CN111151094A - Regeneration and purification method for organic polluted waste gas - Google Patents
Regeneration and purification method for organic polluted waste gas Download PDFInfo
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- CN111151094A CN111151094A CN201911424982.6A CN201911424982A CN111151094A CN 111151094 A CN111151094 A CN 111151094A CN 201911424982 A CN201911424982 A CN 201911424982A CN 111151094 A CN111151094 A CN 111151094A
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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
- 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
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- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/60—Combinations of devices covered by groups B01D46/00 and B01D47/00
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- 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
- B01D53/86—Catalytic processes
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
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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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- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
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Abstract
The invention discloses a method for regenerating and purifying organic polluted waste gas, which comprises the following steps: s1: collecting waste gas; s2: pre-treating; s3: adsorbing by activated carbon; s4: discharging clean gas; s5: desorbing and regenerating the activated carbon; s6: catalytic combustion; s7: completing desorption; s8: the hot gas is discharged with cooling, and step S1 is repeated; the invention adopts the mode of activated carbon adsorption concentration and catalytic combustion purification treatment, firstly uses activated carbon to adsorb the organic waste gas, stops adsorption when the organic waste gas is saturated, then uses hot air flow to desorb the organic matters from the activated carbon to regenerate the activated carbon, and the organic waste gas can maintain spontaneous combustion in a catalytic bed without external heating. A part of the tail gas after combustion is discharged into the atmosphere, and most of the tail gas is sent to an adsorption bed for activated carbon regeneration, and the regenerated tail gas can enter the next adsorption; the method is safe, reliable and high in treatment efficiency, and meanwhile, secondary pollution cannot be generated, so that the energy conservation, safety and environmental protection are really realized.
Description
Technical Field
The invention relates to the field of waste gas purification, in particular to a regeneration and purification method for organic polluted waste gas.
Background
Organic waste gas pollutants are various in types and different in characteristics, so correspondingly adopted treatment methods are different, and the common treatment methods are as follows: condensation, absorption, adsorption, biological, catalytic oxidation, and the like; in recent years, new process technologies have been developed abroad: biological methods, low-temperature plasma methods, etc., each process will be briefly described below.
(1) Condensation method
The waste gas is directly introduced into a condenser for condensation, and valuable organic matters can be recovered by separating condensate. The condensation method is adopted, which requires high concentration of organic matters in the waste gas, generally the concentration of the organic matters reaches tens of thousands or even hundreds of thousands ppm, and the method is not applicable to low-concentration organic waste gas.
(2) Absorption method
The absorption method can be divided into chemical absorption and physical absorption, and most organic waste gases are not suitable for chemical absorption. Physical absorption requires that the absorbent has higher affinity with the absorption components and low volatility, and the absorption liquid is reused after being saturated and resolved or rectified. The method is suitable for waste gas with medium and high concentration, but the selection of a cheap and efficient low-volatility absorption liquid is difficult, and meanwhile, the problem of secondary pollution is difficult to solve and the purification effect is not ideal.
(3) Adsorption process
The organic waste gas can reach over 90-95% purifying rate through the adsorption of active carbon, and the equipment is simple and the investment is small. The method can regenerate the active carbon with saturated adsorption by adopting water vapor and the like, but has quite high operation cost and is suitable for medium and high concentration VOCs with recovery value.
(4) Biological method
The method is developed based on mature biological sewage treatment technology, has the characteristics of low energy consumption and low operation cost, and has certain scale application abroad. The method has the disadvantages that the pollutants need to have enough residence time in the mass transfer and digestion processes, so that the occupied area of the equipment is increased, and meanwhile, the control of the whole treatment system during the stop and start is increased because the microorganisms have certain impact load resistance limit values. The method is applied to the treatment of waste gas of domestic sewage stations in a small amount at present, and the application to the treatment of industrial waste gas is very little.
