components are silver, rhodium, platinum, cobalt and lanthanum (the mass ratio of the active components to the lanthanum is 1: 1: 1: 2: 1.5), and the coating is zirconium oxide;

The catalyst coating method comprises the following steps:

(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 poured into an agate mill. 1500g of deionized water were added. Milling was carried out at 200rpm/min for 10 hours. Preparing slurry;

(4) drying in the shade, and heating in muffle to 550 deg.C at a heating rate of 5 deg.C per minute. Keeping the temperature for two hours, keeping the furnace door closed, and naturally cooling to room temperature; the reduction was then carried out at 220 ℃ for 1.5 hours under a hydrogen reducing atmosphere. The coating process is complete.

The experimental results are as follows:

the amount of XF-B-3-100 type primary ozone generated is 120 g/h; after the electrode was replaced, the amount of ozone generated was 140 g/hr under the same test conditions. Under the experimental conditions, the power loss is 830W.

Example 6

Preparing an electrode for an ozone generator:

the catalyst (containing a coating and active components) is coated on one side of a copper foil (electrode), after the catalyst is coated, the thickness of the catalyst is 1.5mm, and the catalyst comprises the following components in percentage by weight: the coating comprises 8 wt% of active components and 92 wt% of a coating, wherein the active components comprise zinc sulfate, calcium sulfate, titanium sulfate and magnesium sulfate (the mass ratio of the active components to the magnesium sulfate is 1: 2: 1: 1), and the coating is graphene.

The catalyst coating method comprises the following steps:

(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 poured into an agate mill. An additional 800g of deionized water was added. Milling was carried out at 200rpm/min for 10 hours. Preparing slurry;

(2) the catalyst slurry was charged through a high-pressure spray gun and uniformly sprayed onto the surface of a copper foil (electrode). Drying in vacuum drier for 2 hr;

(3) after drying in the shade, the mixture is put into a muffle to be heated to 350 ℃, and the heating speed is 5 ℃ per minute. Keeping the temperature for two hours, keeping the furnace door closed, and naturally cooling to room temperature.

The experimental results are as follows:

the amount of XF-B-3-100 type primary ozone generated is 120 g/h; after the electrode was replaced, the amount of ozone generated was 165 g/hr under the same test conditions. Under the experimental conditions, the power loss is 830W.

Example 7

Preparing an electrode for an ozone generator:

the catalyst (containing a coating and active components) is coated on one surface 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 10 wt% of active components and 90 wt% of a coating, wherein the active components comprise praseodymium oxide, samarium oxide and yttrium oxide (the quantity ratio of the substances in sequence is 1: 1: 1), and the coating comprises cerium oxide and manganese oxide (the quantity ratio of the substances in sequence is 1: 1).

The catalyst coating method comprises the following steps:

(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) are poured into an agate mill. An additional 800g of deionized water was added. Milling was carried out at 200rpm/min for 10 hours. Preparing slurry;

(3) drying in the shade, putting into a muffle, heating to 500 ℃, and heating at a heating rate of 5 ℃ per minute. Keeping the temperature for two hours, keeping the furnace door closed, and naturally cooling to room temperature.

The experimental results are as follows:

the amount of XF-B-3-100 type primary ozone generated is 120 g/h; after the electrode was replaced, the amount of ozone generated was 155 g/hr under the same test conditions. Under the experimental conditions, the power loss is 830W.

Example 8

Preparing an electrode for an ozone generator:

the catalyst (containing a coating and active components) is coated on one surface of a copper foil (electrode), after the catalyst is coated, the thickness of the catalyst is 1mm, and the catalyst comprises the following components in percentage by weight: the coating comprises 14 wt% of active components and 86 wt% of a coating, wherein the active components comprise strontium sulfide, nickel sulfide, tin sulfide and iron sulfide (the mass ratio of the active components to the iron sulfide 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.

