Wet-process coupling catalytic oxidation waste gas treatment process and device thereof

Abstract

The invention belongs to the technical field of waste gas treatment, and particularly relates to a wet-process coupling catalytic oxidation waste gas treatment process and a device thereof. A hydroxylradical is adopted as an oxidizing agent, hydrogen peroxide is adopted as a hydroxyl radical donor, and a waste gas enters a catalytic oxidation reaction tower with a gas redistributor on the bottompart; a homogeneous catalyst and heterogeneous catalyst coupling system is adopted, hydrogen peroxide is reacted with a homogeneous catalyst and a heterogeneous catalyst in the catalytic oxidation reaction tower so as to generate the hydroxyl radical for carrying out catalytic oxidation reaction on pollutants in the waste gas; during a reaction process, the pH of a reaction medium is adjusted to 3to 5 by using acid or alkali, and the pollutants in the waste gas are degraded at normal temperature. The device enables an overall system of the wet-process coupling catalytic oxidation waste gas treatment process to be a complete set, operates in a wet type, is simple to operate, high in automation degree, safe and reliable, and has a wider application working condition, and a capacity on high-efficiently purifying the pollutants in the waste gas.

Description

Technical field [0001] The invention belongs to the technical field of exhaust gas treatment, and specifically relates to a wet-method coupled catalytic oxidation exhaust gas treatment process and a device thereof. Background technique [0002] With the increasingly stringent requirements for environmental governance, the exhaust emission standards have been repeatedly raised, and it is difficult for conventional technologies to meet the emission standards. Incineration technology is less economical for small gas volume and intermittent working conditions; for inflammable and explosive environments, plasma high-voltage discharge technology cannot be used. [0003] Hydroxyl radicals have a very strong ability to obtain electrons, that is, oxidizing power, with an oxidation potential of 2.8eV. It can react with most organic pollutants in a rapid chain reaction, causing them to be oxidized and decomposed into pollution-free components. Hydroxyl radical oxidation has been widely used ...

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Problems solved by technology

Hydroxyl radical oxidation has been widely used in sewage treatment, but it is difficult to obtain when used in waste gas treatment, and there are problems such as low concentration, low gas-liquid contact rate, and rapid failure, so it is difficult to obtain a good purification effect

[0004] Patent CN 201110100377 uses waste gas to treat wastewater and consumes hydrogen peroxide, both of which have low concentrations, and the two technologies are not comparable; the technology disclosed in patent CN201610044700 has a low generation rate and concentration of hydroxyl radicals, and the rapid loss leads to the use of Low efficiency, high risk of ultraviolet lamps built into the spray tower; Patent CN105561782A discloses effective catalytic oxidation method to treat exhaust gas with chemical ratio and device, but also has low generation rate and concentration of hydroxyl radicals, The problem of low utilization rate and low overall purification efficiency due to the rapid loss before reacting with exhaust gas

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