Ammonia-plaster mode desulphurization system

Abstract

The invention relates to an ammonia-plaster mode desulphurization system comprising a desulphurization system and a replacement system, wherein the desulphurization system comprises an ammonia tank car, an ammonia unloading pump, an ammonia storage box, an ammonia distribution pump, an ammonia supply box, an ammonia supply pump, a desulphurization chamber, a boiler, a dust removing device, a draught fan, a flue, a chimney and a spray pump; the replacement system comprises a lime bin, a pulper, a lime slurry pump, a replacement chamber, a Roots blower, an ammonia gas recovery tower, an ammonia pump, a slurry pump, a centrifuger, a liquid collecting tank and industrial water. Flue gas does not need to be cooled before entering a reaction tower, the outlet temperature of an absorption tower is larger than 80 DEG C, the flue gas can be directly discharged into the flue without being heated in order to save energy resources and reduce operation cost, the desulphated water can be recycled after replacement treatment, the ammonia-plaster mode desulphurization system does not discharge waste water; the desulphurization and absorption tower completes absorption reaction in a parallel-flow mode and has short detention time, and compared with the traditional tower device used by other wet desulphurization technologies, the desulphurization of the desulphurization and absorption tower is gas and liquid counterflow reaction. The ammonia-plaster mode desulphurization system has small device size and small floor area and is beneficial to ageing unit improvement, and the additional draught fan does not need to be reformed.

Description

technical field [0001] The invention relates to a desulfurization system, in particular to an ammonia-gypsum desulfurization system. Background technique [0002] Ammonia and gypsum desulfurization technologies are widely used in the field of flue gas desulfurization. Ammonia desulfurization is to use ammonia to absorb sulfuric acid to produce SO2 in flue gas, and to produce ammonium sulfite and ammonium sulfate. The gypsum desulfurization process uses limestone to remove SO2 in the flue gas to produce calcium sulfate. However, in the current market ammonia desulfurization, ammonium bisulfite and ammonium sulfite are directly oxidized and then processed into fertilizers, which reduces their role in desulfurization. , a large amount of available desulfurization resources were wasted, and the waste water from the simple ammonia process cannot be treated; the follow-up investment of the ammonium sulfate process is large, the operating cost is high, and the desulfurization absor...

AI Technical Summary

Problems solved by technology

The gypsum desulfurization process uses limestone to remove SO2 in the flue gas to produce calcium sulfate. However, in the current market ammonia desulfurization, ammonium bisulfite and ammonium sulfite are directly oxidized and then processed into fertilizers, which reduces their role in desulfurization. , a large amount of available desulfurization resources were wasted, and the waste water from the simple ammonia process cannot be treated; the follow-up investment of the ammonium sulfate process is large, the operating cost is high, and the desulfurization absorption liquid is not used sufficiently, and the equipment of the limestone-gypsum process is prone to fouling, blockage, and consumption Large water volume, high operating costs, inability to run continuously, etc.

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