Flue gas desulfurization and denitrification method and device and application of flue gas desulfurization and denitrification device

Abstract

The invention discloses a flue gas desulfurization and denitrification method comprising the following steps of carrying out heat exchange between flue gas generated by a boiler or a gas turbine and flue gas which is desulfurized and denitrified for the first time to cool the flue gas generated by the boiler; mixing the cooled flue gas and ammonia gas, and then, carrying out spray treatment with water; then, carrying out heat exchange between the flue gas which is desulfurized and denitrified for the first time and flue gas generated by the boiler to heat the flue gas which is desulfurized and denitrified for the first time; and simultaneously carrying out ultraviolet irradiation and electron beam irradiation on the heated flue gas which is desulfurized and denitrified for the first time. By using the method and a device disclosed by the invention, the heat of the flue gas can be effectively utilized to realize the sufficient heat exchange between two kinds of flue gas; and the optimal SOx and NOx removal temperatures are respectively reached in the two treatment processes, so that the desulfurization and denitrification efficiencies can be remarkably increased. The invention also discloses the device applying the method and application of the device.

Description

technical field [0001] The invention relates to the field of flue gas purification, in particular to a method, device and application for treating flue gas desulfurization and denitrification by using electron beams and ultraviolet rays. Background technique [0002] Environmental pollution caused by air pollution seriously threatens human health. Among them, sulfur dioxide and nitrogen oxides emitted by large industrial facilities, including thermal power plants, cement plants, and waste incineration plants, are one of the main sources of air pollution. Therefore, the problem of flue gas desulfurization and denitrification in factories is an important task in the treatment of environmental pollutants. NO in the exhaust of various large diesel engines, marine engines, gas turbines, etc. x Higher content, reduce the NO in the exhaust of these combustion engines x Concentration has also been the focus of attention. In addition, thermal power plants, cement plants, waste in...

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Problems solved by technology

Therefore, in the direction of irradiation, the efficiency of flue gas treatment decreases sharply;

[0007] 2) The flue gas produced by coal-fired boilers must first be sprayed with water to cool down, and the heat has not been effectively utilized; moreover, desulfurization and denitrification are processed synchronously in the same reactor, which cannot achieve optimal reaction and process conditions for both desulfurization and denitrification ;

[0008] 3) During the desulfurization and denitrification process using traditional electron beam irradiation, the dioxins produced in the boiler flue gas have not been effectively removed

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