Chuzhou Spray Painting Exhaust Gas Purification Equipment - Spray Painting Room Construction - Paint Mist Exhaust Gas Treatment Manufacturer

The painting and baking operations of products generate a lot of harmful gases, and this production process has a high exhaust gas volume and low organic matter concentration. This article adopts advanced technology to plan a useful treatment plan for purifying organic waste gas. This plan uses a new type of activated carbon to adsorb low concentration organic waste gas. After full adsorption, it is heated with hot air and undergoes incineration purification treatment under the catalytic effect of precious metals, converting organic matter into substances. The results indicate that activated carbon can effectively adsorb organic waste gas and complete purification operations.

In the production process of spray painting and baking paint for some products, there will be a lot of process exhaust emissions, which cause significant damage to the natural environment and pose a great threat to the health of operators. Specifically, processes such as spray painting and baking require the use of many volatile compounds such as benzene, toluene, ethylbenzene, and ethyl acetate as coating solvents and diluents. These organic solvents will not adsorb onto the surface of the workpiece during spraying, but will evaporate completely into the air and become organic waste gas. These exhaust gases have characteristics such as low boiling point and easy evaporation at room temperature, which have a significant impact on the surrounding environment and the health of operators.

The content of volatile organic compounds in the air of some large cities in China is several times higher than that of cities in the United States, and the organic waste gas emitted from industrial production has become the main factor of urban air pollution in China. When these gases evaporate, they produce irritating odors that can cause significant harm to the operator's body. Short term exposure can lead to nausea, dizziness, and other symptoms. Many absorbed gases can also damage the internal organs and nervous system of the human body. Therefore, in industrial production activities, in addition to adopting necessary protective measures, it is also necessary to prevent the emission of organic waste gas as much as possible and collect and purify organic waste gas.

1 Basic principle

This plan uses honeycomb shaped activated carbon as an adsorbent, and through the principles of adsorption purification, desorption regeneration, concentration of volatile organic compounds (VOCs), and catalytic incineration, the goal of air purification is achieved by adsorbing high air volume and low concentration organic waste gas through honeycomb shaped activated carbon. After the activated carbon is fully adsorbed, it is then regenerated by hot air desorption. The concentrated organic matter obtained from desorption is sent to the catalytic incineration bed for catalytic incineration, where the internal organic matter is oxidized into CO2 and H2O. After incineration, the hot exhaust gas is heated by a heat exchanger to produce cold air. After heat exchange, the cooled gas is partially discharged and partially used for the desorption and regeneration of honeycomb activated carbon, achieving the goal of energy conservation. The entire equipment includes pre filters, adsorption beds, catalytic incineration beds, and fans.

Compared with other organic waste gas treatment methods, this method is an inductive treatment form that draws on the advantages of other forms. Its skills are relatively mature and reliable, and it has significant advantages in treating high air volume and low concentration organic waste gas. Under the catalytic incineration effect, the purification effect can be achieved.

Process planning for 2 treatments

2.1 Preprocessing

Regarding organic waste gas, people should first carry out water spraying to remove impurities and soluble organic matter inside the waste gas. After spraying, there is a lot of moisture and a small amount of dust inside the gas. In order to prevent moisture and dust from affecting the effective operation of the activated carbon adsorption bed, it is necessary to use filters with high filtration efficiency during processing.

2.2 Adsorption operation

The pre treated organic waste gas is introduced into the adsorption bed under the effect of a fan and evenly distributed on the surface of the activated carbon. According to the van der Waals forces between molecules, activated carbon will adsorb organic waste gas on its surface. This process takes less time, but the longer the time, the more complete the adsorption. There is no significant chemical reaction between the two, while the organic waste gas achieves a high purification effect. After purification, the clean exhaust gas can meet the emission standards of relevant atmospheric pollutants. With the effect of the fan, it can meet the emission standards of a 15m high exhaust pipe. Each exhaust gas purification treatment system contains adsorption beds at different levels, with two sets used for adsorption and one set used for desorption, and three sets of equipment capable of rotating operations.

2.3 Desorption and Catalytic Incineration

The detailed reaction equation is:

After the activated carbon is fully adsorbed, switch to the desorption bed, which requires additional heat for desorption. The heating device is installed inside the catalytic oxidation bed and starts preheating the catalyst together. After the catalytic oxidation bed reaches the set temperature, hot air is introduced into the desorption bed, and the organic waste gas is completely decomposed from the surface of the activated carbon under the heating effect.

The high concentration organic waste gas enters the oxidation bed under the effect of external force, and through the catalytic effect of platinum metal, it is incinerated and decomposed into H2O and CO2. The waste gas is purified through this operation. The characteristics of this incineration process are low temperature, fast and flameless, and generate significant heat. People can reuse activated carbon for the desorption and incineration oxidation of organic waste gas, thereby reducing energy consumption. The detailed reaction process is shown in Figure 1.

When the concentration of organic waste gas is high, excessive heat generated during incineration can lead to a higher temperature in the catalytic oxidation bed, which in turn affects the performance of the entire waste gas treatment system. Therefore, the system planned in this article includes a cold air compensation device that can introduce fresh air to reduce the reaction temperature and ensure the operability of the system.