CN117794632A - Denitration technology for industrial waste gas - Google Patents
Denitration technology for industrial waste gas Download PDFInfo
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- CN117794632A CN117794632A CN202380011820.8A CN202380011820A CN117794632A CN 117794632 A CN117794632 A CN 117794632A CN 202380011820 A CN202380011820 A CN 202380011820A CN 117794632 A CN117794632 A CN 117794632A
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- 239000007789 gas Substances 0.000 title claims abstract description 121
- 239000002440 industrial waste Substances 0.000 title claims abstract description 109
- 238000005516 engineering process Methods 0.000 title description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 205
- 238000001179 sorption measurement Methods 0.000 claims abstract description 75
- 239000003463 adsorbent Substances 0.000 claims abstract description 66
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 57
- 238000000034 method Methods 0.000 claims abstract description 30
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- 238000005192 partition Methods 0.000 claims description 37
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- 239000000428 dust Substances 0.000 claims description 15
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- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 9
- 239000003546 flue gas Substances 0.000 claims description 8
- 238000012856 packing Methods 0.000 claims description 6
- 238000003795 desorption Methods 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 5
- 229910002651 NO3 Inorganic materials 0.000 claims description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 4
- 229910017604 nitric acid Inorganic materials 0.000 claims description 4
- 229910021536 Zeolite Inorganic materials 0.000 claims description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
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- 239000010457 zeolite Substances 0.000 claims description 3
- 238000007323 disproportionation reaction Methods 0.000 abstract description 6
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 abstract description 4
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 3
- 239000000779 smoke Substances 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- DOBUSJIVSSJEDA-UHFFFAOYSA-L 1,3-dioxa-2$l^{6}-thia-4-mercuracyclobutane 2,2-dioxide Chemical compound [Hg+2].[O-]S([O-])(=O)=O DOBUSJIVSSJEDA-UHFFFAOYSA-L 0.000 description 1
- FRWYFWZENXDZMU-UHFFFAOYSA-N 2-iodoquinoline Chemical compound C1=CC=CC2=NC(I)=CC=C21 FRWYFWZENXDZMU-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- LTPBRCUWZOMYOC-UHFFFAOYSA-N beryllium oxide Inorganic materials O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
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- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
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Landscapes
- Treating Waste Gases (AREA)
Abstract
The invention belongs to the technical field of emission reduction of smoke pollutants, and discloses a denitration process of industrial waste gas, which comprises the following steps: step S1, discharging industrial waste gas in a boiler and introducing the industrial waste gas into a precooler, wherein the precooler cools the temperature of the industrial waste gas to be below 80 ℃; s2, reacting ozone in an ozone generator with nitric oxide in cooled industrial waste gas to generate high-valence nitrogen oxides, wherein the molar ratio of the nitric oxide in the ozone generator to the ozone is 1:1-1:2; and S3, introducing the high-valence nitrogen oxides and the cooled industrial waste gas into an adsorption tower, adsorbing the oxidized industrial waste gas by using an adsorbent in the adsorption tower, and discharging the treated clean gas from the adsorption tower. According to the industrial waste gas denitration process, the proper excessive ozone can inhibit disproportionation reaction of the adsorbent in the process of adsorbing nitrogen dioxide, meanwhile, the ozone adding amount can be saved to the maximum extent, and the ozone waste is prevented.
Description
Technical Field
The invention belongs to the technical field of emission reduction of smoke pollutants, and relates to a denitration process of industrial waste gas.
Background
Industrial waste gas refers to various polluted gases discharged into the air in the combustion and production process of fuel in factories of enterprises, including carbon dioxide, carbon disulfide, hydrogen sulfide, fluoride, nitrogen oxide, chlorine, hydrogen chloride, carbon monoxide, lead mercury sulfate (fog), beryllium oxide, smoke dust, production dust and the like, and the discharge of the industrial waste gas into the atmosphere can seriously pollute the air and endanger the life and health of people.
The main stream technology of traditional industrial waste gas denitration is SCR denitration technology. The SCR denitration technology has the advantages of high denitration efficiency, small occupied area and the like, but the conventional SCR industrial waste gas denitration technology requires a higher temperature (350-420 ℃) and has the defects that if the reaction temperature is too low, the denitration efficiency is influenced, more importantly, the catalyst is easy to poison, the production safety hidden trouble is large, secondary pollution is easy to cause in the production process, the denitration catalyst is high in price and high in production cost, so that the denitration technology of the industrial waste gas with high production safety and no secondary pollution is necessary.
