Multi-stage absorbing desulfurizing device by adopting ammonia-ammonium sulfate method

Abstract

The invention discloses a multi-stage absorbing desulfurizing device by adopting an ammonia-ammonium sulfate method. The absorbing desulfurizing device comprises a flue gas desulfurizing absorption tower, an absorption liquid circulating tank, a thin slurry circulating tank and a wet-type electric dust remover, wherein the flue gas desulfurizing absorption tower comprises a concentrated slurry circulating tank, a concentration pre-absorption section, an absorption section, a thin slurry washing section and a defogging section that are arranged in a vertical manner; the concentration pre-absorption section comprises at least a layer of concentrated slurry spraying layer; the absorption section comprises an absorption liquid cyclone defogging liquid collector and at least a layer of absorption liquid spraying layer; the thin slurry washing section comprises a thin slurry cyclone defogging liquid collector and a thin slurry spraying layer; the defogging section comprises a defogger and a defogger washing spraying layer. According to the multi-stage absorbing desulfurizing device by adopting the ammonia-ammonium sulfate method, provided by the invention, flue gas cooling, multi-stage defogging absorption and multi-section oxidization are completed in the desulfurizing absorption tower, the utilization rate of ammonia is increased by regulating the ammonia adding positions, and the problems that the concentration of slurry in multiple sections is controlled unsatisfactorily, and the content of aerosol in flue gas after desulfurization is too high are solved, wherein the problems are caused due to the fact that although the conventional desulfurizing absorption tower is divided into multiple sections, slurry in the multiple sections are carried with gases heavily.

Description

technical field [0001] The invention relates to a desulfurization device, in particular to a hierarchical absorption desulfurization device of an ammonia-ammonium sulfate method, and is a flue gas desulfurization device suitable for the ammonia-ammonium sulfate method. Background technique [0002] Ammonia-ammonium sulfate method flue gas desulfurization technology is a mainstream desulfurization process in the chemical industry, which effectively solves the problem of waste ammonia water (with a concentration of about 5%) in the enterprise, and is used to produce ammonium sulfate, realizing "treatment with waste". Waste, comprehensive utilization". [0003] The current ammonia-ammonium sulfate desulfurization technology has the following shortcomings in engineering application: [0004] 1) The utilization rate of ammonia is not high, and the escape of ammonia is high. [0005] The ammonia consumption of currently operating ammonia-ammonium sulfate desulfurization devices ...

AI Technical Summary

Problems solved by technology

[0005] The ammonia consumption of currently operating ammonia-ammonium sulfate desulfurization devices is generally about 1.05 to 1.15 times the theoretical calculation. Considering that a 240t / h boiler burns coal with 1% sulfur content (the annual operating time is 8000 hours), The annual desulfurization agent (ammonia water) dosage in the desulfurization device is higher than the theoretical value, and the increased operating cost is about 700,000 yuan; at the same time, the excessive dosage of desulfurization agent (ammonia water) increases the generation of aerosols

[0006] 2) The smoke aerosol content is high, and the smoke plume is seriously tailed

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