Plastic waste gas treatment

1. the composition and content of plastic waste gas is complex, and a single targeted treatment method is basically unable to deal with it;

(1) complex composition of natural or synthetic resins

(2) A wide range of additives

(3) The main components of the exhaust gases of different processes are different

(4) Different production processes have different exhaust gas contents

2. most of the exhaust gases are organic compounds, which are difficult to be treated in the traditional way or are prone to secondary pollution;

3. the exhaust gas contains toxic substances and has obvious odor

4. there may be obvious particulate matter in some processes.

The main components of plastic waste gas: rubber, plastic waste gas odor components are complex and variable, and are roughly divided into five categories:

① compounds containing sulfur: such as H2S, SO2, mercaptans, thioethers;

② dust-like: such as carbon black;

③ Chlorine-containing compounds: such as amides and indoles;

④ hydrocarbons: such as alkanes, alkenes, alkynes, aromatic hydrocarbons;

⑤ organic substances containing oxygen: such as alcohols, phenols, aldehydes, ketones, organic acids, etc.;

Among the inorganic substances are H2S, SO2, carbon black, etc. The vast majority of malodorous gases produced by the primary substances for organic substances. These substances are more harmful to human health.

Since rubber and plastic exhaust gases are produced in more parts and scattered in the workshop, the exhaust gases must be collected before treatment, so the collection system is needed to collect them for unified treatment.

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

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.

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