A low energy consumption coal-fired boiler flue gas dewhitening system

Abstract

The invention discloses a low-energy consumption coal-fired boiler flue gas dewhitening system, which includes a boiler feed water preheater, a spray condensing system, a dust collector, a desulfurization tower, a flue gas heater and a chimney; the spray condensing system includes a spray tower, Spray water cooler, dosing device, dust collector and demister. There is a sprinkler in the middle of the spray tower. The sprayer communicates with the bottom of the spray tower through the spray water cooler. The dosing device and the spray tower The bottom is connected, and the top of the spray tower is provided with a dust collector and a mist eliminator in turn. The invention utilizes the saved or generated steam to heat the condensed flue gas to realize flue gas dewhitening. This process converts the heating source of the flue gas heater into steam, reduces the heat exchange area of ​​the flue gas heater, and increases the temperature of the pipe wall of the flue gas heater. , to avoid dew point corrosion in the flue gas heater, the use of ordinary materials can also ensure the long-term service life of the equipment, reduce the use of steel, reduce the cost of the project, and realize the conversion and utilization of waste heat resources from low-grade to high-grade.

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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