CN112473343A - Waste gas treatment equipment and method - Google Patents
Waste gas treatment equipment and method Download PDFInfo
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- CN112473343A CN112473343A CN202011454038.8A CN202011454038A CN112473343A CN 112473343 A CN112473343 A CN 112473343A CN 202011454038 A CN202011454038 A CN 202011454038A CN 112473343 A CN112473343 A CN 112473343A
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- 239000002912 waste gas Substances 0.000 title claims abstract description 146
- 238000000034 method Methods 0.000 title claims abstract description 37
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 95
- 239000007789 gas Substances 0.000 claims abstract description 79
- 239000003513 alkali Substances 0.000 claims abstract description 58
- 239000007800 oxidant agent Substances 0.000 claims abstract description 47
- 230000001590 oxidative effect Effects 0.000 claims abstract description 45
- 238000005273 aeration Methods 0.000 claims abstract description 35
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 34
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 18
- 239000007921 spray Substances 0.000 claims abstract description 14
- 238000005507 spraying Methods 0.000 claims description 86
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 50
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 19
- 239000010865 sewage Substances 0.000 claims description 16
- 239000011259 mixed solution Substances 0.000 claims description 7
- 238000006864 oxidative decomposition reaction Methods 0.000 claims description 4
- 230000003472 neutralizing effect Effects 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 50
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 abstract description 24
- 230000003647 oxidation Effects 0.000 abstract description 23
- 229910021529 ammonia Inorganic materials 0.000 abstract description 22
- 238000010521 absorption reaction Methods 0.000 abstract description 16
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 abstract description 12
- QMMFVYPAHWMCMS-UHFFFAOYSA-N Dimethyl sulfide Chemical compound CSC QMMFVYPAHWMCMS-UHFFFAOYSA-N 0.000 abstract description 12
- 229910000037 hydrogen sulfide Inorganic materials 0.000 abstract description 12
- 239000000126 substance Substances 0.000 abstract description 8
- 231100000252 nontoxic Toxicity 0.000 abstract description 6
- 230000003000 nontoxic effect Effects 0.000 abstract description 6
- 238000006386 neutralization reaction Methods 0.000 abstract description 3
- 230000007717 exclusion Effects 0.000 abstract 1
- 239000012855 volatile organic compound Substances 0.000 description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 11
- 239000012670 alkaline solution Substances 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- FHHJDRFHHWUPDG-UHFFFAOYSA-L peroxysulfate(2-) Chemical compound [O-]OS([O-])(=O)=O FHHJDRFHHWUPDG-UHFFFAOYSA-L 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 239000003814 drug Substances 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 5
- 231100000719 pollutant Toxicity 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical class OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 3
- 239000005708 Sodium hypochlorite Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000011001 backwashing Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 239000012425 OXONE® Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000645 desinfectant Substances 0.000 description 1
- 239000002085 irritant Substances 0.000 description 1
- 231100000021 irritant Toxicity 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000010812 mixed waste Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- HJKYXKSLRZKNSI-UHFFFAOYSA-I pentapotassium;hydrogen sulfate;oxido sulfate;sulfuric acid Chemical compound [K+].[K+].[K+].[K+].[K+].OS([O-])(=O)=O.[O-]S([O-])(=O)=O.OS(=O)(=O)O[O-].OS(=O)(=O)O[O-] HJKYXKSLRZKNSI-UHFFFAOYSA-I 0.000 description 1
- 230000005501 phase interface Effects 0.000 description 1
- 238000006552 photochemical reaction Methods 0.000 description 1
- 238000006303 photolysis reaction Methods 0.000 description 1
- 230000015843 photosynthesis, light reaction Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
- B01D53/44—Organic components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/485—Sulfur compounds containing only one sulfur compound other than sulfur oxides or hydrogen sulfide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/52—Hydrogen sulfide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/58—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/104—Ozone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/306—Organic sulfur compounds, e.g. mercaptans
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Treating Waste Gases (AREA)
Abstract
The invention provides a waste gas treatment device and a method. Waste gas sprays the layer through one-level tower, the oxidant in the alkali lye that one-level tower sprayed the layer can absorb the hydrogen sulfide in the oxidation waste gas, methyl mercaptan and methyl sulfide, simultaneously can also carry out the partial absorption oxidation to ammonia and VOC in the waste gas, one-level tower defogging layer carries out the dewatering to waste gas, waste gas after the dewatering carries out oxidation reaction with ozone aeration dish exhaust ozone, ozone carries out secondary oxidation to ammonia and VOC in the waste gas, spray the alkali lye that the layer sprayed through the second grade tower at last and absorb the neutralization to the decomposition product of waste gas, absorb ammonia once more simultaneously, thereby reach harmful substance decomposition and absorption in the waste gas, and the nontoxic harmless gas of side exclusion.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a waste gas treatment device and a waste gas treatment method.
