CN109499363B - Waste gas purification process for baking finish house - Google Patents
Waste gas purification process for baking finish house Download PDFInfo
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- CN109499363B CN109499363B CN201910030007.0A CN201910030007A CN109499363B CN 109499363 B CN109499363 B CN 109499363B CN 201910030007 A CN201910030007 A CN 201910030007A CN 109499363 B CN109499363 B CN 109499363B
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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
- B01D53/86—Catalytic processes
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0258—Other waste gases from painting equipments or paint drying installations
Abstract
The invention discloses a process for degrading and treating waste gas of a baking finish house by using a heterogeneous catalysis wet hydrogen peroxide oxidation method, which is characterized by comprising the following steps of: waste gas of the baking varnish room enters the heat exchanger through the air inlet pipeline under the action of the booster pump, and is sprayed into reaction liquid of the baking varnish room waste gas treatment device through the nozzle, the waste gas treated by the reaction liquid is further adsorbed by the adsorption layer and is discharged through the air outlet pipeline, and the treatment of the waste gas of the baking varnish room is completed after the process is carried out for 1-1.5 hours. The invention fully utilizes the temperature of the waste gas of the baking finish house and the temperature rise generated after the pressurization of the booster pump, does not need to additionally heat the reaction liquid, simultaneously realizes the harmless treatment of the waste gas of the baking finish house through the heterogeneous catalysis wet hydrogen peroxide oxidation effect, the catalyst in the reaction liquid can be repeatedly used, in addition, the pH value of the reaction liquid in the treatment process does not need to be additionally adjusted, the process flow is simple, the energy consumption and the equipment investment are low, and the technical and economic advantages are obvious.
Description
Technical Field
The patent relates to the field of waste gas treatment, in particular to a waste gas treatment and purification process for a baking finish house.
Background
With the rapid development of industrial economy in China, a large amount of equipment, particularly in the field of automobile production, manufacturing and maintenance, needs to be subjected to paint baking operation, when paint is baked, a large amount of toxic and irritant gases are generated due to high temperature and volatilization of paint, if the air is seriously polluted due to emission of the toxic and irritant gases, the human health is harmed, at present, part of the volatile gases are directly filtered by simple high-temperature cotton and then directly discharged, and the discharged gases still have strong irritant odor; and the other part is removed by adopting a physical method such as simple adsorption filtration and the like, and the method has the defects of low efficiency, incomplete treatment and the like. Therefore, the invention aims to mineralize the gas into water and carbon dioxide by adopting a heterogeneous catalysis wet hydrogen peroxide oxidation method to carry out catalytic oxidation degradation on the gas, so that harmless emission is realized, and the problem of emission of waste gas of a baking finish house is solved. Meanwhile, the method can avoid the defects that the active components are easy to lose, the pH value is limited to 2-4, the pH value needs to be adjusted in the reaction process and the like in the traditional Fenton method.
Disclosure of Invention
The invention aims to: aiming at the problem of waste gas emission treatment of the current paint baking room, a heterogeneous catalysis wet hydrogen peroxide oxidation method is adopted to catalyze, oxidize and degrade the waste gas so as to mineralize the waste gas into water and carbon dioxide, and harmless emission is realized.
In order to achieve the purpose, the invention provides the following technical scheme:
waste gas of the baking varnish house enters a heat exchanger through an air inlet pipeline under the action of a booster pump, then is sprayed into reaction liquid of a waste gas treatment device of the baking varnish house through a nozzle, the waste gas treated by the reaction liquid is further adsorbed by an adsorption layer and then is discharged through an air outlet pipeline, and the waste gas of the baking varnish house is treated after the process is carried out for 1-1.5 hours.
Further, the reaction solution contains a catalyst and H2O2Wherein the catalyst is a Cu-Mn-Ce-O catalyst.
Furthermore, the content of the Cu-Mn-Ce-O catalyst in the reaction liquid is 0.025 to 0.1 percent (mass percentage).
Further, H in the reaction solution2O2The content of the compound is 0.1-0.25 percent (mass percentage).
Further, the pH value of the reaction solution is 1.8-11.8.
Furthermore, the volume of the reaction liquid is 20 to 30 times of the volume of the waste gas of the baking finish house entering the air inlet pipeline every minute.
Furthermore, the pressure of the baking finish house waste gas after the action of the booster pump is 0.125MPa (A) to 0.2MPa (A).
Furthermore, the distance between the nozzle and the bottom of the device is 1/3-1/4 of the vertical distance between the bottom of the device and the liquid level of the reaction liquid.