Disclosure of Invention
The invention aims to solve the problems and provide a denitration process for industrial waste gas. The industrial waste gas denitration process has high production safety and no secondary pollution.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a process for denitration of industrial waste gas, comprising:
step S1, discharging industrial waste gas in a boiler and introducing the industrial waste gas into a precooler, wherein the precooler cools the temperature of the industrial waste gas to be below 80 ℃;
s2, reacting ozone in an ozone generator with nitric oxide in cooled industrial waste gas to generate high-valence nitrogen oxides, wherein the molar ratio of the nitric oxide in the ozone generator to the ozone is 1:1-1:2;
and S3, introducing the high-valence nitrogen oxides and the cooled industrial waste gas into an adsorption tower, carrying out adsorption treatment on the oxidized industrial waste gas by using an adsorbent in the adsorption tower, and discharging the treated clean gas from the adsorption tower.
Preferably, in the step S2, the nitric oxide content in the cooled industrial waste gas is monitored by a nitric oxide concentration sensor, and the molar ratio of nitric oxide to ozone in the ozone generator is controlled to be 1:1-1:2 by the monitored nitric oxide content.
Preferably, in the step S3, the adsorbent is a ZSM-5 molecular sieve or a 13X molecular sieve or other zeolite molecular sieves.
Preferably, the step S3 further includes:
s4, introducing the adsorbent reacted in the step S3 into a regeneration tower, and introducing a regeneration heat source into the regeneration tower;
the regeneration tower analyzes and processes the reacted adsorbent into nitrogen oxides, the regeneration heat source heats and regenerates the reacted adsorbent, and the regenerated adsorbent is introduced into the adsorption tower for recycling.
Preferably, the nitrogen oxides after the analysis treatment are introduced into the boiler to be continuously combusted until the concentration of the nitrogen oxides in the industrial waste gas is balanced.
Preferably, the nitrogen oxides after the desorption treatment are prepared into nitric acid or nitrate.
Preferably, in the step S3, the adsorption tower includes a packing portion, at least two feeding portions disposed at an upper end of the packing portion, and at least two discharging portions disposed at a lower end of the packing portion.
Preferably, the adsorption tower further comprises a partition plate axially arranged in the adsorption tower, the partition plate penetrates through the filler part, and the upper end and the lower end of the partition plate extend to the top wall and the second screen of the flue gas channel respectively; the partition board comprises a first partition board and a second partition board which are arranged perpendicular to each other, and the first partition board and the second partition board divide the adsorption tower into a plurality of partition chambers.
Preferably, when the boiler is a gas boiler, the step S1 further includes:
step S0: and introducing the industrial waste gas into an air preheater, carrying out heat recovery treatment on the industrial waste gas by the air preheater, and introducing the treated industrial waste gas into the precooler.
Preferably, when the boiler is a non-gas-fired boiler, the introducing the preheated industrial waste gas into the precooler further comprises:
and introducing the preheated industrial waste gas into a dust remover, removing dust in the preheated industrial waste gas by the dust remover, and introducing the industrial waste gas after dust removal into a precooler.
The invention provides a denitration process for industrial waste gas, wherein ozone generated by an ozone generator is used for oxidizing the industrial waste gas, low-valence nitric oxide is oxidized into high-valence nitric oxide, the high-valence nitric oxide is more effectively adsorbed by an adsorbent in an adsorption tower, and proper excessive ozone can inhibit disproportionation reaction of the adsorbent in the process of adsorbing nitrogen dioxide, meanwhile, the dosage of ozone can be saved to the greatest extent, and ozone waste is prevented.
Drawings
FIG. 1 is a flow chart of a denitration process of industrial waste gas provided by an embodiment of the invention;
fig. 2 is a schematic diagram of a denitration system for industrial waste gas according to an embodiment of the present invention;
FIG. 3 is a diagram showing an exemplary structure of an adsorption tower according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a partition board according to an embodiment of the present invention;
wherein 10 is a boiler, 20 is an air preheater, 30 is a dust remover, 40 is a precooler, 50 is an ozone generator, 51 is an electromagnetic valve, 52 is a nitric oxide concentration sensor, 60 is an adsorption tower, 601 is an industrial waste gas inlet, 602 is a tail gas outlet, 603 is a filler part, 604 is a feeding part, 6041 is a first outer shell, 6042 is a first inner shell, 605 is a discharging part, 6051 is a second outer shell, 606 is a discharging pipeline, 607 is a control valve, 608 is an adsorbent filling hopper, 609 is a first screen, 610 is a second screen, 611 is a partition plate, 6111 is a first partition plate, 6112 is a second partition plate, 612 is a partition chamber, 613 is a flue gas channel, 614 is an adsorbent discharging hopper, and 70 is a regeneration tower.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The description as it relates to "first", "second", "third", etc. in the present invention is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implying an indication of the number of technical features indicated.
