CN111760435A - Waste gas treatment method - Google Patents
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- 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
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- 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
- B01D53/1406—Multiple stage absorption
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- 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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- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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- 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
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- 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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- B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
- B01D2259/804—UV light
Abstract
The invention discloses a waste gas treatment method, wherein the waste gas is generated in the recovery process of waste lithium ion power batteries, the recovery process of the waste lithium ion power batteries sequentially comprises the steps of disassembling and shelling, evaporating, drying and crushing and sorting, and the waste gas treatment method comprises the following steps: waste gas generated in the disassembling and shelling process is subjected to two-stage alkali liquor spraying, fine filtration and dehumidification, UV photolysis and active carbon adsorption treatment in sequence; the waste gas generated in the evaporation drying process is sequentially treated in a lime adsorption mode, a TO or RTO combustion mode; and the dust generated in the crushing and sorting process is removed in a bag dust removal and electrostatic dust removal mode in sequence. The waste gas treatment method is used for carrying out targeted sectional treatment, so that the waste gas treatment in the waste lithium ion power battery recovery process is purposeful, the secondary pollution is greatly reduced, the environment-friendly operation cost is reduced, and the harmless emission is realized.
Description
Technical Field
The invention belongs to the technical field of lithium ion battery recovery processing, and particularly relates to a waste gas processing method in a waste lithium ion power battery recovery process.
Background
The lithium ion power battery has the characteristics of long service life, high safety, no memory effect and the like, is widely applied to a matching battery system of a mainstream new energy automobile, and the retirement peak period of the lithium ion power battery is gradually coming by calculating the average service life (4-8 years for small passenger vehicles and 3-5 years for large commercial vehicles).
Lithium ion batteries contain toxic and harmful electrolyte (a mixed solvent of lithium hexafluorophosphate, ethylene carbonate, dimethyl carbonate, diethyl carbonate, and the like), and lithium hexafluorophosphate reacts to generate fluorine-containing substances such as hydrogen fluoride and phosphorus pentafluoride when exposed to air or heated, resulting in a great environmental pollution. In addition, the waste lithium ion batteries are various in types and recovery methods, and in the whole recovery process, the generated waste gas and main pollutants comprise non-methane total hydrocarbons, fluorine-containing compounds, dust and the like, and can be discharged after being purified.
The application number 201610872053.1 of Chinese patent application discloses a processing apparatus and method for organic waste gas generated in the recovery process of power lithium battery, which carries out gas-solid separation on the organic waste gas, and carries out condensation processing after the alkali liquor is sprayed and washed.
The Chinese patent application with the application number of 201711464757.6 discloses a method and a system for treating waste gas generated in the process of lithium battery recovery treatment, wherein the method adopts cyclone dust removal and dry-wet filtration to the waste gas in a primary crushing procedure and a multistage crushing and sorting procedure; cyclone dust removal, dry filtration and condensation are adopted for waste gas in the drying procedure, and finally the waste gas treated in each procedure is absorbed by active carbon and then discharged. Although the treatment system for the lithium battery recovered waste gas is distinguished according to the working procedures, the treatment method is too simple, the treatment of the fluorine-containing compound is difficult to achieve the real standard emission only by activated carbon adsorption, and meanwhile, the treatment method has no popularization significance no matter from the working strength and frequency of activated carbon filling and feeding or from economic accounting of dangerous waste treatment of the polluted activated carbon.
The Chinese patent application with the application number of 201910866458.8 discloses a method and a system for purifying waste gas in the lithium battery recovery process, wherein the waste gas generated in the lithium battery recovery process is firstly subjected to a dust removal device to remove dust-containing particles in the waste gas, then a majority of fluorine-containing components in the waste gas are removed by a two-stage circulating absorption tower, the waste gas after the fluorine-containing components are removed is subjected to high-temperature combustion or medium-temperature catalytic combustion to remove volatile organic matters in the waste gas, and then the waste gas is subjected to waste heat recovery and enters an alkali absorption tower to remove residual trace hydrogen fluoride. The method has the problems of low concentration of non-methane total hydrocarbons in the waste gas, low combustion efficiency and poor energy consumption and economy, and meanwhile, most of the non-methane total hydrocarbons in the waste gas enter the waste water, so that the COD content in the waste water is greatly increased, and the difficulty is brought to the subsequent waste water treatment.
