Device and method for thermal corona discharge and pyrolysis combined treatment of spraying exhaust gas

Abstract

The invention provides a device for treating spraying waste gas jointly through hot corona discharge and high-temperature pyrolysis .The device comprises a reaction barrel, a tangent cyclone inlet, a tangent cyclone outlet, a discharge electrode tube, a spiral heating tube electrode, a high-voltage direct current power source and a heating tube temperature controller .The tangent cyclone inlet is tangent to the barrel wall and is formed in one end of the reaction barrel .The tangent cyclone outlet is tangent to the barrel wall and is formed in the other end of the reaction barrel .The discharge electrode tube is installed on a center shaft of the reaction barrel .The spiral heating tube electrode is installed in the reaction barrel, axially and spirally stretches along the inner barrel wall of the reaction barrel, and is used for high-temperature pyrolysis of the spraying waste gas .The invention further provides a method for treating the spraying waste gas jointly through hot corona discharge and high-temperature pyrolysis .The device and method have the advantages that the granulate matter removal efficiency is high, the VOCs degradation effect is good, and the efficiency of high-temperature thermal degradation of VOCs is high, the purposes of high efficiency, energy saving and avoidance of secondary pollutants are achieved accordingly, the investment and treatment cost is low, operation is easy and convenient, and very wide application prospects are achieved .

Description

technical field [0001] The invention relates to the treatment technology of spraying waste gas, in particular to a device and method for combined treatment of spraying waste gas by thermal corona discharge and high temperature cracking. Background technique [0002] The spraying exhaust gas of the spraying industry (such as wood product surface spraying) contains a large amount of particulate matter and volatile organic pollutants or organic waste gas (VOCs). The main components of the particulate matter are some organic pigments, and the VOCs mainly include various aliphatic and aromatic Alkanes, alkenes, oxygen-containing hydrocarbons and halogenated hydrocarbons, such as benzene, toluene, xylene, formaldehyde and ethyl acetate. These spraying exhaust gases are generally highly irritating and toxic, and have teratogenic, carcinogenic, and mutagenic effects, which have a major impact on human health. In addition, VOCs, as key atmospheric pollutants O 3 It is an important ...

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Problems solved by technology

This method has high removal rate, no secondary pollution, high purification efficiency, convenient operation, and can realize automatic control; the disadvantage is that due to the limited adsorption capacity, it is not suitable for treating high-concentration organic gases. When there are colloidal substances or When there are other impurities, the adsorbent is easy to fail, and the adsorbent needs to be regenerated at the same time

[0005] However, the reactor used is mainly a cold electrode discharge structure. Due to the constraints of the discharge structure, electrode spacing and gas dielectric breakdown, there are generally problems such as insufficient energy density per unit volume of the discharge space and low energy efficiency, which affect practical applications.

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