CN113694699B - Chemical waste gas centralized treatment system - Google Patents
Chemical waste gas centralized treatment system Download PDFInfo
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- CN113694699B CN113694699B CN202111127506.5A CN202111127506A CN113694699B CN 113694699 B CN113694699 B CN 113694699B CN 202111127506 A CN202111127506 A CN 202111127506A CN 113694699 B CN113694699 B CN 113694699B
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- 239000007789 gas Substances 0.000 title claims abstract description 82
- 239000002894 chemical waste Substances 0.000 title claims abstract description 12
- 239000002912 waste gas Substances 0.000 claims abstract description 81
- 238000012545 processing Methods 0.000 claims abstract description 16
- 238000004880 explosion Methods 0.000 claims abstract description 9
- 238000001179 sorption measurement Methods 0.000 claims abstract description 8
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 16
- 238000002485 combustion reaction Methods 0.000 claims description 15
- 238000011084 recovery Methods 0.000 claims description 15
- 239000010865 sewage Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 229910021536 Zeolite Inorganic materials 0.000 claims description 14
- 239000010457 zeolite Substances 0.000 claims description 14
- HYHCSLBZRBJJCH-UHFFFAOYSA-M sodium hydrosulfide Chemical compound [Na+].[SH-] HYHCSLBZRBJJCH-UHFFFAOYSA-M 0.000 claims description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 238000011068 loading method Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000010812 mixed waste Substances 0.000 claims description 6
- 238000005338 heat storage Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 238000003795 desorption Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 3
- 229910021529 ammonia Inorganic materials 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 3
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 2
- 238000006477 desulfuration reaction Methods 0.000 claims description 2
- 230000023556 desulfurization Effects 0.000 claims description 2
- 230000000241 respiratory effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 30
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000003009 desulfurizing effect Effects 0.000 abstract 1
- 230000003139 buffering effect Effects 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000005201 scrubbing Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000010908 plant waste Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
Classifications
-
- 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
- B01D53/14—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 by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- 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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
- B01D53/06—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 by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
-
- 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
- B01D53/62—Carbon oxides
-
- 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
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
- F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
- F23G7/066—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel preheating the waste gas by the heat of the combustion, e.g. recuperation type incinerator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
- B01D2253/108—Zeolites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
-
- 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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a chemical waste gas centralized treatment system, and mainly relates to the field of waste gas treatment processes. Comprises a pretreatment unit for collecting and pretreating various waste gases, deoiling, deaminizing and desulfurizing; the collecting unit is configured to collect and collect the pressurized waste gas of the first processing module, the second processing module and the third processing module, dilute the pressurized waste gas to below 25% of the explosion lower limit of the mixed gas and then convey the diluted waste gas to the rear end; and an incineration unit configured to burn the diluted mixed gas, wherein the burning temperature is 600-800 ℃. The invention has the beneficial effects that: the method adopts a mode of combining a chemical absorption method, a physical adsorption method and an incineration method to intensively treat the waste gas, so as to ensure that the discharged waste gas is recycled and reaches the discharge standard.
Description
Technical Field
The invention relates to the field of waste gas treatment processes, in particular to a chemical waste gas centralized treatment system.
Background
Along with the increasing requirement of industry development on environmental protection, in particular, in the release of notification about further treatment of volatile organic compounds by Shandong province, various gases are clearly required to be burnt, the existing treatment mode of waste gas is difficult to meet the related requirements and regulations, and the burden on the environment is gradually increased.
At present, three methods of chemical plant waste gas treatment mainly include a chemical absorption method, a physical absorption method and an incineration method, and the existing multiple plants only adopt one of the methods, so that the method is single, organic volatile gas cannot be effectively removed, and the treated waste gas still does not reach the standard and still causes pollution to the environment.
Disclosure of Invention
The invention aims to provide a chemical waste gas centralized treatment system which adopts a mode of combining a chemical absorption method, a physical adsorption method and an incineration method to perform centralized treatment on waste gas, so as to ensure that the discharged waste gas is recycled and reaches the discharge standard.
