The spray painting work in the automotive repair profession is generally reflected as non continuity, influenced by the characteristics of the profession. Spray painting generally involves repairing the parts of the vehicle, and spray painting and drying are mostly integrated. This determines that the exhaust emissions from spray painting and spraying in the automotive repair profession have the following characteristics:

1. The mixed use of oil-based paint and water-based paint, in accordance with the requirements of departmental source management and the increasing variety of paint types, water-based paint is being used in more and more aspects, and traditional paint is gradually being replaced. But because water-based paint is not yet mature, it can only be partially used in the short term and is showing an increasing trend year by year, and cannot completely replace oil-based paint. Therefore, in this context, more emphasis is placed on the mixed use of two types of paints. It is necessary to take into account the VOCs management process when considering.

2. The characteristics of car spray painting operations are high air volume and low concentration, which require a high gas flow rate on the surface of the paint layer. Therefore, although the spray painting volume is not large, the air volume setting is not small. Generally, the spray painting room is divided into two types of air volume, one is 15000m3/h, and the other is 25000m3/h. The concentration is fundamentally between 100-300mg/m3. According to the emission standards of Beijing, the concentration of non methane total hydrocarbons should be; 20mg/m3, which requires that the purification power should not be lower than 80%.

3. Due to limited space and lack of power supply, the installation position of the old paint spraying room is fixed. As time goes on, the workshop's pipelines, items, and things will occupy the space, making it difficult to have a large space to install and install new equipment; And the electrical load is usually determined at the beginning of factory construction, and subsequent expansion is very troublesome. Therefore, when considering the installation of VOCs spray painting exhaust gas treatment equipment, these factors should be taken into consideration as much as possible. It is an ideal practical choice to replace the old equipment in the original location, and the energy consumption of the new equipment should be as low as possible.

4. Excellent pre-treatment is required, and the treatment of paint mist is the focus and difficulty of spray painting exhaust gas treatment. The power of paint mist removal directly affects the function and service life of subsequent purification equipment. For the automotive repair profession, as the amount of paint used is not large, using a three-level filter can solve the problem.

5. Intermittent work: Usually, one vehicle is sprayed and baked before switching to another. There is a time distance between primer and topcoat work, and there is a time distance between changing vehicles and open spaces. These characteristics determine the discontinuity of exhaust emissions, which is reflected in the requirement for purification equipment to be ready to use.

Benzene in paint spraying and baking exhaust gas: Benzene, chemical formula C6H6, is a colorless, slightly sweet liquid at ordinary temperatures, and has a strong aromatic taste. Benzene can be incinerated and toxic, making it a substance that can cause cancer. Benzene is also a type of hydrocarbon, which is a brief type of aromatic hydrocarbon. It is difficult to dissolve in water, but it can also be used as an organic solvent when dissolved in some organic solvents. Benzene is a fundamental raw material in the petrochemical industry, and its production quantity and skill level are important indicators of the development level of the petrochemical industry. The ring system possessed by benzene is called the benzene ring, which is also a simplified type of aromatic ring.

Toluene in paint spraying and baking exhaust gas: Toluene is a colorless, very clear liquid with a slightly similar taste to benzene, and has strong refractive properties. It can be mixed and dissolved with ethanol, ether, acetone, chloroform, carbon disulfide, and glacial acetic acid, and its solubility in water is very small. Toluene is a simple incineration liquid, and vapor can react with air to create a mixture with explosive properties, which is slightly irritating.

The components in the exhaust gas from spray painting and baking paint have certain complex characteristics and toxicity, and are simple to burn and explode. During management, it is necessary to use high-pressure fans to extract the spray exhaust gas into the cyclone tower for treatment.

Deodorants use plant extraction techniques to extract useful ingredients from the roots, stems, leaves, and flowers of various plants. Under the action of radiation, they exert force and improve the activity of plant fluids. They can quickly undergo chemical reactions such as polymerization, substitution, displacement, and adsorption with various harmful and odorous molecules. The product is neutral and effective in removing waste gas, odor, and odor. Put the deodorant into the circulating water of the spray tower, and during the circulation process, the deodorant reacts with odor molecules to generate substances that are harmful to the air. The waste gas management of spray painting enterprises is so simple.

The article originates from a deodorant manufacturer http://www.scneng.com.hk