CN116036835A - Lithium battery electrolyte waste gas treatment system - Google Patents
Lithium battery electrolyte waste gas treatment system Download PDFInfo
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- CN116036835A CN116036835A CN202211715494.2A CN202211715494A CN116036835A CN 116036835 A CN116036835 A CN 116036835A CN 202211715494 A CN202211715494 A CN 202211715494A CN 116036835 A CN116036835 A CN 116036835A
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- 239000002912 waste gas Substances 0.000 title claims abstract description 68
- 239000003792 electrolyte Substances 0.000 title claims abstract description 25
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims description 21
- 229910052744 lithium Inorganic materials 0.000 title claims description 21
- 238000005406 washing Methods 0.000 claims abstract description 48
- 239000007789 gas Substances 0.000 claims abstract description 40
- 239000000126 substance Substances 0.000 claims abstract description 37
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 34
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000010457 zeolite Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 230000002378 acidificating effect Effects 0.000 claims abstract description 23
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims abstract description 21
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 21
- 238000001179 sorption measurement Methods 0.000 claims abstract description 19
- 238000003795 desorption Methods 0.000 claims abstract description 15
- 238000007084 catalytic combustion reaction Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000012545 processing Methods 0.000 claims abstract description 7
- 238000007791 dehumidification Methods 0.000 claims abstract description 4
- 230000007613 environmental effect Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 15
- 230000003197 catalytic effect Effects 0.000 claims description 9
- 238000011045 prefiltration Methods 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 238000006864 oxidative decomposition reaction Methods 0.000 claims description 4
- 239000003463 adsorbent Substances 0.000 claims description 3
- 239000003814 drug Substances 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 2
- 239000010815 organic waste Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 4
- 239000005416 organic matter Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 229910003002 lithium salt Inorganic materials 0.000 description 2
- 159000000002 lithium salts Chemical class 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- -1 lithium hexafluorophosphate Chemical compound 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000002918 waste heat Substances 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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- 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
- B01D53/04—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 stationary adsorbents
-
- 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
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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
- B01D53/14—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
- B01D53/1456—Removing acid components
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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
- B01D53/14—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
- B01D53/1487—Removing organic compounds
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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
- B01D53/14—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
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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
- B01D53/26—Drying gases or vapours
- B01D53/266—Drying gases or vapours by filtration
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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
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
-
- 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
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention relates to a battery electrolyte waste gas treatment system, which comprises a pretreatment system and a main treatment system which are matched for use; the pretreatment system comprises: the device comprises a buffer tank, an alkaline washing tower, a water washing tower, a demister, a NaOH dosing tank, a circulating water pump and a dosing pump; the main processing system includes: the device comprises a filter, a zeolite rotating wheel, an adsorption fan, a heater, a heat exchanger, a catalytic combustion device, a desorption fan, a flame arrester, a pneumatic control valve and an exhaust barrel; the waste gas is subjected to pretreatment of removing acidic fluoride substances through alkaline washing, removing residual acidic substances and partial organic substances through water washing and removing fluoride substances through demisting by a pretreatment system, and then enters a main treatment system to be subjected to pretreatment filter heating and dehumidification and zeolite rotating wheel treatment, and finally clean gas meeting the environmental protection requirement is discharged.
Description
Technical Field
The invention relates to an environment-friendly technology, in particular to an exhaust gas treatment technology, and specifically relates to an exhaust gas treatment system for lithium battery electrolyte.
Background
The lithium ion battery electrolyte is generally composed of lithium hexafluorophosphate as a lithium salt and a carbonate-based organic solvent, and the carbonate-based organic solvent is generally ethylene carbonate, propylene carbonate, diethyl carbonate, dimethyl carbonate and the like.
The electrolyte production process mainly comprises the processes of solvent filtration, water removal, blending, packaging and the like, wherein waste gas is generated in the processes, and the main pollutants are carbonates and contain a small amount of fluoride.
The waste gas treatment of lithium battery electrolyte at present has the problems to be solved:
1) The conventional activated carbon adsorption process has the disadvantages that activated carbon cannot be regenerated, the replacement period is short, the operation cost is high, and secondary pollution is generated;
2) The pollutant concentration in the waste gas fluctuates greatly, and the pollutant concentration is lower in more than 90 percent of time, and the energy consumption is higher by adopting an RTO incineration process;
3) Hydrogen fluoride generated by the reaction of electrolyte lithium salt and water is easy to cause poisoning of noble metal catalyst and corrode equipment;
4) Traditional defroster, defogging effect is relatively poor, and fluorine-containing material is carried to subsequent processing equipment by the water smoke clamp easily, causes the corruption to equipment.