The invention aims to achieve the aim, and the aim is achieved by the following technical scheme:
A chemical waste gas centralized treatment system, comprising: the pretreatment unit comprises a first treatment module, a second treatment module and a third treatment module;
the first treatment module is configured to collect and boost the sewage treatment waste gas and sodium hydrosulfide loading tail gas in a sealing manner;
The second treatment module is configured to independently collect the waste gas of the acid water storage tank and the tail gas of the sodium hydrosulfide tank area, and after ammonia is eluted by water and hydrogen sulfide is eluted by alkali, the pressure is increased;
the third treatment module is configured to collect oil-containing waste gas, and boost the pressure after oil gas recovery;
the collecting unit is configured to collect and collect the pressurized waste gas of the first processing module, the second processing module and the third processing module, dilute the pressurized waste gas to below 25% of the explosion lower limit of the mixed gas and then convey the diluted waste gas to the rear end;
And an incineration unit configured to burn the diluted mixed gas, wherein the burning temperature is 600-800 ℃.
Further, the NMHC concentration of the sewage treatment waste gas is more than or equal to 500mg/m < 3 >, and the sewage treatment waste gas comprises sewage regulating tank waste gas, oil separation tank waste gas and floatation tank waste gas.
Further, the first treatment module comprises a first closed pipeline and a first pressurizing unit, exhaust gas of each sewage treatment tank and sodium hydrosulfide loading tail gas are respectively collected in a sealing mode through the first closed pipeline, and the exhaust gas can be communicated into the tail gas recovery treatment header pipe after being pressurized through the first pressurizing unit.
Further, the second treatment module comprises a second independent pipeline, and a water scrubber, an alkaline scrubber and a second pressurizing unit are sequentially arranged on the second independent pipeline according to the airflow conveying direction.
Further, the oil-containing waste gas comprises loading and unloading car oil gas and storage tank breathing oil gas.
Further, the tail gas recovery treatment main pipe comprises a front-section main pipe, a buffer main pipe and a rear-section main pipe which are sequentially communicated according to the trend of the air flow;
The front-end main pipe is connected with the liquid separating tank, the air outlet end of the liquid separating tank is connected with the buffer main pipe, a fan is arranged on the buffer main pipe, air is introduced into the buffer main pipe through the fan to dilute mixed waste gas, and the rear-end main pipe is used for communicating the buffer main pipe with the incineration unit.
Furthermore, an LEL on-line monitoring system is matched on the buffer main pipe, when the concentration of the waste gas is higher than the lower limit of the mixed explosion by 1/4 or higher than the set value of the concentration of the mixed waste gas, a fan in the system is stopped, and meanwhile, a self-protection valve of an outlet of the fan is closed.
Further, the incineration unit comprises a pretreatment module, a zeolite rotating wheel concentration module and a heat accumulation combustion module;
The pretreatment module comprises a primary filter, a middle-effect filter and a high-efficiency filter, wherein the primary filter mainly removes particles with the particle size of more than or equal to 5 microns, the middle-effect filter removes particles with the particle size of 1-5 microns, and the high-efficiency filter is used for removing particles with the particle size of less than 1 micron;
the zeolite rotating wheel concentration module is used for adsorbing and concentrating at 180-220 ℃, modified zeolite is used as an adsorption material, the zeolite content is more than 70%, the zeolite rotating wheel carries out high-temperature back blowing by hot gas of RTO in a desorption zone, and the desorbed concentrated waste gas enters the heat storage combustion module;
the heat accumulating combustion module adopts a heat accumulating three-chamber RTO incinerator, the combustion hearth is 760-800 ℃, and organic matters in the waste gas are combusted into carbon dioxide and water, so that harmless emission is realized.