Background
In the process of discharging, transferring and purifying sewage, pollution gas is inevitably generated, and particularly, the composite foul smell seriously affects the health of workers and the normal life of surrounding residents. The existence of malodorous substances seriously affects the life of residents, and the malodorous substances generated by sewage treatment plants and sewage lifting pump stations are one of the main sources; the early sewage pools are all of open concrete structures, and are covered or coated with films and uniformly treated by leading waste gas out of pipelines along with the improvement of environmental protection requirements; the early treatment equipment adopts single processes such as activated carbon adsorption, UV photolysis, low-temperature plasma, simple acid-base spray tower and the like; with the improvement of national emission standards, the single process is continuously updated or combined for use due to low efficiency and substandard emission gas; the waste gas of sewage plants is not suitable for various concentration, condensation, combustion and other processes because of large waste gas amount and low pollutant concentration, and in the prior art, the waste gas is generally treated by adopting acid spraying, alkali spraying, sodium hypochlorite oxidation and alkali spraying modes.
However, the sodium hypochlorite oxidation product has an irritant odor and is easy to generate chlorine-containing pollution gas; and when sodium hypochlorite oxidation was to waste gas oxidation, because the oxidation reaction stroke is short, so that the oxidation is insufficient, and exhaust-gas treatment is not thorough, consequently, urgently needed an effectual treatment facility to carry out effective processing to waste gas to satisfy the emission demand.
Disclosure of Invention
In view of this, the embodiments of the present invention provide an apparatus and a method for treating exhaust gas, so as to effectively treat the exhaust gas to meet the emission requirement.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the invention discloses a waste gas treatment device in a first aspect, which is suitable for a sewage station or a sewage lifting pump station, and comprises: the system comprises a first-stage tower, a second-stage tower, a first-stage tower spraying layer, a first-stage tower demisting layer, an ozone aeration disc and a second-stage tower spraying layer;
the primary tower spraying layer, the primary tower demisting layer and the ozone aeration disc are sequentially arranged in the primary tower along the flow direction of waste gas;
the secondary tower spraying layer is arranged in the secondary tower;
the gas outlet of the first-stage tower is connected with the gas inlet of the second-stage tower;
the first-stage tower spraying layer is used for spraying mixed liquid which generates oxidation reaction with the entering waste gas, the ozone aeration disc is used for leading in ozone which generates homogeneous reaction with the demisted waste gas, and the second-stage tower spraying layer is used for spraying alkali liquor which is absorbed and neutralized with decomposition products of the waste gas.
Preferably, the number of the first-stage tower spraying layers is multiple, and the multiple first-stage tower spraying layers are divided into multiple groups and are sequentially arranged in the first-stage tower along the flow direction of the waste gas;
and/or the number of the secondary tower spraying layers is multiple, and the multiple secondary tower spraying layers are divided into multiple groups and are sequentially arranged in the secondary tower along the flow direction of the waste gas.
Preferably, the spraying direction of the primary tower spraying layer and/or the secondary tower spraying layer is opposite to the flowing direction of the waste gas.
Preferably, the ozone aeration disc also comprises a flow guide layer arranged at the downstream of the ozone aeration disc.
Preferably, the method further comprises the following steps: a second-stage tower demisting layer;
and the secondary tower demisting layers are arranged at the downstream of the secondary tower spraying layer.
Preferably, the method further comprises the following steps: a first-stage tower circulating water tank and a first-stage tower circulating pump;
the primary tower circulating water tank is arranged at the bottom of the primary tower and is used for collecting mixed liquid of alkali liquor and an oxidant in the primary tower;
and the primary tower circulating water tank is communicated with the primary tower spraying layer through the primary tower circulating pump.
Preferably, the method further comprises the following steps: a secondary tower circulating water tank and a secondary tower circulating pump;
the secondary tower circulating water tank is arranged at the bottom of the secondary tower and is used for collecting alkali liquor in the secondary tower;
and the secondary tower circulating water tank is communicated with the secondary tower demisting layer through the secondary tower circulating pump.
Preferably, the method further comprises the following steps: the system comprises an oxidant storage tank, an oxidant pump, an alkali liquor storage tank and an alkali liquor pump;
the oxidant storage tank is communicated with an outlet of the primary tower circulating pump through the oxidant pump;
and the alkali liquor storage tank is communicated with the primary tower circulating water tank and/or the secondary tower circulating water tank through the alkali liquor pump.
