Regeneration method and regeneration equipment for waste salt produced in flue gas desulfurization

Abstract

The invention relates to treatment of waste salt produced in flue gas desulfurization and discloses a regeneration method and regeneration equipment for waste salt produced in flue gas desulfurization, belonging to the technical field of treatment of coke oven flue gas. The regeneration method for waste salt produced in flue gas desulfurization in the invention comprises the following steps: (1) dissolving waste salt produced in flue gas desulfurization, carrying out flocculation for impurity removal, preparing a sodium sulfate saturated solution from the waste salt produced in flue gas desulfurization, an ammonium bicarbonate solution and a sodium sulfate solid, maintaining a temperature at 36-42 DEG C, and conducting centrifuging to obtain sodium bicarbonate and a mother solution I; (2)decomposing ammonium bicarbonate in the mother solution I through an ammonium bicarbonate tower to obtain ammonia gas, carbon dioxide and sodium sulfate, feeding the ammonia gas and the carbon dioxideinto an ammonium bicarbonate recovery device for generating an ammonium bicarbonate solution, and conducting centrifuging to obtain a sodium sulfate solid and a mother solution II; and (3) producingan ammonium sulfate fertilizer from the mother solution II by using an ammonium sulfate generation system. The regeneration method and the regeneration equipment in the invention can greatly reduce the operation cost of dry desulfurization of flue gas, improve the desulfurization efficiency and increase the utilization rate of sodium bicarbonate, and has important and positive practical significance for optimizing environmental conditions.

Description

technical field [0001] The invention belongs to the technical field of coke oven flue gas treatment, and relates to the treatment of flue gas desulfurization waste salt, in particular to a method and equipment for regenerating flue gas desulfurization waste salt. Background technique [0002] In industrial furnaces, such as coke oven flue gas, coal-fired, gas-fired boiler exhaust gas, electric arc furnace, incinerator and other combustion exhaust gas desulfurization mostly adopts wet, dry and semi-dry desulfurization processes. Due to the high water vapor content and poor diffusion conditions of the flue gas after wet desulfurization and semi-dry desulfurization, condensed water droplets will form when the flue gas leaves the chimney, forming the so-called "chimney rain" and white plume, polluting the environment. The current environmental protection policy Not recommended. Flue gas dry desulfurization is more and more recognized by the industry due to the advantages of low...

AI Technical Summary

Problems solved by technology

Therefore, due to the blank of dry desulfurization waste salt regeneration technology, it not only causes high operating costs in the industry, but also has serious environmental pollution defects.

[0004] In order to solve the above technical problems caused by the inability to process the existing flue gas desulfurization waste salt, the present invention has developed a flue gas desulfurization waste salt regeneration method and equipment

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