Further, the gas temperature of the waste gas of the baking finish house after passing through the heat exchanger is 100-150 ℃.
Furthermore, the adsorption layer is an activated carbon fixed bed, and the height of the bed layer is 1/3-1/2 of the vertical distance between the bottom of the device and the liquid level of the reaction liquid.
Furthermore, the molar ratio of Cu to Mn of the Cu-Mn-Ce-O catalyst is 0.5-2.
Furthermore, the molar ratio of (Cu + Mn) to Ce in the Cu-Mn-Ce-O catalyst is 1-3.
Furthermore, the specific surface area of the Cu-Mn-Ce-O catalyst is 3m2/g～40m2/g。
Furthermore, the aperture of the Cu-Mn-Ce-O catalyst is 1 nm-15 nm.
Furthermore, the pore volume of the Cu-Mn-Ce-O catalyst is 2.5cm3/g～10cm3/g。
The beneficial effects of the invention include the following aspects:
1) after the booster pump is used for pumping air, a certain pressure difference is formed between the baking finish house and the outside, so that waste gas in the baking finish house is not discharged any more, and can only enter the waste gas treatment device through the air pumping action of the booster pump, and the waste gas cannot be leaked and discharged.
2) The temperature of waste gas entering the waste gas treatment device of the baking finish house is controlled to be 100-150 ℃ through the external heat exchanger, the reaction liquid is heated to a proper reaction temperature through heat exchange after entering the waste gas treatment device, the temperature of the waste gas of the baking finish house and the temperature rise generated after pressurization of the booster pump are fully utilized, the reaction liquid does not need to be additionally heated, the equipment investment and energy consumption for heating the reaction liquid are saved, and the treatment cost is reduced.
3) After the waste gas enters the reaction liquid, the waste gas is degraded into water and carbon dioxide through heterogeneous catalysis wet-type hydrogen peroxide oxidation, so that harmless treatment is realized. Meanwhile, the invention also arranges an active carbon fixed bed as an adsorption treatment layer to adsorb a few of possible incompletely-reacted waste gas, thereby realizing the complete treatment of the waste gas of the baking finish house.
4) The Cu-Mn-Ce-O catalyst in the reaction liquid can be repeatedly used without replacement, and the cost can be greatly reduced.
5) The reaction solution has high catalytic oxidation degradation capability within the pH value range of 1.8-11.2, avoids the limitation that the pH value of the reaction solution needs to be within the range of 2-4 in the traditional Fenton method, and does not need to be additionally adjusted in the reaction process.
Drawings
FIG. 1 is a schematic view of a waste gas purification process of a baking finish house according to the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in the figure, the waste gas purification process for the baking finish house in the embodiment includes the following steps:
1) waste gas of the baking varnish room enters the heat exchanger through the air inlet pipeline under the action of the booster pump, and is sprayed into reaction liquid of the baking varnish room waste gas treatment device through the nozzle, the waste gas treated by the reaction liquid is further adsorbed by the adsorption layer and is discharged through the air outlet pipeline, and the treatment of the waste gas of the baking varnish room is completed after the process is carried out for 1-1.5 hours.
2) In the step 1), the reaction liquid of the waste gas treatment device of the baking finish house contains a catalyst and H2O2Wherein the catalyst is a Cu-Mn-Ce-O catalyst.
3) In the step 1), the content of the Cu-Mn-Ce-O catalyst in the reaction liquid of the waste gas treatment device of the baking finish house is 0.025 to 0.1 percent (mass percentage).
4) In the step 1), H in the reaction liquid of the waste gas treatment device of the baking finish house2O2The content of the compound is 0.1-0.25 percent (mass percentage).
5) In the step 1), the pH value range of the reaction liquid of the waste gas treatment device of the baking finish house is 1.8-11.8.
6) In the step 1), the volume of the reaction liquid of the waste gas treatment device of the baking finish house is 20-30 times of the volume of the waste gas of the baking finish house entering the air inlet pipeline per minute.
7) In the step 1), the pressure of the baking finish house waste gas after the action of the booster pump is 0.125MPa (A) to 0.2MPa (A).
8) In the step 1), the waste gas of the baking finish house after heat exchange by the heat exchanger is sprayed into the reaction liquid of the waste gas treatment device of the baking finish house through a nozzle, wherein the distance between the nozzle and the bottom of the device is 1/3-1/4 of the vertical distance between the bottom of the device and the liquid level of the reaction liquid.
