Paint booth exhaust gas treatment programme

Paint spray booth in the paint spraying process will produce a large amount of exhaust gas, these exhaust gas air volume, low concentration, the main content of benzene, toluene, xylene, etc., these VOCs exhaust gas if not treated and directly discharged not only affect human health but also the surrounding environment has a great impact on the paint spray booth exhaust treatment programme should be how to choose it? The following with the Everest blue editor to take a look~

Before choosing a paint spray booth exhaust treatment solution, let's analyse what kind of substances are contained in this kind of exhaust gas.

Generally speaking, there are three main hazardous substances in the exhaust gas emitted during the painting process in the paint spray booth:

1, paint spraying process, independent of the paint particles suspended in the exhaust gas;

2, oil-based paint: carrying paint particles of water beads; water-based paint: dissolved paint particles of water beads;

3, gasification state of the paint itself raw material odour, thinner (room temperature paint curing agent) Phi odor, and in the reaction and curing process of the release of odour.

Following the environmental protection policy is becoming more and more strict, only a device has been unable to meet the environmental requirements, it is necessary to take with a complete set of dust removal in addition to exhaust gas purification equipment.

Paint booth exhaust treatment programme: filtration + adsorption method

Paint exhaust generated in the spraying process, liquid paint under the action of air pressure to form atomised dust particles and volatile organic waste gas such as benzene, small particle size, high concentration, the vast majority of the following 10μm, if not pre-treated, it will quickly block the microporous activated carbon, activated carbon adsorption failure.

Paint spraying exhaust gas through the water curtain cabinet cleaning, paint mist play a good role in cleaning and degradation, exhaust gas into the paint mist filter, paint mist filter filled with special paint paint mist filter material, more than 95% of the paint dust, exhaust gas through the purification, through the pressurised induced draft fan into the activated carbon adsorption tower, the organic exhaust gas is activated carbon adsorption in the bed.

Activated carbon adsorption is adapted to large flow, low concentration of organic waste gas, activated carbon using granular activated carbon, specific surface area (adsorption area) as high as 500-1500m2/g. Specific surface area is large, and thus has a high surface activated carbon and adsorption capacity.

Paint booth exhaust gas treatment programme: filtration + catalytic combustion method

The organic waste gas produced by the paint spraying room is collected through the collection cover and pumped to the workshop through the pipeline into the paint dust pretreatment equipment and then into the adsorption + desorption + catalytic combustion exhaust gas purification device.

Exhaust gas first through the dust filter in the filter layer, to remove dust particles, purified gas and then into the activated carbon adsorption tower placed with honeycomb activated carbon (activated carbon adsorption bed for one use), and the honeycomb activated carbon full contact with the use of activated carbon on the strong adsorption of organic substances will be purified, the treated gas can be discharged to meet the standards.

The function of this equipment is not chaotic and can achieve the expected results. Adsorption bed after a period of operation will reach adsorption saturation, desorption ---- catalytic combustion self-balancing process starts 1 hour after the automatic rotation of the work, at this time to open the desorption and regeneration system, desorption and regeneration of the activated carbon (do not need to replace the activated carbon), desorption of the gas out of the gas through the catalytic combustion device combustion of innate carbon dioxide, water and the department's heat and other harmless gases, the whole set of adsorption and catalytic combustion process by the The whole set of adsorption and catalytic combustion process is controlled automatically by PLC.

Activated carbon adsorption saturation can be regenerated by hot air desorption. Regeneration of activated carbon back into use, through the control of the desorption process flow can be concentrated 10-15 times the concentration of organic waste gas, desorption of gas flow through the catalytic bed of the combustion machine device heated to 300 ℃ or so, under the action of the catalyst combustion, catalytic combustion process purification efficiency of up to 97% or more, combustion of natural CO2 and H2O and release a large amount of heat, the heat through the catalytic combustion of heat exchangers within the bed of a The heat through the catalytic combustion bed within the heat exchanger a department and then used to heat the high concentration of waste gas desorption, another department of heating outdoor air to do the activated carbon desorption gas use.

Paint spray booth exhaust gas treatment programme: water spraying + adsorption method

Paint exhaust generated in the spraying process, liquid paint under the action of air pressure to form atomised dust particles and volatile organic waste gas such as benzene, small particle size, high concentration, the vast majority of the following 10μm, if not pre-treated, it will quickly block the microporous activated carbon, activated carbon adsorption failure. Paint spraying exhaust gas through the water curtain cabinet cleaning, paint mist play a good role in cleaning and degradation.

Exhaust gas enters the water spray exhaust gas treatment tower, after further cleaning and treatment by wet cyclone plate exhaust gas tower, it enters the activated carbon adsorption tower through pressurised induced draft fan, organic gas is adsorbed by activated carbon in the bed, activated carbon it is adapted to the large flow of low concentration of organic exhaust gas, activated carbon adopts pellet activated carbon, specific surface area (adsorption area) is as high as 500-1500m2/g than the surface area is large, thus it has high surface activated carbon and adsorption capacity. It has a large specific surface area of 500-1500m2/g and thus has a high surface activated carbon and adsorption capacity. The low concentration of organic gas is adsorbed on its active surface and the purified gas is discharged by the external air duct.

Paint spraying room exhaust gas treatment programme: water spraying + photocatalysis + activated carbon adsorption

Paint exhaust generated in the spraying process, liquid paint under the action of air pressure to form atomised dust particles and volatile organic waste gas such as benzene, small particle size, high concentration, the vast majority of the following 10μm, if not pre-treated, it will quickly block the microporous activated carbon, activated carbon adsorption failure. Paint spraying exhaust gas through the water curtain cabinet cleaning, paint mist play a good role in cleaning and degradation.

Paint exhaust gas by the water curtain cabinet cleaning, paint mist play a good role in cleaning degradation, exhaust gas into the water spray exhaust gas treatment tower, the wet cyclone plate exhaust gas tower further cleaning and treatment, through the pressurised induced draft fan into the photocatalytic deodorization equipment, the high-energy ultraviolet irradiation, so that the volatile organic compounds of the chemical bond ring-opening and fracture of a variety of reactions (photochemical reaction), degraded into CO2, H2O and other low molecular compounds, the use of high-energy ultraviolet irradiation, so that the chemical bond ring-opening and fracture of a variety of reactions (photochemical reaction), degradation of low molecular compounds. Molecular compounds, the use of high-energy ultraviolet light irradiation of oxygen in the air born ozone, ozone absorption of ultraviolet light born oxygen radicals and oxygen, oxygen radicals and water vapour in the air born hydroxyl radicals, a stronger oxidant, and alcohols, aldehydes, carboxylic acids and other organic waste gas, thoroughly oxidized to water, carbon dioxide and other inorganic substances into the adsorber for adsorption of activated carbon, exhaust gas purification, the ultimate discharge into the atmosphere through the pipeline. After purification, the waste gas is finally discharged into the atmosphere through pipeline to meet the standard. In order to achieve the best purification effect, after the exhaust gas is decomposed by the photocatalytic deodorisation equipment, the subsequent 3~5 seconds of pipeline reaction time is required. The low concentration of organic gases discharged is adsorbed on its active surface and the purified gases are discharged in the air by the external air duct.