The catalyst coating method comprises the following steps:

(1) 58g of diatomite, 3.66g of strontium sulfate, 2.63g of nickel sulfate, 2.18g of stannous sulfate, 2.78g of ferrous sulfate, 3g of oxalic acid and 5g of EDTA (for decomposition) are poured into an agate mill. An additional 400g of deionized water was added. Milling was carried out at 200rpm/min for 10 hours. Preparing slurry;

(3) drying in the shade, putting into a muffle, heating to 500 ℃, and heating at a heating rate of 5 ℃ per minute. Keeping the temperature for two hours, keeping the furnace door closed, and naturally cooling to room temperature; then CO is introduced to carry out vulcanization reaction, and the coating process is finished.

The experimental results are as follows:

Example 9

As shown in fig. 8 to 10, the present embodiment provides an electrocoagulation apparatus comprising:

a first electrode 301 capable of conducting electrons to the nitric acid-containing water mist; when electrons are conducted to the mist of nitric acid, the mist of nitric acid is charged;

and a second electrode 302 capable of applying an attractive force to the charged mist.

Also, as shown in FIG. 8, the electrocoagulation device in this embodiment further comprises an electrocoagulation housing 303 having an electrocoagulation inlet 3031 and an electrocoagulation outlet 3032, the first electrode 301 and the second electrode 302 each being mounted in the electrocoagulation housing 303. And the first electrode 301 is fixedly connected with the inner wall of the electrocoagulation shell 303 through an electrocoagulation insulating part 304, and the second electrode 302 is directly and fixedly connected with the electrocoagulation shell 303. The electrocoagulation insulator 304 in this embodiment is in the form of a column, also referred to as an insulating column. In another embodiment the electrocoagulation insulation 304 may also be in the form of a tower or the like. The electrocoagulation insulator 304 is mainly anti-pollution and anti-creepage. In this embodiment the first electrode 301 and the second electrode 302 are both mesh-shaped and both are 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, in the embodiment where the electrocoagulation housing 303 has the same electrical potential as the second electrode 302, the electrocoagulation housing 303 also has an adsorption effect on charged species. In the embodiment, an electrocoagulation channel 3036 is arranged in the electrocoagulation housing, the first electrode 301 and the second electrode 302 are both arranged 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 99-10%, or 90-10%, or 80-20%, or 70-30%, or 60-40%, or 50%.

The electrocoagulation device in this embodiment may also be used to treat industrial off-gas containing acid mist. When the electrocoagulation device is used to treat 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 principle of operation of the electrocoagulation device of this embodiment is as follows: the industrial tail gas flows into the electrocoagulation shell 303 from the electrocoagulation inlet 3031 and flows out through the electrocoagulation outlet 3032; in the process, the industrial exhaust gas flows through the first electrode 301, when the acid mist in the industrial exhaust gas contacts the first electrode 301 or the distance between the industrial exhaust gas and the first electrode 301 reaches a certain value, the first electrode 301 transfers electrons to the acid mist, the acid mist is charged, the second electrode 302 exerts attraction force on the charged acid mist, and the acid mist moves towards the second electrode 302 and is attached to the second electrode 302; because the acid mist has the characteristics of easy carrying and volatile electricity, certain charged fog drops lose electricity in the process of moving to the second electrode 302, other charged fog drops quickly transfer electrons to the fog drops losing electricity, and the process is repeated, the fog drops are in a continuous charged state, the second electrode 302 can continuously apply adsorption force to the fog drops, and the fog drops are attached to the second electrode 302, so that the acid mist in the industrial tail gas is removed, the acid mist is prevented from being directly discharged to the atmosphere, and the atmosphere is prevented from being polluted. The first electrode 301 and the second electrode 302 described above constitute an adsorption unit in this embodiment. And under the condition that only one adsorption unit is provided, the electrocoagulation device can remove 80% of acid mist in industrial tail gas, greatly reduces the discharge amount of the acid mist, and has a remarkable environment-friendly effect.

