Coal-fired power plant desulfurizing wastewater zero-discharge treatment process and equipment

Abstract

The invention discloses a coal-fired power plant desulfurizing wastewater zero-discharge treatment process and equipment. The treatment equipment comprises a wastewater evaporation and concentration unit and a wastewater spray drying unit, the wastewater evaporation and concentration unit comprises a wastewater adjusting tank, a wastewater evaporator and a crystallization and sedimentation tank which are sequentially communicated; the wastewater evaporator is provided with an air inlet for introducing hot air in an indirect cooling tower of the coal-fired power plant as a heat source for evaporation and concentration; the wastewater spray drying unit comprises a spray drying tower; and the spray drying tower is provided with an air inducing pipeline to introduce flue gas as a heat source for spray drying. The method has the advantages of short process flow, low equipment investment, low operation cost and no secondary solid waste treatment problem, and can completely solve the problemof zero discharge of the desulfurizing wastewater of the coal-fired power plant.

Description

technical field [0001] The invention belongs to the technical field of desulfurization wastewater, and in particular relates to a zero-discharge treatment process and equipment for desulfurization wastewater in a coal-fired power plant. Background technique [0002] Coal-fired power plants are the largest industrial water users in my country, and about 40% of industrial water is used in coal-fired power plants. With the promulgation and implementation of the "Water Ten Rules", the new environmental protection law and the water pollution prevention and control law, the sewage discharge standards in various places are becoming more and more stringent. was mentioned. As early as 2006, our country promulgated the "Technical Regulations for Wastewater Treatment Design of Thermal Power Plants", which clearly stated that the desulfurization wastewater treatment facilities of thermal power plants should be set up separately, with priority given to treatment and reuse, no discharge ...

AI Technical Summary

Problems solved by technology

[0004] (1) In order to meet the different water quality requirements of each unit and ensure the stability of equipment operation, the existing technical route requires pretreatment of wastewater and salt separation treatment. The complex treatment process leads to a long overall process flow;

[0005] (2) Due to the long process flow of the existing technology, many processing units are involved, and there are many types of equipment, the overall investment of the equipment is large, and the average processing 1m 3 The investment in equipment for desulfurization wastewater per hour is as high as 2 to 3 million yuan;

[0007] (4) During the softening process of desulfurization wastewater, a large amount of precipitated sludge is produced, and the sludge composition is complex, which is difficult to comprehensively utilize, so it brings about the problem of secondary treatment of sludge and solid waste;

[0008] (5) The by-product crystalline salt in the prior art is usually sodium chloride, sodium sulfate or a mixture of the two, the quality of industrial salt is difficult to guarantee, and crystalline salt with no resource recycling value can only be treated as solid waste or hazardous waste

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