Power station boiler waste heat utilization and smoke plume elimination system and working method thereof

Abstract

The invention discloses a power station boiler waste heat utilization and smoke plume elimination system and a working method thereof.The smoke input end of a sensible heat exchanger is used for being connected with a smoke outlet of a power station boiler, the smoke output end of the sensible heat exchanger is connected with the smoke input end of a desulfurizing tower, and the smoke output end of the desulfurizing tower is connected with the smoke input end of a latent heat exchanger; the flue gas output end of the latent heat exchanger is connected with the flue gas input end of the flue gas heater, and the flue gas output end of the flue gas heater is connected with the chimney; the heat exchange medium output ends of the sensible heat exchanger and the latent heat exchanger are connected with the heat exchange medium input end of the air preheater, the heat exchange medium output end of the air preheater is connected with the heat exchange medium input ends of the sensible heat exchanger and the latent heat exchanger, and the air output end of the air preheater is connected with the heat input end of the flue gas heater. According to the system, the white smoke plume phenomenon at the chimney opening can be effectively eliminated, and meanwhile heat energy resources of the system can be better utilized.

Description

technical field [0001] The invention belongs to the technical field of coal-fired power station boilers, and in particular relates to a waste heat utilization and smoke plume elimination system of a power station boiler and a working method thereof. Background technique [0002] Coal-fired power plants consume a large amount of coal, oil and water resources, so energy saving and water saving are the consistent pursuit of power plants, and energy recovery is becoming more and more important. The temperature of the flue gas at the flue gas outlet of the power plant boiler is about 130℃-150℃, and there is a certain temperature difference from the dew point of the flue gas. Usually, a sensible heat exchanger is used to recover the heat carried in the flue gas discharged from the flue gas exit of the power plant boiler. , the flue gas is passed into the desulfurization tower for desulfurization and then discharged directly. However, the flue gas after passing through the sensibl...

AI Technical Summary

Problems solved by technology

However, the flue gas still carries some heat after passing through the sensible heat exchanger, and more than 80% of coal-fired units use wet desulfurization technology to remove SO in the flue gas 2 , this will lead to an increase in the water vapor content in the exhausted flue gas, and the direct discharge of wet flue gas into the atmosphere will form a white plume at the chimney mouth. Relevant studies have shown that there is a certain relationship between the white plume and smog, which will cause smog Serious and waste of heat energy resources

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