As shown in FIG. 10, in this embodiment, 3 front connecting portions 3011 are provided on the first electrode 301, and the 3 front connecting portions 3011 are respectively fixed to 3 connecting portions on the inner wall of the electrocoagulation housing 303 through 3 electrocoagulation insulating members 304, which can effectively enhance the connecting strength between the first electrode 301 and the electrocoagulation housing 303. The front connecting portion 3011 is cylindrical in this embodiment, and the front connecting portion 3011 may be tower-shaped in other embodiments. The electrocoagulation insulation member 304 is cylindrical in this embodiment, but in other embodiments the electrocoagulation insulation member 304 may also be in the form of a tower or the like. The rear connection portion is cylindrical in this embodiment, and the electrocoagulation insulation member 304 may also be in the shape of a tower or the like in other embodiments. As shown in FIG. 9, the electrocoagulation housing 303 of this embodiment includes a first housing portion 3033, a second housing portion 3034, and a third housing portion 3035 which are arranged in sequence 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 profile that gradually increases in size from the electrocoagulation inlet 3031 to the electrocoagulation outlet 3032, and the third housing portion 3035 has a profile that gradually decreases in size 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 gas flow distribution is more uniform, and further, the media in the tail gas, such as mist drops, are more easily electrified under the excitation action of the first electrode 301. Meanwhile, the electrocoagulation 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 which achieves the above described results is acceptable.

In this embodiment, the electrocoagulation inlet 3031 and the electrocoagulation outlet 3032 are both circular, the electrocoagulation inlet 3031 may also be referred to as a gas inlet, and the electrocoagulation outlet 3032 may also be referred to as a gas outlet. In this embodiment, the diameter of the electrocoagulation inlet 3031 is 300mm to 1000mm, specifically 500 mm. Meanwhile, the diameter of the electrocoagulation inlet 3031 in the embodiment is 300 mm-1000 mm, specifically 500 mm.

Example 10

As shown in FIGS. 11 and 12, the present embodiment provides an electrocoagulation device comprising:

a first electrode 301 capable of conducting electrons to the nitric acid-containing water mist; when the electrons are conducted to the water mist containing the nitric acid, the water mist containing the nitric acid is electrified;

As shown in fig. 11 and 12, in the present embodiment, there are two first electrodes 301, and each of the two first electrodes 301 is mesh-shaped and has a ball cage shape. In one of the second electrodes 302 in this embodiment, 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. Also, as shown in FIG. 11, the electrocoagulation device of this embodiment further comprises an electrocoagulation housing 303 having an electrocoagulation inlet 3031 and an electrocoagulation outlet 3032, the first electrode 301 and the second electrode 302 each being mounted in the electrocoagulation housing 303. And the first electrode 301 is fixedly connected with the inner wall of the electrocoagulation shell 303 through an electrocoagulation insulating part 304, and the second electrode 302 is directly and fixedly connected with the electrocoagulation shell 303. The electrocoagulation insulator 304 in this embodiment is in the form of a column, also referred to as 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 the embodiment where the electrocoagulation housing 303 has the same electrical potential as the second electrode 302, the electrocoagulation housing 303 also has an adsorption effect on charged species.

The electrocoagulation device of this embodiment may also be used to treat industrial off-gas containing acid mist. In this embodiment the electrocoagulation inlet 3031 may be in communication with a port for discharging industrial off-gas. As shown in FIG. 11, the principle of operation of the electrocoagulation device of this embodiment is as follows: the industrial tail gas flows into the electrocoagulation shell 303 from the electrocoagulation inlet 3031 and flows out through the electrocoagulation outlet 3032; in the process, the industrial exhaust gas firstly flows through one of the first electrodes 301, when the acid mist in the industrial exhaust gas contacts with the first electrode 301 or the distance between the industrial exhaust gas and the first electrode 301 reaches a certain value, the first electrode 301 transfers electrons to the acid mist, part of the acid mist is charged, the second electrode 302 exerts attraction force on the charged acid mist, and the acid mist moves to the second electrode 302 and is attached to the second electrode 302; when the part of the acid mist is contacted with the other first electrode 301 or reaches a certain distance from the other first electrode 301, the part of the acid mist is charged, the electrocoagulation housing 303 applies an adsorption force to the part of the charged acid mist, so that the part of the charged acid mist is attached to the inner wall of the electrocoagulation housing 303, the discharge amount of the acid mist in the industrial tail gas is greatly reduced, and the treatment device in the embodiment can remove 90% of the acid mist in the industrial tail gas, so that the effect of removing the acid mist is very obvious. In addition, in the present embodiment, the electrocoagulation inlet 3031 and the electrocoagulation outlet 3032 are both circular, the electrocoagulation inlet 3031 may also be referred to as a gas inlet, and the electrocoagulation outlet 3032 may also be referred to as a gas outlet.

