Tower-inside saturated crystallization device for controlling particle size of ammonium sulfate by ammonia-process desulfurization device and method

Abstract

The invention discloses a tower-inside saturated crystallization device for controlling particle size of ammonium sulfate by an ammonia-process desulfurization device. The tower-inside saturated crystallization device comprises an absorption tower, an oxidation section, a flue gas inlet, a prewashing section, a crystallization section, an absorption section and a fine particulate matter control section, wherein the oxidation section, the flue gas inlet, the prewashing section, the crystallization section, the absorption section and the fine particulate matter control section are distributed from bottom to top; and a circulating liquid outlet is formed above a partition plate of the crystallization section of the absorption tower and is connected with a prewashing recirculating tank througha pipeline, the prewashing recirculating tank is connected with a spraying layer of the prewashing section of the absorption tower through a prewashing circulating pump and a pipeline, an absorptioncirculating pump is connected with the spraying layer of the prewashing section of the absorption tower through a pipeline, the prewashing recirculating tank is provided with a slurry discharge opening, and the slurry discharge opening is connected with an ammonium sulfate aftertreatment system. The condition that the product ammonium sulfate with the particle size of 0.85mm to 2.8mm accounts for90% or more is controlled through controlling a complemented volume of absorption circulating liquid, a liquid-gas ratio of spraying, coverage of spraying and crystallization retention time; and crystallization running is stable and reliable, the degree of automation is high, and the process is simple.

Description

Technical field: [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a device and a method for controlling saturated crystallization in a tower of an ammonia desulfurization device to control the particle size of ammonium sulfate. Background technique: [0002] At present, the mainstream process for removing sulfur dioxide from gases in the world is the limestone-gypsum method. This method will produce a large amount of wastewater and gypsum slag during the desulfurization process. Every ton of sulfur dioxide removed will simultaneously produce 0.7 tons of carbon dioxide. The treatment of these wastewater and waste residues requires a lot of investment and operating costs. However, ammonia desulfurization does not produce waste water and waste residue, and the input desulfurizer ammonia is converted into ammonium sulfate fertilizer, turning waste into treasure. Usually, the sales revenue of ammonium sulfate fertilizer...

AI Technical Summary

Problems solved by technology

This process needs to set up a cyclone between the crystal growth tank and the washing tower to increase the concentration. The crystallization condition only controls the pH, and it is actually difficult to achieve the ideal crystallization condition.

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