CN113521927A - Method for treating xylene waste gas - Google Patents
Method for treating xylene waste gas Download PDFInfo
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- CN113521927A CN113521927A CN202110925369.3A CN202110925369A CN113521927A CN 113521927 A CN113521927 A CN 113521927A CN 202110925369 A CN202110925369 A CN 202110925369A CN 113521927 A CN113521927 A CN 113521927A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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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
- B01D53/02—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
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/343—Heat recovery
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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
- B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/702—Hydrocarbons
- B01D2257/7027—Aromatic hydrocarbons
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- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
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- Environmental & Geological Engineering (AREA)
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- Treating Waste Gases (AREA)
Abstract
A method for treating xylene waste gas comprises the following steps: firstly, spraying a compound through a purification tower, physically separating particles and capsules, and eliminating stink; secondly, the waste heat enters the heat exchanger again through the return pipe, absorbs heat energy and utilizes the waste heat of the heat exchanger to perform secondary deodorization; thirdly, water is used for cooling the gas, and the gas after water cooling enters a purification tower; fourthly, the sprayer carries out water atomization separation on the waste gas, and a gas separation method is adopted to eliminate smoke generated in the waste gas; fifthly, the ultraviolet photolysis purification processor and the activated carbon adsorption box are used for deodorization again. The invention has the advantages of high treatment efficiency, small occupied area, simple structure, energy saving, environmental protection and no secondary pollution.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to a method for treating xylene waste gas.
Background
With the rapid development of industrial economy, a large amount of harmful gases are generated in the production engineering of leather production, printing factories, automobile spray paint, various coating additives, various adhesives, waterproof materials and other chemical industries, and the waste gas contains dimethylbenzene harmful gases with higher concentration. The xylene component belongs to medium toxicity and has carcinogenicity, if a human body inhales high-concentration xylene in a short time, central nervous anesthesia can be caused, and mild people feel dizzy, aversive, chest distress and hypodynamia, and severe people can be unconscious and even die due to exhaustion of respiratory circulation, so that the human health is seriously threatened, and the ecological environment is seriously damaged. Therefore, the treatment of the harmful gas of xylene generated by various chemical industries is urgent. At present, the processing technology of p-xylene mainly has the problems of high cost, low processing efficiency, easy secondary pollution and large occupied area of instruments.
Disclosure of Invention
The invention aims to solve the problems and provides a method for treating xylene waste gas, which has the advantages of stable performance, simple operation, safety, reliability, no secondary pollution, small equipment floor area, large airflow circulation, simple structure, high waste gas treatment rate and low cost.
The technical scheme of the invention is realized as follows: a method for treating xylene waste gas is characterized in that: the method comprises the following steps:
step 1: introducing xylene waste gas to be treated into a purification tower through a first gas inlet at the lower part of the first purification tower, continuously spraying a compound downwards by a first sprayer at the upper part in the first purification tower through a packing layer at the lower part, separating particles and capsules in the waste gas, and sinking into the waste water at the bottom of the first purification tower; the absorption liquid is sprayed from a first sprayer at the upper part of the tower after being pressurized by a water pump from the tower bottom, and finally flows back to the tower bottom for recycling, and the treated waste gas is sent out from a first gas outlet at the top of a first purification tower;
step 2: the waste gas sent out from the first gas outlet is pressurized by a compressor, then is sent to a heated area through a first return pipe on the periphery of a first heat exchanger, then is sent to a second heat exchanger through the heated area, and the gas passing through the second heat exchanger passes through the heated area through a second return pipe, then is sent to the periphery of the second heat exchanger through a third return pipe after passing through the heated area, and then is sent out through the first heat exchanger after passing through the periphery of the second heat exchanger;
and step 3: waste gas sent out by the first heat exchanger is sent into a third heat exchanger, water at the lower part of the second purification tower enters a water flow pipeline flowing around the periphery of the third heat exchanger through a water inlet, then flows back into the second purification tower through a water outlet, and the water-cooled waste gas is sent into the second purification tower through a third air outlet;
and 4, step 4: purifying the fed waste gas in the second purification tower through the second sprayer and the third sprayer on the upper part again, and dissolving smoke generated in the waste gas in water by adopting a gas separation method;
and 5: and the gas purified by the second purification tower is sent into the uv photolysis purifier and the activated carbon adsorption tank from the fourth gas outlet at the top of the second purification tower and then is discharged into the atmosphere from the fifth gas outlet.
Further, the temperature of the first heat exchanger is 200 ℃.
Furthermore, the heated area is made of extrusion-molded honeycomb ceramics made of fused quartz ceramic materials.
Further, the temperature of the heated area is automatically controlled to be 800-900 ℃.
Further, the surface temperature of the second heat exchanger is set at 560 ℃.
Furthermore, the activated carbon adsorption box adopts honeycomb activated carbon, and the activated carbon supporting plate adopts a customized high-strength galvanized steel grating.