Example 11

As shown in FIG. 13, the present embodiment provides an electrocoagulation device comprising:

In this embodiment, the first electrode 301 has a needle shape, and the first electrode 301 has a negative potential. Meanwhile, in the embodiment, the second electrode 302 is planar, and the second electrode 302 is charged with a positive potential, and the second electrode 302 is also referred to as a collector. In this embodiment, the second electrode 302 is planar, and the first electrode 301 is perpendicular to the second electrode 302. In this embodiment, a line-surface 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 the nitric acid-containing water mist; when electrons are conducted to the mist containing nitric acid, the mist containing nitric acid is charged;

In this embodiment, the first electrode 301 is linear, and the first electrode 301 has a negative potential. Meanwhile, in the embodiment, the second electrode 302 is planar, and the second electrode 302 is charged with a positive potential, and the second electrode 302 is also referred to as a collector. In this embodiment, the second electrode 302 is planar, and the first electrode 301 is parallel to the second electrode 302. In this embodiment, a line-surface 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:

In this embodiment, the first electrode 301 is mesh-shaped, and the first electrode 301 has a negative potential. Meanwhile, in the embodiment, the second electrode 302 is planar, and the second electrode 302 is charged with a positive potential, and the second electrode 302 is also referred to as a collector. In this embodiment, the second electrode 302 is planar, and the first electrode 301 is parallel to the second electrode 302. In this embodiment, a mesh surface electric field is formed between the first electrode 301 and the second electrode 302. In addition, the first electrode 301 in this embodiment is a mesh structure made of metal wires, and the first electrode 301 is made of a wire mesh. The area of the second electrode 302 is larger than that of the first electrode 301 in this embodiment.

Example 14

As shown in FIG. 16, the present embodiment provides an electrocoagulation device comprising:

In this embodiment, the first electrode 301 is point-shaped, and the first electrode 301 has a negative potential. Meanwhile, in the embodiment, the second electrode 302 is barrel-shaped, and the second electrode 302 is charged with 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 spot 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:

In this embodiment, the first electrode 301 is linear, and the first electrode 301 has a negative potential. Meanwhile, in the embodiment, the second electrode 302 is barrel-shaped, and the second electrode 302 is charged with 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 on the geometric symmetry axis of the barrel-shaped second electrode 302 in this embodiment. In this embodiment, a linear 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:

In this embodiment, the first electrode 301 is mesh-shaped, and the first electrode 301 has a negative potential. Meanwhile, in the embodiment, the second electrode 302 is barrel-shaped, and the second electrode 302 is charged with 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-bucket electrocoagulation electric 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:

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 in the left-right direction is greater than the length of the second electrode 302 in the left-right direction, and the left end of the first electrode 301 is located at the left of the second electrode 302. The left end of the first electrode 301 and the left end of the second electrode 302 form an electric line of force extending in an oblique direction. An asymmetric electrocoagulation electric field is formed between the first electrode 301 and the second electrode 302 in this embodiment. In use, water mist (low specific resistance substance), such as droplets, enters between the two second electrodes 302 from the left. After part of the droplets are charged, the droplets move from the left end of the first electrode 301 to the left end of the second electrode 302 in an oblique direction, thereby forming a pulling action on the droplets.

