Spraying waste gas purification method and device

Abstract

A spraying waste gas purification method and device, the method includes the following steps: passing the spraying waste gas into a preheater for heating, drying the paint mist particles in the spraying waste to form paint mist powder; passing the spraying waste gas carrying the paint mist powder into the The dust collector is filtered, and the filtered spraying exhaust gas is passed into the catalytic burner. The above-mentioned device includes a preheater, a dust collector and a catalytic burner. A preheating chamber is arranged in the preheater, and there are many A preheating pipe, one end of the preheating pipe communicates with the inlet of the preheater, the other end communicates with the outlet of the preheater, the outlet of the preheater communicates with the inlet of the precipitator, and the outlet of the preheater communicates with the inlet of the catalytic burner The outlet of the catalytic burner is communicated with the inlet of the preheating chamber through the thermostat. This method skillfully heats the spraying exhaust gas through the preheater, thereby drying the paint mist particles in the spraying exhaust gas, and then filtering the paint mist through the dust collector. Powder, to achieve the filtration of paint mist particles in the spraying exhaust gas, so that the paint mist can be effectively treated, and the filtration is convenient, the filtration effect is stable, and the filtration cost is low.

Description

technical field [0001] The patent of the present invention relates to the field of paint mist treatment in spraying exhaust gas, in particular to a method and device for purifying spraying exhaust gas. [0002] technical background [0003] There are two main components in the exhaust gas generated by the painting industry: paint mist and volatile organic pollutants (VOCs). Paint mist is the granular viscous organic matter that is not attached to the surface of the workpiece produced during the spraying process, and the volatile organic pollutants are mainly derived from the solvent in the paint. At present, the methods of paint mist control in my country are mainly divided into dry method and wet method. The dry method is represented by filter cotton filtration or filter cartridge filtration, while the wet method is represented by water cyclone modification and capture. [0004] The life of the filter cotton is very limited, and the paint mist adheres to the filter cotton ...

AI Technical Summary

Problems solved by technology

[0004] The life of the filter cotton is very limited, and the paint mist adheres to the filter cotton or the filter cartridge, which is easy to harden and cause the filter pores to be blocked, thus seriously shortening the life of the filter material

Although the wet method can effectively control the paint mist, the moisture brought out during the treatment process increases the difficulty of the subsequent treatment process (for example, moisture will compete with VOCs on the surface of the catalyst to reduce the catalytic efficiency, and moisture will occupy the pores of the activated carbon to reduce the efficiency of the activated carbon. Adsorption amount of VOCs)

Images