The invention has the beneficial effects that: low cost, high treatment efficiency, small occupied area, simple structure, energy conservation, environmental protection and no secondary pollution by-product.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1. a first air inlet; 2. a first sprayer; 3. a first air outlet; 4. a compressor; 5. a second air inlet; 6. a first return pipe; 7. a heated zone; 8. a second heat exchanger; 9. a second return pipe; 10. a third return conduit; 11. a third air inlet; 12. a second air outlet; 13. a first heat exchanger; 14. a fourth air inlet; 15. a third heat exchanger; 16. a water inlet; 17. a third air outlet; 18. a water outlet; 19. a second sprayer; 20. a third sprayer; 21. a fourth air outlet; 22. a uv photolysis purifier; 23. an activated carbon adsorption tank; 24. and a fifth air outlet.
Detailed Description
As shown in FIG. 1, the equipment adopted by the method for treating the xylene waste gas comprises two purification towers, a first heat exchanger 13, a heat insulation layer 7, a second heat exchanger 8, a third heat exchanger 15, a uv photolysis purifier 22 and an activated carbon adsorption tank 23.
The invention relates to a method for treating xylene waste gas, which comprises the following steps:
step 1: xylene waste gas to be treated is introduced into the purification tower through a first gas inlet 1 at the lower part of the first purification tower, a first sprayer 2 at the upper part in the first purification tower continuously sprays compounds downwards through a packing layer at the lower part, particles and capsules in the waste gas are separated out, and the waste gas sinks into waste water at the bottom of the first purification tower. The absorption liquid is sprayed from a first sprayer 2 at the upper part of the tower after being pressurized by a water pump from the tower bottom, and finally flows back to the tower bottom for recycling, and the waste gas after the first-step treatment is sent out from a first gas outlet 3 at the top of the first purification tower.
Step 2: the waste gas sent from the first gas outlet 3 is pressurized by the compressor 4, then is sent to the heated area 7 through the first return pipe 6 at the periphery of the first heat exchanger 13, then is sent to the second heat exchanger 8 through the heated area 7, the gas treated by the second heat exchanger 8 passes through the heated area 7 through the second return pipe 9, then is sent to the periphery of the second heat exchanger 8 through the third return pipe 10 after passing through the heated area 7, and is sent out after passing through the first heat exchanger 13 after passing through the periphery of the second heat exchanger 8.
The temperature of the first heat exchanger 13 is 200 ℃, and the hot gas is stored by the heat accumulator, so that the organic gas can be rapidly decomposed. The waste gas passes through the periphery of the heat exchanger to absorb the heat of the heat exchanger, improve the heat energy of the gas and separate smaller particles in the waste gas. A large amount of heat storage energy is utilized to decompose and treat organic waste gas, the waste gas is continuously decomposed by continuously storing heat, and a large amount of electricity and natural gas are saved. The electromagnetic in the heat exchanger is that the pan body of the metal container is placed in a variable electromagnetic field, when a variable magnetic line of force is cut by the metal container, a large amount of vortex eddy currents are generated on the surface of the metal container, so that the metal container is heated, heat-accumulated waste gas in the metal container is heated and decomposed, and heat energy generated by the eddy currents generates heat radiation in the heat accumulator, so that the waste gas is decomposed or air is heated. The thermal radiation decomposition method treats the organic waste gas containing 'three benzene' and oxidizes the organic pollutants in the waste gas into carbon dioxide and water at a lower temperature. The method is an organic waste gas treatment method without open fire under the catalysis condition, and is suitable for treating high-concentration organic waste gas.
The temperature of the heated area 7 of the high-frequency heating area of the heat exchanger is automatically controlled to be 800-900 ℃, and the electricity consumption for heating is 10-14 ℃ per hour. The heated region 7 is made of an extruded honeycomb ceramic made of fused quartz ceramic material, and the fused quartz has the advantages of inertia, low thermal expansion characteristic and high heat capacity. The fused silica honeycomb ceramic can be used as a catalyst carrier and a substrate. The catalyst is bonded to the surface of the honeycomb ceramic and penetrates into the pores by a secondary impregnation process. The surface temperature of the second heat exchanger 8 is set at 560 ℃, and the waste gas is subjected to thermal separation to further treat harmful substances in the waste gas. In the step, the temperature is automatically controlled, 2w cubic wind volume is processed every hour, 5000 cubic meters are obtained every hour after the air is compressed by a compressor, and 99.9 percent of xylene waste gas with the content of 500 mg/cubic meter to 2000 mg/cubic meter can be decomposed. The treated gas sequentially reaches the heated area and the periphery of the second heat exchanger 8 with the temperature of 560 ℃ through a return pipe, waste heat is absorbed, harmful substances in the waste gas are further treated, and the purpose of reusing heat is achieved. Finally, the treated gas enters a first heat exchanger 13 with the temperature reaching 200 ℃ through an airflow pipe, and harmful substances in the gas are further treated.