Disclosure of Invention
In view of the above, the present invention needs to provide a waste gas treatment method, which performs targeted sectional treatment on waste gases with different types, contents and concentrations generated in different recycling processes, so as to achieve targeted targeting of waste gas treatment in the recycling process of waste lithium ion power batteries, greatly reduce secondary pollution, reduce environmental protection operation cost, achieve harmless standard discharge, and solve the problems of difficult treatment of non-methane total hydrocarbons, low purification treatment efficiency of fluorine elements, difficult collection of fine particle dust, and the like in the existing waste gas treatment method.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a waste gas treatment method, wherein the waste gas is generated in the recovery process of waste lithium ion power batteries, the recovery process of the waste lithium ion power batteries sequentially comprises the steps of disassembling and shelling, evaporating, drying and crushing and sorting, and the waste gas treatment method comprises the following steps:
waste gas generated in the disassembling and shelling process is subjected to two-stage alkali liquor spraying, fine filtration and dehumidification, UV photolysis and active carbon adsorption treatment in sequence;
the waste gas generated in the evaporation drying process is sequentially treated in a lime adsorption, TO direct combustion or RTO combustion mode;
and the dust generated in the crushing and sorting process is removed in a bag dust removal and electrostatic dust removal mode in sequence, and is discharged after reaching the standard.
Furthermore, waste gas generated in the disassembling and shelling process is low-concentration organic waste gas and fluorine-containing compounds, waste gas generated in the evaporation drying process is high-concentration organic waste gas and fluorine-containing compounds, and waste gas generated in the crushing and sorting process is various types of dust.
Further, in the two-stage alkali liquor spraying, the alkali liquor adopted in the first-stage spraying is a mixed solution of 10-15% by mass of sodium hydroxide and 5-10% by mass of calcium hydroxide; the alkali liquor adopted by the second stage spraying is a mixed solution of 5-10% of sodium hydroxide and 10-15% of sodium carbonate.
Furthermore, the filter felt for fine filtration and dehumidification is synthetic fiber, and the synthetic fiber can separate particles with the diameter larger than 5 mu m.
Furthermore, the UV photolysis is performed by using 50-100 UV-C UV lamps with power of 100-250W/W.
Further, the TO direct-fired flame temperature is controlled at 700-900 ℃;
in the RTO combustion, the inlet temperature of the waste gas is 200 ℃ and the oxidation temperature is 800 ℃ and 750 ℃.
Furthermore, lime adsorption is two-stage adsorption, wherein the two-stage adsorption comprises a first stage adopting slaked lime adsorption and a second stage adopting quicklime adsorption.
Further, the cloth bag dust removal relies on the holes of the woven fabric to filter dust; the electrostatic dust collection realizes the removal of extremely tiny dust through a high-voltage electrostatic field.
Preferably, the voltage of the high-voltage electrostatic field is 60-70 KV.
Compared with the prior art, the waste gas generated in the recovery process of the waste lithium ion power battery is taken as a research object, and the method has the following beneficial effects:
in the step of disassembling and shelling, because the waste gas in the step is low-concentration organic waste gas and fluorine-containing compounds, hydrophilic organic waste gas and most fluorine elements in the waste gas enter the waste water through two-stage alkali liquor spraying; residual solid particles and water mist in the waste gas are removed through fine filtration and dehumidification, and then the interior of organic gas in the waste gas is cracked by UV photolysis to be oxidized into low molecular compounds such as pollution-free water, carbon dioxide and the like; finally, the active carbon is used for adsorption, and finally the discharge is realized.