Preferably, the system also comprises an ozone tail gas alarm arranged at the gas outlet of the secondary tower.
Preferably, an ozone generator for generating ozone is also included;
the ozone generator is communicated with the ozone aeration disc.
The second aspect of the invention discloses a waste gas treatment method, which comprises the following steps:
s1, contacting the waste gas with a mixed solution, wherein the mixed solution comprises an oxidant and alkali liquor;
s2, demisting the waste gas;
s3, introducing ozone to enable the ozone and the exhaust gas to generate a homogeneous reaction;
s4, absorbing and neutralizing the products of the waste gas oxidative decomposition.
According to the content, the invention discloses a waste gas treatment device and a method, wherein a primary tower spraying layer, a primary tower demisting layer and an ozone aeration disc are sequentially arranged in a primary tower along the flow direction of waste gas; the secondary tower spraying layer is arranged in the secondary tower; the gas outlet of the first-stage tower is connected with the gas inlet of the second-stage tower; the first-stage tower spraying layer is used for spraying mixed liquid which generates oxidation reaction with the entering waste gas, the ozone aeration disc is used for leading in ozone which generates homogeneous reaction with the demisted waste gas, and the second-stage tower spraying layer is used for spraying alkali liquor which is absorbed and neutralized with decomposition products of the waste gas. Through the above-mentioned waste gas treatment equipment and method, waste gas sprays the layer through the first-level tower, the oxidant in the alkali lye that the first-level tower sprays the layer can absorb the hydrogen sulfide in the oxidation waste gas, methyl mercaptan and methyl sulfide, can also carry out the partial absorption oxidation to ammonia and VOC in the waste gas simultaneously, the first-level tower removes the fog layer and carries out the dewatering to waste gas, waste gas after the dewatering carries out oxidation reaction with the ozone that ozone aeration dish discharged, ozone carries out secondary oxidation to ammonia and VOC in the waste gas, spray the alkali lye that the layer sprayed through the second-level tower at last and absorb the neutralization to the decomposition product of waste gas, absorb ammonia once more simultaneously, thereby reach harmful substance decomposition and absorption in the waste gas, and the nontoxic harmless gas of elimination.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an exhaust treatment device according to an embodiment of the present invention;
FIG. 2 is a schematic view of a process for treating exhaust gas by an exhaust gas treatment device according to an embodiment of the present invention;
fig. 3 is a process diagram of an exhaust gas treatment device for treating exhaust gas according to an embodiment of the present invention.
The device comprises a waste gas inlet 1, a waste gas outlet 2, a primary tower spraying layer 3, a primary tower demisting layer 4, an ozone aeration disc 5, a flow guide layer 6, an inter-tower communication pipeline 7, a secondary tower spraying layer 8, a secondary tower demisting layer 9, a primary tower circulating water tank 10, a primary tower circulating pump 11, an oxidant storage tank 12, an oxidant dosing pump 13, a secondary tower circulating water tank 14, a secondary tower circulating pump 15, an alkali liquor storage tank 16, an alkali liquor pump 17, an ozone generator 18 and an ozone tail gas alarm 19.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
An embodiment of the present invention provides a waste gas treatment device, referring to fig. 1, where fig. 1 is a schematic structural diagram of a waste gas treatment device, and the waste gas treatment device is suitable for a sewage station or a sewage lifting pump station, and includes: the device comprises a primary tower, a secondary tower, a primary tower spraying layer 3, a primary tower demisting layer 4, an ozone aeration disc 5 and a secondary tower spraying layer 8;
the primary tower spraying layer 3, the primary tower demisting layer 4 and the ozone aeration disc 5 are sequentially arranged in the primary tower along the flow direction of waste gas;
the secondary tower spraying layer 8 is arranged in the secondary tower;
the gas outlet of the first-stage tower is connected with the gas inlet of the second-stage tower;
the first-stage tower spraying layer 3 is used for spraying mixed liquid which generates oxidation reaction with the entering waste gas, the ozone aeration disc 5 is used for leading in ozone which generates homogeneous reaction with the demisted waste gas, and the second-stage tower spraying layer 8 is used for spraying alkali liquor which is absorbed and neutralized with decomposition products of the waste gas.