And step 3: the waste gas sent out after passing through the first heat exchanger 13 is sent into a third heat exchanger 15, the waste gas is cooled by water, the water at the lower part of the second purifying tower enters a water flow pipeline flowing around the periphery of the third heat exchanger 15 through a water inlet 16 and flows back into the second purifying tower through a water outlet 18, on one hand, the gas in the third heat exchanger 15 is cooled by the flowing water, and on the other hand, the purpose of recycling water resources is achieved. The water-cooled gas is also fed to the second purification tower through the third gas outlet 17.
And 4, step 4: the supplied exhaust gas is purified again by the second and third showers 19 and 20 at the upper part in the second purification tower, and the smoke generated in the exhaust gas is dissolved in water by a gas separation method.
And 5: the gas purified by the second purification tower is sent to the uv photolysis purifier 22 and the activated carbon adsorption tank 23 from the fourth gas outlet 21 at the top and then is discharged to the atmosphere from the fifth gas outlet 24.
The uv photolysis purifier 22 can rapidly remove the harmful gas of xylene and deodorize, and the activated carbon adsorption tank 23 is used for deodorization. Activated carbon adsorption case 23 adopts honeycomb activated carbon, and the resistance is low, and the activated carbon layer board adopts the high strength galvanized steel grating of customization, and structural strength is high, and long service life is convenient for change and dismantle, and the energy consumption in the use only is exhaust fan power, can not increase other expenses.
The flow direction of the waste gas flows out in sequence according to a-b-c in the figure 1, and the water flow direction is d.
The above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and variations, modifications, additions and substitutions which can be made by a person skilled in the art within the spirit of the invention are also within the scope of the invention.
Claims (6)
1. A method for treating xylene waste gas is characterized in that: the method comprises the following steps:
step 1: introducing xylene waste gas to be treated into a purification tower through a first gas inlet (1) at the lower part of the first purification tower, continuously spraying compounds downwards through a packing layer at the lower part by a first sprayer (2) at the upper part in the first purification tower, separating particles and capsules in the waste gas, and sinking into the waste water at the bottom of the first purification tower; the absorption liquid is sprayed from a first sprayer at the upper part of the tower after being pressurized by a water pump from the tower bottom, and finally flows back to the tower bottom for recycling, and the treated waste gas is sent out from a first gas outlet (3) at the top of the first purification tower;
step 2: the waste gas sent out from the first gas outlet (3) is pressurized by a compressor (4), then is sent to a heated area (7) through a first return pipe (6) at the periphery of a first heat exchanger (13), then is sent to a second heat exchanger (8) through the heated area, and the gas passing through the second heat exchanger passes through a second return pipe (9), then passes through the heated area, then is sent to the periphery of the second heat exchanger (8) through a third return pipe (10), and then is sent out after passing through the periphery of the second heat exchanger and then passes through the first heat exchanger;
and step 3: waste gas sent out by the first heat exchanger (13) is sent into a third heat exchanger (15), water at the lower part of the second purification tower enters a water flow pipeline flowing around the periphery of the third heat exchanger through a water inlet (16), then flows back into the second purification tower through a water outlet (18), and the water-cooled waste gas is sent into the second purification tower through a third air outlet (17);
and 4, step 4: the fed waste gas is purified again in the second purification tower through a second sprayer (19) and a third sprayer (20) at the upper part, and smoke generated in the waste gas is dissolved in water by adopting a gas separation method;
and 5: the gas purified by the second purification tower is sent into a uv photolysis purifier (22) and an activated carbon adsorption tank (23) from a fourth gas outlet (21) at the top of the second purification tower and then is discharged into the atmosphere from a fifth gas outlet (24).
2. The method for treating xylene waste gas according to claim 1, characterized in that: the temperature of the first heat exchanger (13) is 200 ℃.
3. The method for treating xylene off-gas according to claim 1 or 2, characterized in that: the heated area (7) is made of extrusion-molded honeycomb ceramics made of fused quartz ceramic materials.
4. The method for treating xylene waste gas according to claim 2, characterized in that: the temperature of the heated area (7) is automatically controlled to be 800-900 ℃.
5. The method for treating xylene waste gas according to claim 4, characterized in that: the surface temperature of the second heat exchanger (8) is set to 560 ℃.
6. The method for treating xylene waste gas according to claim 1, characterized in that: the activated carbon adsorption box (23) adopts honeycomb activated carbon, and the activated carbon supporting plate adopts a customized high-strength galvanized steel grating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110925369.3A CN113521927A (en) | 2021-08-12 | 2021-08-12 | Method for treating xylene waste gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110925369.3A CN113521927A (en) | 2021-08-12 | 2021-08-12 | Method for treating xylene waste gas |
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Application publication date: 20211022 |