In the description of the present invention, the terms "upper," "lower," "top," "bottom," "inner," "outer," and the like are used for convenience in describing and simplifying the description of the present invention only, and do not denote or imply that the devices or elements in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention.
Referring to fig. 1 and fig. 4, a process for denitration of industrial waste gas according to a first embodiment of the present invention is shown in fig. 1, and a flowchart of a process for denitration of industrial waste gas according to an embodiment of the present invention is shown in fig. 2, and the process specifically includes: step S1, discharging industrial waste gas in a boiler and introducing the industrial waste gas into a precooler, wherein the precooler cools the temperature of the industrial waste gas to be below 80 ℃; s2, reacting ozone in an ozone generator with nitric oxide in cooled industrial waste gas to generate high-valence nitrogen oxides, wherein the molar ratio of the nitric oxide in the ozone generator to the ozone is 1:1-1:2; and S3, introducing the high-valence nitrogen oxides and the cooled industrial waste gas into an adsorption tower, carrying out adsorption treatment on the oxidized industrial waste gas by using an adsorbent in the adsorption tower, and discharging the treated clean gas from the adsorption tower.
In the embodiment of the invention, the molar ratio of the nitric oxide to the ozone in the ozone generator 50 is controlled between 1:1 and 1:2, and the proper excess ozone can inhibit the disproportionation reaction of the adsorbent in the process of adsorbing the nitrogen dioxide, and simultaneously can maximally save the dosage of the ozone and prevent the waste of the ozone.
As a further preferred option, in the step S2, the nitric oxide concentration sensor monitors the nitric oxide content in the cooled industrial waste gas, and controls the molar ratio of nitric oxide to ozone in the ozone generator 50 to be 1:1-1:2 through the monitored nitric oxide content, an electromagnetic valve 51 is arranged on an air outlet pipeline of the ozone generator 50, an air inlet end of the adsorption tower 60 is provided with a nitric oxide concentration sensor 52, the nitric oxide concentration sensor 52 is used for monitoring the concentration of nitric oxide in the industrial waste gas in the air inlet end of the adsorption tower 60, the ozone generator 50 controls the opening of the electromagnetic valve 51 again, so that the molar ratio of nitric oxide to ozone in the ozone generator 50 is 1:1-1:2, and the ozone is kept moderate to inhibit the disproportionation reaction.
Specifically, in the ozone generator 50, air, oxygen or liquid oxygen may be used as a raw material of the ozone generator 50, ozone is used for oxidizing nitric oxide into nitrogen oxides in a high valence state which are easily adsorbed by an adsorbent, the adsorption tower 60 is used for countercurrent contact or cross flow contact of industrial waste gas and the adsorbent, the adsorbent is fed into the adsorption tower 60 from the feeding portion 604 at the top of the adsorption tower, and discharged from the discharging portion 605 at the bottom of the adsorption tower 60.
As a further preferred option, in the step S3, the adsorbent is a ZSM-5 molecular sieve, a 13X molecular sieve, or other zeolite molecular sieves, and in the embodiment of the present invention, the adsorbent in the adsorption tower 60 adopts a molecular sieve to adsorb the oxidized high-valence nitrogen oxides in the industrial waste gas, and the molecular sieve has strong adsorption capability of nitrogen oxides, but no reduction capability, and does not reduce ozone, so that it is beneficial to maintain a proper amount of ozone in the adsorption tower 60 to inhibit the disproportionation reaction.
In the embodiment of the present invention, the adsorption tower 60 employs a fixed bed type adsorption tower in which the adsorbent is fixed in the adsorption tower 60 to react, or a moving bed type adsorption tower in which the adsorbent is fluidized in the adsorption tower 60 to react. When the adsorbent in the adsorption tower after adsorbing nitrogen oxides is regenerated, if a fixed bed adsorption tower is adopted, heating regeneration is performed in the fixed bed adsorption tower 60; if a moving bed type adsorption column is used, the adsorbent in the moving bed type adsorption column is moved into the regeneration column 70 to be heated and regenerated.
