About Automotive Coating Production Technology VOCs (Volatile Organic Compounds) treatment technology as follows:
1, for different paint exhaust gas, different manufacturers have adopted different methods, the following on the automotive coating exhaust gas treatment technology for the initial shallow analysis.
According to the car painting production process, painting exhaust mainly from the spraying, drying process. Emissions of pollutants are mainly: Paint spray generated when the fog and organic solvents, volatile volatile organic solvents.
Paint mist mainly comes from the part of the solvent-based paint which is sprayed in the air spraying operation, and its composition is consistent with the paint used. Organic solvents mainly come from the solvents and diluents used in coatings. Most of them are volatile emissions. The main pollutants are xylene, benzene and toluene.
2, vehicle production line exhaust gas treatment methods
2.1 activated carbon adsorption - desorption purification device
Adopting honeycomb activated carbon as adsorbent, the principle of adsorptive purification, desorption regeneration, VOC concentration reduction and catalytic combustion is adopted to purify the air by adsorbing the high-volume and low-concentration organic waste gas through the honeycomb activated carbon.
When the activated carbon is adsorbed, the activated carbon is regenerated by hot air desorption. The concentrated organic matter is desorbed to the catalytic combustion bed for catalytic combustion. The organic matter is oxidized into harmless CO2 and H20. The hot exhaust gas after combustion passes through the hot The exchanger heats the cold air, and releases part of the gas which is cooled after the heat exchange, partly for the desorption and regeneration of the honeycomb activated carbon so as to achieve the purpose of waste heat utilization and energy saving.
The whole device consists of pre-filter, adsorption bed, catalytic combustion bed, flame-retardant, related fans, valves and other components.
Activated carbon adsorption - desorption purification device based on adsorption and catalytic combustion of two basic principles of design, the use of double gas continuous work, a catalytic combustion chamber, the two beds alternately.
First, the organic waste gas is adsorbed on the activated carbon, and the adsorption is stopped when it reaches saturation, and then the activated carbon is desorbed from the activated carbon by a hot air stream to regenerate the activated carbon; the organic matter after desorption has been concentrated (the concentration is increased by several tens times) Sent to the catalytic combustion catalytic combustion into carbon dioxide and water vapor emissions.
When the concentration of organic waste gas reaches more than 2000PPm, the organic waste gas can maintain spontaneous combustion in the catalytic bed without external heating. Part of the tail gas after combustion is discharged into the atmosphere and most of it is sent to the adsorbent bed for the regeneration of activated carbon.
This can meet the burning and adsorption of heat required to achieve energy-saving purposes. After regeneration can enter the next adsorption; in the desorption, the purification operation can be carried out with another bed, both for continuous operation, but also suitable for intermittent operation.
Technical performance and features: stable performance, simple structure, safe, reliable, energy saving, no secondary pollution. Equipment covers an area of ​​small, light weight. Very suitable for use under high winds.
The activated carbon bed adsorbed with the organic waste gas is desorbed and regenerated by the post-catalytic combustion exhaust gas, and the desorbed gas is sent to the catalytic combustion chamber for purifying. The external energy is not required, and the energy saving effect is remarkable.
2.2 Photo-catalytic equipment
The use of special high-energy high-ozone-UV light beam irradiation of malodorous gases, such as malodorous gases: ammonia, trimethylamine, hydrogen sulfide, methylthio hydrogen, methyl mercaptan, dimethyl sulfide, dimethyl disulfide, carbon disulfide and styrene, sulfide H2S, VOC, benzene, toluene, xylene molecular chain structure, so that organic or inorganic polymer malodour compound molecular chain, under the irradiation of high-energy ultraviolet light beam, degradation into low molecular compounds, such as CO2, H2O and so on.
The use of high energy and high ozone UV light beam to decompose oxygen molecules in the air to generate free oxygen, that is, reactive oxygen species, due to the imbalance of positive and negative electrons carried by the free oxygen, oxygen molecules need to be combined to generate ozone. UV + O2 → O- + O * (active oxygen) O + O2 → O3 (ozone), it is well known that ozone has a strong oxidizing effect on organic matter and has an immediate effect of removing odor and other irritating odors.
In addition, the system uses a unique seven kinds of photocatalytic coating materials prepared by our company's own technology, which can rapidly decompose, chain and oxidize waste chemical molecules, change the material structure, and crack and oxidize the polymer pollutants Become a low molecular weight harmless substance. Is designed for a variety of pharmaceuticals, chemicals, tires and other exhaust gas treatment and wastewater, sludge and garbage and leachate treatment process, such as odor treatment equipment. Technical performance and characteristics: Photooxygen catalytic exhaust gas treatment technology is actually a special band of high-energy crushing, ozone decomposition of the exhaust gas oxidation and catalyst reaction amplification amplification and a series of synergies, the degradation of odor substances into non-toxic and tasteless Of low molecular compounds, water carbon dioxide, to purify the air.
2.3 plasma exhaust gas purification equipment
RH series of plasma organic waste gas purifier products are designed on the basis of similar products and products after many years of practice and further research. It adopts the unique "adsorption-decomposition-carbonization" latest technology Design, the standard module design, etc., is a "dry process" of organic waste gas purification equipment.
It changes the technology of using activated carbon materials, no need to regenerate raw materials, no special responsibility, no secondary pollution, easy replacement and maintenance (can be replaced and maintained under normal operation of equipment) RH Series Plasma Organic Waste Gas Purification Products: No need someone to exhaust ventilation, wind resistance is small, easy to install, according to customer requirements site environment group manufacturing, to facilitate the transport into the installation. Equipment compact, low investment, easy to manufacture, the product is made of standard materials, or made of stainless steel, air volume 5000-50000m3 / h, is currently dealing with industrial organic waste gas pollution in advanced equipment.
RH series of plasma organic waste gas purifier products, the use of high-pressure generator to form a low-temperature plasma, the average energy of about 5eV a large number of electrons through the purifier benzene, toluene, xylene and other organic waste gas molecules into a variety of active particles , Combined with the O2 in the gas to generate H2O, CO2 and other low molecular non-hazardous substances, so that the exhaust gas purification
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