Qingyuan Environmental Protection Company uses industrial coating, spray painting, and spray production processes, and the main sources of coating exhaust gas come from the spraying and drying processes. The main pollutants emitted are paint mist and organic solvents generated during painting, and organic solvents generated during drying and volatilization. Paint mist mainly comes from the scattering of solvent based coatings during air spraying operations, and its composition is consistent with the coating used. Organic solvents mainly come from solvents and diluents during the use of coatings, with the vast majority being volatile emissions. Their main pollutants are xylene, benzene, toluene, etc. The main sources of harmful exhaust gases emitted during painting are spray painting rooms, drying rooms, and oven drying rooms.

Qingyuan Environmental Protection CompanySpray painting exhaust gas treatment equipment,Spray booth exhaust gas treatment,Spray painting exhaust gas treatmentAdopting a spray tower, photocatalytic and low-temperature plasma comprehensive treatment system.

The water absorption method (spray tower) utilizes the characteristic that certain substances in organic waste gas are easily soluble in water, allowing the organic waste gas components to directly contact water and dissolve in water to achieve the purpose of removal. Some acidic gases will be treated with active alkali, and the spray tower can achieve dust removal, defogging, filtering of paint mist, and dust removal effects. Suitable for organic waste gases from water-soluble and organized emission sources. The process is simple, the management is convenient, and the equipment operation cost is low, but it generates secondary pollution and requires treatment of the washing solution; The purification efficiency is low and should be used in conjunction with other technologies. The treatment effect on organic waste gas is average.

Qingyuan Environmental Protection Photooxidation Catalysis is an upgrade of photochemical and catalytic oxidation methods. It combines photochemical and catalytic oxidation for better treatment effects, without the defects of catalyst poisoning and inability to treat complex exhaust gases. Moreover, its operating costs are lower because the catalyst can also be used at medium and low temperatures, resulting in lower energy consumption. The treatment efficiency of VOCS gases such as toluene, formaldehyde, and xylene can reach over 96% for their odor. After years of scientific research and analysis of thousands of cases, Qingyuan Environmental Protection has found that photocatalytic oxidation is currently an effective and cost-effective waste gas treatment method for VOCs, especially for waste gases with concentrations between 100-300mg/m3.

The Qingyuan environmental protection low-temperature plasma treatment method utilizes the generation of highly chemically active particles inside the plasma, such as electrons, ions, free radicals, and excited state molecules. The pollutants in the exhaust gas react with these high-energy active groups and are ultimately converted into substances such as CO2 and H2O, thereby achieving the goal of purifying the exhaust gas. Wide applicability, high purification efficiency, especially suitable for multi-component organic waste gases that are difficult to treat by other methods, with a small equipment footprint; Electrons have high energy and can interact with almost all organic waste gas molecules; Low operating costs; React quickly, stop quickly, and start as needed. But it is prone to explosion for water containing, dust containing, and organic waste gases, and the one-time investment cost is high.

① Entering the photocatalytic equipment, a specially designed high-energy high ozone UV beam is used to irradiate the waste gas, cracking industrial waste gases such as ammonia, trimethylamine, hydrogen sulfide, methylthiohydride, methyl mercaptan, methyl sulfide, butyl acetate, ethyl acetate, dimethyl disulfide, carbon disulfide, and styrene. The molecular chain structure of sulfur compounds such as H2S and VOCs, benzene, toluene, and xylene is used to degrade and transform the molecular chains of organic or inorganic high molecular weight odor compounds into low molecular weight compounds such as CO2 and H2O under high-energy UV beam irradiation. Utilizing high-energy and high ozone UV beams to decompose oxygen molecules in the air to produce free oxygen, also known as reactive oxygen species. Due to the imbalance of positive and negative electrons carried by free oxygen, it needs to combine with oxygen molecules to produce ozone. UV+O2 → O -+O * (reactive oxygen species) O+O2 → O3 (ozone). It is well known that ozone has a strong oxidizing effect on organic matter and has an immediate effect on industrial waste gas and other irritating odors. After the industrial waste gas is input into this purification equipment through exhaust equipment, the purification equipment uses high-energy UV ultraviolet beams and ozone to synergistically decompose and oxidize the industrial waste gas, causing the degradation and conversion of industrial waste gas substances into low molecular compounds, water, and carbon dioxide, which are then discharged outdoors through exhaust pipes. By using high-energy C-band light beams to break down the molecular bonds of bacteria in industrial waste gas, the nucleic acid (DNA) of bacteria is destroyed, and then oxidized by ozone to achieve the purpose of purification and killing bacteria. From the perspective of air purification efficiency, we have chosen a device that combines C-band ultraviolet light and ozone to generate a high corona current and uses the principle of pulse corona discharge adsorption technology to eliminate harmful gases. C-band ultraviolet light is mainly used to remove the decomposition and fission of gases such as hydrogen sulfide, ammonia, benzene, toluene, xylene, formaldehyde, ethyl acetate, ethane, acetone, urea, resin, etc., turning organic matter into inorganic compounds.

② Entering low-temperature plasma equipment, under the action of an external electric field, a large number of energy carrying electrons generated by dielectric discharge bombard pollutant molecules, causing them to ionize, dissociate, and excite. This then triggers a series of complex physical and chemical reactions, transforming complex large molecule pollutants into simple small molecule safe substances, or transforming toxic and harmful substances into harmless or low toxicity substances, thereby enabling pollutants to be degraded and removed.