In the embodiment of the present invention, please refer to fig. 3, which is a structural example diagram of an adsorption tower provided in the embodiment of the present invention, the adsorption tower 60 includes: in the embodiment of the invention, in order to make the feeding efficiency of the feeding portion 604 and the discharging efficiency of the discharging portion 605 higher, the feeding portion 604 and the discharging portion 605 may be disposed at opposite ends of the feeding portion 603, and the blanking path formed between the feeding portion 604 and the discharging portion 605 may be designed to be in a vertical direction, so that the feeding portion 604 can realize feeding and discharging by only gravity without external force action when the feeding portion 604 and the discharging portion 605 are discharged, and in addition, in the embodiment of the invention, the at least two discharging portions 605 are disposed, the occurrence of the condition that the adsorbent cannot be discharged due to partial clamping is prevented, and the operation stability of the adsorption tower 60 is improved.
In the embodiment of the present invention, the bottom of the discharging portion 605 is respectively provided with a discharging pipe 606, the discharging pipe 606 is provided with a control valve 607, when in use, the industrial waste gas enters the adsorption tower 60, flows in the adsorption tower 60 from bottom to top, the adsorbent is filled in the feeding portion 604 from top to bottom and enters the filling portion 603, the industrial waste gas flows reversely with the adsorbent, the contact effect of the adsorbent and the industrial waste gas is improved, and the adsorption efficiency of the adsorbent on the nitrogen oxides in the industrial waste gas is improved. The adsorbent falls from the filler part 603 to the bottom of the adsorption tower 60 and is deposited in the discharge part 605, after the adsorbent is adsorbed and saturated, the control valve 607 is opened to discharge the adsorbent adsorbed with nitrogen oxides through the discharge pipeline 606; the adsorbed industrial waste gas is discharged from the tail gas outlet 602.
In the embodiment of the present invention, the feeding portion 604 includes a first outer casing 6041 with a square taper and a first inner casing 6042 with a taper, the first inner casing 6042 is an adsorbent filling hopper 608, the discharging portion 605 includes a second outer casing 6051 with a taper and a second inner casing (not shown in the drawing), the second inner casing is an adsorbent discharging hopper 614, the adsorbent filling hopper 608 dispersedly stacks the adsorbent into a plurality of small stacks, and adopts the dispersed stacking mode to perform the distribution, thereby reducing the volume without materials, reducing the arrangement of redundant adsorbent, and reducing the production cost, and meanwhile, compared with the feeding mode of the whole large-volume stacking, the dispersed stacking of small volumes promotes the uniformity of the adsorbent, so that the adsorbent is uniformly distributed on the filling portion 603, and the stability and uniformity of the adsorbent on the industrial waste gas adsorption are ensured.
In the embodiment of the present invention, a first screen 609 is further disposed at an end of the adsorption tower 60 near the discharging portion 605, the industrial waste gas flows transversely along the first screen 609 and then flows vertically upwards in the adsorption tower 60, and the adsorbent adsorbs nitrogen oxides and then flows vertically downwards along the first screen 609, so that the uniformity of the distribution of the industrial waste gas is improved by the first screen 609, the full contact between the industrial waste gas and the adsorbent is ensured, and the uniformity of the adsorption of the adsorbent to the industrial waste gas is further ensured. In addition, a second screen 610 is further disposed at an end of the adsorption tower 60 near the feeding portion 604, and the second screen 610 is an ozone carbon removing layer with activated carbon, and the activated carbon filter layer is used for further treating the industrial waste gas adsorbed by the adsorbent to remove excessive ozone possibly existing in a small amount in the tail gas.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a partition board provided in the embodiment of the present invention, in order to improve the distribution uniformity of the adsorbent entering the adsorption tower 60, the adsorption tower 60 further includes a partition board 611 axially disposed in the adsorption tower 60, the partition board 611 penetrates through the filler portion 603, and the upper and lower ends of the partition board extend to the top wall and the second screen 610 of the flue gas channel 613 respectively; the partition plate 611 includes a first partition plate 6111 and a second partition plate 6112 that are disposed perpendicular to each other, where the first partition plate 6111 and the second partition plate 6112 partition the adsorption tower 60 into a plurality of partition chambers 612, and the plurality of partition chambers 612 may be symmetrically arranged, specifically, for example, the number of flue gas amounts to be set according to the actual requirement for the adsorption treatment, for example, in some embodiments, may be set to 4-16. When the adsorption tower is used, the industrial waste gas enters the adsorption tower 60 and then fully contacts with the adsorbent uniformly distributed in the partition chamber 612, flows from bottom to top along the partition chamber 612, and meanwhile, the uniformity of the distribution of the industrial waste gas is improved, the full contact between the industrial waste gas and the adsorbent is ensured, and the uniformity of the adsorption of the adsorbent to the industrial waste gas is further ensured.