9) In the step 1), the temperature of the waste gas of the baking finish house pressurized by the booster pump is controlled to be 100-150 ℃ through the heat exchanger.
10) In the step 1), the waste gas of the baking finish house treated by the reaction liquid of the waste gas treatment device of the baking finish house is further adsorbed by an adsorption layer, wherein the adsorption layer is an activated carbon fixed bed, and the height of the bed layer is 1/3-1/2 of the vertical distance between the bottom of the device and the liquid level of the reaction liquid.
11) In the step 1), the molar ratio of Cu to Mn of the Cu-Mn-Ce-O catalyst in the reaction liquid of the waste gas treatment device of the baking finish house is 0.5-2, and the molar ratio of (Cu + Mn) to Ce is 1-3.
12) In the step 1), the specific surface area of the Cu-Mn-Ce-O catalyst in the reaction liquid of the waste gas treatment device of the baking finish house is 3m2/g～40m2G, the aperture is 1 nm-15 nm, and the pore volume is 2.5cm3/g～10cm3/g。
The invention fully utilizes the temperature of the waste gas of the baking finish house and the temperature rise generated after the pressurization of the booster pump, does not need to additionally heat the reaction liquid, saves the equipment investment and the energy consumption for heating the reaction liquid, simultaneously realizes the harmless treatment of the waste gas of the baking finish house through the heterogeneous catalysis wet hydrogen peroxide oxidation effect, can repeatedly use the Cu-Mn-Ce-O catalyst in the reaction liquid, does not need to be replaced, in addition, the pH value of the reaction liquid does not need to be additionally regulated in the treatment process, the process flow is simple, the energy consumption and the equipment investment are lower, and the integral technology and the economic advantage are very obvious.
The first embodiment:
1) waste gas of the baking finish room enters the heat exchanger through the air inlet pipeline under the action of the booster pump, is sprayed into reaction liquid of the waste gas treatment device of the baking finish room through the nozzle, is further adsorbed by the adsorption layer after being treated by the reaction liquid, and is discharged through the air outlet pipeline, and after the process is carried out for 1 hour, the treatment of the waste gas of the baking finish room is completed.
2) In the step 1), the reaction liquid of the waste gas treatment device of the baking finish house contains a catalyst and H2O2An aqueous solution of (a), whichThe medium catalyst is Cu-Mn-Ce-O catalyst.
3) In the step 1), the content of the Cu-Mn-Ce-O catalyst in the reaction liquid of the waste gas treatment device of the baking finish house is 0.025 percent (mass percentage).
4) In the step 1), H in the reaction liquid of the waste gas treatment device of the baking finish house2O2The content thereof is 0.1% (mass percent).
5) In the step 1), the pH value of the reaction liquid of the waste gas treatment device of the baking finish house is 1.8.
6) In the step 1), the volume of the reaction liquid of the waste gas treatment device of the baking finish house is 20 times of the volume of the waste gas of the baking finish house entering the air inlet pipeline per minute.
7) In the step 1), the pressure of the waste gas of the baking finish house after the action of the booster pump is 0.125MPa (A).
8) In the step 1), the waste gas of the baking finish house after heat exchange by the heat exchanger is sprayed into the reaction liquid of the waste gas treatment device of the baking finish house through the nozzle, wherein the distance between the nozzle and the bottom of the device is 1/3 of the vertical distance between the bottom of the device and the liquid level of the reaction liquid.
9) In the step 1), the temperature of the waste gas of the baking finish house pressurized by the booster pump is controlled at 100 ℃ by the heat exchanger.
10) In the step 1), the waste gas of the baking finish house treated by the reaction liquid of the waste gas treatment device of the baking finish house is further adsorbed by an adsorption layer, wherein the adsorption layer is an activated carbon fixed bed, and the height of the bed layer is 1/3 of the vertical distance between the bottom of the device and the liquid level of the reaction liquid.
11) In the step 1), the molar ratio of Cu to Mn of the Cu-Mn-Ce-O catalyst in the reaction liquid of the waste gas treatment device of the baking finish house is 0.5, and the molar ratio of (Cu + Mn) to Ce is 1.
