Denitration method for waste gas generated by burning system and denitration device thereof

Abstract

The invention provides a denitration method for waste gas generated by a burning system and denitration equipment for the waste gas generated by the burning system. The denitration method comprises the following steps of: bringing reducing agent into an electrode region in a plasma reaction container or a reaction region behind the electrode region, where the reducing agent and plasma collide with each other and change the energy, and all or some of the reducing agent is transformed into plasma or is activated into the activated molecules, wherein the mixed gas is led into a NOx-containing waste gas channel, and enters into a reduction reaction room with the waste gas; reducing the NOx into harmless gas such as N2, CO2, and water in case of catalyst or high temperature; and discharging the treated gas through a follow-up discharger. According to the method, the use level of solid reducing agent can be greatly saved, the risk of the leakage of reducing agent components can be reduced, the reaction time can be shortened, and the reaction efficiency of a reactor can be improved.

Description

technical field [0001] The application of the present invention relates to a x The gas purification process can be used in the flue gas of power plants, the exhaust gas of internal combustion engines and other industrial processes that contain NO x Waste gas pollution control. Background technique [0002] It is well known that combustion processes produce large amounts of NO-containing x gas, NO x The concentration can reach hundreds or even thousands of ppmg. NO x It is the general term for all nitrogen oxides, about 90% of which are NO. NO x Released into the atmosphere will lead to the formation of acid rain and air pollution, and if NO enters the stratosphere of the atmosphere, it will also cause the destruction of the ozone layer. NO in flue gas / exhaust gas x It mainly comes from the oxidation of nitrogen-containing compounds in the fuel, and partly comes from the oxidation of molecular nitrogen in the air. In addition to the concentration of nitrogen-containi...

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Problems solved by technology

[0033] A further development is, for example, US Pat No 5,693,300 and US Pat No 4,886,650, through the use of metal catalysts to make ammonia and cyanic acid all or part of free radical active particles to react with NO x Reaction, the required reduction reaction temperature can be greatly reduced like this, but, this method needs to use precious metal catalyst, and use cost is higher, uses solid catalyst bed simultaneously and its reaction condition is more difficult to adjust, and its reaction quality is also difficult to control

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