Desulfurization waste water treatment system and process

Abstract

The invention provides a desulfurization waste water treatment system suitable for a coal-fired power plant. The desulfurization waste water treatment system comprises a boiler, an air preheater, a flue, a dust remover, a desulfurization tower, a waste water chemical adding treatment device and a concentration device. Turbid waste water drained by a desulfurization system enters the waste water chemical adding treatment device to be preliminarily treated, and clear water obtained after treatment is conveyed to the concentration device through a clear water pump. Thick-thin separation is carried out in the concentration device, the clear water which is separated out is recycled, thick water is conveyed into the flue in front of the dust remover behind the air preheater of the boiler througha pump, and a spraying device is arranged in the flue to atomize the waste water to evaporate the waste water by waste heat of flue gas; after liquid-state components in the desulfurization waste water are evaporated, remaining solid matter is removed from the dust remover, and steam formed after the liquid-state components in the desulfurization waste water are evaporated enters the desulfurization tower along with the flue gas and then is exhausted by a chimney. Zero release of the desulfurization waste water of the coal-fired power plant can be achieved, the desulfurization waste water isevaporated by fully utilizing the waste heat of the flue gas of the coal-fired power plant, it is not needed to consume other heat sources, and energy saving and emission reduction are achieved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a zero-discharge treatment system and process suitable for desulfurization wastewater in coal-fired power plants. Background technique [0002] my country's sulfur dioxide emission ranks first in the world, and has exceeded 20 million tons for many years. Among them, the emission of sulfur dioxide from coal-fired power plants is close to 50% of the total. Sulfur dioxide is one of the main causes of air pollution and an important cause of acid rain. The characteristics of my country's energy structure determine that the control of coal-fired sulfur dioxide emissions is the focus of my country's control of sulfur dioxide pollution, and the control of sulfur dioxide emissions from coal-fired power plants is the key to controlling coal-fired sulfur dioxide pollution. Gas is a major emitter of sulfur dioxide. [0003] Most power plants in my country use limest...

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Problems solved by technology

[0005] Based on the above prior art, the purpose of the present invention is to provide a zero-discharge treatment system and process suitable for coal-fired power plant desulfurization wastewater to solve the technical problem of incomplete treatment of desulfurization wastewater in coal-fired power plants and the inability to achieve zero discharge.

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