Preparation method for flue gas mercury-removing active carbon

A technology of activated carbon and granular activated carbon, applied in separation methods, chemical instruments and methods, other chemical processes, etc., can solve the problems of low saturation adsorption capacity of mercury, easy secondary shedding of mercury, etc. Mercury efficient effect

Active Publication Date: 2014-11-19
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009]Technical problem to be solved: in order to solve the shortcomings of the existing flue gas mercury removal adsorbents such as low mercury saturation adsorption capacity and easy secondary shedding of mercury, make full use of the gaseous element mercury in the Physical adsorption and chemical a

Method used

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  • Preparation method for flue gas mercury-removing active carbon
  • Preparation method for flue gas mercury-removing active carbon
  • Preparation method for flue gas mercury-removing active carbon

Examples

Experimental program
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Example Embodiment

[0033] Example 1

[0034] (1) Removal of surface chemical groups from raw materials: The coconut shell-based granular activated carbon raw materials are washed with 10 wt.% NaOH solution and dried at 150°C.

[0035] (2) Impregnation of halogenated salt: immerse 30 g of activated carbon raw material in a potassium chloride solution with a mass concentration of 15 wt.%, stir for 4 hours, and filter and dry.

[0036] (3) Load halogen: Put the activated carbon loaded with potassium chloride into the U-shaped tube to form a packing layer, and the air with chlorine gas at 300mL / min is input from the top of the packing layer, the chlorine concentration is 0.13mg / L, and it is maintained at room temperature for 10h. The chlorine molecules are evenly loaded into the micropores of the activated carbon, and the chlorine and potassium chloride combine to form the thermally stable trichloride KCl 3 .

[0037] (4) The activated carbon loaded with chlorine is heated at 110°C for 1 hour to remove vol...

Example Embodiment

[0039] Example 2

[0040] (1) Removal of surface chemical groups from raw materials: the coconut shell-based granular activated carbon raw materials are washed with 30 wt.% NaOH solution and dried at 150°C.

[0041] (2) Impregnation of halogenated salt: immerse 30 g of activated carbon raw material in a potassium bromide solution with a mass concentration of 20 wt.%, stir for 12 hours, and filter and dry.

[0042] (3) Load halogen: put the activated carbon loaded with potassium bromide into the U-shaped tube to form a packing layer, and bring bromine into the top of the packing layer at 300 mL / min of air. The bromine concentration is 0.21 mg / L, maintained at room temperature 10h, the bromine molecules are uniformly loaded into the micropores of the activated carbon, and the bromine and potassium bromide combine to form a thermally stable tribromide KBr 3 .

[0043] (4) Heat the bromine-loaded activated carbon at 110°C for 2 hours to remove the volatile bromine, and prepare a flue gas...

Example Embodiment

[0045] Example 3

[0046] (1) Removal of surface chemical groups from raw materials: the coconut shell-based granular activated carbon raw materials are washed with 30 wt.% NaOH solution and dried at 150°C.

[0047] (2) Impregnation of halogenated salt: immerse 50 g of activated carbon raw material in a potassium iodide solution with a mass concentration of 50 wt.%, stir for 12 hours, and filter and dry.

[0048] (3) Load halogen: Put the activated carbon loaded with potassium iodide into the U-shaped tube to form a packing layer, and carry iodine in the air at 300mL / min from the top of the packing layer. The iodine concentration is 0.23mg / L, and it is maintained at room temperature for 10 hours. The molecules are uniformly loaded into the micropores of activated carbon, and the bromine and potassium bromide combine to form a thermally stable triiodide KI 3 .

[0049] (4) Heat the iodine-loaded activated carbon at 100°C for 1 hour to remove volatile iodine, and prepare a flue gas mer...

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Abstract

The invention provides a preparation method for flue gas mercury-removing active carbon. The preparation method comprises the following steps: step 1, removing a surface chemical group of a raw material: washing the particle active raw material with 10.wt%-30.wt% NaOH solution and drying the raw materials at 100-120 DEG C; step 2, immersing halide salt: mixing, immersing and agitating the raw material active carbon with an oxygen-containing group on the surface and a halide salt solution according to the mass ratio ranging from 1:1 to 1:5 for 4-12 hours; filtering and drying to obtain active carbon carrying the halide salt, wherein the concentration of the halide salt solution is 10wt.%-50wt.%; step 3, loading halogen: putting the active carbon carrying the halide salt into a U-shaped pipe to form a filling layer; inputting air with the halogen from the top of the filling layer at the speed of 100-500mL/min and keeping the heat for 1-10 hours at room temperature to obtain saturated halogen-loaded active carbon; and step 4, heating the saturated halogen-loaded active carbon at the temperature in a range of 80-120 DEG C to remove the volatile halogen to prepare the flue gas mercury-removing active carbon.

Description

[0001] technical field [0002] The invention belongs to the technical field of flue gas mercury removal activated carbon, in particular to a preparation method of highly efficient flue gas mercury removal activated carbon. [0003] Background technique [0004] Coal will still be the main energy source of electricity in the future, and the mercury pollution caused by coal-fired flue gas has become another major global ecological environmental problem after climate change. Mercury compounds and sulfur dioxide dust in coal combustion emissions are also the main causes of PM2.5 formation, which is the root cause of haze weather. At present, my country's coal consumption ranks first in the world. By 2020, China's coal power will still account for 72%, requiring about 2.7 billion tons of coal. It is estimated that by 2035, 43% of the world's electricity supply will still come from coal. During coal combustion, mercury evaporates and is discharged into the atmosphere with flue ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01D53/64B01D53/81
Inventor 孙康蒋剑春卢辛成邓先伦陈超贾羽洁
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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