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A system and method for desulfurization waste water, salt separation, zero discharge and flue gas mercury removal

A desulfurization wastewater and zero-discharge technology, which is applied in separation methods, chemical instruments and methods, and gaseous effluent wastewater treatment, can solve the problems of sulfate waste, mercury removal efficiency decline, and inability to recycle, so as to reduce factory steam Consumption, low cost, and the effect of resource utilization

Active Publication Date: 2021-05-28
XI AN JIAOTONG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, desulfurization wastewater contains more sulfate, which will inhibit the oxidation process of mercury in SCR, resulting in a decrease in mercury removal efficiency.
And the sulfate is sprayed into the flue, which cannot be recycled, resulting in waste of sulfate

Method used

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  • A system and method for desulfurization waste water, salt separation, zero discharge and flue gas mercury removal

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Embodiment Construction

[0024] The present invention is described in further detail below in conjunction with accompanying drawing:

[0025] refer to figure 1 , the desulfurization wastewater desulfurization waste water salt zero discharge cooperative flue gas mercury removal system includes a selective catalytic reduction denitrification device 1, a desulfurization tower 4, a triple box 6, a nanofiltration device 8, a condenser 11, and a sulfate solution preheater 16. A sulfate solution heater 17, a multi-effect distillation system 18 and a sulfate freezing crystallizer 20; the flue gas outlet of the selective catalytic reduction denitrification device 1 is connected with the flue gas inlet of the desulfurization tower 4, and the desulfurization wastewater of the desulfurization tower 4 The outlet is connected with the inlet of the triple box 6, the outlet of the triple box 6 is connected with the inlet of the nanofiltration device 8, and the outlet of the chlorine salt solution of the nanofiltratio...

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Abstract

The invention discloses a desulfurization waste water desalination zero discharge cooperative flue gas mercury removal system and method, including pretreatment and nanofiltration system, chlorine salt solution preheating and flue spraying system, sulfate solution multi-effect distillation system and freezing crystallization system. The nanofiltration device is used to realize the separation of desulfurization waste water salt, the chlorine salt solution is sprayed into the flue near the SCR after being preheated by the condenser to realize synergistic mercury removal; the sulfate solution is concentrated by multi-effect distillation and then frozen and crystallized, and the sulfate preheater recovers the heating steam The residual heat of condensate. The invention can realize zero discharge of desulfurization wastewater, and synergistically improve the efficiency of flue gas mercury removal, and has remarkable environmental protection benefits; the heat pump is used to increase the waste heat level of frozen crystallization to heat the chloride salt solution, and the condensed water is used to preheat the sulfate solution, effectively reducing the concentration energy consumption; The use of chlorine salt solution spraying in desulfurization wastewater to promote efficient demercury removal of flue gas has good economic benefits; the salt content of desulfurization wastewater is recovered through the freezing and crystallization system to realize resource utilization of desulfurization wastewater.

Description

technical field [0001] The invention belongs to the fields of zero discharge of desulfurization wastewater and flue gas mercury removal, and relates to a system and method for desulfurization wastewater with zero discharge of desulfurized salt and coordinated flue gas mercury removal. Background technique [0002] During the operation of coal-fired power plants, a large amount of desulfurization wastewater will be generated. The desulfurization wastewater has a high salt content, and direct discharge will cause environmental pollution. The current mainstream desulfurization wastewater treatment methods have high treatment costs, and it is difficult to separate the salts of different components, resulting in a waste of resources. The use of nanofiltration can effectively separate sulfate and chloride salts in desulfurization wastewater, and realize resource utilization of desulfurization wastewater. However, concentrating the crystalline chlorine salt solution requires a lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/64C02F9/10C02F103/18
CPCB01D53/8665B01D2258/0283C02F1/04C02F1/442C02F2103/18
Inventor 韩小渠陶安宇张丹苏旻琦李逸飞刘继平严俊杰
Owner XI AN JIAOTONG UNIV
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