It should be noted that the mixed liquid sprayed out of the first-stage tower spraying layer 3 mainly generates an oxidation reaction with the incoming waste gas, the mixed liquid mainly comprises an oxidizing agent and an alkaline solution, the waste gas mainly comprises ammonia gas, VOC, hydrogen sulfide, methyl mercaptan and methyl sulfide, the alkali liquor in the mixed liquid absorbs the hydrogen sulfide, the methyl mercaptan and the methyl sulfide, the oxidizing agent in the alkali liquor oxidizes, and the ammonia gas and the VOC in the waste gas can also realize partial absorption and oxidation.
It should be noted that the first-stage tower demisting layer 4 is arranged between the first-stage tower spraying layer 3 and the ozone aeration disc 5, the first-stage tower demisting layer 4 can remove water from the exhaust gas, and the exhaust gas can perform homogeneous reaction with the ozone discharged from the ozone aeration disc 5 after passing through the ozone aeration disc 5, that is, perform secondary oxidation with ammonia gas and VOC.
The alkali liquor sprayed by the secondary tower spraying layer 8 can absorb and neutralize acid waste gases such as decomposition products of nitrogen oxide, sulfur dioxide, a small amount of carbon dioxide and the like in the waste gases, and can absorb ammonia again, so that harmful substances in the waste gases are decomposed and absorbed, and nontoxic and harmless gases are removed.
Notably, a VOC is a volatile organic compound, an organic compound that participates in atmospheric photochemical reactions; PMS is peroxymonosulfate, a triple salt; such as potassium monopersulfate, white granular powder, is easy to dissolve in water, is a very effective oxidant and disinfectant, has very strong and effective non-chlorine oxidation capability, and meets the requirements of safety and environmental protection in the using and treating process; the homogeneous reaction is also called as "single-phase reaction", that is, a chemical reaction which occurs only in one phase (gas phase, liquid phase or solid phase), and is characterized in that no phase interface exists in the reaction system, and the reaction is rapid.
The primary tower spraying layer, the primary tower demisting layer and the ozone aeration disc are arranged in the primary tower along the flow direction of waste gas in sequence; the secondary tower spraying layer is arranged in the secondary tower; the gas outlet of the first-stage tower is connected with the gas inlet of the second-stage tower; the first-stage tower spraying layer is used for spraying mixed liquid which generates oxidation reaction with the entering waste gas, the ozone aeration disc is used for leading in ozone which generates homogeneous reaction with the demisted waste gas, and the second-stage tower spraying layer is used for spraying alkali liquor which is absorbed and neutralized with decomposition products of the waste gas. Through the above-mentioned waste gas treatment equipment that discloses, waste gas sprays the layer through one-level tower, the oxidant in the alkali lye that one-level tower sprayed the layer can absorb the hydrogen sulfide in the oxidation waste gas, methyl mercaptan and methyl sulfide, simultaneously can also carry out the partial absorption oxidation to ammonia and VOC in the waste gas, one-level tower defogging layer carries out the dewatering to waste gas, waste gas after the dewatering carries out oxidation reaction with ozone aeration dish exhaust ozone, ozone carries out secondary oxidation to ammonia and VOC in the waste gas, spray the alkali lye that the layer sprayed through the second-level tower at last and absorb the neutralization to the decomposition product of waste gas, absorb ammonia once more simultaneously, thereby reach harmful substance decomposition and absorption in the waste gas, and the nontoxic harmless gas of side by side of removing.
Furthermore, the number of the first-stage tower spraying layers 3 is multiple, and the multiple first-stage tower spraying layers 3 are divided into multiple groups and are sequentially arranged in the first-stage tower along the flow direction of the waste gas;
and/or, the second grade tower sprays the layer 8 quantity and is a plurality of, and is a plurality of the second grade tower sprays the layer 8 and divide into the multiunit and set up in proper order along the waste gas flow direction in the second grade tower.
It should be noted that, the number of the first-stage tower spraying layers 3 is set to be multiple, and the multiple first-stage tower spraying layers 3 are sequentially arranged in the first-stage tower along the flow direction of the waste gas, so that when the waste gas passes through the first-stage tower spraying layers 3, the alkali liquor in the mixed liquor sprayed by the first-stage tower spraying layers 3 can fully absorb the hydrogen sulfide, the methyl mercaptan and the methyl sulfide, the oxidant in the alkali liquor can oxidize the hydrogen sulfide, the methyl mercaptan and the methyl sulfide, and the hydrogen sulfide, the methyl mercaptan and the methyl sulfide in the waste gas are prevented from being oxidized incompletely; and the absorption and oxidation of large amounts of ammonia and VOCs in the exhaust gas.
