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Method for removing elemental mercury in flue gas in liquid phase

A technology for elemental mercury and flue gas, applied in the field of flue gas purification, can solve the problems of insoluble in water, difficult to remove, easy to volatilize, etc., and achieve the effects of easy popularization and application, stable operation and easy product.

Inactive Publication Date: 2010-05-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hg 0 It has a high saturated vapor pressure, is extremely volatile and insoluble in water, and is difficult to remove by conventional pollutant control equipment, and almost all of it is discharged into the atmosphere, so Hg 0 The removal of mercury is the focus and difficulty of coal-fired flue gas mercury removal

Method used

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  • Method for removing elemental mercury in flue gas in liquid phase
  • Method for removing elemental mercury in flue gas in liquid phase

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: Take CuSO by weighing 4 、KIO 4 and KHCO 3 , add to the absorbent preparation container, add water and mix well, so that the absorbent includes 0.001M CuSO 4 、0.001M KIO 4 and 0.001M KHCO 3 . Use KOH to adjust the pH value of the absorbent to 9, heat to boiling, cool with ice water and filter to obtain the absorbent. Hg in jet bubble reactor 0 The reaction conditions for removal are: reaction temperature, 10° C.; absorbent concentration, 0.13 mmol / L; gas-liquid contact time, 0.5 seconds.

Embodiment 2

[0020] Embodiment 2: take by weighing CuSO 4 、KIO 4 and KHCO 3 , add to the absorbent preparation container, add water and mix well, so that the absorbent includes 0.005M CuSO 4 、0.001M KIO 4 and 0.004M KHCO 3 .Use KOH to adjust the pH value to 9, heat to boiling, filter in ice water to obtain the absorbent. In the jet bubbling reactor, Hg 0 The reaction conditions for removal are: reaction temperature, 30° C.; absorbent concentration, 0.13 mmol / L; gas-liquid contact time, 1 second.

Embodiment 3

[0021] Embodiment 3: take by weighing CuSO 4 、KIO 4 and H 2 o 2 , add to the absorbent preparation container, add water and mix well, so that the absorbent includes 0.01M CuSO 4 、0.001M KIO 4 and 0.003M H 2 o 2 . Adjust the pH value to 10 with KOH, heat to boiling, cool with ice water and filter to obtain the absorbent. Hg in jet bubble reactor 0 The reaction conditions for removal are: reaction temperature, 40° C.; absorbent concentration, 0.15 mmol / L; gas-liquid contact time, 1 second.

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Abstract

The invention provides a method for removing elemental mercury in a flue gas in a liquid phase. The method uses an absorbent to absorb H9O in the flue gas in a jet bubbling reactor, wherein the absorbent consists of an absorption liquid and an additive; the absorption liquid is a solution mixed by copper sulphate CuSO4 and potassium periodate KIO4; the concentration of CuSO4 is 0.001 M to 0.02 M / L, and the concentration of KIO4 is 0.001 M to 0.02 M / L; the additive is one of the following components: potassium bicarbonate KHCO3, hydrogen peroxide H2O2, potassium sulphate K2SO4 and potassium peroxydisulfate K2S2O8; and the concentration of the additive is 0.001 M to 0.05 M / L. The method can reach a removing efficiency of higher than 70 percent. The method for removing the elemental mercury in the flue gas in the liquid phase is characterized by high removing efficiency, low investment and operation costs, simple equipment, stable operation, easy treatment of product, convenient popularization and application and the like, and is suitable for large-size boilers and also suitable for medium and small-size boilers and other coal-burning equipment.

Description

technical field [0001] The invention relates to a flue gas purification method, in particular to the liquid-phase removal of elemental mercury (Hg 0 ) method belongs to the technical field of flue gas purification. Background technique [0002] Coal-fired power generation accounts for an important proportion of the total power generation. Taking China as an example, coal-fired power generation accounts for about 80% of the total power generation in its electricity composition. It is predicted that it will account for about 62.6% by 2015 and still account for 50% by 2050. %above. It can be seen that at present and for a long period of time in the future, the coal-based power structure will be difficult to change. Mercury is a toxic heavy metal trace element in coal. The mercury content in coal in the world is generally 0.012-33mg / kg, and the average mercury content is about 0.13mg / kg. The control of mercury emissions from coal combustion cannot be ignored. At present, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/64
Inventor 赵毅薛方明
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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