(5) High temperature oxidation process
The method is characterized in that mixed gas is heated to 680 ℃ or above by utilizing heat emitted by combustion of natural gas or fuel oil, and the mixed gas is retained for a certain time (0.5-1 second) to decompose combustible harmful substances into harmless substances at high temperature. The method has the characteristics that: the method has the advantages of simple process and high removal rate, can achieve a heat recovery rate of 90-95% by recovering heat through the catalytic material, is low in operation cost, and particularly has a good treatment effect on some complex components.
For organic waste gas VOCs generated in the paint process, main pollutants are dimethylbenzene and the like, and belong to typical large-gas-quantity and low-concentration waste gas, and the purification effect and the economical efficiency cannot be ensured simultaneously by adopting the method
Disclosure of Invention
The invention aims to: in order to solve the problem that the purification effect and the economy can not be ensured simultaneously when the organic waste gas VOCs generated in the paint treatment process is treated by the existing organic waste gas purification process, the method for regenerating and purifying the organic polluted waste gas is provided.
The technical scheme of the invention is as follows:
a regeneration and purification method of organic polluted waste gas comprises the following steps:
s1: collecting waste gas, namely collecting the waste gas containing a large amount of organic pollutants;
s2: pretreating, namely pretreating the collected waste gas to remove dust impurities in the waste gas and ensure that the particulate matters in the waste gas are less than 5mg/m 3;
s3: performing activated carbon adsorption, namely introducing the pretreated waste gas into an activated carbon adsorption bed filled with honeycomb activated carbon for activated carbon adsorption;
s4: and (4) discharging the clean gas, discharging the clean gas after adsorption is finished, and stopping adsorption when the activated carbon reaches a saturated state.
S5: the active carbon desorption regeneration, start heating device, the heat that produces heats gas, opens active carbon desorption circulation passageway, lets in the active carbon adsorption bed with steam, when the steam temperature reaches the boiling point of organic matter, the organic matter volatilizees from the active carbon.
S6: and (4) catalytic combustion, namely introducing the volatilized organic matters into a catalytic decomposition chamber to perform catalytic combustion decomposition into water and carbon dioxide.
S7: the desorption is accomplished, closes heating device, maintains the spontaneous combustion in the catalytic combustion chamber through the organic matter that volatilizees, produces the heat, and heating gas lets in hot gas in the active carbon adsorption bed, until the organic matter is totally from the inside separation of active carbon, the organic matter burning is totally done away.
S8: the hot air is cooled and discharged, and after the hot air remaining after the burning of the organic matter is exhausted is cooled, the air is discharged, and step S1 is repeated.
In the above solution, the step S2 is specifically,
s21: spraying and washing, namely introducing the collected waste gas into a spraying and washing tower to remove dust impurities in the waste gas;
s22: primary purification treatment, namely performing primary purification treatment on the waste gas by adopting UV photo-oxygen catalysis equipment;
s23: dry filtering, namely filtering the waste gas by using a dry filter to ensure that the particulate matters in the waste gas are less than 5mg/m 3;
in the above scheme, the spray washing tower in step S22 adopts a square cyclone spray tower.
In the above scheme, the reaction formula of the catalytic combustion in step S6 is as follows:
in the scheme, the temperature of the catalytic combustion in the step S6 is 250-320 ℃.
In conclusion, the beneficial effects of the invention are as follows:
according to the invention, through a mode of activated carbon adsorption concentration and catalytic combustion purification treatment, organic waste gas is firstly adsorbed by activated carbon, adsorption is stopped when the organic waste gas is saturated, and then organic matters are desorbed from the activated carbon by hot air flow to regenerate the activated carbon; the desorbed organic matter is concentrated (the concentration is improved by dozens of times compared with the original concentration) and is sent to a catalytic combustion chamber to be catalytically combusted into carbon dioxide and water vapor to be discharged. When the concentration of the organic waste gas reaches above 2000PPm, the organic waste gas can maintain spontaneous combustion in the catalyst bed without external heating. And a part of the tail gas after combustion is discharged into the atmosphere, and most of the tail gas is sent to an adsorption bed for regeneration of the active carbon. Thus, the heat energy required by combustion and adsorption can be met, and the purpose of energy conservation is achieved. The regenerated can get into next absorption, and is safe, reliable, the treatment effeciency is high, simultaneously, can not produce secondary pollution, adopted honeycomb active carbon life 8000h, use cost is low, the maintenance cost low pass through the preliminary treatment mode that adopts spray column + primary effect to filter the dewatering, has got rid of the dirt in the waste gas, guarantees that particulate matter is less than 5mg/m3 in the waste gas, has further improved honeycomb active carbon's life, has done real energy-conservation, safety, environmental protection.