In the evaporation drying process, because organic waste gas and fluorine content concentration are all higher, and the waste gas temperature is also higher relatively, utilize waste gas self heat, adsorb through lime and remove fluorine, the calcium fluoride purity that obtains is higher, has certain economic nature, removes fluorine earlier simultaneously, also can avoid waste gas direct combustion, and fluorine element is TO TO or RTO equipment's corruption destruction.
In the crushing and sorting process, the processing efficiency of dust particles is more important for the fact that the positive electrode material in the ternary lithium battery contains heavy metal elements such as nickel and cobalt. The pulse bag dust removal and electrostatic dust removal double-pipe simultaneous dust collection device has the advantages that dust is effectively collected while standard discharge is achieved, metal recovery rate can be improved, and economic benefits are increased.
The waste gas treatment method provided by the invention is used for carrying out sectional treatment on each procedure in the recovery process of the waste lithium ion power battery, so that the secondary pollution and the environment-friendly operation cost can be greatly reduced, the purification of valuable mobile phones and pollutants in the waste gas is effectively improved, and finally, the harmless standard-reaching emission is realized.
Drawings
FIG. 1 is a block flow diagram of the steps of the inventive exhaust treatment process.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the specific embodiments illustrated. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The invention discloses a waste gas treatment method, as shown in figure 1, mainly waste gas generated in the recovery process of waste lithium ion power batteries, wherein the recovery process of the waste lithium ion power batteries sequentially comprises the steps of dismantling and shelling, evaporation drying and crushing and sorting, wherein the dismantling and shelling, the evaporation drying and the crushing and sorting are all conventional recovery processes in the field, specifically, the dismantling and shelling are carried out in a sealed negative pressure state, and the waste gas pollutants generated in the process are less and mainly non-methane total hydrocarbon and fluorine-containing compounds; the evaporation drying is mainly carried out in an inert protective atmosphere, and in some embodiments, the battery after the disassembly and the shelling is heated to 350 ℃ of 250-3The inert protective atmosphere comprises nitrogen, helium, argon, neon and the like, the electrolyte and the binder exist in a gaseous state after evaporation and drying, and the process generates more waste gas pollutants, mainly high-concentration non-methane total hydrocarbon and fluorine-containing compounds; the crushing and sorting are mainly carried out by adopting modes of air separation, magnetic separation, gravity separation and the like, and waste gas pollutants generated in the process are mainly various kinds of dust. The waste gas treated by the treatment method of the invention is generated in each process, and the specific treatment method comprises the following steps:
waste gas generated in the disassembling and shelling process is subjected to two-stage alkali liquor spraying, fine filtration and dehumidification, UV photolysis and active carbon adsorption treatment in sequence;
the waste gas generated in the evaporation drying process is sequentially treated in a lime adsorption, TO direct combustion or RTO combustion mode;
and the dust generated in the crushing and sorting process is removed in a bag dust removal and electrostatic dust removal mode in sequence.
Carry out the segmentation to the waste gas kind difference that each process produced, because fluorine content is less in this process waste gas in disassembling the shelling process, spray through alkali lye, fluorine in the waste gas gets into in the waste water, can reduce the change frequency that sprays waste water by a wide margin, and simultaneously, second level alkali lye sprays in the addition medicament and has added sodium carbonate, but reaction production carbon dioxide gas, thereby dilute the total hydrocarbon concentration of non-methane in the waste gas, and UV photodissociation has better treatment effect to low concentration organic waste gas, pass through active carbon adsorption at last again, discharge to reach standard. In the evaporation drying process, because the concentration of non-methane total hydrocarbon and fluorine content in the waste gas is high, and the temperature of the waste gas is also relatively high, the self heat of the waste gas is utilized, and the fluoride is removed by the absorption of lime, so that the purity of the obtained calcium fluoride is high, and the calcium fluoride has certain economical efficiency. In the crushing and sorting process, the processing efficiency of dust particles of the ternary lithium battery is more important for the fact that the positive electrode material contains heavy metal elements such as nickel and cobalt. By utilizing the double-pipe bag dust removal and electrostatic dust removal, dust is effectively collected while standard discharge is achieved, the metal recovery rate can be improved, and the economic benefit is increased.
