System and method for recycling flue gas waste heat and water while white fog of coal-fired power station chimney is eliminated

Abstract

The invention provides a system and method for recycling flue gas waste heat and water while white fog of a coal-fired power station chimney is eliminated. The system comprises an absorber absorbing water vapor in flue gas through a salt solution, a solution reproducer, a corresponding heat recycling system and an integrated system for flue gas heat recycling before wet desulphurization. By means of the system and method, white fog of the wet desulphurization coal-fired power station chimney can be eliminated, especially, white fog in winter is eliminated, waste heat and water of flue gas can be recycled, the energy utilizing efficiency of a power station is improved, and consumed water of the power station is reduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection technology for coal-fired power stations, in particular to a system and method for eliminating white fog in chimneys of coal-fired power stations and recovering flue gas waste heat and water in the flue gas. Background technique [0002] Most of the flue gas desulfurization of coal-fired power stations in my country adopts wet desulfurization process. The flue gas at the outlet of wet desulfurization is generally saturated wet flue gas. When this saturated wet flue gas is discharged into the atmosphere from the chimney, the water vapor in the flue gas When it condenses, a large amount of water mist is formed, which is the chimney white mist we see. At the same time, since the flue gas contains a certain amount of NOx, SO 2 , SO 3 Such substances, wet flue gas can also cause corrosion of the chimney. As my country's environmental protection standards become more and more stringen...

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Problems solved by technology

The GGH method is basically not used now due to problems such as leakage, corrosion, and blockage, and most of the power plants that implemented GGH in the past have been demolished or are about to be demolished

MGGH is currently the main choice to achieve flue gas overheating, but this technology also faces many problems to be solved, including: 1) MGGH has a large investment, and it only has environmental protection benefits and cannot achieve energy saving. It uses the flue gas before wet desulfurization To achieve flue gas overheating, the heat of this part of the flue gas cannot be used in the low-temperature economizer, which indirectly reduces the efficiency of the power station; 2) Limited by the acid dew point temperature, the degree of superheating of the flue gas by MGGH is limited, generally at 30 ℃, in winter, especially in the north, it is still difficult to eliminate the white fog

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