Wet desulphurization wastewater recycling method and apparatus thereof

Abstract

The invention discloses a wet desulphurization wastewater recycling method and an apparatus thereof. Collected desulphurization wastewater from a gypsum dehydration device enters a flocculation reactor and is pretreated, the desulphurization wastewater is neutralized, flocculated, softened and clarified, and sludge is sent to a sludge treatment device and is dehydrated; separated clarified water undergoes two-stage ultrafiltration, nanofiltration and reverse osmosis desalting, and desalted water returns to a desulphurization system or other water systems. Desalted concentrated water is a high concentrate salt (NaCl) solution, and the high concentrate salt (NaCl) solution goes through a sodium hypochlorite generator to directly electrolyze salt-containing water in order to prepare a sodium hypochlorite solution, and the sodium hypochlorite solution can be used for sterilizing and disinfecting water to realize effective utilization, changing of wastes into valuables and recycling of the desulphurization wastewater, realize complete recycling of the desulphurization wastewater and realize resource recycling. Further, the method has the advantages of no influences on other systems in a power plant, strong practicality, low investment, realization of resource recycling, and wide popularization and use values.

Description

technical field [0001] The invention relates to the technical fields of electric power, metallurgy, chemical industry waste water, resource recycling, energy saving and environmental protection, and in particular to a method and device for recycling wet desulfurization waste water. Background technique [0002] Wet desulfurization is currently the only large-scale commercial desulfurization method in the world, and it is the main technical means to control sulfur dioxide emissions from coal-fired power plants. Limestone-gypsum wet desulfurization is the most widely used flue gas desulfurization method at home and abroad. [0003] The flue gas produced by the boiler enters the wet desulfurization system after being dedusted by the electrostatic precipitator, and is washed and desulfurized in the absorption tower. After the mist is removed by the demister, it is discharged into the atmosphere through the chimney. In the absorption tower, as the flue gas is washed continuously...

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Problems solved by technology

For example, the wastewater treatment system of Heyuan Power Plant in Guangdong pioneered the desulfurization wastewater treatment technology in China. It is the first power plant in my country to adopt the "pretreatment + evaporation + crystallization" process of desulfurization wastewater. The desulfurization wastewater treatment capacity is about 20t / h, and the investment is about ~ 8000 10,000 yuan, but this method has the disadvantages of high investment cost, operating cost, and high energy consumption, and this technology has not been widely promoted

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