Method suitable for controlling mercury contamination in coal-fired power plants adopting wet-process flue gas desulfurization

A technology of coal-fired power plants and control methods, applied in the field of mercury pollution control, can solve the problems of secondary pollution, re-release, instability, etc., and achieve the effects of short delay, long delay and convenient operation

Inactive Publication Date: 2013-03-27
HUANENG CLEAN ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a coal-fired power plant equipped with a wet flue gas desulfurization system, although the system is expected to obtain higher mercury removal efficiency, the mercury oxide absorbed by the wet flue gas desulfurization system basically exists in the desulfurization slurry and is Unstable, when the operation of the desulfurization system fluctuates or the mercury content in the flue gas is high, the mercury oxide absorbed by the desulfurization slurry is likely to be released again, causing secondary pollution

Method used

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  • Method suitable for controlling mercury contamination in coal-fired power plants adopting wet-process flue gas desulfurization
  • Method suitable for controlling mercury contamination in coal-fired power plants adopting wet-process flue gas desulfurization
  • Method suitable for controlling mercury contamination in coal-fired power plants adopting wet-process flue gas desulfurization

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 As shown, the mercury pollution control method suitable for coal-fired power plants equipped with wet flue gas desulfurization systems, the halide additive liquid storage tank 3 is connected with the coal feeder 2, and the coal feeder 2 is connected with the coal mill 6; The sulfur-containing additive storage tank 17 is connected with the outlet of the fresh slurry pipeline 14 and the circulating pump 16 . The method for realizing mercury pollution control is as follows: calcium bromide is selected as the halide additive, and after being prepared into a uniform solution of 4mol / L, it is added to the coal feeder 2, and then brought into the boiler body through the coal mill 4 Participate in combustion to promote the oxidation of mercury in the flue gas; the sulfur-containing additive used is selected from sodium hydrosulfide, and after being formulated into a uniform solution of 0.1mol / L, it is added to the fresh slurry pipeline 14 and the circulation pu...

Embodiment 2

[0040] Such as figure 2 As shown, the mercury pollution control method is suitable for a coal-fired power plant equipped with a wet flue gas desulfurization system, and the sulfur-containing additive liquid storage tank 17 is connected to the inlet of the circulation pump 16 . The method for realizing mercury pollution control is as follows: the sulfur-containing additive used is selected from sodium sulfide, and after being formulated into a uniform solution of 0.2mol / L, it is added to the inlet of the circulation pump 16, so as to be compatible with the circulating slurry and the flue gas. The mercury oxide reacts to form stable mercury sulfide precipitation, thereby ensuring the effective removal of mercury oxide and making the mercury content in the flue gas in the chimney 18 meet the emission requirements. The ratio of the amount of sodium sulfide added to the amount of standard flue gas is 1×10 -5 g / Nm 3 .

[0041] In this example, by adding sodium sulfide additive i...

Embodiment 3

[0043] Such as image 3 As shown, the mercury pollution control method is suitable for coal-fired power plants equipped with wet flue gas desulfurization systems. Connection; the sulfur-containing additive liquid storage tank 17 is connected with the outlet of the fresh slurry pipeline 14, the desulfurization waste liquid pipeline 15 and the circulating pump 16. The method for realizing mercury pollution control is as follows: the halide additive used is a mixed solution of calcium bromide and calcium chloride, the concentration of calcium bromide is 3mol / L, and the concentration of calcium chloride is 5mol / L. The liquid tank 3 is added to the primary air hot air pipeline 7, and the primary air is brought into the boiler body 4 to participate in combustion, which promotes the oxidation of mercury in the flue gas; the sulfur-containing additive used is selected from organic sulfur (TMT15), and is formulated to be 0.05 mol / L uniform solution, it is added to the fresh slurry pip...

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Abstract

The invention discloses a method suitable for controlling mercury contamination in coal-fired power plants adopting wet-process flue gas desulfurization. The method is characterized in that halide additive solution is added into a boiler body to participate in combustion reaction so as to promote oxidization of mercury in flue gas and improve the proportion of mercury oxide in the flue gas; and sulfur-contained additive solution enters a desulfurizing tower and reacts with the flue gas or mercury oxide in size to produce mercuric sulfide precipitation or flocculent complex, and finally mercury in the flue gas of the coal-fired power plants can be effectively removed, wherein a sulfur-contained additive solution storage tank is arranged on the side of a wet-process flue gas desulfurization system and communicated with at least one of a fresh size pipeline of a desulfurizing tower and an inlet and an outlet of a circulating pump of the desulfurizing tower. The method has the advantages of low investment and running cost of a mercury contamination control system while ensuring that the emission level of mercury contaminations in the coal-fired power plants meets stricter environmental protection standard requirements; and as the wet-process flue gas desulfurization system is widely adopted in the coal-fired power plants in China, the method is wide in applicability.

Description

technical field [0001] The invention relates to a pollution control method of a coal-fired power plant, in particular to a method for controlling mercury pollution in a coal-fired power plant suitable for wet flue gas desulfurization. Background technique [0002] Mercury is a highly toxic substance with characteristics of persistence, bioaccumulation, genotoxicity, and long-distance transmission. It will cause long-term and serious harm to the environment and human body. As a trace element in coal, most of mercury will be released into the atmosphere along with the flue gas during the coal combustion process. Although the mass concentration of mercury in the flue gas of coal-fired power plants is very low, only about 1-20 μg / m 3 , but its total amount is huge. According to the data of the US Environmental Protection Agency, about 1 / 3 of the mercury in the US atmospheric environment comes from the coal combustion of coal-fired power plants, ranking first in the source of h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/64
Inventor 钟犁肖平江建忠
Owner HUANENG CLEAN ENERGY RES INST
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