Paint spraying exhaust gas treatment

Spraying exhaust gas is also the exhaust gas generated when spraying paint, the components of spraying exhaust gas and drying exhaust gas are as follows.

Benzene, toluene, xylene, hexane, heptane, methyl ethyl ketone, ethyl acetate, carbon tetrachloride, etc., mainly "triphenyl", volatile organic compounds (VOCs) treatment.

(1) The main components of spray paint exhaust are benzene, toluene, xylene and some dust particles, etc. Most of the spray paint exhaust also contains ethyl acetate, butanone, isopropanol and some ether substances.

(2) The components of spraying exhaust gas have certain complex characteristics, certain toxicity, and easy to burn and easy to explode.

>>Design principles

(1) to assist enterprises to adopt a scientific and reasonable collection method, in the premise of achieving the collection effect, to minimize the amount of gas.

(2) Actively and steadily adopt new technologies and equipment, and adopt advanced and reliable pollution control processes in combination with the current situation and management level of the enterprise, and strive for stable operation, low cost, convenient management and easy maintenance, so as to achieve the purpose of completely eliminating waste gas pollution and protecting the environment.

(3) Properly solve the pollutants generated during the construction and operation of the project to avoid secondary pollution.

(4) Strictly implement the current fire prevention, safety, health, environmental protection and other national and local norms, regulations and standards promulgated.

(5) Select new, high-efficiency, low-noise equipment and pay attention to energy saving and consumption reduction.

(6) The general layout should be compact, reasonable and smooth, simple and practical. Minimize the project area and construction difficulties.

(7) strictly implement the relevant national design codes and standards, pay attention to fire prevention and safety work.

(8) According to the relevant national and local environmental protection laws, regulations and industrial policy requirements for industrial pollution management, give full play to the social benefits, environmental benefits and economic benefits of the construction project.

Design effects:

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

Catalytic combustion + activated carbon adsorption and desorption + fan

(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.

1 Field visit Technical survey

2 Secondary demonstration Provide solutions

3 Technical exchange Both sides visit each other

4 Construction according to the contract Acceptance and delivery

5 File and record service forever