Drawings
The invention will now be described by way of example and with reference to the accompanying drawings in which:
FIG. 1 is a process flow diagram of the present invention;
Detailed Description
The present invention will be described in further detail with reference to specific examples for better carrying out the invention, but the embodiments of the present invention are not limited thereto.
As shown in fig. 1, a method for regenerating and purifying organic pollutant waste gas comprises the following steps:
s1: collecting waste gas, namely collecting the waste gas containing a large amount of organic pollutants;
s2: pretreating, namely pretreating the collected waste gas to remove dust impurities in the waste gas and ensure that the particulate matters in the waste gas are less than 5mg/m 3;
s3: performing activated carbon adsorption, namely introducing the pretreated waste gas into an activated carbon adsorption bed filled with honeycomb activated carbon for activated carbon adsorption;
s4: and (4) discharging the clean gas, discharging the clean gas after adsorption is finished, and stopping adsorption when the activated carbon reaches a saturated state.
S5: the active carbon desorption regeneration, start heating device, the heat that produces heats gas, opens active carbon desorption circulation passageway, lets in the active carbon adsorption bed with steam, when the steam temperature reaches the boiling point of organic matter, the organic matter volatilizees from the active carbon.
S6: and (4) catalytic combustion, namely introducing the volatilized organic matters into a catalytic decomposition chamber to perform catalytic combustion decomposition into water and carbon dioxide.
S7: the desorption is accomplished, closes heating device, maintains the spontaneous combustion in the catalytic combustion chamber through the organic matter that volatilizees, produces the heat, and heating gas lets in hot gas in the active carbon adsorption bed, until the organic matter is totally from the inside separation of active carbon, the organic matter burning is totally done away.
S8: the hot air is cooled and discharged, and after the hot air remaining after the burning of the organic matter is exhausted is cooled, the air is discharged, and step S1 is repeated.
Preferably, in step S2, specifically,
s21: spraying and washing, namely introducing the collected waste gas into a spraying and washing tower to remove dust impurities in the waste gas;
s22: primary purification treatment, namely performing primary purification treatment on the waste gas by adopting UV photo-oxygen catalysis equipment;
s23: dry filtering, namely filtering the waste gas by using a dry filter to ensure that the particulate matters in the waste gas are less than 5mg/m 3;
preferably, the spray washing tower in the step S22 adopts a square cyclone spray tower.
Preferably, the reaction formula of the catalytic combustion in step S6 is as follows:
preferably, the temperature of the catalytic combustion in the step S6 is 250-320 ℃.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. The method for regenerating and purifying the organic polluted waste gas is characterized by comprising the following steps of:
s1: collecting waste gas, namely collecting the waste gas containing a large amount of organic pollutants;
s2: pretreating, namely pretreating the collected waste gas to remove dust impurities in the waste gas and ensure that the particulate matters in the waste gas are less than 5mg/m 3;
s3: performing activated carbon adsorption, namely introducing the pretreated waste gas into an activated carbon adsorption bed filled with honeycomb activated carbon for activated carbon adsorption;
s4: and (4) discharging the clean gas, discharging the clean gas after adsorption is finished, and stopping adsorption when the activated carbon reaches a saturated state.
S5: the active carbon desorption regeneration, start heating device, the heat that produces heats gas, opens active carbon desorption circulation passageway, lets in the active carbon adsorption bed with steam, when the steam temperature reaches the boiling point of organic matter, the organic matter volatilizees from the active carbon.
