Dehumidification and emission reduction system and process of smoke of coal-fired power plant

Abstract

The invention discloses a dehumidification and emission reduction system of smoke of a coal-fired power plant. The system comprises a high-efficiency electric dust remover, a wet desulfurization device and a dehumidification and emission reduction device that are connected with one another in sequence by a pipeline, wherein the dehumidification and emission reduction device comprises a cylindricalcasing, a tubular heat exchanger, a washing mechanism and a first demister are arranged in the casing; the washing mechanism comprises a water spray pipe and a water distribution pipe; an annular sliding rail is arranged on each of the two sides of the inner wall of the casing; the two ends of the water spray pipe are glidingly connected in the annular sliding rails respectively by sliding blocksof the annular sliding rails, so as to drive the water spray pipe to move; the water distribution pipe is fixedly arranged on the top wall in the casing and communicates with a water inlet formed inthe top of the casing; the water distribution pipe communicates with the water spray pipe by a hose. The system has the advantages that various pollutants such as smoke, SO2 and the like can be effectively removed, the reliability and stability of discharge of the pollutants such as the smoke and the like under certain standard are improved, and good environmental protection benefit and social benefit are achieved.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to a coal-fired power plant flue gas dehumidification and emission reduction system and process. Background technique [0002] At present, the ultra-low emission transformation of coal-fired power plants is advancing in an orderly manner, and coal-fired power plants are achieving ultra-low emissions (NOx<50mg / Nm 3 、SO2<35mg / Nm 3 、Smoke<10mg / Nm 3 At the same time, some areas put forward the requirement to control "big white smoke". The reason is that the ultra-low emission transformation of coal-fired power plants mostly adopts the limestone-gypsum wet flue gas desulfurization technology, and the wet flue gas at the desulfurization outlet still contains a large amount of foggy water vapor , is discharged through the chimney in gaseous form. After the treatment of gypsum rain in the early stage, although the acid-containing water vapor will not fall n...

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Problems solved by technology

[0002] At present, the ultra-low emission transformation of coal-fired power plants is advancing in an orderly manner, and coal-fired power plants are achieving ultra-low emissions (NOx3 、SO23 、Smoke3 At the same time, some areas put forward the requirement to control "big white smoke". The reason is that the ultra-low emission transformation of coal-fired power plants mostly adopts the limestone-gypsum wet flue gas desulfurization technology, and the wet flue gas at the desulfurization outlet still contains a large amount of foggy water vapor , is discharged through the chimney in gaseous form. After the treatment of gypsum rain in the early stage, although the acid-containing water vapor will not fall nearby in the form of liquid droplets (gypsum) rain, the water vapor with relatively high acidity (the pH of condensed water generally reaches 2 ~3), which also contains condensable particles, still produces certain pollution to the atmosphere, and the visual effect of the white plume will also cause public misunderstanding

[0003] Generally, the method to solve the smoke plume is mainly from two aspects. One is to set up the flue gas reheater (GGH) through heating, but it can only solve the visual phenomenon and does not reduce the emission of pollutants. At the same time, practice has proved that the energy consumption of GGH Large and easy to block, has been dismantled in large quantities; the second is to reduce the amount of water in the flue gas by condensation, this method can solve both

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