Device and method for realizing zero emission of desulfurization wastewater by utilizing flue gas waste heat

A technology for desulfurization waste water and flue gas waste heat, which is applied in gaseous discharge waste water treatment, chemical instruments and methods, multi-stage water treatment, etc., and can solve problems such as large energy consumption of boilers

Pending Publication Date: 2020-10-20
DATANG ENVIRONMENT IND GRP +1
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Problems solved by technology

[0006] The present invention proposes a device and method for realizing zero discharge of desulfurization wastewater by using waste heat of flue gas, which solves the problem of large boiler energy consumption in the prior art

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  • Device and method for realizing zero emission of desulfurization wastewater by utilizing flue gas waste heat

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Embodiment Construction

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0047] Such as figure 1 As shown, in this embodiment, a device for realizing zero discharge of desulfurization wastewater by using waste heat of flue gas is provided, including SCR denitrification reactor 2, air preheater 3, first dust collector 5, wet desulfurization device 7 and drying tower 4.

[0048] Boiler 1, SCR denitrification reactor 2, air preheater 3, first dust collector 5 and wet desulfurization device 7 are connected in sequence through the flue.

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Abstract

The invention discloses a device and a method for realizing zero emission of desulfurization wastewater by utilizing flue gas waste heat. The system comprises a boiler, an SCR denitration reactor, anair preheater, a first dust remover and a wet desulfurization device, which are sequentially connected through a flue. The outlet flue of the SCR denitration reactor and the outlet flue of the air preheater are communicated with the inlet flue of a drying tower through bypass flues; a wastewater evaporation and concentration device is arranged between the first dust remover and the wet desulfurization device, and the wet desulfurization device is connected with a gypsum dehydration device. Medium-temperature flue gas between the first dust remover and the wet desulfurization device is used forcarrying out a concentration and reduction treatment on desulfurization wastewater, the amount of wastewater entering the drying tower is reduced, the extraction amount of hot flue gas can be reduced, and the influence of the system on the boiler efficiency is effectively reduced. Meanwhile, the flue gas behind the SCR denitration reactor and the air preheater is pumped to evaporate the wastewater, and the energy efficiency of the system can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of zero discharge of thermal power desulfurization waste water, in particular to a device and method for realizing zero discharge of desulfurization waste water by using waste heat of flue gas. Background technique [0002] In the "Water Pollution Prevention and Control Action Plan" officially released in April 2015, namely the "Water Ten Measures", it is clearly stated that desulfurization wastewater from thermal power plants is highly polluting wastewater and must be strictly controlled. Desulfurization wastewater has complex components and is extremely difficult to treat. How to treat desulfurization wastewater well and achieve zero discharge of desulfurization wastewater has become an important problem to be solved in coal-fired power plants. [0003] Desulfurization wastewater has high pollutant content and large fluctuations in water quality. It contains a large amount of inorganic salt ions and heavy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/12C02F1/16C02F103/18
CPCC02F1/12C02F1/16C02F2103/18C02F2301/08
Inventor 陈海杰李飞谷小兵白玉勇李雯陈武杨林军
Owner DATANG ENVIRONMENT IND GRP
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