Coal-fired boiler flue gas whiteness-removing system with low energy consumption

Abstract

The invention discloses a coal-fired boiler flue gas whiteness-removing system with low energy consumption. The flue gas whiteness-removing system comprises a boiler water-supply preheater, a sprayingand condensing system, a duster, a desulfurization tower, a flue gas heater and a chimney. The spraying and condensing system comprises a spraying tower, a spraying water cooler, a dosing device, theduster, and a defogger; a spraying device is arranged in the middle of the spraying tower; the spraying device is communicated with the bottom of the spraying tower through the spraying water cooler;the dosing device is communicated with the bottom of the spraying tower; the top of the spraying tower is sequentially provided with the duster and the defogger. Condensed flue gas is heated throughsteam saved or produced to remove whiteness from the flue gas, and a heating source of the flue gas heater is transferred into steam, so that the heat exchanging area of the flue gas heater is reduced, and the temperature of the wall of the flue gas heater is increased to prevent dew point corrosion from appearing on the flue gas heater. Ordinary materials can be used to ensure the long service life of the equipment, used steel materials are reduced, project construction price is lowered, and after heat resources is transferred from low grade to high grade to be utilized.

Description

technical field [0001] The invention relates to the technical field of flue gas de-whitening equipment for coal-fired boilers, in particular to a low-energy-consumption coal-fired boiler flue gas de-whitening system. Background technique [0002] In the coal-fired boiler flue gas emission treatment system, the temperature of the untreated flue gas from the tail of the coal-fired boiler is as high as 130~230°C, and the high-temperature flue gas enters the desulfurization tower after dust removal. Low temperature saturated wet flue gas at 50-55°C, these wet flue gases are directly discharged into the atmosphere through the chimney, due to the temperature drop, part of the gaseous water will soon condense into liquid droplets with the pollutants in the flue gas, and form around the chimney Foggy water vapor. Scattering occurs when exposed to sunlight, forming what is often referred to as a "colored plume". [0003] At present, the flue gas dewhitening technology of coal-fired...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a low-energy coal-fired boiler flue gas dewhitening system, which solves the problem of material corrosion during flue gas condensation, realizes the conversion and utilization of waste heat resources from low-grade to high-grade, and solves the problem of system equipment operation High energy consumption, excessive use of steel and other problems of high project cost

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