System and method for multi-heat source coupling treatment of desulfurization wastewater

Abstract

The invention relates to a system and method for multi-heat source coupling treatment of desulfurization wastewater, and belongs to the field of wastewater treatment of coal-fired power plants. The system comprises three process units including evaporation concentration, medicament neutralization and drying solidification, wherein in the process of evaporation and concentration, low-temperature flue gas of 90-150 DEG C before a desulfurization tower is sucked by a booster fan, and is adopted as a heat source, reduction of evaporation concentration is realized in a spray washing mode, and hot air of 250-350 DEG C is sucked from the outlet of an air preheater during drying and solidification, and is adopted as a drying heat source; and salt-containing slurry is quickly dried through a fluidized bed dryer, the dried dust-containing gas is introduced into a front channel of a dust remover of an original power plant, and solid collection is realized in the dust remover. Two mediums including the low-temperature flue gas before the desulfurization tower and the high-temperature hot air at the outlet of the air preheater are adopted as the heat sources, solidification of the wastewater isachieved through coupling of the high-and-low grade heat sources, and drying solidification of the desulfurization wastewater is achieved with low energy consumption and low cost, so that the problemof discharge of the desulfurization wastewater is solved.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment in coal-fired power plants, in particular to a multi-heat source coupling treatment system and treatment method for desulfurization wastewater. Background technique [0002] With the official implementation of the new environmental protection law on January 1, 2015, and the promulgation of the "Water Pollution Prevention and Control Action Plan" in April 2015, namely the "Water Ten Measures", my country has strengthened the control of water pollution, targeting coal-fired power plants The requirement of zero discharge of wastewater from the whole plant was put forward. At present, the external wastewater discharge of coal-fired power plants mainly includes circulating sewage, finely treated concentrated brine and wet desulfurization wastewater. Among them, wet desulfurization wastewater is the worst kind of water quality, with high salt, high TDS, high chloride ions, high The characte...

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Problems solved by technology

[0008] The purpose of the present invention is to disclose a multi-heat source coupling treatment system and treatment method for desulfurization wastewater, solve the technical problems of high cost, high energy consumption, and few terminal product treatment channels in the existing desulfurization wastewater treatment technology, and utilize low-temperature exhaust smoke from coal-fired power plants Air and high-temperature hot air are two heat sources. Through effective coupling and matching, the desulfurization wastewater is dried with low energy consumption, and comprehensive utilization is realized. At the same time, the problem of terminal treatment is solved.

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