Spray paint exhaust gas is mainly composed of volatile solvents, diluent molecules and non-volatile paint atomizer mixture. Paint the solvent or diluent mixture composition is very complicated. As paint mist particles are small, viscous, easy to adhere to the surface of the material, purify the organic waste gas must be removed before the paint mist, the traditional paint mist removal method generally used spray painting room, but the method of purification efficiency is low, can not meet the pretreatment requirements.

The use of new modified activated carbon material; increased spray washing - multi-layer filtration pretreatment process; composite carbon bed adsorption tank structure and high temperature steam staged desorption, fractional condensation recovery of new processes; spray paint mixed organic waste gas can only solve Catalytic incineration can not be purified and recovery problems.

Technology key

(1) solve the problem of activated carbon inactivation

Add a washing step: the use of atomized washing - multi-layer filtration process, the paint mist before entering the adsorption tank removed. The basic principle is to make full use of gas and liquid contact between the paint mist in water droplets or water film, or humidifying particles, so that these particles by turbulence, molecular diffusion and other effects by the filter block, to achieve separation and removal of paint The purpose of fog.

(2) to solve the problem of simultaneous adsorption of mixed gases with different physical characteristics

Composite carbon bed adsorption tank structure, the different modified activated carbon layered stacked in the adsorption tank, easy adsorption of different physical characteristics of organic waste gas molecules.

(3) to solve the problem of desorption of mixed gas with different physical characteristics

Adopting the process of high-temperature steam staged desorption; controlling the temperature of the adsorption tank, desorbing with low boiling point and desorbing with high boiling point, so as to reach the stage of desorption.

(4) to solve the mixed gas condensation problem

Adopting the technology of fractional condensation separation, the water vapor and the gaseous solvent become liquid after condensation, and the automatic separators of long flow channel and multi-separation are designed according to their specific gravity. The organic solvents with high and low boiling point are separated from water by different time .

The main technical indicators and conditions

First, the technical indicators

After the spray paint exhaust gas is purified and recycled, the poisonous and harmful gases can reach the standard discharge and meet the secondary standard in the integrated discharge standard of air pollutants (GB16297-1996); the recovery rate of the organic solvent is not less than 90%; Removal rate is greater than 95%; Recycled organic solvent reuse rate of 100%.

Second, the conditions required

With good sealing on the production line and no leakage of waste gas, the total recovery rate of organic waste gas from the plant can reach more than 90%. The sealing performance on the production line has a positive correlation with the total recovery rate.

Major equipment and operation management

First, the main equipment

3 adsorption tanks, 30 ~ 75kW high-pressure induced draft fan, 1 steam boiler, 1 compressor and gas tank, 3 PLC automatic operation electric control cabinet, 3 air and water coolers, condenser, cooling tower, compressed air 1 set of control system, 1 set of steam control system, 1 set of cold water circulation control system, 1 set of pressure and temperature alarm system.

Second, operation and management

Device can be man-machine interface, automated operation, simple operation and stable, safe and reliable. Using online monitoring, control technology, system design multi-channel automatic control security alarm and chain protection. The use of pneumatic remote control, to ensure that the exhaust air duct, solvent pipe without electrical contact, the absolute elimination of electrical contacts spark security risks.

Investment returns

First, the investment situation

A total investment of 3.5 million yuan, of which 2.9 million yuan investment in equipment; operating costs 1.8 million / year; the main equipment life of 10 years.

Second, the economic benefits

VOCs generated in the drying room will be discharged after being purified and recycled. The emission of VOCs will be reduced to 950 tons per year. All the recovered solvents will be recycled and the economic benefits of solvent recovery will reach 8 million yuan annually.

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