Accordingly, there is a need for a lithium battery electrolyte exhaust gas treatment system that addresses the above-described issues.
Disclosure of Invention
The invention aims to provide a lithium battery electrolyte waste gas treatment system.
The invention realizes the aim through the following technical scheme:
the technical scheme is as follows:
a lithium battery electrolyte waste gas treatment system comprises a pretreatment system and a main treatment system which are matched for use;
the pretreatment system comprises: the device comprises a buffer tank, an alkaline washing tower, a water washing tower, a demister, a NaOH dosing tank, a circulating water pump and a dosing pump;
the main processing system includes: the device comprises a filter, a zeolite rotating wheel, an adsorption fan, a heater, a heat exchanger, a catalytic combustion device, a desorption fan, a flame arrester, a pneumatic control valve and an exhaust barrel;
the waste gas is subjected to pretreatment of removing acidic fluoride substances through alkaline washing, removing residual acidic substances and partial organic substances through water washing and removing fluoride substances through demisting by a pretreatment system, and then enters a main treatment system to be subjected to pretreatment filter heating and dehumidification and zeolite rotating wheel treatment, and finally clean gas meeting the environmental protection requirement is discharged.
Further, the waste gas comprises the tail gas of the lithium battery electrolyte process, the tail gas collected by a gas collecting hood, the exhausted tail gas of a tank area, the partial gas collecting hood between the washing barrels and the waste gas generated by space ventilation, the waste gas firstly enters a buffer tank after being provided with power by an adsorption fan, the residence time is about 1s, the waste gas is uniformly mixed, and then alkaline washing is carried out to remove acidic fluoride substances.
Further, the removal of acidic fluorinated substances by alkaline washing is specifically: the waste gas which is uniformly mixed enters an alkaline washing tower, the flow rate of a packing layer is 1.2m/s, the effective residence time is about 2s, acidic fluorinated substances in the waste gas are removed through absorption liquid, and the removal capacity is enhanced by adding sodium hydroxide.
Further, the liquid medicine of the alkaline washing tower is respectively sent into a water tank of the washing tower by a dosing metering pump and mixed with the circulating liquid in the washing tower, the circulating mixed liquid is pumped to two layers of spiral nozzles at the upper end of the tower body by the circulating water pump, and is sprayed out at high speed through the nozzles to form countless fine fog drops; the dosing is controlled by a pH on-line monitoring instrument in a water tank of the washing tower, and the pH value is set to be 8-10.
Further, the method for removing the residual acidic substances and part of organic matters by water washing comprises the following steps: the waste gas enters the water washing tower again, the flow rate of the packing layer is 1.2m/s, the effective residence time is about 2s, and acidic substances and partial organic substances in the waste gas are removed through the absorption liquid.
Further, the demisting fluoride removal specifically comprises: the waste gas after washing is defogged by a defogger, the defogging filler thickness in defogging is 500mm, and simultaneously, the special fluoride adsorbent with the thickness of 200mm is filled.
Further, the heating and dehumidifying of the prefilter is specifically as follows: the waste gas after fluoride removal enters a prefilter, a heating section is arranged in the prefilter, the heating temperature is 26 ℃, and the humidity of the waste gas entering the zeolite rotating wheel is ensured to be lower than 80%.
Further, the zeolite rotating wheel treatment comprises heat exchange of the zeolite rotating wheel, fresh air is used for cooling, the temperature of the cooled air is about 122 ℃, and the cooled air enters a heat exchanger and a heater and is heated to 200-220 ℃.
Further, the waste gas enters a desorption area of the zeolite rotating wheel to regenerate the adsorbed organic matters, the desorption area is powered by a desorption fan, the waste gas enters a heat exchanger to heat the temperature to 158 ℃, and catalytic oxidative decomposition is carried out by a catalytic combustion device.
Further, the zeolite wheel treatment also includes zeolite wheel adsorption: the waste gas enters an adsorption zone of the zeolite rotating wheel, and after the organic matters in the waste gas are adsorbed and removed, the waste gas is discharged into an exhaust funnel through an adsorption fan.
