Hot air mixed type flue gas white smoke elimination system and elimination method thereof

Abstract

The invention discloses a hot air mixed type flue gas white smoke elimination system and an elimination method thereof. The hot air mixed type flue gas white smoke elimination system comprises a heating unit, a deduster, an absorption tower and a chimney, wherein a flue gas outlet in the upper part of the absorption tower communicates with an inlet of the deduster through a pipeline; an outlet ofthe deduster communicates with the lower part of the chimney through a pure flue gas pipeline; at least two hot air branched pipes are arranged on the pure flue gas pipeline at intervals; the heatingunit comprises an air preheater, a hot secondary air main pipe, a hot secondary air circulating branched pipeline, a hot secondary air circulating fan arranged on the hot secondary air circulating branched pipeline, a heating pipeline, an air exchange heat exchanger and an air exchange fan; the air preheater communicates with the hot secondary air main pipe; and the hot secondary air circulating branched pipeline is arranged on the hot secondary air main pipe. According to the hot air mixed type flue gas white smoke elimination system, structural design is reasonable, clean air is heated to 250 DEG C to 300 DEG C through high-temperature flue gas or high-temperature hot secondary air of which the temperature overpasses 300 DEG C and a gas-gas heat exchanger, heated clean air is sent to thepure flue gas pipeline to be mixed with desulfurated pure flue gas, and pure flue gas is exhausted after being heated to the required temperature.

Description

technical field [0001] The invention relates to the technical field of atmospheric pollutant treatment, in particular to a hot air mixed flue gas white smoke elimination system and an elimination method thereof. Background technique [0002] When the flue gas after boiler combustion is desulfurized, the flue gas enters the absorption tower and directly contacts the slurry liquid film sprayed in the absorption tower. The flue gas is humidified and cooled, and the water in the slurry absorbs heat and vaporizes. The flue gas From the unsaturated state of water vapor content at high temperature to the saturated state after cooling. [0003] The flue gas in a wet-saturated state is discharged into the atmosphere through the chimney, and its temperature is higher than the atmospheric temperature at the chimney outlet. Within a certain distance after the flue gas exits the chimney, it is rapidly cooled by the lower temperature atmosphere, and the water vapor in the flue gas condens...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a hot air mixed flue gas white smoke elimination system and its elimination method, to solve the problems that the wet saturated flue gas discharges polluted air, corrodes the chimney, increases the operating cost of the power plant, and affects industrial production

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