12) In the step 1), the specific surface area of the Cu-Mn-Ce-O catalyst in the reaction liquid of the waste gas treatment device of the baking finish house is 3m2G, pore diameter of 1nm and pore volume of 2.5cm3/g。
The invention fully utilizes the temperature of the waste gas of the baking finish house and the temperature rise generated after the pressurization of the booster pump, does not need to additionally heat the reaction liquid, saves the equipment investment and the energy consumption for heating the reaction liquid, simultaneously realizes the harmless treatment of the waste gas of the baking finish house through the heterogeneous catalysis wet hydrogen peroxide oxidation effect, can repeatedly use the Cu-Mn-Ce-O catalyst in the reaction liquid, and in addition, the invention does not need to additionally adjust the pH value of the reaction liquid, has simple process flow, lower energy consumption and equipment investment, and obvious technical and economic advantages.
Second embodiment:
1) waste gas of the baking varnish room enters the heat exchanger through the air inlet pipeline under the action of the booster pump, is sprayed into reaction liquid of the waste gas treatment device of the baking varnish room through the nozzle, is further adsorbed by the adsorption layer after being treated by the reaction liquid, and is discharged through the air outlet pipeline, and the process is carried out for 1.2 hours, so that the treatment of the waste gas of the baking varnish room is completed.
2) In the step 1), the reaction liquid of the waste gas treatment device of the baking finish house contains a catalyst and H2O2Wherein the catalyst is a Cu-Mn-Ce-O catalyst.
3) In the step 1), the content of the Cu-Mn-Ce-O catalyst in the reaction liquid of the waste gas treatment device of the baking finish house is 0.05 percent (mass percentage).
4) In the step 1), H in the reaction liquid of the waste gas treatment device of the baking finish house2O2The content thereof is 0.15% (mass percentage).
5) In the step 1), the pH value of the reaction liquid of the waste gas treatment device of the baking finish house is 6.8.
6) In the step 1), the volume of the reaction liquid of the waste gas treatment device of the baking finish house is 25 times of the volume of the waste gas of the baking finish house entering the air inlet pipeline per minute.
7) In the step 1), the pressure of the waste gas of the baking finish house after the action of the booster pump is 0.155MPa (A).
8) In the step 1), the waste gas of the baking finish house after heat exchange by the heat exchanger is sprayed into the reaction liquid of the waste gas treatment device of the baking finish house through the nozzle, wherein the distance between the nozzle and the bottom of the device is 7/24 of the vertical distance between the bottom of the device and the liquid level of the reaction liquid.
9) In the step 1), the temperature of the waste gas of the baking finish house pressurized by the booster pump is controlled at 130 ℃ by the heat exchanger.
10) In the step 1), the waste gas of the baking finish house treated by the reaction liquid of the waste gas treatment device of the baking finish house is further adsorbed by an adsorption layer, wherein the adsorption layer is an activated carbon fixed bed, and the height of the bed layer is 5/12 of the vertical distance between the bottom of the device and the liquid level of the reaction liquid.
11) In the step 1), the molar ratio of Cu to Mn of the Cu-Mn-Ce-O catalyst in the reaction liquid of the waste gas treatment device of the baking finish house is 1, and the molar ratio of (Cu + Mn) to Ce is 2.
12) In the step 1), the specific surface area of the Cu-Mn-Ce-O catalyst in the reaction liquid of the waste gas treatment device of the baking finish house is 18m2G, pore diameter of 7nm and pore volume of 5cm3/g。
The invention fully utilizes the temperature of the waste gas of the baking finish house and the temperature rise generated after the pressurization of the booster pump, does not need to additionally heat the reaction liquid, saves the equipment investment and the energy consumption for heating the reaction liquid, simultaneously realizes the harmless treatment of the waste gas of the baking finish house through the heterogeneous catalysis wet hydrogen peroxide oxidation effect, can repeatedly use the Cu-Mn-Ce-O catalyst in the reaction liquid, in addition, the pH value of the reaction liquid does not need to be additionally regulated, the process flow is simple, the energy consumption and the equipment investment are lower, and the technical and economic advantages are obvious.
The third embodiment:
1) waste gas of the baking varnish room enters the heat exchanger through the air inlet pipeline under the action of the booster pump, is sprayed into reaction liquid of the waste gas treatment device of the baking varnish room through the nozzle, is further adsorbed by the adsorption layer after being treated by the reaction liquid, and is discharged through the air outlet pipeline, and after the process is carried out for 1.5 hours, the treatment of the waste gas of the baking varnish room is completed.
2) In the step 1), the reaction liquid of the waste gas treatment device of the baking finish house contains a catalyst and H2O2Wherein the catalyst is a Cu-Mn-Ce-O catalyst.
3) In the step 1), the content of the Cu-Mn-Ce-O catalyst in the reaction liquid of the waste gas treatment device of the baking finish house is 0.1 percent (mass percentage).
