Method and device for treating toxic and harmful air pollutants

Abstract

The invention discloses a method for treating toxic and harmful air pollutants. The method comprises: intensively collecting paint waste gas containing paint mist particles and volatile organic substances in a paint spraying workshop through a pipe, feeding the paint waste gas into a paint mist purifying device with a built-in metal filter, adhering the paint mist in the paint waste gas to the surface of the metal filter, discharging the volatile organic substances in the paint waste gas through gaps of the metal filter and an outlet of the paint mist purifying device, feeding the waste gas into a condenser, carrying out cooling, feeding the waste gas into activated carbon for adsorption purification, discharging the waste gas into the atmosphere, after the paint mist purifying device works for some time, feeding the paint waste gas into the paint mist purifying device with the built-in metal filter, carrying out filtration treatment, carrying out condensation and activated carbon adsorption purification and heating to regenerate the paint mist purifying device after treatment on the paint waste gas. The method solves the dry purification problem of paint mist treatment, has a simple structure and realizes efficient regeneration and recycling.

Description

Technical field: [0001] The invention relates to the field of environmental engineering, in particular to a treatment method and device for toxic and harmful air pollutants. technical background: [0002] A large amount of toxic and harmful air pollutants are produced during the paint spraying process. [0003] The spraying process is widely used in chemical industry, automobile, shipbuilding, furniture and other industries. The organic waste gas generated during the painting process has adverse effects on the environment and human health. During the painting process, most of the paint sprayed by high-pressure air stays on the workpiece, and other spray particles that do not reach the sprayed surface and the water droplets that dissolve the spray paint particles are suspended in the air, and the volatile organic compounds generated during the spraying process are formed. Toxic harmful organic waste gas pollutes the environment. [0004] The toxic and harmful organic waste ...

AI Technical Summary

Problems solved by technology

This method has no secondary pollution and no waste water; the disadvantage is that the filtration is not thorough enough, which seriously pollutes the equipment and is easy to block

[0008] Compared with the wet purification method, the dry purification method is not stable enough in performance. However, since the United States and other countries have regarded the paint-containing wastewater discharged from wet purification as hazardous waste, companies have begun to abandon the wet purification method and use dry purification without wastewater discharge. Purification method

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