Power plant desulfurization wastewater treatment system

Abstract

The invention discloses a power plant desulfurization wastewater treatment system, and belongs to the field of thermal power generation. The power plant desulfurization wastewater treatment system comprises a dry-type slag extractor and a spray pipe, a water inlet end of the spray pipe is connected with a concentration device and a water storage device, the concentration device comprises a tubularmicro-filtration membrane and a vibrating membrane, a plurality of nozzles are arranged on the spray pipe and positioned above the dry-type slag extractor, the water storage device is provided with aheating device, a temperature sensor and / or a humidity sensor is arranged on the head of the dry-type slag extractor, and the concentration degree of the concentration device for desulfurization waste water is adjusted according to the temperature and / or the humidity acquired by the temperature sensor and / or the humidity sensor. According to the system, the desulfurization waste water is concentrated and preheated, so that the desulfurization waste water can be completely consumed, zero emission of the desulfurization waste water is achieved, comprehensive utilization values of slag are improved, and the system overcomes the shortcomings that a secondary treatment device is introduced, cost is high, a power plant needs to be reconstructed, and pollution is generated.

Description

technical field [0001] The invention relates to the field of thermal power generation, in particular to a desulfurization wastewater treatment system for a power plant. Background technique [0002] Coal-fired boilers in thermal power plants at home and abroad mostly adopt wet flue gas desulfurization process. The desulfurization wastewater produced is complex, corrosive, difficult to reuse, and expensive to treat. It has become one of the key factors restricting the realization of "zero discharge" of desulfurization wastewater in power plants. [0003] Chinese patent document CN201520638739 discloses a waste water treatment system for evaporating waste water generated in the pretreatment process of a thermal power plant. On the one hand, the hot slag is cooled while evaporating the waste water, and the evaporated industrial salt is attached to the dry slag in a solid form, which eliminates the strong corrosiveness of the high-concentration wastewater in a liquid form, and ...

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Problems solved by technology

[0004] However, the proportion of water in the desulfurization wastewater is relatively large, and the amount of hot slag produced in the operating boiler is limited. When the amount of hot slag produced by the boiler is normal, the desulfurization wastewater cannot be completely consumed; and the hot slag and desulfurization The output of waste water is not fixed, but changes dynamically with the influence factors such as environment / combustion amount

Therefore, with the above scheme, the desulfurization wastewater cannot be completely consumed, and the industrial salt cannot be attached to the hot slag in a consolidated form. The mixture of the desulfurization wastewater and the hot slag must be treated twice to consolidate the industrial salt. It is not conducive to the comprehensive utilization of bottom slag and affects the value of bottom slag

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