Compared with the prior art, the invention has the beneficial effects that: compact structure, reasonable in layout, through preliminary treatment and main treatment to waste gas carry out high-efficient purification, guarantee that the waste gas after the processing accords with the emission requirement.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
FIG. 2 is a second schematic structural view of the present invention.
Detailed Description
The embodiment shows a lithium battery electrolyte waste gas treatment system, which comprises a pretreatment system and a main treatment system which are matched for use;
referring to fig. 1, the preprocessing system includes: a buffer tank 1, an alkaline washing tower 2, a water washing tower 3, a demister 4, a NaOH dosing tank 5, a circulating water pump 6 and a dosing pump 7;
referring to fig. 2, the main processing system includes: the device comprises a filter 8, a zeolite rotating wheel 9, an adsorption fan 10, a heater 11, a heat exchanger 12, a catalytic combustion device 13, a desorption fan 14, a flame arrester 15, a pneumatic control valve 16 and an exhaust drum 17;
the waste gas is subjected to pretreatment of removing acidic fluoride substances through alkaline washing, removing residual acidic substances and partial organic substances through water washing and removing fluoride substances through demisting by a pretreatment system, and then enters a main treatment system to be subjected to pretreatment filter heating and dehumidification and zeolite rotating wheel treatment, and finally clean gas meeting the environmental protection requirement is discharged.
The waste gas comprises the process tail gas of the lithium battery electrolyte, the tail gas collected by the gas collecting hood, the emptying tail gas of the tank area, the partial gas collecting hood between the washing barrels and the waste gas generated by space ventilation, and the waste gas firstly enters the buffer tank 1 after being provided with power by the adsorption fan, stays for about 1s, is uniformly mixed, and then is subjected to alkaline washing to remove acidic fluoride substances.
The alkali washing to remove acidic fluoridized substances comprises the following steps: the waste gas which is evenly mixed enters an alkaline washing tower 2, the flow rate of a packing layer is 1.2m/s, the effective residence time is about 2s, acidic fluorinated substances in the waste gas are removed through absorption liquid, and the removal capacity is enhanced by adding sodium hydroxide.
The liquid medicine in the alkaline washing tower 2 is sent into a water tank of a washing tower by a dosing metering pump 7, mixed with circulating liquid in the washing tower, and the circulating mixed liquid is sent to two layers of spiral nozzles at the upper end of the tower body by a circulating water pump 6, and sprayed out at high speed through the nozzles to form innumerable fine mist drops; the dosing is controlled by a pH on-line monitoring instrument in a water tank of the washing tower, and the pH value is set to be 8-10.
The method for removing the residual acidic substances and part of organic substances by water washing comprises the following steps: the waste gas enters the water scrubber 3 again, the flow rate of the packing layer is 1.2m/s, the effective residence time is about 2s, and acidic substances and partial organic substances in the waste gas are removed through the absorption liquid.
The demisting fluoride removal method specifically comprises the following steps: the waste gas after washing is defogged by the defogger 4, the defogging filler thickness in defogging is 500mm, and simultaneously, the special fluoride adsorbent with the thickness of 200mm is filled.
The heating and dehumidifying of the prefilter is specifically as follows: the waste gas after fluoride removal enters a prefilter 8, a heating section is arranged in the prefilter 8, the heating temperature is 26 ℃, and the humidity of the waste gas entering the zeolite rotating wheel is ensured to be lower than 80%.
The zeolite rotating wheel treatment comprises the heat exchange of the zeolite rotating wheel 9, the temperature of the air used for cooling is about 122 ℃ through fresh air, and the air enters the heat exchanger 12 and the heater 11 and is heated to 200-220 ℃.
The waste gas enters a desorption zone of the zeolite rotating wheel, the adsorbed organic matters are regenerated, power is provided by a desorption fan 14, the waste gas enters a heat exchanger 12 to heat the temperature to 158 ℃, and catalytic oxidative decomposition is carried out by a catalytic combustion device 13.
The zeolite wheel treatment also includes zeolite wheel adsorption: the waste gas enters an adsorption area of the zeolite rotating wheel 9, organic matters in the waste gas are adsorbed and removed, and then the waste gas is discharged into an exhaust funnel 17 through an adsorption fan 10.
Wherein:
the zeolite wheel 9 implements the rc+co process:
zeolite concentration runner catalytic oxidation system, abbreviated as RC+CO: the high-efficiency VOCs waste gas treatment system mainly comprises a zeolite concentration rotating wheel and a catalytic oxidation furnace: the zeolite rotating wheel is used for adsorbing VOCs pollutant, and then the high-concentration organic waste gas desorbed by the concentrating rotating wheel enters CO for oxidative decomposition.
