Device and method for adsorption and low-temperature plasma catalytic treatment of waste gas

Abstract

The invention relates to a device and method for adsorption synergizing low temperature plasma to catalyze and treat waste gas. The device comprises an air inlet pipe, a first air pipe, an adsorptionunit, a second air pipe and an air exhaust pipe which are sequentially connected; switch valves are arranged on the air inlet pipe and the air exhaust pipe; the device further comprises a plasma generating unit and a desorption waste gas treatment unit; the plasma generating unit is connected with an air injection branch pipe, an air switch valve is arranged on the air injection branch pipe, the plasma generating unit is connected with the air exhaust pipe through a fifth air pipe and an air exhaust compression pump mechanism arranged on the fifth air pipe, and the air exhaust pipe is connected with a tail gas treatment unit; and an adsorption agent and a catalyst are arranged in the adsorption unit. The adsorption agent desorption and regeneration effect of the device is better, the degradation efficiency to VOCs (volatile organic chemicals) is higher, and the harmful substances and active substances in the tail gas are less; the problem that high-concentration waste gas is directly treated by a low temperature plasma generating unit and thus explosion risks exist is avoided, and the problems that the space is limited, and the by-products are more when the catalyst is placed in the low temperature plasma generating unit are avoided.

Description

technical field [0001] The invention belongs to the technical field of chemical purification of waste gas, and in particular relates to a device and method for adsorption and low-temperature plasma catalytic treatment of waste gas. Background technique [0002] Volatile organic pollution waste gas (hereinafter referred to as VOCs waste gas) is mostly produced in industrial production processes, such as paint production, chemical fiber industry, metal coating, chemical coatings, shoemaking and tanning, plywood manufacturing, tire manufacturing and other industrial production processes, among which Contains a large amount of volatile organic compounds (VOCs), mainly including acetone, toluene, phenol, dimethylaniline, formaldehyde, n-hexane, ethyl acetate, ethanol, etc., which are common air pollutants and endanger the health of exposed people . [0003] At present, there are two types of basic technologies for VOCs treatment. One is recycling technology. The basic idea of ​​...

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Problems solved by technology

When the catalyst is placed inside the low-temperature plasma generator, in addition to using the long-lived active substances in the discharge plasma to degrade VOCs, it can also make full use of transient active substances to effectively degrade VOCs. The degradation efficiency is high, but there are Due to the limited internal space of the low-temperature plasma generator, the number of catalysts filled in it is limited, and there are by-products O 3 and NO x There are many shortcomings. Although the adsorbent is connected in series for secondary treatment, there is no measure for the thermal desorption regeneration of the adsorbent, and the effect of the desorption regeneration of the adsorbent is poor.

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