The number of the second-level tower spraying layers 8 is set to be multiple, the second-level tower spraying layers 8 are sequentially arranged in the second-level tower along the flowing direction of waste gas, waste gas can be made to pass through when the second-level tower spraying layers 8 are arranged, alkali liquor sprayed by the second-level tower spraying layers 8 can fully absorb ammonia gas and VOC, acidic waste gas such as decomposition products of nitrogen oxide, sulfur dioxide and a small amount of carbon dioxide in the waste gas is fully absorbed and neutralized, and therefore toxic and harmful substances do not exist in the discharged waste gas.
Specifically, the spraying direction of the primary tower spraying layer 3 and/or the secondary tower spraying layer 8 is opposite to the flowing direction of the waste gas.
The spraying direction of the first-stage tower spraying layer 3 is opposite to the flowing direction of the waste gas, so that the sprayed alkaline solution can reversely contact with the waste gas, and the alkaline solution can better absorb ammonia gas, VOC, hydrogen sulfide, methyl mercaptan, methyl sulfide and the like in the waste gas; the spraying direction of the secondary tower spraying layer 8 is opposite to the flowing direction of the waste gas, so that the sprayed alkaline solution can reversely contact with the waste gas, the alkaline solution can better absorb the decomposition products of the waste gas and can absorb ammonia and VOC again.
Further, the waste gas treatment equipment also comprises a flow guide layer 6 arranged at the downstream of the ozone aeration disc 5.
It should be noted that, by providing the flow guiding layer 6, the flow guiding layer 6 can guide the exhaust gas and the ozone discharged from the ozone aeration disc 5 to a certain position for homogeneous reaction, and prevent the ozone generated by the ozone aeration disc 5 from entering the first-stage tower spraying layer 3.
Further, the exhaust gas treatment equipment still includes: a second-stage tower demisting layer 9;
the secondary tower demisting layers 9 are arranged at the downstream of the secondary tower spraying layer 8.
Further, the exhaust gas treatment equipment still includes: a first-stage tower circulating water tank 10 and a first-stage tower circulating pump 11;
the primary tower circulating water tank 10 is arranged at the bottom of the primary tower and is used for collecting mixed liquid of alkali liquor and an oxidant in the primary tower;
the primary tower circulating water tank 10 is communicated with the primary tower spraying layer 3 through the primary tower circulating pump 11.
It should be noted that, by arranging the primary tower circulating water tank 10 at the bottom of the primary tower, the primary tower circulating water tank 10 can collect the mixed liquid of the alkali liquor and the oxidant in the primary tower, so as to avoid the environment pollution caused by the discharge of the mixed liquid of the alkali liquor and the oxidant;
the primary tower circulating water tank 10 is communicated with the primary tower spraying layer 3 through the primary tower circulating pump 11, so that the mixed liquid collected by the primary tower circulating water tank 10 can be recycled, and the purpose of saving the medicament cost is achieved.
Further, the exhaust gas treatment equipment still includes: a secondary tower circulating water tank 14 and a secondary tower circulating pump 15;
the secondary tower circulating water tank 14 is arranged at the bottom of the secondary tower and is used for collecting alkali liquor in the secondary tower;
the secondary tower circulating water tank 14 is communicated with the secondary tower demisting layer 9 through the secondary tower circulating pump 15.
It should be noted that, by arranging the secondary tower circulating water tank 14 at the bottom of the secondary tower, the secondary tower circulating water tank 14 can collect alkali liquor in the secondary tower, so as to avoid pollution to the environment caused by discharge of the alkali liquor;
the secondary tower circulating water tank 14 is communicated with the secondary tower demisting layer 9 through the secondary tower circulating pump 15, so that alkali liquor collected by the secondary tower circulating water tank 14 can be recycled, and the purpose of saving the cost of the medicament is achieved.
Further, the exhaust gas treatment equipment still includes: an oxidant storage tank 12, an oxidant pump 13, an alkali liquor storage tank 16 and an alkali liquor pump 17;
the oxidant storage tank 12 is communicated with the outlet of the primary tower circulating pump 11 through the oxidant pump 13;
the lye storage tank 16 is communicated with the primary tower circulating water tank 10 and/or the secondary tower circulating water tank 14 through the lye pump 17.
Further, the waste gas treatment equipment also comprises an ozone tail gas alarm 19 arranged at the gas outlet 2 of the secondary tower.
It should be noted that, an ozone tail gas alarm 19 is arranged at the gas outlet 2 of the secondary tower, so that whether the discharged waste gas contains ozone or not can be detected, and if ozone exists, the ozone aeration disc 5 can be adjusted to ensure that no ozone is discharged, thereby reducing the pollution of ozone to the environment.
