Flue gas emission system and desulfurization device of power plant

Abstract

The invention provides a flue gas emission system of a power plant. The flue gas emission system of the power plant comprises a desulphurization tower, wherein a tubular heat exchanger is arranged atthe top of the desulphurization tower; the tubular heat exchanger is directly communicated with desulphurized wet clean flue gas introduced into the desulphurization tower by virtue of an air inlet bellow; ambient air which is lower than the wet clean flue gas is introduced into a heat exchange pipe of the tubular heat exchanger as a cold medium to cool the wet clean flue gas after being desulphurized by the desulphurization tower; the heat exchanged clean flue gas enters an exhaust passage with a liquid collecting tank; and the liquid collecting tank is used for recovering condensed water andis arranged at a low point of the exhaust passage. The flue gas emission system can not only recover the water resources and waste heat, but also can reduce the occupied area of land, reduce the construction cost, shorten the construction period, reduce the energy consumption and water consumption, and also effectively eliminate'white feather'.

Description

technical field [0001] The invention relates to a coal-fired boiler system of a power plant, in particular to a flue gas discharge system and a desulfurization device of a power plant. Background technique [0002] At present, after wet desulfurization of most coal-fired boilers, the net flue gas of about 45-60°C is directly or indirectly (heated to 75-85°C) discharged through the chimney, causing a large amount of water vapor to enter the atmosphere, which wastes water resources and also wastes water. A "white feather" phenomenon appears at the chimney outlet. As the country has higher and stricter requirements on the environmental discharge and comprehensive utilization of water resources of coal-fired boiler units in thermal power plants, it is becoming more and more important to save energy and water and eliminate "white feathers". [0003] The "white feather" of flue gas is caused by the condensation of water vapor in the flue gas discharged into the atmosphere, and th...

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Problems solved by technology

[0002] At present, after wet desulfurization of most coal-fired boilers, the net flue gas of about 45-60°C is directly or indirectly (heated to 75-85°C) discharged through the chimney, causing a large amount of water vapor to enter the atmosphere, which wastes water resources and also wastes water. "White feather" phenomenon appears at the chimney outlet

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