Adding method of composite gypsum crystallization promoter for improving crystallization quality of desulfurization slurry

Abstract

The invention belongs to the technical field of flue gas desulfurization of thermal power plants, and relates to a composite gypsum crystallization promoter for improving the crystallization quality of desulfurization slurry and an adding method. Through the added composite gypsum crystallization promoter, the absorption process of sulfur dioxide, the dissolution process of limestone, the oxidation process of sulfites and the crystallization process of gypsum are carried out; gypsum particle size in the tower is increased, desulfurization slurry quality is improved, and operating parameters and water quality characteristics in the absorption tower are improved; and gypsum crystallization in the absorption tower is effectively improved. The invention provides the adding opportunity and adding position of the gypsum crystallization promoter. The implementation effect of the composite gypsum crystallization accelerator is ensured, and the quality of slurry in the tower is ensured to be improved with high efficiency and low cost; and normal operation of a desulfurization system is guaranteed, zero emission of wastewater of the whole plant meets the requirement, and the environment is protected.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization in thermal power plants, and in particular relates to a composite gypsum crystallization accelerator and an adding method for improving the crystallization quality of desulfurization slurry. Background technique [0002] Under the background of the implementation of zero discharge of waste water in the thermal power plant, the high-salt and high-chlorinated waste water of the whole plant is finally collected into the wet desulfurization tower. The crystallization process leads to difficult crystallization of gypsum in the absorption tower, small gypsum crystal grains, difficulty in separating gypsum particles on the cyclone, difficulty in dehydrating gypsum on the dehydrator, and degraded slurry quality in the desulfurization system tower, which seriously affects the normal operation of the desulfurization system, and even causes the unit to shut down . [0003] Chinese patent 20...

AI Technical Summary

Problems solved by technology

[0002] Under the background of the implementation of zero discharge of waste water in the thermal power plant, the high-salt and high-chlorinated waste water of the whole plant is finally collected into the wet desulfurization tower. The crystallization process leads to difficulty in crystallization of gypsum in the absorption tower, small gypsum crystal grains, difficulty in separating gypsum particles on the cyclone, difficulty in dehydrating gypsum on the dehydrator, and a decline in the quality of the slurry in the desulfurization system tower, which seriously affects the normal operation of the desulfurization system and even causes the unit to shut down