Further, the exhaust gas treatment apparatus further includes an ozone generator 18 for generating ozone;
the ozone generator 18 is communicated with the ozone aeration disc 5.
By providing the ozone generator 18, the ozone generated by the ozone generator 18 is delivered to the ozone aeration plate 5, and the ozone is supplied to the ozone aeration plate 5.
Preferably, the waste gas treatment equipment further comprises a secondary tower demisting layer 9 arranged at the downstream of the secondary tower spraying layer 8 and used for removing water from waste gas to be discharged.
Preferably, the primary tower demisting layer 8 and/or the secondary tower demisting layer 9 adopt ceramic stepped rings and are provided with back washing, so that long-time operation can be realized, and the device is not damaged and does not need to be replaced.
Preferably, the air outlet of the first-stage tower is connected with the air inlet of the second-stage tower through an inter-tower communication pipeline 7.
It should be noted that, by providing the inter-tower communication pipe 7 between the first-stage tower and the second-stage tower, the reaction stroke of ozone on ammonia and VOC in the exhaust gas can be lengthened, and further, the ozone can sufficiently oxidize the ammonia and VOC in the exhaust gas.
Referring to fig. 2, the present invention further provides an exhaust gas treatment method, which is suitable for the exhaust gas treatment equipment provided in the above embodiment, and the exhaust gas treatment method at least includes the following steps:
s1, in the primary tower, enabling the waste gas to contact with a mixed solution, wherein the mixed solution comprises an oxidant and alkali liquor;
s2, demisting the waste gas;
s3, introducing ozone to enable the ozone and the exhaust gas to generate a homogeneous reaction;
s4, absorbing and neutralizing the products of the oxidative decomposition of the waste gas by using alkali liquor in the secondary tower.
It is to be noted that when the waste gas passes through the first-stage tower, the line is firstly contacted with the mixed liquid in the first-stage tower, the alkali liquor in the mixed liquid absorbs the hydrogen sulfide, the methyl mercaptan and the methyl sulfide in the waste gas, the oxidant is oxidized, meanwhile, ammonia and VOC in the waste gas are partially absorbed, the waste gas is demisted through S2, the demisted waste gas is contacted with ozone to generate homogeneous reaction, namely, the VOC and the ammonia gas are secondarily oxidized by the ozone, and finally, the products of the oxidative decomposition of the waste gas are absorbed and neutralized by using alkali liquor in a secondary tower, can prevent acid waste gas such as decomposition products of the waste gas, namely nitrogen oxide, sulfur dioxide, a small amount of carbon dioxide and the like from being discharged into the external environment, and simultaneously absorb ammonia again, thereby achieving the decomposition and absorption of harmful substances in the waste gas and the elimination of nontoxic and harmless gases, thereby playing the role of preventing the waste gas from polluting the environment.
Further, based on the exhaust gas treatment method provided by the above embodiment, after the step of performing S4, the method further includes the following steps:
demisting the exhaust gas.
It should be noted that, in step S4, the alkaline solution is used to absorb and neutralize the decomposed product of the waste gas, and the waste gas contains a large amount of water molecules, so that the water molecules in the waste gas need to be removed, and then the waste gas is discharged.
Further, based on the exhaust gas treatment method provided by the above embodiment, after the step of performing S4, the method further includes the following steps:
detecting whether the exhaust gas contains ozone.
It should be noted that, through detecting whether the waste gas contains ozone, can adjust the volume that ozone aeration dish discharged ozone, avoid ozone to discharge to the external environment and cause the pollution.
To facilitate understanding of the above solution, the solution is further described below with reference to fig. 1-3.
In the process of discharging, transferring and purifying sewage, pollution gas is inevitably generated, and particularly, the composite foul smell seriously affects the health of workers and the normal life of surrounding residents. The main pollutant components of the waste gas are ammonia, hydrogen sulfide, methyl mercaptan, methyl sulfide, VOC and other compound malodorous gases. The scheme provides waste gas treatment equipment, and the waste gas treatment equipment is mainly used for comprehensively treating compound malodorous gas generated by a sewage station, a sewage lifting pump station and the like.