4) In the step 1), in the reaction liquid of the waste gas treatment device of the baking finish houseH of (A) to (B)2O2The content thereof was 0.25% (mass%).
5) In the step 1), the pH value of the reaction liquid of the waste gas treatment device of the baking finish house is 11.8.
6) In the step 1), the volume of the reaction liquid of the waste gas treatment device of the baking finish house is 30 times of the volume of the waste gas of the baking finish house entering the air inlet pipeline per minute.
7) In the step 1), the pressure of the waste gas of the baking finish house after the action of the booster pump is 0.2MPa (A).
8) In the step 1), the waste gas of the baking finish house after heat exchange by the heat exchanger is sprayed into the reaction liquid of the waste gas treatment device of the baking finish house through the nozzle, wherein the distance between the nozzle and the bottom of the device is 1/4 of the vertical distance between the bottom of the device and the liquid level of the reaction liquid.
9) In the step 1), the temperature of the waste gas of the baking finish house pressurized by the booster pump is controlled at 150 ℃ through the heat exchanger.
10) In the step 1), the waste gas of the baking finish house treated by the reaction liquid of the waste gas treatment device of the baking finish house is further adsorbed by an adsorption layer, wherein the adsorption layer is an activated carbon fixed bed, and the height of the bed layer is 1/2 of the vertical distance between the bottom of the device and the liquid level of the reaction liquid.
11) In the step 1), the molar ratio of Cu to Mn of the Cu-Mn-Ce-O catalyst in the reaction liquid of the waste gas treatment device of the baking finish house is 2, and the molar ratio of (Cu + Mn) to Ce is 3.
12) In the step 1), the specific surface area of the Cu-Mn-Ce-O catalyst in the reaction liquid of the waste gas treatment device of the baking finish house is 40m2G, pore diameter of 15nm and pore volume of 10cm3/g。
The invention fully utilizes the temperature of the waste gas of the baking finish house and the temperature rise generated after the pressurization of the booster pump, does not need to additionally heat the reaction liquid, saves the equipment investment and the energy consumption for heating the reaction liquid, simultaneously realizes the harmless treatment of the waste gas of the baking finish house through the heterogeneous catalysis wet hydrogen peroxide oxidation effect, and the Cu-Mn-Ce-O catalyst in the reaction liquid can be repeatedly used.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (3)
1. A waste gas purification process of a baking finish house is characterized in that: waste gas of the baking varnish room enters the heat exchanger through the gas inlet pipeline under the action of the booster pump, and is sprayed into reaction liquid of the baking varnish room waste gas treatment device through the nozzle, the waste gas treated by the reaction liquid is further adsorbed by the adsorption layer and is discharged through the gas outlet pipeline, and the treatment of the waste gas of the baking varnish room is completed after the process is carried out for 1-1.5 hours;
the reaction solution contains a catalyst and H2O2Wherein the catalyst is a Cu-Mn-Ce-O catalyst;
the Cu-Mn-Ce-O catalyst in the reaction liquid accounts for 0.025 to 0.1 percent by mass;
h in the reaction solution2O2The mass percentage content is 0.1-0.25%;
the pH value of the reaction solution is 1.8-11.8;
the volume of the reaction liquid is 20 to 30 times of the volume of the waste gas entering the air inlet pipeline of the baking finish house per minute;
the pressure of the waste gas of the baking finish house after the action of the booster pump is 0.125MPa (A) to 0.2MPa (A);
the distance between the nozzle and the bottom of the device is 1/3-1/4 of the vertical distance between the bottom of the device and the liquid level of the reaction liquid;
the gas temperature of the waste gas of the baking finish house after passing through the heat exchanger is 100-150 ℃;
the adsorption layer is an activated carbon fixed bed, and the height of the bed layer is 1/3-1/2 of the vertical distance between the bottom of the device and the liquid level of the reaction liquid;
the Cu-Mn-Ce-O catalyst has the molar ratio of Cu to Mn of 0.5-2;
the Cu-Mn-Ce-O catalyst has a molar ratio of (Cu + Mn) to Ce of 1-3;
the specific surface area of the Cu-Mn-Ce-O catalyst is 3m2/g～40m2/g。
2. The waste gas purification process of the baking finish house according to claim 1, characterized in that: the aperture of the Cu-Mn-Ce-O catalyst is 1 nm-15 nm.
3. The waste gas purification process of the baking finish house according to claim 1, characterized in that: the pore volume of the Cu-Mn-Ce-O catalyst is 2.5cm3/g～10cm3/g。
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