Treatment method and system for sprayed VOCs (Volatile Organic Chemicals) mixed gas

Abstract

The invention provides a treatment method and system for sprayed VOCs (Volatile Organic Chemicals) mixed gas. The method comprises the following steps: firstly, removing paint mist in mixed gas; then raising the temperature of the gas without the paint mist to 320 DEG C to 350 DEG C; and carrying out a catalytic oxidization reaction under a catalytic condition of a catalyst to thermally decompose the mixed gas into high-temperature flue gas containing a carbon-oxygen compound and a hydrogen-oxygen compound, and then discharging out the high-temperature flue gas. The system comprises a paint mist removing device for removing the paint mist in the sprayed VOCs mixed gas, a heating unit for heating the sprayed VOCs mixed gas, a catalytic oxidization reaction chamber and a centralized emission device, wherein the paint mist removing device is provided with a gas inlet of the sprayed VOCs mixed gas and a gas outlet of the sprayed VOCs mixed gas; the gas outlet of the paint mist removing device is connected with the gas inlet of the heating unit; the gas outlet of the heating unit is connected with the gas inlet of the catalytic oxidization reaction chamber; and the gas outlet of the catalytic oxidization reaction chamber is communicated with the centralized emission device, and the catalytic oxidization reaction chamber is internally filled with a catalyst and a heat accumulation body.

Description

technical field [0001] The invention belongs to the field of organic waste gas pollution treatment or control, and relates to a treatment method and system for spraying VOCs mixed gas. Background technique [0002] At present, my country has become one of the largest automobile production bases in the world. In the automobile manufacturing process, the spraying process is the most polluting link to the environment. Volatile organic compounds (VOCs) produced in general spraying workshops are organic compounds with a saturated vapor pressure Ps≥0.133kpa at 25°C, and are mainly composed of benzene, toluene and xylene. A hydrocarbon combustible mixture, the Substances seriously restrict the sustainable development of human society and threaten the natural environment on which human beings depend. [0003] The current treatment technologies for ultra-low concentration VOCs mainly include adsorption, absorption, condensation, membrane separation, thermal destruction, plasma, biol...

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Problems solved by technology

[0008] For the above-mentioned deficiencies in the prior art, the technical problem to be solved in the present invention is: the device used in the processing method for the prior art to process paint mist VOCs mixed gas is huge, consumes a lot of energy, and has no effect on the paint mist removal effect and efficiency. It is not high, and there is no treatment for the organic matter contained in the paint mist, which will cause technical problems of secondary pollution. However, a simple and compact system, low energy consumption, high treatment efficiency for the mixed gas of paint mist VOCs, and is reducing Processing method and system for spraying VOCs mixed gas that minimizes other pollution to the environment during the discharge of gas pollutants

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