The working process of the waste gas treatment equipment is as follows:
the waste gas after collection is sent into the first-level tower through the waste gas inlet 1, the waste gas is in reverse contact with the alkaline solution containing the oxidant, which is atomized by the spraying layer 3 of the first-level tower on the three layers of the tower body, hydrogen sulfide, methyl mercaptan, methyl sulfide and the like in the waste gas are absorbed by the alkali liquor and are oxidized by the oxidant in the alkali liquor to promote absorption reaction, and ammonia and VOC in the waste gas can also realize partial absorption and oxidation. The waste gas after passing through the first-stage tower spraying layer 3 passes through the first-stage tower demisting layer 4 to remove most of water vapor carried in the waste gas. The demisted waste gas passes through an ozone aeration disc 5 on the upper layer of the first-stage tower and a diversion 6 layer to realize the homogeneous reaction of the waste gas and ozone, and the uniformly mixed waste gas passes through a communication pipeline 7 between towers to realize the secondary oxidation of the unreacted ammonia and VOC of the first-stage tower by the ozone. The oxidized waste gas enters a secondary tower, and is in reverse contact with the low-concentration alkaline solution atomized by the three spraying layers 8 in the tower body in sequence in the secondary tower, so that the acidic waste gas such as nitric oxide, sulfur dioxide, a small amount of carbon dioxide and the like which are oxidation decomposition products are absorbed and neutralized, and meanwhile, the third absorption of ammonia is realized through the characteristic that ammonia is very soluble in water. The waste gas after purification realizes the dehydration defogging of waste gas through double-deck second grade tower defogging layer 9 in second grade top of the tower, and the fan that the waste gas passes through exhaust outlet 2 or chimney is arranged waste gas outward after the defogging.
The first-stage tower circulating water tank 10 is internally provided with a mixed solution of alkali liquor and an oxidant, and is connected with the first-stage tower spraying layer 3 through a first-stage tower circulating pump 11 for recycling; wherein the alkali liquor is sodium hydroxide solution, and the oxidant is PMS (peroxymonosulfate); an oxidant is continuously pumped into an outlet pipeline of a first-stage tower circulating pump 11 through an oxidant storage tank 12 and an oxidant dosing pump 13, and alkali liquor is added into a first-stage tower circulating water tank 10 through an alkali liquor storage tank 16 and an alkali liquor pump 17; the PH value of the first-stage tower circulating water tank 10 is controlled to be 12-12.5, so that the self-decomposition of the oxidant is avoided, and the strong absorption capacity is ensured.
The exhaust gas flow velocity of the inter-tower communication pipeline 7 is less than 6m/s, so that the reaction time of ozone and exhaust gas is more than 2s, and the sufficient reaction time is ensured.
A low-concentration alkaline solution is arranged in the secondary tower circulating water tank 14 and is connected with the secondary tower spraying layer 8 through a secondary tower circulating pump 15 for recycling; wherein the alkali liquor is sodium hydroxide solution, and the alkali liquor is added into a secondary tower circulating water tank 14 through an alkali liquor storage tank 16 and an alkali liquor pump 17; the PH value of the circulating water tank 14 of the second-stage tower is controlled between 8 and 9, so that the absorption capacity is ensured, and the third absorption of ammonia is realized.
The ozone source of the ozone aeration disc 5 is from an ozone generator 18, the adding power of the ozone generator 18 can realize the output adjustment of 10% -100%, and an ozone tail gas alarm 19 is arranged at the secondary tower top waste gas outlet 2 to interlock with the ozone adding amount adjustment, so that no ozone is discharged.
The filler of the first-stage tower demisting layer 4 and/or the second-stage tower demisting layer 9 adopts ceramic stepped rings, so that the mechanical strength is ensured, and the resistance of gas passing through the filler layer is reduced. Each demisting layer is provided with a back washing device, so that the demisting layer is not damaged and does not need to be replaced.
According to the nature and concentration of pollutants in the waste gas of the sewage station, a liquid oxidant and a gas oxidant are jointly oxidized, and a double-tower two-stage alkali liquor spraying mode is adopted to ensure the sufficient oxidation and absorption of the pollutants;
the liquid oxidant is prepared by PMS (peroxymonosulfate), PMS is a derivative of hydrogen peroxide, is solid powder and is convenient to transport and store; the oxidability of the catalyst is better than that of hydrogen peroxide, and the product is relatively nontoxic and harmless; under the alkaline condition, the stability is better through the control of the PH value;
the gas oxidant is equalized with the waste gas on the top layer of the primary tower in a mode of an ozone aeration disc 5 and a flow guide layer 6, and then the flow-through wind speed of a communication pipeline 7 between towers is controlled, so that the ozone oxidation time is prolonged, and the full implementation of the oxidation reaction is ensured; meanwhile, the adding amount of the oxidant is adjustable, and the oxidant and the ozone tail gas alarm 19 ensure that no ozone residue exists in the discharged waste gas;
the hollow tower is adopted for spraying, the demisting layer adopts a ceramic stepped ring and is provided with back washing, long-time operation can be realized, and the hollow tower is not damaged and does not need to be replaced;
the circulating water tank and the circulating pump are matched, so that the recycling of the medicament is realized, the medicament is discharged periodically, the residual value of the medicament is fully utilized, and the operating cost is saved;
the two towers are respectively provided with a water tank and can be respectively adjusted according to the concentration of waste gas and the property of pollutants;
the alternative scheme of the invention is as follows:
replacing an oxidant, a demisting layer filler and the like through a tower body structure;
the process route is applied to other industries with similar waste gas components.
