Desulfurization wastewater zero discharge treatment system and desulfurization wastewater zero discharge treatment process

Abstract

The invention relates to a desulfurization wastewater zero discharge treatment system and a desulfurization wastewater zero discharge treatment process, aiming at solving the technical problems that the existing desulfurization wastewater zero discharge treatment system and desulfurization wastewater zero discharge treatment process are long in process flow, high in investment cost and high in operation and maintenance costs, and cause flue corrosion and safety hazards due to the use of a flue evaporation technology. The system provided by the invention comprises a boiler tail flue system, anda pretreatment system, a concentration reduction system and a high-efficiency tail liquid treatment system which are sequentially connected, wherein the pretreatment system is used for removing calcium and magnesium hardness and solid suspended matters in the desulfurization wastewater; the concentration reduction system is used for carrying out concentration reduction on the pretreated desulfurization wastewater; the high-efficiency tail liquid treatment system is used for carrying out atomization evaporation of the concentrated tail liquid; the system and the method, which are provided by the invention, realize the zero discharge of the desulfurization wastewater by means of the pretreatment system, the concentration reduction system and the tail liquid treatment system which are sequentially connected; the waste heat of the flue gas at the tail of a boiler is utilized to realize the cascade utilization of energy in the treatment process; the system and the process have the advantages of high efficiency and energy conservation.

Description

technical field [0001] The invention belongs to the technical field of desulfurization wastewater treatment, and in particular relates to a zero-discharge treatment system and process for desulfurization wastewater. Background technique [0002] During the operation of the desulfurization device, a large amount of wastewater is regularly discharged, that is, desulfurization wastewater. The wastewater has the characteristics of high concentration of suspended solids, high concentration of inorganic salts and heavy metal ions. The existing desulfurization wastewater treatment process is a traditional three-box process, including neutralization-sedimentation-flocculation and other processes. The treated water quality must meet the national "Sewage Comprehensive Discharge Standard "GB8978-1996 Class I Standard and DL / T997 "Water Quality Control Indicators for Limestone-Gypsum Wet Desulfurization Wastewater in Thermal Power Plants". However, the chlorine ions in the water cannot...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problems of long process flow, high investment cost, high operation and maintenance cost in the existing desulfurization wastewater treatment system, as well as the technical problems of flue corrosion and potential safety hazards caused by flue evaporation technology, and provide a Zero discharge treatment system and process for desulfurization wastewater

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