Furthermore, waste gas generated in the disassembling and shelling process is low-concentration organic waste gas and fluorine-containing compounds, waste gas generated in the evaporation drying process is high-concentration organic waste gas and fluorine-containing compounds, and waste gas generated in the crushing and sorting process is mainly various types of dust.
Further, in the two-stage alkali liquor spraying, the alkali liquor adopted in the first stage of spraying is a mixed solution of 10-15% by mass of sodium hydroxide and 5-10% by mass of calcium hydroxide, and fluorine-containing compounds in waste gas react with the alkali liquor to generate sodium fluoride and calcium fluoride which enter the solution; the alkali liquor adopted by the second stage spraying is a mixed solution of 5-10% of sodium hydroxide and 10-15% of sodium carbonate, and the concentration of non-methane total hydrocarbons in the waste gas is diluted by carbon dioxide gas generated by sodium carbonate reaction through the second stage spraying.
Furthermore, the filter felt for fine filtration and dehumidification is synthetic fiber, and the synthetic fiber can separate particles with the diameter larger than 5 mu m.
Further, in some exemplary embodiments of the present invention, the UV photolysis is performed by using 50-100 UV-C UV lamps with a power of 100 and 250W/W.
Further, the TO direct-fired flame temperature is controlled at 700-900 ℃;
in the RTO combustion, the inlet temperature of the waste gas is 200 ℃ and the oxidation temperature is 800 ℃ and 750 ℃.
Further, in the evaporation drying process, the concentration of organic waste gas and fluorine-containing compounds in the waste gas and the temperature of the waste gas are both higher, and the fluoride is removed by lime adsorption by utilizing the self heat of the waste gas, so that the purity of the obtained calcium fluoride is higher, and the calcium fluoride has certain economical efficiency. The waste gas absorbed by lime is combusted through TO direct combustion or RTO combustion TO oxidize and decompose the organic waste gas into water and carbon dioxide.
Furthermore, the cloth bag dust removal relies on the woven fabric pores to filter dust, and the pores of the woven fabric can be adjusted according to the exhaust gas condition in actual treatment, so that the cloth bag dust removal is not particularly limited; the removal of the very fine dust is performed by a high voltage electrostatic field, preferably, in some exemplary embodiments of the present invention, the voltage of the high voltage electrostatic field is controlled at 60-70 KV.
The technical solution of the present invention will be more clearly and completely described below with reference to specific embodiments.
Example 1
(1) Taking a square waste lithium ion power battery with the model number of 20100140 as an example, the disassembling and shelling process is carried out in a sealed negative pressure state.
The waste gas generated in the process of disassembling and shelling is sprayed by two stages of alkali liquor, and the method comprises the following specific steps: adding a medicament into the first-stage alkali liquor spraying, wherein the medicament is an alkali solution prepared by mixing 15 mass percent of sodium hydroxide and 5 mass percent of calcium hydroxide, and part of fluorine-containing compounds in waste gas react with the alkali liquor to generate sodium fluoride and calcium fluoride which enter the solution; adding a medicament into the secondary alkali liquor spraying, wherein the medicament is an alkali solution prepared by mixing 10% by mass of sodium hydroxide and 10% by mass of sodium carbonate, the residual fluorine-containing compounds in the waste gas react with the alkali liquor to generate sodium fluoride which enters the solution, and the generated carbon dioxide can dilute the concentration of the non-methane total hydrocarbons in the waste gas.