As a further preferred aspect, the step S3 further includes: step S4, introducing the adsorbent reacted in the step S3 into a regeneration tower, and introducing a regeneration heat source into the regeneration tower 70; the regeneration tower 70 analyzes and processes the reacted adsorbent into nitrogen oxides, the regeneration heat source heats and regenerates the reacted adsorbent, and the regenerated adsorbent is introduced into the adsorption tower 60 for recycling. In the embodiment of the present invention, the regeneration tower 70 is used for performing a regeneration treatment on the adsorbent having the nitrogen oxide adsorbed thereon, and the adsorbent is separated from the nitrogen oxide after being treated by the regeneration tower 70, so as to obtain the nitrogen oxide and the regenerated adsorbent.
Specifically, after the adsorbent in the adsorption tower 60 is introduced into the regeneration tower 70, the regeneration tower 70 parses the adsorbed adsorbent into nitrogen oxides, and in the embodiment of the present invention, the adsorbent with saturated adsorption in the regeneration tower 70 may be regenerated by heating, and the heat source may be steam, high-temperature flue gas, high-temperature air, etc., and the heating mode may be direct or indirect heating.
Further preferably, the nitrogen oxides after the desorption treatment are fed into the boiler 10 for continuous combustion until the concentration of the nitrogen oxides in the industrial waste gas is balanced. In the embodiment of the present invention, one treatment mode of the nitrogen oxides after the analysis treatment is a backfire treatment, the nitrogen oxides after the analysis treatment are returned to the boiler 10 for continuous combustion, and the nitrogen oxides in the boiler 10 inhibit O through a thermodynamic equilibrium mechanism of reversible reaction 2 And N 2 The reaction proceeds in the direction of the formation of nitrogen oxides until the concentration of nitrogen oxides in the industrial exhaust gas increases by 6% -12%, specifically, the equilibrium concentration of nitrogen oxides may be set according to the amount of flue gas actually required for the adsorption treatment, for example, in some embodiments, may be set to 6% -8%, and after the increase, the concentration of nitrogen oxides reaches a basic equilibrium state and does not increase any more.
Further preferably, the nitrogen oxide after the desorption treatment is prepared as nitric acid or nitrate. In the embodiment of the present invention, another treatment mode of the nitrogen oxides after the analysis treatment is resource utilization, and the nitrogen oxides discharged from the regeneration tower 70 are collected intensively to obtain enriched nitrogen oxides, and the enriched nitrogen oxides are further oxidized into products such as nitric acid, nitrate and the like for use.
As a further preferred option, the boiler 10 is a gas-fired boiler or a non-gas-fired boiler. When the boiler 10 is a gas boiler, the step S1 further includes a step S0: the industrial waste gas is led into the air preheater 20, the air preheater 20 performs heat recovery treatment on the industrial waste gas, and the treated industrial waste gas is led into the precooler 40, in the embodiment of the present invention, the air preheater 20 is arranged between the boiler 10 and the precooler 40, so that the industrial waste gas discharged from the boiler can perform heat exchange, and the heat utilization rate in the system is improved.
As a further preferred aspect, when the boiler 10 is a non-gas-fired boiler, the passing the preheated industrial waste gas into the precooler 40 further includes: the preheated industrial waste gas is introduced into a dust remover 30, the dust remover 30 removes dust in the preheated industrial waste gas, and the industrial waste gas after dust removal is introduced into a precooler 40.