Example 18

As shown in FIG. 20, the present embodiment provides an electrocoagulation device comprising:

a first electrode capable of conducting electrons to the nitric acid-containing water mist; when the electrons are conducted to the water mist containing the nitric acid, the water mist containing the nitric acid is electrified;

and the second electrode can apply attraction force to the charged water mist.

The first electrode and the second electrode constitute the adsorption unit 3010 in this embodiment. In this embodiment, there are a plurality of suction units 3010, and all the suction units 3010 are distributed in the horizontal direction. In this embodiment, all the adsorption 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:

and the second electrode can apply attraction force to the charged water mist.

The first electrode and the second electrode constitute the adsorption unit 3010 in this embodiment. In this embodiment, there are a plurality of suction units 3010, and all the suction units 3010 are distributed in the vertical direction.

Example 20

As shown in FIG. 22, the present embodiment provides an electrocoagulation device comprising:

and the second electrode can apply attraction force to the charged water mist.

The first electrode and the second electrode constitute the adsorption 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 an oblique direction.

Example 21

As shown in FIG. 23, the present embodiment provides an electrocoagulation device comprising:

and the second electrode can apply attraction force to the charged water mist.

The first electrode and the second electrode constitute the adsorption unit 3010 in this embodiment. In this embodiment, there are a plurality of adsorption units 3010, and all the adsorption units 3010 are distributed along a spiral direction.

Example 22

As shown in FIG. 24, the present embodiment provides an electrocoagulation device comprising:

and the second electrode can apply attraction force to the charged water mist.

The first electrode and the second electrode constitute the adsorption unit 3010 in this embodiment. In this embodiment, there are a plurality of suction units 3010, and all the suction units 3010 are arranged in the left-right direction, the up-down direction, and the oblique direction.

In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

The engine tail gas ozone purification system is characterized by comprising a denitration device, a denitration device and a purification device, wherein the denitration device is used for removing nitric acid in a mixed reaction product of an ozone stream and a tail gas stream; the denitrification device comprises an electrocoagulation device comprising a first electrode and a second electrode; the first electrode is electrically connected with the cathode of the power supply, and the second electrode is electrically connected with the anode of the other electrode of the power supply; the voltage of the power supply is less than the initial corona onset voltage.
The engine exhaust ozone purification system of claim 1, wherein the first electrode is solid metal, graphite, or 304 steel.
The engine exhaust ozone purification system of claim 1 or 2, wherein the first electrode is in a shape of a net, a perforated plate, a ball cage, a box, or a tube.
The engine exhaust ozone purification system of any one of claims 1 to 3, wherein the first electrode is provided with a front through hole.
The engine exhaust ozone purification system of any one of claims 1 to 4, wherein the second electrode is provided with a rear through hole.
The engine exhaust ozone purification system according to any one of claims 1 to 5, wherein the second electrode is made of an electrically conductive substance.
The engine exhaust ozone purification system according to any one of claims 1 to 6, wherein a surface of the second electrode has an electrically conductive substance.
The engine exhaust ozone purification system of any one of claims 1 to 7, wherein the first electrode is a wire mesh.
The engine exhaust ozone purification system of any one of claims 1 to 8, wherein there are two of the second electrodes, and the first electrode is located between the two second electrodes.
The engine exhaust ozone purification system according to any one of claims 1 to 9, wherein the first electrode and the second electrode constitute an adsorption unit, and the adsorption unit is provided in plurality.
The engine exhaust ozone purification system of claim 10, wherein all of the adsorption units are distributed in one or more of a left-right direction, a front-back direction, an oblique direction, or a spiral direction.
The engine exhaust ozone purification system of any one of claims 1 to 11, wherein the ratio of the cross-sectional area of the first electrode to the cross-sectional area of the electrocoagulation flow channel is 99% to 10%, or 90% to 10%, or 80% to 20%, or 70% to 30%, or 60% to 40%, or 50%.