Device and method for flue gas cyclone jet white removal coupling absorption heat pump waste heat recovery

Abstract

The invention belongs to the technical field of environmental protection, and particularly relates to a device and method for flue gas cyclone jet white removal coupling absorption heat pump waste heat recovery. The device comprises a desulfurization tower, a fan, a cyclone jet, an alkali liquor tank, a liquid collecting tank, a water storage tank, an absorption heat pump and a driving heat source. According to the device and method, flue gas white removal and low-temperature waste heat recovery are coupled, so that the exhaust gas temperature can be reduced, saturated water vapor and solublesalt are condensed and separated out, and the content of the water vapor and the soluble salt in the exhausted flue gas is reduced; the cyclone jet cuts and atomizes liquid into small liquid drops, sothat the heat transfer and mass transfer coefficients of the flue gas and the liquid drops are increased; the liquid drops absorb the heat of the flue gas to become low-temperature heat source water,the low-temperature heat source water flows into the absorption heat pump to release heat and be cooled to become cooling water, one part of the cooling water is used for supplementing water for desulfurization slurry, the other part of the cooling water enters the cyclone jet to be sprayed and atomized and then absorbs the heat of the flue gas, and the process is circulated. The device is smallin occupied area, low in investment cost, free of moving components, easy and convenient to maintain and suitable for existing unit transformation.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a device and method for recovering waste heat of a flue gas swirl jet dewhitening coupled absorption heat pump. Background technique [0002] In order to control smog, the national environmental protection standards have been continuously improved, and ultra-low transformation has been implemented. At present, 93% of ultra-low emission units adopt wet desulfurization, and the flue gas after wet desulfurization is 45-55 ℃, and the water vapor is saturated; The flue gas is exhausted into the atmosphere, and the temperature of the flue gas is further reduced to the ambient temperature. After the water vapor is supersaturated, it condenses and precipitates, forming a "white smoke" phenomenon. White smoke adsorbs SO in flue gas X and NO X After being acidic, it falls to the ground and forms acid rain or gypsum rain; the "white plume" floating in the atmo...

AI Technical Summary

Problems solved by technology

However, GGH is prone to leakage, blockage, high operation and maintenance costs, and often causes problems such as unit tripping. Therefore, many manufacturers who have installed GGH finally choose to directly empty the flue gas. Although MGGH can solve the problem of flue gas leakage and blockage And other issues

Flue gas heating only heats the flue gas, visually eliminates the white smoke phenomenon, but does not remove white smoke and decontamination; (2) Use the cooling tower to condense and cool the flue gas, and introduce the desulfurized flue gas into the circulating water cooling tower, and the flue gas passes through The cooling tower is sprayed and cooled, and discharged after mixing. The water has a certain washing effect on the flue gas, but the heat and mass transfer coefficient is low, which can only reduce pollutant emissions to a certain extent. The consumption of spray water is large, and the residual heat of the flue gas Not fully utilized; (3) High-efficiency defogging technology, adding an impact plate on the top of the desulfurization tower so that the small droplets after desulfurization can be efficiently captured due to impact, which can only partially eliminate the white smoke phenomenon, and there is no real desulfurization

[0004] The technologies currently on the market either only eliminate white smoke visually, but cannot achieve whitening in the true sense, or the whitening efficiency is low, and the low-temperature waste heat cannot be recycled, resulting in a large amount of waste of low-temperature waste heat

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