RC process flow:
each rotating wheel is divided into three areas of an adsorption area, a cooling area and a desorption area.
And the mixed organic waste gas is adsorbed by a rotating wheel after passing through four filters. Wherein the waste gas is directly discharged to a chimney after being adsorbed and purified. The small fresh air is adopted to cool the rotating wheel molecular sieve superheating area, then an electric heating furnace is adopted to heat the waste gas to 220 ℃, the rotating wheel is adopted to analyze the adsorbed saturated part, the analyzed gas is subjected to CO catalytic oxidation, and the oxidized gas is directly discharged after purification.
CO process flow:
the zeolite with adsorbed organic matter needs to be desorbed, the desorption process is the reverse adsorption process, the organic matter adsorbed in the active carbon is blown by hot air and enters into a catalytic bed, the organic matter is thoroughly decomposed by the principle of catalytic combustion reaction, and the hot air generated by an electric heater blows off the organic matter and is discharged into the catalytic bed for further chemical treatment. Catalytic combustion: the organic waste gas firstly enters a heat exchanger, the temperature of the organic waste gas is increased by utilizing waste heat generated by catalytic combustion, then the organic waste gas enters an electric heater, and the organic waste gas is heated to a starting temperature by an electric heating tube, and the starting temperature is generally 150-300 ℃. Finally, the waste gas enters a catalytic combustion reaction device to carry out catalytic combustion reaction, so that the organic waste gas is oxidized and decomposed into carbon dioxide and water, and a large amount of heat is released. The catalyst is a core technology in the whole catalytic combustion, and the company adopts a self-produced third-generation gamma-Al 2O3 honeycomb noble metal catalyst. The air speed is large, the resistance is small, the ignition temperature is low, and the purification rate is stabilized to be more than 97%. Thereby ensuring the advancement and stability of the catalytic device. And a fan is respectively arranged at the front end and the rear end of the desorption system and is mutually standby.
Compared with the prior art, the invention has the beneficial effects that: compact structure, reasonable in layout, through preliminary treatment and main treatment to waste gas carry out high-efficient purification, guarantee that the waste gas after the processing accords with the emission requirement.
What has been described above is only some of the embodiments of the present invention. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention.
Claims (10)
1. A lithium battery electrolyte waste gas treatment system is characterized in that: comprises a pretreatment system and a main treatment system which are matched for use;
the pretreatment system comprises: the device comprises a buffer tank, an alkaline washing tower, a water washing tower, a demister, a NaOH dosing tank, a circulating water pump and a dosing pump;
the main processing system includes: the device comprises a filter, a zeolite rotating wheel, an adsorption fan, a heater, a heat exchanger, a catalytic combustion device, a desorption fan, a flame arrester, a pneumatic control valve and an exhaust barrel;
the waste gas is subjected to pretreatment of removing acidic fluoride substances through alkaline washing, removing residual acidic substances and partial organic substances through water washing and removing fluoride substances through demisting by a pretreatment system, and then enters a main treatment system to be subjected to pretreatment filter heating and dehumidification and zeolite rotating wheel treatment, and finally clean gas meeting the environmental protection requirement is discharged.
2. The lithium battery electrolyte exhaust gas treatment system according to claim 1, wherein: the waste gas comprises the process tail gas of the lithium battery electrolyte, the tail gas collected by the gas collecting hood, the exhaust gas of the tank area, the local gas collecting hood between the washing barrels and the waste gas generated by space ventilation, and the waste gas firstly enters the buffer tank after being provided with power by the adsorption fan, stays for about 1s, is uniformly mixed, and then is subjected to alkaline washing to remove acidic fluoride substances.
3. The lithium battery electrolyte exhaust gas treatment system according to claim 2, wherein: the alkali washing to remove acidic fluoridized substances comprises the following steps: the waste gas which is uniformly mixed enters an alkaline washing tower, the flow rate of a packing layer is 1.2m/s, the effective residence time is about 2s, acidic fluorinated substances in the waste gas are removed through absorption liquid, and the removal capacity is enhanced by adding sodium hydroxide.
