Ammonia desulfurizing process and apparatus with crystallization inside tower

Abstract

The present invention belongs to the field of environment protection apparatus, and is especially crystallizing ammonia type desulfurizing process and apparatus for removing and recovering SO2 from fume. The apparatus includes one desulfurizing tower, one absorbing and circulating tank outside the tower, one concentrating and circulating tank, one ammonium sulfate thickener, one centrifuger and one drier. It features the crystallizing section and oxidizing section set below the fume inlet inside the desulfurizing tower, the connection of the crystallizing section with the concentrating and circulating tank, the connection of the oxidizing section outlet with the absorbing and circulating tank, and the successive connection of the other parts. The present invention has low cost and convenient apparatus maintenance and operation.

Description

technical field [0001] The invention belongs to the technical field of environmental protection equipment, and relates to an in-tower crystalline ammonia desulfurization process and device for removing and recovering sulfur dioxide in flue gas. Background technique [0002] The traditional flue gas desulfurization process mainly adopts calcium desulfurization technology, which has defects such as secondary pollution and difficult disposal of desulfurized gypsum. Compared with the calcium desulfurization process, the existing ammonia desulfurization process uses ammonia to absorb sulfur dioxide in the flue gas, and the reaction is a gas-liquid or gas-gas phase reaction. The reaction speed is fast, the utilization rate of the absorbent is high, and the volume of the absorption equipment is can be greatly reduced. However, when ammonia desulfurization is applied to the desulfurization of coal-fired boiler flue gas, the existing various technologies generally have problems such...

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Problems solved by technology

However, when ammonia desulfurization is applied to the desulfurization of coal-fired boiler flue gas, the existing various technologies generally have problems such as high ammonia consumption, difficulty in eliminating aerosol, high cost of absorbing liquid treatment, and difficult operation.

Usually ammonia flue gas desulfurization uses ammonia to absorb sulfur dioxide to generate ammonium sulfite, and then oxidizes it with air, but high-concentration ammonium sulfite cannot be quickly and completely oxidized into ammonium sulfate, but is oxidized at a lower concentration and then evaporated. The product obtained by the concentration process has a large amount of evaporation, large energy consumption, long process, many equipment, large area occupation, high operating cost, and poor economical efficiency of the device.

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