Method and device of high-effective flue gas demercuration for coal-fired power plant

A coal-fired power plant, high-efficiency technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of mercury saturation, increase the mercury removal capacity of wet desulfurization system, etc., achieve burden reduction and high promotion and application value , The effect of low installation cost

Inactive Publication Date: 2016-01-13
天海能源科技有限公司
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Problems solved by technology

The invention fundamentally solves the problem of mercury saturation in the slurry, and can continuously increase the mercury removal capacity of the wet desulfurization system

Method used

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  • Method and device of high-effective flue gas demercuration for coal-fired power plant

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Embodiment Construction

[0025] Working principle of the present invention:

[0026] Under the synergistic removal of existing environmental protection facilities, flue gas mercury can reach a lower emission level, and the general flue gas mercury concentration can be reduced to 0.015-0.03mg / Nm 3 .

[0027] However, through actual tests and research, it is found that unless activated carbon injection technology with high operating costs is used, when the flue gas mercury concentration is reduced to 0.003-0.005mg / Nm 3 , no matter what other measures are taken, the emission value cannot be further reduced. The reason is that, according to Henry's law, under isothermal and pressure conditions, the solubility of a certain gas in a solution is proportional to the equilibrium pressure of the gas on the liquid surface, that is, Pa=Kx,a·Xa. Where Pa is the gas phase partial pressure of the component, Kx,a is the pressure coefficient, and Xa is the concentration of the liquid phase component. It can be seen...

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Abstract

The invention provides a method and a device of high-effective flue gas demercuration for coal-fired power plants, which are suitable for a coal-fired flue gas treatment system having a wet-method desulfurization absorption column. An activated charcoal adsorption reactor is added to a traditional wet-method desulfurization system to reduce the concentration of saturated mercury absorbed by desulfurization slurry, thereby reducing the concentration of mercury in flue gas in liquid phase and further reducing the concentration of mercury in the flue gas. The method includes a step of feeding the desulfurization slurry in the wet-method desulfurization absorption column into the activated charcoal adsorption reactor through a bypass pipeline to perform activated charcoal adsorption treatment, wherein the desulfurization slurry in the activated charcoal adsorption reactor is 0.5-1.0 m / s in flow velocity and 3-5 s in retention time. The device includes the bypass pipeline communicated with the wet-method desulfurization absorption column and the activated charcoal adsorption reactor arranged on the bypass pipeline.

Description

technical field [0001] The invention relates to the technical field of coal-fired flue gas treatment and purification, in particular to a method and device for removing mercury from coal-fired power plant high-efficiency flue gas. Background technique [0002] The Ministry of Environmental Protection of the People's Republic of China promulgated the "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011) in 2011, and proposed a control target of flue gas mercury of 0.03mg / Nm 3 . The standard stipulates that since January 1, 2015, coal-fired boilers will start to implement 0.03mg / Nm 3 emission restrictions. According to the results of the pilot monitoring of flue gas mercury in 16 coal-fired power plants selected by the Ministry of Environmental Protection, most of the coal-fired power plants can meet the emission standards under the condition of normal operation of existing facilities. The reason is that domestic SCR denitrification, electric / bag fi...

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Application Information

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IPC IPC(8): B01D53/02B01D53/78B01D53/50
Inventor 周烨王颖
Owner 天海能源科技有限公司
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