S6: and (4) catalytic combustion, namely introducing the volatilized organic matters into a catalytic decomposition chamber to perform catalytic combustion decomposition into water and carbon dioxide.
S7: the desorption is accomplished, closes heating device, maintains the spontaneous combustion in the catalytic combustion chamber through the organic matter that volatilizees, produces the heat, and heating gas lets in hot gas in the active carbon adsorption bed, until the organic matter is totally from the inside separation of active carbon, the organic matter burning is totally done away.
S8: the hot air is cooled and discharged, and after the hot air remaining after the burning of the organic matter is exhausted is cooled, the air is discharged, and step S1 is repeated.
2. The method according to claim 1, wherein the step S2 is specifically,
s21: spraying and washing, namely introducing the collected waste gas into a spraying and washing tower to remove dust impurities in the waste gas;
s22: primary purification treatment, namely performing primary purification treatment on the waste gas by adopting UV photo-oxygen catalysis equipment;
s23: and (3) dry filtering, namely filtering the waste gas by using a dry filter to ensure that the particulate matters in the waste gas are less than 5mg/m 3.
3. The method according to claim 1, wherein the spray scrubber tower in step S22 is a square cyclone spray tower.
4. The method according to claim 1, wherein the catalytic combustion in step S6 has the following reaction formula:
5. the method as claimed in claim 1, wherein the temperature of the catalytic combustion in step S6 is 250-320 ℃.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112892168A (en) * | 2021-01-29 | 2021-06-04 | 安徽合力股份有限公司合肥铸锻厂 | Waste gas purification treatment device for lost foam casting |
| CN113440978A (en) * | 2021-07-08 | 2021-09-28 | 山东红石环保科技有限公司 | Industrial waste gas treatment device and method |
| CN113813940A (en) * | 2021-09-29 | 2021-12-21 | 江苏科仕达实验室环保科技有限公司 | Saturated activated carbon activation regeneration treatment process and control method |
| CN114405219A (en) * | 2022-02-21 | 2022-04-29 | 南昌工程学院 | Atmospheric pollutant treatment method based on semi-supervised learning |
| CN114588741A (en) * | 2022-03-14 | 2022-06-07 | 四川金尚环保科技有限公司 | Waste gas treatment system for biodiesel production from illegal cooking oil |
| CN114669176A (en) * | 2022-04-19 | 2022-06-28 | 成都艾侃智能设备有限公司 | Method for treating waste gas by calcium circulation decarburization |
| CN116803465A (en) * | 2023-06-29 | 2023-09-26 | 广州华科环保工程有限公司 | Method for centralized collection and treatment of organic waste gas in printing industry |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112892168A (en) * | 2021-01-29 | 2021-06-04 | 安徽合力股份有限公司合肥铸锻厂 | Waste gas purification treatment device for lost foam casting |
| CN113440978A (en) * | 2021-07-08 | 2021-09-28 | 山东红石环保科技有限公司 | Industrial waste gas treatment device and method |
| CN113813940A (en) * | 2021-09-29 | 2021-12-21 | 江苏科仕达实验室环保科技有限公司 | Saturated activated carbon activation regeneration treatment process and control method |
| CN114405219A (en) * | 2022-02-21 | 2022-04-29 | 南昌工程学院 | Atmospheric pollutant treatment method based on semi-supervised learning |
| CN114588741A (en) * | 2022-03-14 | 2022-06-07 | 四川金尚环保科技有限公司 | Waste gas treatment system for biodiesel production from illegal cooking oil |
| CN114669176A (en) * | 2022-04-19 | 2022-06-28 | 成都艾侃智能设备有限公司 | Method for treating waste gas by calcium circulation decarburization |
| CN116803465A (en) * | 2023-06-29 | 2023-09-26 | 广州华科环保工程有限公司 | Method for centralized collection and treatment of organic waste gas in printing industry |
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Application publication date: 20200515 |