Flue gas desulfurization wastewater treatment process for coal-fired boiler

Abstract

The invention discloses a flue gas desulfurization wastewater treatment process for a coal-fired boiler. The process comprises the steps of:mixing and collecting the overflow obtained by treating desulfurization wastewater with a hydrocyclone and an underflow filtration squeezing filtrate in a wastewater buffer tank, and introducing the mixture to a flocculation reactor to complete a dosing and flocculation reaction process; precipitating the wastewater after flocculation reaction into a clarification concentration tank for a period of time, and using a supernatant as desulfurization process water or sending the supernatant into a factory public drainage system; dewatering the sludge at the bottom of the clarification concentration tank, introducing the dewatering liquid into a waste water buffer tank or returning to a water inlet pipe of the clarification concentration tank, and treating the dewatering solid residue and solid residue from underflow dewatering by hydrocyclone. The outlet water quality from the process meets the requirements of DL / T997-2006 standard. The process only needs to add a solid powder treatment agent, and doesn't need drug dissolution preparation; the pH value of the outlet water doesn't need to be adjusted; and the process has the advantages of simple process flow, less equipment investment, simple control system, and great improvement on the operation stability of the desulfurization wastewater treatment system.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a coal-fired boiler flue gas desulfurization wastewater treatment process. Background technique [0002] With the intensification of China's thermal power construction and the improvement of environmental protection requirements, the control of flue gas desulfurization of coal-fired boilers in thermal power plants is also more thorough. The wet flue gas desulfurization technology is mature, with high desulfurization efficiency, good adaptability to coal types, and reliable operation. Therefore, the limestone-gypsum wet flue gas desulfurization process is widely used in thermal power plants. [0003] In the limestone-gypsum wet flue gas desulfurization system, the coal-fired flue gas contains a small amount of F from raw coal - and Cl - , is washed down after entering the desulfurization absorption tower and enters the absorption tower slurry, F - Combined with the a...

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Problems solved by technology

[0015] In order to solve the problems existing in the prior art, the present invention provides a coal-fired boiler flue gas desulfurization wastewater treatment process, which overcomes the problems of long desulfurization wastewater treatment process flow, many treatment equipment and high operating costs in the prior art

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