Integrated treatment method and device for flue gas wet-type phase-change ultraclean dust removal and rime fog removal

Abstract

The invention discloses an integrated treatment method and device for flue gas wet-type phase-change ultraclean dust removal and rime fog removal. The method comprises the following steps of 1, cooling, wherein to-be-treated flue gas is cooled, so that saturated wet flue gas is subjected to phase change and liquefied into liquid drops; 2, liquid drop agglomeration and dust removal, wherein flue gas containing the liquid drops continues to be collided and agglomerated under the function of a rotational flow plate, and formed water drops adsorb flue gas dust in the falling process; 3, rime fog removal, wherein the flue gas treated in step 2 and the gas subjected to rime fog removal are sufficiently mixed before flue gas is discharged, unsaturated flue gas is formed, and then the treated fluegas is directly discharged. By means of the integrated treatment method and device, the purpose of dust removal and rime fog removal of wet-type desulfurized flue gas is effectively achieved, the moisture in the discharged flue gas is recycled while the problem of tailing of visual organs is solved, the water resource is saved, and the purposes of environmental protection, standard reaching, andultralow near-zero discharge are achieved.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to an integrated treatment method for flue gas wet phase change ultra-clean dust removal, fog removal and whitening. Background technique [0002] At present, most of the flue gas exhausted from industrial desulfurization and denitrification devices in my country are equipped with dust removal devices, among which wet desulfurization devices account for about 90% of all desulfurization devices, but the problems existing in wet desulfurization systems are mainly: PM2.5 fine dust, The removal efficiency of aerosol particles is low; the tailing of the exhausted smoke is serious, which seriously affects the environment. At the same time, the exhaustion of water vapor is also one of the factors that cause smog. In addition, in order to eliminate the smearing phenomenon in some processing devices, a flue gas reheater (GGH) is installed at the outer outlet of the chim...

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Problems solved by technology

[0002] At present, most of the flue gas exhausted from industrial desulfurization and denitrification devices in my country are equipped with dust removal devices, among which wet desulfurization devices account for about 90% of all desulfurization devices, but the problems existing in wet desulfurization systems are mainly: PM2.5 fine dust, The removal efficiency of aerosol particles is low; the tailing of the exhausted smoke is serious, which seriously affects the environment. At the same time, the exhaustion of water vapor is also one of the factors that cause smog

In addition, in order to eliminate the smearing phenomenon in some processing devices, a flue gas reheater (GGH) is installed at the outer outlet of the chimney to eliminate whitening. However, the reheater investment, energy consumption and system failure rate are high. When there is no GGH, the "gypsum" near the chimney "Rain" falls, the smoke plume trails for a long distance, and the secondary pollution is serious, resulting in landscape pollution

Ammonia desulfurization is one of the mainstream methods of flue gas desulfurization treatment. When flue gas SO 2 Content over 2000mg / m 3 , the ammonia escape concentration of the process itself is difficult to achieve, and there are widespread ammonia escape and "thick white smoke" emission problems. one of the serious reasons

[0003] At present, wet electrostatic precipitator and tubular dust removal are used for a lot of exhaust gas. Although wet electrostatic precipitator can remove some fine dust and aerosol particles, the trailing phenomenon and landscape pollution of the exhaust gas are still serious. Desulfurization Wet electrostatic precipitators and tube-bundle precipitators are added to the denitrification flue gas, but these technologies can only partially solve the dust removal and mist removal, and have no obvious improvement in the white smoke plume, water mist and rain of the flue gas, and the environmental pollution is still Existence, saturated wet flue gas containing a lot of moisture is one of the important sources of smog

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