The invention relates to a denitration process of industrial waste gas, which comprises the following steps: step S1, discharging industrial waste gas in a boiler and introducing the industrial waste gas into a precooler, wherein the precooler cools the temperature of the industrial waste gas to be below 80 ℃; s2, reacting ozone in an ozone generator with nitric oxide in cooled industrial waste gas to generate high-valence nitrogen oxides, wherein the molar ratio of the nitric oxide in the ozone generator to the ozone is 1:1-1:2; and S3, introducing the high-valence nitrogen oxides and the cooled industrial waste gas into an adsorption tower, carrying out adsorption treatment on the oxidized industrial waste gas by using an adsorbent in the adsorption tower, and discharging the treated clean gas from the adsorption tower. According to the industrial waste gas denitration process disclosed by the invention, the ozone generated by the ozone generator is used for carrying out oxidation treatment on the industrial waste gas, the low-valence nitric oxide is oxidized into the high-valence nitric oxide, the high-valence nitric oxide is more effectively adsorbed by the adsorbent in the adsorption tower, the proper excessive ozone can inhibit the disproportionation reaction of the adsorbent in the process of adsorbing nitrogen dioxide, the ozone adding amount can be furthest saved, and the ozone waste is prevented.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A process for denitration of an industrial waste gas, comprising:
step S1, discharging industrial waste gas in a boiler (10) and introducing the industrial waste gas into a precooler (40), wherein the precooler (40) cools the temperature of the industrial waste gas to be below 80 ℃;
s2, reacting ozone in an ozone generator (50) with nitric oxide in cooled industrial waste gas to generate high-valence nitrogen oxides, wherein the molar ratio of the nitric oxide in the ozone generator (50) to the ozone is 1:1-1:2;
and S3, introducing the high-valence nitrogen oxides and the cooled industrial waste gas into an adsorption tower (60), adsorbing the oxidized industrial waste gas by an adsorbent in the adsorption tower (60), and discharging the treated clean gas from the adsorption tower (60).
2. The process for denitration of industrial waste gas according to claim 1, wherein in step S2, the nitric oxide content in the cooled industrial waste gas is monitored by a nitric oxide concentration sensor (52), and the molar ratio of nitric oxide to ozone in the ozone generator (50) is controlled to be 1:1-1:2 by the monitored nitric oxide content.
3. The process according to claim 1, wherein in step S3, the adsorbent is ZSM-5 molecular sieve or 13X molecular sieve or other zeolite molecular sieve.
4. The process for denitration of industrial waste gas according to claim 1, wherein step S3 further comprises:
step S4, introducing the adsorbent reacted in the step S3 into a regeneration tower, and introducing a regeneration heat source into the regeneration tower (70);
the regeneration tower (70) analyzes and processes the reacted adsorbent into nitrogen oxides, the regeneration heat source heats and regenerates the reacted adsorbent, and the regenerated adsorbent is introduced into the adsorption tower (60) for recycling.
5. The process for denitration of an industrial waste gas according to claim 4, wherein the nitrogen oxides after the desorption treatment are fed into the boiler (10) and continuously combusted until the concentration of the nitrogen oxides in the industrial waste gas is balanced.
6. The process for denitration of an industrial waste gas according to claim 4, wherein the nitrogen oxide after the desorption treatment is produced into nitric acid or nitrate.
7. The process for denitration of industrial waste gas according to claim 1, wherein in the step S3, the adsorption tower includes a packing portion (603), at least two feeding portions (604) provided at an upper end of the packing portion (603), and at least two discharging portions (605) provided at a lower end of the packing portion (603).
8. The industrial waste gas denitration process according to claim 7, wherein the adsorption tower (60) further comprises a partition plate (611) axially provided in the adsorption tower (60), the partition plate (611) penetrates the filler part (603) and upper and lower ends thereof extend to a top wall and a second screen (610) of the flue gas channel (613), respectively; the partition board (611) comprises a first partition board (6111) and a second partition board (6112) which are arranged perpendicular to each other, and the first partition board (6111) and the second partition board (6112) partition the adsorption tower (60) into a plurality of partition chambers (612).
9. The process for denitration of industrial waste gas according to claim 1, wherein the step S1 further comprises, before the treatment:
step S0: and (3) introducing the industrial waste gas into an air preheater (20), performing heat recovery treatment on the industrial waste gas by the air preheater (20), and introducing the treated industrial waste gas into a precooler (40).
10. The process for denitration of industrial waste gas according to claim 9, wherein when the industrial waste gas is dust-laden flue gas, the passing of the preheated industrial waste gas into the precooler (40) further comprises:
and introducing the preheated industrial waste gas into a dust remover (30), removing dust in the preheated industrial waste gas by the dust remover (30), and introducing the industrial waste gas from which the dust is removed into a precooler (40).
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