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Method for enriching and stabilizing mercury in coal-fired flue gas by using blast furnace slag modified desulfurizer

A technology for blast furnace slag and coal-fired flue gas, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of neglecting mercury volatility, etc., and achieve the effects of increasing mercury capture, reducing volatilization escape, and low cost

Active Publication Date: 2018-06-15
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previous studies mainly focused on the toxicity of mercury leaching from waste, but ignored the volatility of mercury

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In this embodiment, a method for enriching and stabilizing mercury in coal-fired flue gas by utilizing a desulfurizer improved by blast furnace slag includes the following steps:

[0016] a. Use lime-limestone slurry as FGD desulfurizer, use blast furnace slag as modifier, and mix blast furnace slag and lime-limestone slurry according to the mass ratio of blast furnace slag and dry-based FGD desulfurizer at a ratio of 1:2 to form iron Manganese oxide-FGD desulfurizer mixture system, the mass percentage of CaO in the blast furnace slag used is 35%, the mass percentage of iron oxide / ferrous oxide is 0.2%, and the mass percentage of manganese oxide is 0.1 %;

[0017] b. The desulfurization-mercury capture composite slurry prepared in the step a is used for desulfurization of coal-fired flue gas, and for the enrichment and absorption of mercury in coal-fired flue gas.

[0018] In this embodiment, blast furnace slag is added to lime-limestone slurry, and CaO in blast furnac...

Embodiment 2

[0042] This embodiment is basically the same as Embodiment 1, especially in that:

[0043] In this embodiment, a method for enriching and stabilizing mercury in coal-fired flue gas by utilizing a desulfurizer improved by blast furnace slag includes the following steps:

[0044] a. Use lime-limestone slurry as FGD desulfurizer, use blast furnace slag as modifier, and mix blast furnace slag and lime-limestone slurry according to the mass ratio of blast furnace slag and dry-based FGD desulfurizer at a ratio of 1:3 to form iron Manganese oxide-FGD desulfurizer mixture system, the mass percentage of CaO in the blast furnace slag used is 50%, the mass percentage of iron oxide / ferrous oxide is 1.6%, and the mass percentage of manganese oxide is 0.7% %;

[0045] b. The desulfurization-mercury capture composite slurry prepared in the step a is used for desulfurization of coal-fired flue gas, and for the enrichment and absorption of mercury in coal-fired flue gas.

[0046] In the abov...

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PUM

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Abstract

The invention discloses a method for enriching and stabilizing mercury in coal-fired flue gas by using a blast furnace slag modified desulfurizer. The method comprises the following steps: using an FGD desulfurizer slurry, using blast furnace slag as a modifier, and mixing the blast furnace slag and the desulfurizer slurry according to a mass ratio of the blast furnace slag to a dry desulfurizer of 1 to 2-3 to form iron manganese oxide-desulfurizer mixture system so as to prepare a desulfurizing-mercury capturing composite slurry; then using the desulfurizing-mercury capturing composite slurryfor desulfurizing the coal-fired flue gas and enriching and absorbing the mercury in the coal-fired flue gas. According to the method, the blast furnace slag and the desulfurizer are mixed to preparethe desulfurizer slurry for desulfurizing flue gas in a coal-fired power plant; toxicity leaching and volatilization testing are performed on the mercury in an obtained desulfurization material, themercury in the obtained desulfurization material is more stable than ordinary desulfurization gypsum, the concentration of the leached mercury is lowered, the volatile release rate is greatly reduced,and the inhibitory effect on an environmental mercury pollution source is strong. Therefore, the method is of a great significance in atmospheric environmental protection.

Description

technical field [0001] The invention relates to a method for assisting the capture and collection of mercury in coal-burning flue gas, in particular to an enhanced method for capturing and collecting mercury in coal-fired flue gas, which is applied in the technical field of gas emission control environmental engineering. Background technique [0002] Mercury in coal entering the atmosphere after combustion is one of the main sources of mercury pollution in the environment. After coal combustion, mercury enters the subsequent dust removal system and desulfurization system with the flue gas, and the remaining flue gas is discharged into the atmosphere. After the coal is burned, most of the mercury in the coal is trapped in the fly ash in the dust removal system, a part enters the desulfurization gypsum in the desulfurization system, and the remaining part enters the atmosphere with the flue gas. Previous studies mainly focused on the toxicity of mercury leaching from waste, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50B01D53/64
CPCB01D53/502B01D53/64B01D53/80B01D2257/602
Inventor 刘自兴梁冠男郝莹潘赟张佳钱光人
Owner SHANGHAI UNIV
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