4. A lithium battery electrolyte exhaust gas treatment system according to claim 3, wherein: the liquid medicine of the alkaline washing tower is respectively sent into a water tank of the washing tower by a dosing metering pump and mixed with circulating liquid in the washing tower, the circulating mixed liquid is pumped to two layers of spiral nozzles at the upper end of the tower body by the circulating water pump, and is sprayed out at high speed through the nozzles to form countless fine fog drops; the dosing is controlled by a pH on-line monitoring instrument in a water tank of the washing tower, and the pH value is set to be 8-10.
5. A lithium battery electrolyte exhaust gas treatment system according to claim 3, wherein: the method for removing the residual acidic substances and part of organic substances by water washing comprises the following steps: the waste gas enters the water washing tower again, the flow rate of the packing layer is 1.2m/s, the effective residence time is about 2s, and acidic substances and partial organic substances in the waste gas are removed through the absorption liquid.
6. The lithium battery electrolyte exhaust gas treatment system according to claim 5, wherein: the demisting fluoride removal method specifically comprises the following steps: the waste gas after washing is defogged by a defogger, the defogging filler thickness in defogging is 500mm, and simultaneously, the special fluoride adsorbent with the thickness of 200mm is filled.
7. The lithium battery electrolyte exhaust gas treatment system according to claim 6, wherein: the heating and dehumidifying of the prefilter is specifically as follows: the waste gas after fluoride removal enters a prefilter, a heating section is arranged in the prefilter, the heating temperature is 26 ℃, and the humidity of the waste gas entering the zeolite rotating wheel is ensured to be lower than 80%.
8. The lithium battery electrolyte exhaust gas treatment system according to claim 7, wherein: the zeolite rotating wheel treatment comprises the heat exchange of the zeolite rotating wheel, the temperature of the air used for cooling is about 122 ℃ through fresh air, and the air enters a heat exchanger and a heater to be heated to 200-220 ℃.
9. The lithium battery electrolyte exhaust gas treatment system according to claim 8, wherein: the waste gas enters a desorption zone of the zeolite rotating wheel to regenerate the adsorbed organic matters, the desorption zone is powered by a desorption fan, the waste gas enters a heat exchanger to heat the temperature to 158 ℃, and catalytic oxidative decomposition is carried out by a catalytic combustion device.
10. The lithium battery electrolyte exhaust gas treatment system according to claim 9, wherein: the zeolite wheel treatment also includes zeolite wheel adsorption: the waste gas enters an adsorption zone of the zeolite rotating wheel, and after the organic matters in the waste gas are adsorbed and removed, the waste gas is discharged into an exhaust funnel through an adsorption fan.
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| CN202211715494.2A CN116036835A (en) | 2022-12-28 | 2022-12-28 | Lithium battery electrolyte waste gas treatment system |
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| CN202211715494.2A CN116036835A (en) | 2022-12-28 | 2022-12-28 | Lithium battery electrolyte waste gas treatment system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211886052U (en) * | 2020-02-18 | 2020-11-10 | 上海兰宝环保科技有限公司 | Waste gas treatment system |
| CN112354342A (en) * | 2020-07-17 | 2021-02-12 | 万向一二三股份公司 | Lithium ion battery electrolyte waste gas treatment device and system |
| CN214551842U (en) * | 2021-02-10 | 2021-11-02 | 镇江华东电力设备制造厂有限公司 | Skid-mounted waste gas treatment system |
| CN114534440A (en) * | 2022-01-18 | 2022-05-27 | 江苏省环境工程技术有限公司 | Kerosene waste gas treatment device and process |
| CN216909722U (en) * | 2022-02-10 | 2022-07-08 | 枣庄市泰瑞精细化工有限公司 | Low concentration dust-containing VOCs treatment system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN211886052U (en) * | 2020-02-18 | 2020-11-10 | 上海兰宝环保科技有限公司 | Waste gas treatment system |
| CN112354342A (en) * | 2020-07-17 | 2021-02-12 | 万向一二三股份公司 | Lithium ion battery electrolyte waste gas treatment device and system |
| CN214551842U (en) * | 2021-02-10 | 2021-11-02 | 镇江华东电力设备制造厂有限公司 | Skid-mounted waste gas treatment system |
| CN114534440A (en) * | 2022-01-18 | 2022-05-27 | 江苏省环境工程技术有限公司 | Kerosene waste gas treatment device and process |
| CN216909722U (en) * | 2022-02-10 | 2022-07-08 | 枣庄市泰瑞精细化工有限公司 | Low concentration dust-containing VOCs treatment system |
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