Compared with the prior art, the invention has the beneficial effects that:
The system adopts a mode of combining a chemical absorption method, a physical adsorption method and an incineration method to intensively treat the waste gas, so as to ensure that the discharged waste gas is recycled and reaches the discharge standard. When the waste gas treatment is carried out by adopting the incineration process, the explosion limit of the waste gas is systematically evaluated, and the safety control method is adopted to carry out the safety accounting of the explosion limit. Realizing safe treatment and standard discharge. Meanwhile, various waste gases can be treated, and the application range is wide.
Drawings
Fig. 1 is a process flow diagram of the present invention.
Detailed Description
The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. Further, it will be understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the application, and equivalents thereof fall within the scope of the application as defined by the claims.
The instruments, reagents, materials, etc. used in the examples described below are conventional instruments, reagents, materials, etc. known in the art, and are commercially available. The experimental methods, detection methods, and the like in the examples described below are conventional experimental methods, detection methods, and the like that are known in the prior art unless otherwise specified.
Example 1: chemical waste gas centralized treatment system
The system can be used for carrying out centralized collection and treatment on various waste gases, and after the waste gases enter a tail gas recovery treatment main pipe in a summarizing mode, the waste gases are subjected to unified incineration treatment. And can accommodate and burn various waste gases, and the pretreatment procedure of various waste gases is needed. Therefore, the system mainly comprises the following procedures:
1. pretreatment unit
The pretreatment device is used for integrating pretreatment before incineration aiming at different waste gases, so that the gas can meet the incineration requirement and meet the discharge requirement after incineration.
The pretreatment unit comprises a first treatment module, a second treatment module and a third treatment module;
the first treatment module is used for receiving sewage treatment waste gas and sodium hydrosulfide loading tail gas, and the NMHC concentration of the sewage treatment waste gas is more than or equal to 500mg/m 3, and the sewage treatment waste gas comprises sewage regulating tank waste gas, oil separation tank waste gas, air floatation tank waste gas and the like.
The first treatment module comprises a first closed pipeline and a first pressurizing unit, exhaust gas of each sewage treatment tank and sodium hydrosulfide loading tail gas are respectively collected in a sealing mode through the first closed pipeline, the first pressurizing unit is a fan (fan P1101 in the drawing and is arranged in a sewage treatment station), the first pressurizing unit is arranged on the first closed pipeline, and the first pressurizing unit can be communicated with a tail gas recovery treatment header pipe after being pressurized through the fan.
1.2 The second treatment module is used for receiving the waste gas of the acid water storage tank (a product tank, a middle tank and a raw material water tank) and the tail gas of the sodium hydrosulfide tank area (a tail gas absorption tower).
The second treatment module comprises a second independent pipeline, a second pressurizing unit, a water scrubber and an alkaline scrubber, wherein the second independent pipeline is used for respectively collecting and integrating the waste gas of the acid water storage tank and the tail gas of the sodium hydrosulfide tank area, respectively and serially connecting the water scrubber, the alkaline scrubber and a fan P1104 serving as the second pressurizing unit along the gas flowing direction, removing impurities such as ammonia from the waste gas through water scrubbing, removing impurities such as hydrogen sulfide and carbon dioxide through alkaline scrubbing, pressurizing the waste gas through the fan P1104 and then entering the tail gas recovery treatment main pipe;
1.3 the third treatment module is configured to receive an oily waste gas, where the oily waste gas includes a lift truck oil gas and a storage tank breathing oil gas;
The third treatment module comprises a third pipeline and an oil gas recovery unit, wherein the third pipeline collects the oil gas of the loading and unloading vehicle and the respiratory oil gas of the storage tank, and the oil gas is recovered and absorbed and then is merged into a second independent pipeline of the rear section of the desulfurization tail gas passing through the alkaline washing tower, and the second independent pipeline is pressurized by a fan P1104 and then enters a tail gas recovery treatment main pipe;
2. Summarizing unit
The summarizing unit comprises a tail gas recovery processing main pipe, and the tail gas recovery processing main pipe comprises a front-section main pipe, a buffer main pipe and a rear-section main pipe which are sequentially communicated according to the trend of air flow;
The front end main pipe has its end connected to the liquid separating tank as buffering tank, the liquid separating tank has its outlet connected to the buffering main pipe, and the buffering main pipe has dilution unit for introducing air to dilute exhaust gas, and the blower P1103 as the dilution unit is used to introduce air for dilution to below 25% of the lower explosion limit of mixed gas after the tail gas is collected.