The waste gas sprayed by the alkali liquor is subjected to fine filtration, dehumidification and filtration, spray water drops with the diameter larger than 5 mu m are filtered, the waste gas is subjected to photolysis catalysis through 50 or 250W/C ultraviolet lamp tubes, so that the interior of organic gas in the waste gas is cracked, organic matters in the waste gas are removed, finally, the residual trace pollutants in the waste gas are adsorbed by activated carbon, and the up-to-standard emission of the waste gas in the step of disassembling and shelling is finally realized.
(2) Evaporating and drying the disassembled and shelled battery, wherein the evaporating and drying process is carried out under the protection of nitrogen, and the air volume is controlled at 500m3Heating to 350 ℃ to dry the electrolyte, and pyrolyzing part of organic matters.
The waste gas produced in the working procedure is firstly added with slaked lime by adopting a first section of reagent, the second section of reagent is added with two-section adsorption of quicklime, fluorine-containing waste gas with heat reacts with the slaked lime reagent to obtain calcium fluoride and water vapor, and the water vapor enters the quicklime section along with the waste gas to slake the quicklime and continuously react with residual fluoride in the waste gas to generate calcium fluoride.
The waste gas after the lime adsorption defluorination treatment is subjected to harmless combustion treatment by RTO, the inlet temperature of the waste gas is controlled to be 200 ℃, the oxidation temperature is controlled to be 800 ℃, non-methane total hydrocarbon in the waste gas can be oxidized and decomposed into water and carbon dioxide, and the up-to-standard emission of the waste gas generated in the evaporation drying process is realized.
(3) And (3) crushing and sorting the evaporated and dried batteries, wherein the crushing and sorting process is carried out by adopting modes of air separation, magnetic separation, gravity separation and the like, and sealing and automatic operation are adopted.
Aiming at various kinds of dust generated in the process, the dust is firstly filtered and removed in a pulse bag dust collector by means of woven fabric pores; and the residual extremely-small dust is further effectively collected while the waste gas is discharged up to the standard under the action of a high-voltage electrostatic field of 70 KV.
Example 2
(1) Taking a 32131 cylindrical waste lithium ion power battery as an example, the dismantling and shelling process is carried out in a sealed negative pressure state.
The waste gas generated in the process of disassembling and shelling is sprayed by two stages of alkali liquor, and the method comprises the following specific steps: adding a medicament into the first-stage alkali liquor spraying, wherein the medicament is an alkali solution prepared by mixing 10% by mass of sodium hydroxide and 10% by mass of calcium hydroxide, and part of fluorine-containing compounds in waste gas react with the alkali liquor to generate sodium fluoride and calcium fluoride which enter the solution; adding a medicament into the secondary alkali liquor spraying, wherein the medicament is an alkali solution prepared by mixing 5 mass percent of sodium hydroxide and 15 mass percent of sodium carbonate, the residual fluorine-containing compounds in the waste gas react with the alkali liquor to generate sodium fluoride which enters the solution, and the generated carbon dioxide dilutes the content of non-methane total hydrocarbons in the waste gas.
After the sprayed waste gas is subjected to fine filtration, dehumidification and filtration, spray water drops with the diameter larger than 5 mu m are filtered, photolysis catalysis is performed through 100 UV-C ultraviolet lamp tubes and 100W/C ultraviolet lamp tubes, so that the interior of organic gas in the waste gas is cracked, organic matters in the waste gas are removed, finally, the residual trace pollutants in the waste gas are adsorbed through activated carbon adsorption, and finally, the up-to-standard emission of the waste gas generated in the step of disassembling and shelling is realized.
(2) The evaporation drying process is carried out under the protection of nitrogen, and the air quantity is controlledAt 1000m3Heating to 250 ℃ for h, drying the electrolyte, and carrying out pyrolysis reaction on part of organic waste gas.
