System used for white flue gas removal and waste gas recycling

Abstract

The invention discloses a system used for white flue gas removal and waste gas recycling. The system comprises a white flue gas removal device and a waste heat recycling device, wherein the white fluegas removal device comprises a flue gas air flue and a water-cooling type air conditioner heat pump unit; one end of the flue gas air flue is provided with an air outlet, and the other end of the flue gas air flue is provided with an air outlet; the water-cooling type air conditioner heat pump unit comprises at least three heat pump type air conditioners; each heat pump type air conditioner comprises an evaporator arranged in the flue gas air flue, a condenser arranged outside the flue gas air flue, and a refrigerant circulating loop connected between the evaporator and the condenser, whereinthe evaporator is arranged in a spaced mode in a flue gas flowing direction; and the waste heat recycling device comprises a water inlet tube, a water outlet tube and a waste gas recycling pipeline for introducing water in the water inlet tube into each condenser and discharging water flowing out from each condenser into the water outlet tube. The system has the advantages that the white flue gasremoval is achieved, pollutant discharge is reduced, and flue gas waste heat is recycled.

Description

technical field [0001] The invention relates to the technical field of flue gas dewhitening, in particular to a system for flue gas dewhitening and waste heat recovery. Background technique [0002] Since the implementation of green energy-saving industry in my country, waste heat recovery devices will be installed in the exhaust pipes of many coal-fired, gas-fired and oil-fired boilers. There is still a lot of heat in the flue gas at 50°C-70°C that has not been effectively utilized. [0003] Moreover, sulfur dioxide, nitrogen oxides and a large amount of water vapor will be carried in the exhaust smoke of the boiler. In winter, the water vapor in the flue gas meets the cold air and condenses at the chimney outlet, forming a large amount of white smoke, which affects the surrounding residents. If the white smoke phenomenon is not controlled for a long time, it will destroy the surrounding ecological environment. Contents of the invention [0004] The object of the present...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a system for flue gas dewhitening and waste heat recovery, which has the advantages of solving the problem of flue gas dewhitening, reducing pollution emissions, and recycling flue gas waste heat at the same time

[0006] Through the above technical solution, the problem of flue gas dewhitening is solved, pollution emission is reduced, and the waste heat of flue gas is recovered and utilized; when in use, the wet flue gas discharged from the boiler enters the flue gas duct through the air inlet of the flue gas duct , and then pass through each evaporator in turn, and finally discharged from the air outlet of the flue gas duct. When the flue gas passes through each evaporator, the flue gas acts as a heat source to make the refrigerant in the corresponding evaporator absorb heat and evaporate, thereby reducing the temperature of the flue gas , so that most of the water vapor in the flue gas is liquefied into liquid water, and at the same time, the sulfur dioxide and nitrogen oxides in the flue gas will also dissolve into the liquid water, thereby realizing the filtration of sulfur dioxide and nitrogen oxides, and also realizing the removal of flue gas At the same time, under the action of the circulation loop, the high-temperature gaseous condensing agent in the evaporator enters the corresponding condenser, and liquefies in the condenser to release heat, and the heat released by the liquefaction of the condensing agent will be passed into the condensation through the waste heat recovery pipeline. The water in the device is absorbed, and finally discharged through the outlet pipe, so as to realize the heating of water and the waste heat recovery of flue gas

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