And a set of LEL on-line monitoring system is further arranged on the buffer main pipe, so that the concentration of the process waste gas is higher, and whether the air quantity of the process waste gas is safe or not is analyzed by a safety control method. And a set of LEL on-line monitoring system is additionally arranged at the front end of the gas inlet and waste gas furnace, the monitoring system and the fresh air fan are in linkage control with the waste gas fan, and when the concentration of waste gas is higher than the lower limit of mixed explosion by 1/4 (or higher than the set value of mixed waste gas concentration), the fresh air fan and the waste gas fan are stopped, and meanwhile, the self-protection valve of the outlet of the waste gas fan is closed, so that the safety of the whole system is effectively ensured.
3. Incineration unit
The incineration unit is connected with the rear-end main pipe and is used for incinerating diluted mixed waste gas.
The incineration unit comprises a pretreatment module, a zeolite rotating wheel concentration module and a heat storage combustion module;
The pretreatment module is of a three-stage filtering structure and comprises a primary filter, a middle-effect filter and a high-efficiency filter, wherein the primary filter mainly removes particles larger than or equal to 5 microns, the middle-effect filter removes particles of 1-5 microns, the high-efficiency filter is used for removing particles smaller than 1 micron, and the particles are removed and then enter the follow-up module.
The zeolite rotating wheel concentration module is specifically a zeolite rotating wheel concentration device, adsorption concentration is carried out at 180-220 ℃, modified zeolite is adopted as an adsorption material, the zeolite content is more than 70%, 10-40 times concentration can be realized, the purification efficiency can reach 90-98%, the zeolite rotating wheel slowly rotates at the rotating speed of 2-4 rpm, adsorption purification, desorption regeneration and cooling work are carried out simultaneously, the zeolite enters a desorption area towards saturation, high-temperature back blowing is carried out by hot gas of RTO, and the desorbed concentrated waste gas enters a heat storage combustion module.
The heat accumulating combustion module adopts a heat accumulating three-chamber RTO incinerator, the combustion hearth is 760-800 ℃, and organic matters in the waste gas are combusted into carbon dioxide and water, so that harmless emission is realized.
After the system operates in the park, the effect is good, and the system has the following advantages:
(1) The method combines the chemical absorption method, the physical absorption method and the incineration method to intensively treat the waste gas, thereby ensuring that the discharged waste gas reaches the standard.
(2) And a set of LEL on-line monitoring system is additionally arranged at the front end of the gas inlet and waste gas furnace, and the monitoring system, the fresh air fan and the waste gas fan are controlled in a linkage manner, so that the safety of the whole system is effectively ensured.
(3) The waste gas combustion heating furnace adopts a low-nitrogen burner, and indexes of nitrogen oxides and sulfur dioxide in combustion exhaust smoke all accord with national standards.
(4) The waste gas burning heating furnace is mainly used for feeding and heating the raw oil fractionating tower, and the consumption of coal gas can be reduced by the incorporation of waste gas, so that the purposes of energy saving and consumption reduction are realized.
