Desulfurization wastewater treatment process and treatment device thereof

Abstract

The invention discloses a desulfurization wastewater treatment process which comprises the following steps: when hot flue gas generated by a boiler flows through an economizer, high-temperature heat of exhausted flue gas can be absorbed and recycled, and meanwhile, the exhaust gas temperature of the flue gas is reduced; according to the invention, the desulfurization wastewater is conveyed to the wastewater spray evaporator through the wastewater pump, the atomized desulfurization wastewater is sprayed into the flue by adopting the atomizing nozzle, the atomized desulfurization wastewater is quickly evaporated in the flue by utilizing the heat of the flue gas, and impurities in the wastewater enter the dust removal equipment together with fly ash in the form of solid substances along with the flue gas, so that compared with direct flue spray evaporation, bypass spray evaporation can greatly reduce the influence of spray on safe operation of a dust remover; and flue gas waste heat is used for evaporation drying, and desulfurization waste water can be economically and efficiently treated, so that the investment construction cost and the operation cost of a power plant waste water zero discharge system are greatly reduced; and the exhaust gas temperature is reduced through spray, and economic and stable operation of dust removal, a fan and desulfurization equipment is facilitated.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a desulfurization wastewater treatment process and a treatment device thereof. Background technique [0002] In order to maintain the balance of substances in the slurry circulation system of the desulfurization device, prevent the soluble part in the flue gas, that is, the chlorine concentration from exceeding the specified value, and ensure the quality of gypsum, a certain amount of wastewater must be discharged from the system. The desulfurization wastewater mainly refers to the wet desulfurization of boiler flue gas. (Limestone / Gypsum method) During the process, the discharge water from the absorption tower and the flue gas generated by the boiler enter the wet desulfurization system after being dedusted by the dust collector. In the atmosphere, as the flue gas is washed continuously in the absorption tower, the effective components of the absorbent are continuou...

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Problems solved by technology

[0003] Desulfurization wastewater has high salt content, complex composition, corrosiveness, and strong pollution. It must be treated separately before it can be discharged, otherwise it will cause great pollution to the environment. In the existing desulfurization wastewater treatment process, the wastewater will be treated multiple times. evaporation, this process will consume a lot of resources and make the operation cost very high, so we propose a desulfurization wastewater treatment process and its treatment device to solve the above problems

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