A graded absorption desulfurization device using ammonia-ammonium sulfate method

Abstract

The invention discloses a hierarchical absorption desulfurization device using the ammonia-ammonium sulfate method, which includes a flue gas desulfurization absorption tower, an absorption liquid circulation tank, a slurry circulation tank and a wet electrostatic precipitator; the flue gas desulfurization absorption tower includes a bottom-up The concentrated slurry circulation tank, concentrated pre-absorption section, absorption section, thin slurry water washing section and demister section; the concentrated slurry section includes at least one concentrated slurry spray layer, and the absorption section includes an absorption liquid cyclone mist collector and There is at least one absorbing liquid spray layer. The slurry liquid washing section includes a slurry liquid cyclone demister collector and a slurry liquid spray layer. The demister section includes a demister and a demister flushing spray layer. The present invention completes the processes of flue gas cooling, graded defogging and absorption, and segmented oxidation in the absorption tower. It improves ammonia utilization by adjusting the position of the ammonia adding point, and solves the problem that although the traditional desulfurization absorption tower is segmented, each segment carries serious slurry, resulting in The slurry concentration control in each section is not ideal, and the aerosol content of the net flue gas aerosol is too high.

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

Images