Method and device for desulfurizing and denitrating flue gas based on cryogenic liquefaction and separation

Abstract

The invention relates to a method and a device for desulfurizing and denitrating flue gas based on cryogenic liquefaction and separation. According to the method and the device, the flue gas is desulfurized and denitrated at ultralow temperature by mainly depending on a cryogenic air liquefaction technology; the waste heat of the flue gas is recycled simultaneously; CO2 in the flue gas is collected; the purpose of efficiently desulfurizing and denitrating the flue gas by inputting a small amount of high-quality energy is achieved; chemical by-products can also be obtained; the waste heat is recycled; the purposes of changing waste into wealth and treating pollutants by using pollutants are achieved; equipment investment is reduced; the operation cost is reduced; the flue gas pollution is treated while certain economic benefit is brought; a high-cost flue gas treatment manner of only investing and bringing no benefit at present is changed. In addition, no catalyst is used; the waste heat, water, sulfides, nitrides and the CO2 in the flue gas are simultaneously subjected to waste reclamation; zero emission is achieved; the energy consumption is low; the equipment size is small; one set of the equipment is capable of simultaneously desulfurizing and denitrating; the automation degree is high; great help is supplied to haze treatment and air pollution treatment.

Description

technical field [0001] The invention relates to the technical field of desulfurization and denitrification of flue gas from thermal power generation, boiler flue gas or kiln flue gas, in particular to a method and device for desulfurization and denitrification of flue gas based on cryogenic liquefaction and separation. Background technique [0002] Flue gas desulfurization and denitrification are the main ways to solve air pollution. The gypsum desulfurization process is the most widely used desulfurization technology in the world. About 90% of the flue gas desulfurization devices used in thermal power plants in Japan, Germany, and the United States use this process. At present, the flue gas of thermal power and industrial boilers in my country mainly adopts the wet desulfurization technology of limestone. This technology consumes a lot of water, so that the chimney of the thermal power plant emits a large amount of white smoke containing water and gypsum dust, and at the sa...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a flue gas desulfurization and denitrification method and device based on cryogenic liquefaction separation, which is different from the conventional low-temperature (100-200°C) flue gas desulfurization and denitrification, to solve the problems of large investment and High energy consumption, easy to cause secondary pollution and other problems

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