Electrophoresis drying

In the drying type work of the electrophoresis line, there will be a certain amount of organic waste gas produced, the waste gas produced by the electrophoresis line is mainly in three areas: one is the spraying process, the second is the drying process, and the third is the spraying process of the paint mist link. In the drying process, there will be some thermal decomposition products of polymers produced in the electrophoresis line, in addition to the treatment of exhaust gases, but also the purification of wastewater treatment, in order to meet the requirements of the environmental protection department.

Electrophoresis drying exhaust gas composition: the main harmful substances are: benzene, toluene, xylene, esters, ketones, alcohols, amines, aldehydes, isocyanates.

Exhaust emission standards, with reference to the "Volatile Organic Compounds Control Emission Standards" (GB37822-2019), "Shandong Province Volatile Organic Compounds Emission Standards" (DB37-2801), the following table of exhaust emission standards:

(1) information provided by the owner in relation to the project
(2) "Law of the People's Republic of China on Environmental Protection" (2015-01-01)
(3) "Air Pollution Prevention and Control Law of the People's Republic of China" (2016-01-01)
(4) Ambient Air Quality Standards (GB3095-2012)
(5) "Law of the People's Republic of China on the Promotion of Cleaner Production", Decree No. 72 of the President of the People's Republic of China
(6) National Environmental Protection "Thirteenth Five-Year" Plan
(7) "Comprehensive Emission Standards for Air Pollutants" (GB16297-1996)
(8) "Emission Standards for Odor Pollutants" (GB14554-1993)
(9) "Environmental Protection Design Code for Construction Projects" (GB50483-2009)
(10) "Design Code for Heating, Ventilation and Air Conditioning" (GB50019-2003)
(11) "Building Design Fire Code" (GB50016-2014)
(12) "Code for the design of power supply and distribution systems" (GB50052-2009)
(13) "Emission Standards for Volatile Organic Compounds Control in Industrial Enterprises" DB13/2322-2016

Considering the operation cost and safety of the paint spraying exhaust gas to be treated, the proposed process route uses "catalytic combustion + activated carbon adsorption desorption + auxiliary cooling" for effective exhaust gas treatment. The process equipment diagram is as follows:

Catalytic combustion + activated carbon adsorption and desorption + temperature reduction

(1) After the waste gas is pretreated to remove dust and particulate matter, it is sent to the activated carbon adsorber. When the activated carbon adsorber Ⅰ is close to saturation, firstly, the treated gas is automatically switched to the activated carbon adsorber Ⅱ (activated carbon adsorber Ⅰ stops adsorption operation), and then the hot airflow is used to desorb and desorb the activated carbon adsorber Ⅰ to desorb the organic matter from the activated carbon. In the desorption process, the organic waste gas has been concentrated, the concentration is tens of times higher than the original, up to 2000ppm or more, the concentrated waste gas is sent to the catalytic decomposition device, and finally it is discharged as CO2 and H2O.
(2) After completing desorption and desorption, the activated carbon adsorber Ⅰ enters the standby state, and when the activated carbon adsorber Ⅱ is close to saturation, the system automatically switches back and desorbs and desorbs the activated carbon adsorber Ⅱ at the same time, so the cycle works.
(3) When the concentration of organic waste gas reaches 2000ppm or more, the catalytic bed can be maintained in self-ignition without external heating. This solution not only saves the energy consumption greatly, but also reduces the equipment investment because the processing capacity of catalytic decomposer is only 1/10 of the original exhaust gas processing capacity. This solution is suitable for both continuous and intermittent operation.

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