Low-water-consumption wet desulphurization system and method thereof

Abstract

The invention discloses a low-water-consumption wet desulphurization system and method. The system comprises a desulphurization tower, a desulphurization pump, a gypsum pump, a cyclone, a dehydrator, a filtrate tank, a filtrate pump, a sedimentation tank, a clear liquid tank, a clear liquid pump, a process water tank and a process water pump, wherein a slurry pool, a desulfurization spraying layer, a flue gas heat collector, a condensation spraying layer and a demister layer are sequentially arranged in the desulfurization tower from bottom to top, and a slurry heat collector is arranged in the slurry pool; wherein the gypsum pump, the cyclone, the dehydrator, the filtrate tank, the filtrate pump, the sedimentation tank and the clear liquid tank are sequentially communicated, and the clear liquid pump is communicated with the clear liquid tank and the condensation spraying layer. The filtrate obtained after gypsum dehydration is treated and then recycled for water replenishing of the desulfurization tower and is matched with step-by-step cooling in the desulfurization tower, so that the water consumption of the desulfurization system is reduced from two aspects of reducing the evaporation capacity of the system and improving the cyclic utilization rate of wastewater, and the water consumption of the wet desulfurization system is remarkably reduced.

Description

technical field [0001] The invention relates to the fields of energy saving and environmental protection, in particular to a low water consumption wet desulfurization system and method. Background technique [0002] Due to the advantages of reliable operation, high purification efficiency, and strong adaptability to flue gas fluctuations, the wet desulfurization process has been widely used in flue gas purification fields such as coal-fired power stations, industrial boilers, and kilns. At present, the commissioning rate of coal-fired power plants and industrial boiler wet desulfurization devices exceeds 90%, which has played an important role in the control of industrial coal-fired flue gas pollutant emissions. At the same time, a large number of wet desulfurization devices also have problems such as low energy utilization rate and serious secondary pollution during operation, as follows: [0003] (1) Wet desulfurization devices emit a large amount of low-grade waste heat ...

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Problems solved by technology

[0005] (3) The discharge of high-salt wastewater is large: In order to ensure the desulfurization efficiency and the service life of the desulfurization equipment, it is necessary to discharge high-salt wastewater to the outside of the system on a regular basis. The wastewater discharge of a 300MW unit wet desulfurization device is about 15m 3 / h, the annual emission is as high as 120,000 m 3 , while the current zero-discharge treatment cost of desulfurization wastewater is about 100 yuan / m 3

The cost of desulfurization wastewater treatment remains high

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