System and method for eliminating white wake of flue gas

Abstract

The invention provides a system and a method for eliminating white wake of flue gas. The system comprises energy source supply equipment, a heat pump and a chimney, wherein the energy source supply equipment is used for providing a drive energy source for the heat pump to work. The system has the advantages that by utilizing the characteristic of wet physical property of enthalpy in flue gas changing along with temperature, and utilizing the principle of the heat pump, a small amount of steam and power is consumed for driving the heat pump to circulate; the flue gas is cooled by the drive heatsource and the self heat of the flue gas to reduce the temperature of flue gas and dehumidify; then, the flue gas is heated to increase the temperature of the flue gas, the relative humidity of the flue gas is reduced, and the white wake of the flue gas is effectively eliminated; one part of water steam in the flue gas can be recycled and reutilized, and the fine particulate pollutants and soluble pollutants in the flue gas can be collected along with the condensate of flue gas, so that the flue gas which is exhausted into atmosphere is cleaner; the contribution degree of flue gas to the atmosphere haze pollution is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of energy saving and emission reduction, and in particular relates to a system and method for eliminating white trails of flue gas. Background technique [0002] The flue gas of coal-fired power plants is discharged into the atmosphere through the chimney. Due to reasons such as the background color of the sky, sky lighting, and viewing angles, etc., it is usually white, gray, blue, etc. visually, becoming a "colored plume". With continuous development, the current "colored plume" is mainly "white plume". [0003] Most of the desulfurization systems of coal-fired generating units in my country adopt the limestone-gypsum wet desulfurization process (hereinafter referred to as wet desulfurization), which can reduce the temperature of the flue gas to 45-55 ° C, and these low-temperature saturated wet flue gases enter the atmosphere directly through the chimney environment, when condensed, it condenses into tiny...

AI Technical Summary

Problems solved by technology

In order to eliminate the white smoke trail, some people have invented a system that uses water from rivers and lakes to indirectly cool the flue gas through a heat exchanger or directly spray the flue gas without a heat exchanger, and some people have invented a system that uses steam to indirectly heat the flue gas through a heat exchanger. The system uses high-temperature flue gas to heat the flue gas directly or indirectly through a heat exchanger. However, these methods inevitably consume a large amount of electricity and heat or consume a large amount of water resources, which is not in line with the development direction of energy saving and consumption reduction. These methods invest Large, high operating costs, and it is not feasible in the absence of low-temperature water sources or high-temperature heat sources

Images