What Are the Plans for VOC Waste Gas?

VOCs refer to various organic compounds with a boiling point of 50 ° C to 260 °C at normal temperature. VOCs participate in the formation of ozone and secondary aerosols in the atmospheric environment, which have important effects on regional atmospheric ozone pollution and PM2.5 pollution. Most VOCs have unpleasant special odors, and they are toxic, irritating, teratogenic and carcinogenic. So, it is significant to deal with organic waste. In this article we will introduce VOCs governance solutions for various industries. Valves play an important role in these machines for processing VOCs.

1. VOCs Treatment in Hazardous Waste Industry

During the production process in this industry, the volatilization of VOCs in raw materials causes environmental pollution and direct harm to workers. Now it needs to be treated to reduce pollution and achieve discharge. The air volume of the VOCs to be treated is 62,000m³ / h, the concentration is 100mg / m³, the temperature is normal temperature, and the humidity is 70%.

The treatment plan is to exhaust the generated exhaust gas into a runner for pre-concentration and then catalyze the combustion to achieve the goal of meeting the emission standards. The design system includes a zeolite runner and a CO furnace. The zeolite runner concentration device has a processing capacity of 62,000 m³ / h, a concentration capacity of 30 times, and a removal efficiency of ≥90%. The gas volume of the CO furnace is 2000 Nm³ / h, and the removal efficiency is ≥98%.

2.Governance of VOCs in the Track Industry

The industry has volatile organic gases involving toluene, xylene, ethylbenzene, trimethylbenzene, and propylene glycol methyl ether acetate in the dipping process. The treatment processes are pretreatment, zeolite concentration runners, and thermal storage combustion processes.

The exhaust air volume is 10,000m³ / h, and the concentration range is 300 ~ 1200mg / m³. Exhaust gas temperature is normal temperature, ≤25 ℃, humidity ≤70% relative humidity. The treatment plan is to adopt the process route of rotor adsorption concentration and RTO regenerative combustion. The exhaust gas of the dipping workshop is extracted by the process fan, and at the same time, the state of maintaining a slight negative pressure in the dipping cabin is ensured, and fresh air is constantly entering the air exchange. The exhaust gas extracted by the process fan is sent to dry filtration. The dry filter can remove unfavorable particles. The pre-treated exhaust gas is then sent to the rotary adsorption and concentration device. The VOCs components in the exhaust gas are absorbed by the zeolite and discharged to the atmosphere.

The desorption fan takes a part of the purified gas discharged from the runner to exchange heat with the hot gas of RTO. The temperature reaches 150 ~ 180 ° C. The zeolite runner is desorbed . The desorbed gas is sucked and drawn into the RTO by the RTO fan for combustion and decomposition. The desorbed and concentrated exhaust gas is heated to more than 750 ° C in the RTO reaction device, burned into carbon dioxide and water, and discharged to the atmosphere.

3.Governance of VOCs in the Electronics Industry

According to relevant national laws and regulations, manufacturers in this industry need to install supporting VOCs treatment equipment to build integrated circuit production plants to meet national emission standards. The air volume to be treated is 50,000m³/h, the main components are non-methane total hydrocarbons such as PGME, PGMEA, IPA and acetone. The temperature is 25 ° C, and the emission concentration is 100-150mg / m³.

The treatment plan is designed to use two sets of zeolite runners for concentration and direct combustion thermal oxidation (TO). The exhaust gas is sent to the zeolite runner by the main process fan, and the VOCs in the exhaust gas are adsorbed by the zeolite and discharged to the atmosphere. VOCs are desorbed from the zeolite by the hot gas delivered by the desorption fan, and then sent to the TO reactor by the TO fan, which is oxidized to carbon dioxide and water, and discharged to the atmosphere when it meets the standards.

4.Governance of VOCs in Construction Machinery Industry

The solvent volatilization during the spraying, leveling and baking of the paint line, the volatilization of the generated VOCs causes environmental pollution and direct harm to workers. In order to respond to the government's requirements for environmental protection and emission reduction, and to better fulfill social responsibilities, manufacturers should treat VOCs exhaust gas to reduce pollution and achieve up-to-standard emissions.

The process of this scheme uses rotary enrichment and RTO. The air volume is about 200,000m³ / h, and the calculation is based on the temperature of about 35 ° C and the humidity of about 90%. It should work for 8 hours per day and 250 days per year. The concentration of VOCs is about 103.7mg / m³, the concentration of the wheel is 40 times, and the initial concentration of VOCs gas is less than 100mg / m³, and the concentration of VOCs gas after the treatment is less than 5mg / m³.

And in all the machines used when processing VOCs, valves are very important. After introducing the four treatment of VOCs, I hope this passage can be helpful for you.