The key points of the invention are as follows: the double-tower structure and the internal arrangement mode, the PH control of the water tank, the selection and the addition mode of the liquid oxidant, the adjustment and the addition position and the addition mode of the gas oxidant and the lengthening of the reaction stroke.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An exhaust gas treatment device, adapted for use in a sewage station or a sewage lift pump station, comprising: the system comprises a primary tower, a secondary tower, a primary tower spraying layer (3), a primary tower demisting layer (4), an ozone aeration disc (5) and a secondary tower spraying layer (8);
the primary tower spraying layer (3), the primary tower demisting layer (4) and the ozone aeration disc (5) are sequentially arranged in the primary tower along the flow direction of waste gas;
the secondary tower spraying layer (8) is arranged in the secondary tower;
the gas outlet of the first-stage tower is connected with the gas inlet of the second-stage tower;
the primary tower spraying layer (3) is used for spraying mixed liquid which generates oxidation reaction with the entering waste gas, the ozone aeration disc (5) is used for introducing ozone which generates homogeneous reaction with the demisted waste gas, and the secondary tower spraying layer (8) is used for spraying alkali liquor which is absorbed and neutralized with decomposition products of the waste gas.
2. The exhaust gas treatment equipment according to claim 1, wherein the number of the primary tower spray levels (3) is plural, and the plural primary tower spray levels (3) are sequentially arranged in the primary tower along the exhaust gas flow direction;
and/or the number of the secondary tower spraying layers (8) is multiple, and the multiple secondary tower spraying layers (8) are sequentially arranged in the secondary tower along the flow direction of waste gas.
3. An exhaust gas treatment plant according to claim 1, characterized in that the primary tower spray levels (3) and/or the secondary tower spray levels (8) are sprayed in a direction opposite to the exhaust gas flow direction.
4. An exhaust gas treatment device according to claim 1, further comprising a flow guiding layer (6) arranged downstream of the ozone aeration disc (5).
5. The exhaust gas treatment apparatus of claim 1, further comprising: a second-stage tower demisting layer (9);
the secondary tower demisting layers (9) are arranged at the downstream of the secondary tower spraying layer (8).
6. The exhaust gas treatment apparatus of claim 1, further comprising: a first-stage tower circulating water tank (10) and a first-stage tower circulating pump (11);
the primary tower circulating water tank (10) is arranged at the bottom of the primary tower and is used for collecting mixed liquid of alkali liquor and an oxidant in the primary tower;
the primary tower circulating water tank (10) is communicated with the primary tower spraying layer (3) through the primary tower circulating pump (11).
7. The exhaust gas treatment apparatus of claim 6, further comprising: a secondary tower circulating water tank (14) and a secondary tower circulating pump (15);
the secondary tower circulating water tank (14) is arranged at the bottom of the secondary tower and is used for collecting alkali liquor in the secondary tower;
the secondary tower circulating water tank (14) is communicated with the secondary tower demisting layer (9) through the secondary tower circulating pump (15).
8. The exhaust gas treatment apparatus of claim 7, further comprising: an oxidant storage tank (12), an oxidant pump (13), an alkali liquor storage tank (16) and an alkali liquor pump (17);
the oxidant storage tank (12) is communicated with an outlet of the primary tower circulating pump (11) through the oxidant pump (13);
the lye storage tank (16) is communicated with the primary tower circulating water tank (10) and/or the secondary tower circulating water tank (14) through the lye pump (17).
9. An exhaust gas treatment device according to claim 1, further comprising an ozone tail gas alarm (19) provided at the outlet (2) of the secondary tower.
10. An exhaust gas treatment method, characterized by comprising the steps of:
s1, contacting the waste gas with a mixed solution, wherein the mixed solution comprises an oxidant and alkali liquor;
s2, demisting the waste gas;
s3, introducing ozone to enable the ozone and the exhaust gas to generate a homogeneous reaction;
s4, absorbing and neutralizing the products of the waste gas oxidative decomposition.
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| CN114432862A (en) * | 2022-02-21 | 2022-05-06 | 李存佩 | Ozone deodorizer |
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