Treatment system and method for flue gas

Abstract

The invention relates to the field of flue gas desulfurization applications, and in particular relates to a treatment system and method for a flue gas. The treatment system comprises a gas-gas heat exchanger, a desulfurization tower equipped with a slurry cooler, a desulfurization slurry cooler and a chimney; in the gas-gas heat exchanger, high-temperature crude smoke before desulfurization treatment is utilized as a heat source to heat low-temperature clean smoke obtained after the desulfurization treatment, and desulfurization slurry is cooled by utilizing the desulfurization slurry heat exchanger. According to the system and method provided by the invention, after temperature of the high-temperature crude smoke is reduced, dust removing efficiency can be effectively improved; after temperature of the desulfurization slurry is reduced, desulfurization efficiency can be effectively improved, loss of the desulfurization slurry can be reduced, and a moisture content of the low-temperature clean smoke can be reduced; and after temperature of the low-temperature clean smoke is improved, white smoke in the flue gas can be effectively eliminated. The system and method provided by the invention effectively eliminate the white smoke in the flue gas while improving the desulfurization efficiency, and reduce investment of a whole desulfurization process system.

Description

technical field [0001] The invention relates to the application field of flue gas desulfurization, in particular to a flue gas treatment system and method. Background technique [0002] With the implementation of the "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13226-2011) promulgated by the Ministry of Environmental Protection, it is required that the soot emission standard for coal-fired boilers should reach 30mg / Nm 3 , SO2 content is controlled at 100mg / m according to the difference between new and existing power plants 3 , 200mg / m 3 , soot and SO2 emissions in key areas will be controlled at 20mg / m in the future 3 , 50mg / m 3 . The increasingly stringent emission standards of air pollutants force coal-fired power plants and other coal-fired boiler enterprises to modify the flue gas emission system to meet the ultra-clean emission requirements. At present, coal-fired boilers generally use limestone-gypsum wet technology for flue gas desulfurizatio...

AI Technical Summary

Problems solved by technology

[0013] Based on the problems existing in the existing flue gas treatment system, a flue gas treatment system and method are provided, which not only solve the common air leakage problem of GGH, but also solve the ubiquitous problems of large equipment volume and high renovation cost of MGGH, and solve the problem of Reduce the sulfur content of flue gas emissions based on the blockage of flue gas heat exchangers, and achieve real energy saving and emission reduction

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