Desulfurization wastewater treatment system and method

Abstract

The invention provides a desulfurization wastewater treatment system. The system comprises a softening pretreatment unit, a membrane salt-separation concentration unit and an electrolytic chlorine-production unit, wherein the softening pretreatment unit is used to remove hardness, solid suspended matters and heavy metal ions in a desulfurization wastewater; the membrane salt-separation concentration unit is used to carry out monovalent salt and divalent salt separation and deep concentration separation on the wastewater subjected to the softening pretreatment unit; and the electrolytic chlorine-production unit is used to carry out electrolytic chlorine production on the concentrated wastewater produced by the membrane salt-concentration unit. The system can further comprise a hydrogen purification and recovery unit, and the hydrogen purification and recovery unit comprises a chlorine removal apparatus, a water removal apparatus, a deoxidization apparatus and a pressure-swing temperature-changing adsorption apparatus, high purity hydrogen gas is generated and transported to a hydrogen cooling system of an electric generator. On the basis of realizing zero discharge, products of eachlink are rationally treated and recycled according to the technical scheme of the system, the wastewater treatment efficiency is improved, the resource cost is reduced, and the purpose of resource comprehensive utilization of the desulfurization wastewater is achieved.

Description

technical field [0001] The invention belongs to the technical field of desulfurization wastewater, and in particular relates to a desulfurization wastewater treatment system and method. Background technique [0002] Limestone-gypsum wet desulfurization is currently the mainstream process for flue gas desulfurization in coal-fired power plants. However, during the operation of the desulfurization device, in order to ensure the desulfurization performance and maintain the balance of chloride ions, it is necessary to continuously replenish fresh slurry, and at the same time discharge wastewater regularly, which is desulfurization wastewater. [0003] The water quality of desulfurization wastewater is weakly acidic, and the pH value is generally between 5.0 and 6.5. It has the characteristics of high salt content, high turbidity, high hardness, easy scaling and easy corrosion. Desulfurization wastewater contains a large amount of suspended solids and Cl - , Ca 2+ , Mg 2+ , S...

AI Technical Summary

Problems solved by technology

At present, most thermal power plants have self-built hydrogen refueling stations, and use the method of electrolyzing water to produce hydrogen to produce hydrogen, which consumes high resource costs.

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