Claims (5)
1. A chemical waste gas centralized processing system, comprising:
The pretreatment unit comprises a first treatment module, a second treatment module and a third treatment module;
The first treatment module is configured to treat waste gas and sodium hydrosulfide from the tail of a car
Collecting and pressurizing the gas in a sealing way;
The second treatment module is configured to independently collect the waste gas of the acid water storage tank and the tail gas of the sodium hydrosulfide tank area, and after ammonia is eluted by water and hydrogen sulfide is eluted by alkali, the pressure is increased;
the third treatment module is configured to collect the oil-containing waste gas after oil gas recovery
Pressurizing;
The collecting unit is configured to collect and collect the pressurized waste gas of the first processing module, the second processing module and the third processing module, dilute the pressurized waste gas to below 25% of the explosion lower limit of the mixed gas and then convey the diluted waste gas to the rear end;
an incineration unit configured to burn the diluted mixed gas at a combustion temperature of 600-800 ℃;
The first treatment module comprises a first closed pipeline and a first pressurizing unit, the exhaust gas of each sewage treatment tank and the sodium hydrosulfide loading exhaust gas are respectively collected in a closed mode through the first closed pipeline, and the exhaust gas can be communicated into the exhaust gas recovery treatment header pipe after being pressurized through the first pressurizing unit;
the second treatment module comprises a second independent pipeline, and a water washing tower, an alkaline washing tower and a second pressurizing unit are sequentially arranged on the second independent pipeline according to the airflow conveying direction;
The third treatment module comprises a third pipeline and an oil gas recovery unit, wherein the third pipeline collects the oil gas of the loading and unloading vehicle and the respiratory oil gas of the storage tank, and the oil gas is recovered and absorbed and then is merged into a second independent pipeline of the rear section of the desulfurization tail gas passing through the alkaline washing tower, and the second independent pipeline is pressurized by a fan and then enters a tail gas recovery treatment main pipe;
the tail gas recovery treatment main pipe comprises a front-section main pipe, a buffer main pipe and a rear-section main pipe which are sequentially communicated according to the trend of the air flow;
The front-section main pipe is connected with the liquid separating tank at the end, the air outlet end of the liquid separating tank is connected with the buffer main pipe, a fan is arranged on the buffer main pipe, air is introduced into the buffer main pipe through the fan to dilute mixed waste gas, and the rear-section main pipe is used for communicating the buffer main pipe with the incineration unit.
2. The chemical waste gas centralized processing system according to claim 1, wherein the NMHC concentration of the sewage treatment waste gas is more than or equal to 500mg/m3, and the sewage treatment waste gas comprises sewage regulating tank waste gas, oil separation tank waste gas and floatation tank waste gas.
3. The chemical waste gas centralized processing system as claimed in claim 1, wherein the oil-containing waste gas comprises a lift truck oil gas and a storage tank breathing oil gas.
4. The chemical waste gas centralized processing system according to claim 1, wherein the buffer main pipe is matched with an LEL on-line monitoring system, when the waste gas concentration is higher than the mixed explosion lower limit by 1/4 or higher than the mixed waste gas concentration set value, a fan in the system is stopped, and meanwhile, a self-protection valve of a fan outlet is closed.
5. The chemical waste gas centralized processing system according to claim 1, wherein the incineration unit comprises a pretreatment module, a zeolite rotating wheel concentration module and a heat storage combustion module;
The pretreatment module comprises a primary filter, a middle-effect filter and a high-efficiency filter, wherein the primary filter mainly removes particles with the particle size of more than or equal to 5 microns, the middle-effect filter removes particles with the particle size of 1-5 microns, and the high-efficiency filter is used for removing particles with the particle size of less than 1 micron;
The zeolite rotating wheel concentration module is used for adsorbing and concentrating at 180-220 ℃, modified zeolite is used as an adsorption material, the zeolite content is more than 70%, the zeolite rotating wheel carries out high-temperature back blowing by hot gas of RTO in a desorption zone, and the desorbed concentrated waste gas enters the heat storage combustion module;
the heat accumulating combustion module adopts a heat accumulating three-chamber RTO incinerator, the combustion hearth is 760-800 ℃, and organic matters in the waste gas are combusted into carbon dioxide and water, so that harmless emission is realized.
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