The waste gas that this process produced adopts first section medicament to add slaked lime, and the two segmentation of quick lime of second section medicament addition are adsorbed, and fluorine-containing waste gas is from taking the heat, and the reaction obtains calcium fluoride and vapor with medicament slaked lime, and vapor gets into quick lime section along with waste gas, makes quick lime slake to continue to react with surplus fluoride in the waste gas, generate calcium fluoride.
The waste gas after defluorination treatment is directly combusted through TO with the flame temperature of a combustor of 900 ℃ TO be subjected TO harmless combustion treatment, and non-methane total hydrocarbon in the waste gas can be oxidized and decomposed into water and carbon dioxide, so that the standard emission is realized.
(3) The crushing and sorting process needs to be carried out in modes of air separation, magnetic separation, gravity separation and the like, and sealing and automatic operation are adopted.
Various kinds of dust generated in the working procedure are filtered and removed in a pulse bag dust collector by means of woven fabric pores; extremely tiny dust is removed under the action of a high-voltage electrostatic field of 70KV, and the dust is effectively collected while standard-reaching discharge is realized.
By the waste gas treatment method, the secondary pollution can be greatly reduced aiming at the goal of each procedure in the recovery process, the environment-friendly operation cost is reduced, the valuable substance collection and pollutant purification in the waste gas are improved, and finally the harmless emission reaching the standard is realized.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A waste gas treatment method is characterized in that the waste gas is generated in the waste lithium ion power battery recovery process, and the waste lithium ion power battery recovery process sequentially comprises the steps of dismantling and shelling, evaporation drying and crushing separation, and the waste gas treatment method comprises the following steps:
waste gas generated in the disassembling and shelling process is subjected to two-stage alkali liquor spraying, fine filtration and dehumidification, UV photolysis and active carbon adsorption treatment in sequence;
the waste gas generated in the evaporation drying process is sequentially treated in a lime adsorption, TO direct combustion or RTO combustion mode;
and the dust generated in the crushing and sorting process is removed in a bag dust removal and electrostatic dust removal mode in sequence.
2. The exhaust gas treatment method according to claim 1, wherein the exhaust gas generated in the dismantling and shelling process is low-concentration organic exhaust gas and fluorine-containing compounds, the exhaust gas generated in the evaporation drying process is high-concentration organic exhaust gas and fluorine-containing compounds, and the exhaust gas generated in the crushing and sorting process is various types of dust.
3. The waste gas treatment method according to claim 1, wherein in the two-stage alkali liquor spraying, the alkali liquor adopted in the first stage of spraying is a mixed solution of 10-15% by mass of sodium hydroxide and 5-10% by mass of calcium hydroxide; the alkali liquor adopted by the second stage spraying is a mixed solution of 5-10% of sodium hydroxide and 10-15% of sodium carbonate.
4. The method of claim 1, wherein the filter mat for fine filtration and dehumidification is a synthetic fiber capable of separating particles having a diameter of > 5 μm.
5. The method as claimed in claim 1, wherein the UV photolysis is performed by using 50-100 UV-C UV lamps with a power of 100-250W/W.
6. The exhaust gas treatment method as claimed in claim 1, wherein the flame temperature of the TO direct combustion is controlled at 700-900 ℃;
in the RTO combustion, the inlet temperature of the waste gas is 200 ℃ and the oxidation temperature is 800 ℃ and 750 ℃.
7. The exhaust gas treatment method according to claim 1, wherein the lime adsorption is two-stage adsorption, and the two-stage adsorption includes adsorption with slaked lime in the first stage and adsorption with quick lime in the second stage.
8. The exhaust gas treatment method according to claim 1, wherein the bag-type dust removal relies on fabric pores to filter dust; the electrostatic dust collection realizes the removal of extremely tiny dust through a high-voltage electrostatic field.
9. The exhaust gas treatment method according to claim 8, wherein the voltage of the high-voltage electrostatic field is 60 to 70 KV.
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