Sorbent for removing mercury from flue gas and preparation method thereof

An adsorbent and mercury removal technology, which is applied in separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of complex manufacturing process and high cost, and achieve the effect of uniform distribution, low cost, and easy operation

Active Publication Date: 2009-08-05
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As can be seen from the above description, the existing preparation process has the disadvantages of complicated manufacturing process and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The adsorbent for flue gas demercuration in this embodiment includes activated carbon and sulfur evenly distributed on the surface of the activated carbon, the particle size of the activated carbon is 20-40 mesh, and the mass percentage of sulfur is 7%;

[0019] The preparation method of the adsorbent for flue gas demercuration of the present embodiment comprises the following steps:

[0020] a. Dry the activated carbon at 105°C until the water absorption is less than 1%;

[0021] b. Put the activated carbon in step a into a heat-resistant container and place the heat-resistant container in the lower part of the heat-precipitation furnace, place the elemental sulfur in the middle of the heat-precipitation furnace, seal the heat-precipitation furnace, and feed it into the high-temperature furnace at a rate of 1L / min Pure N 2 30min, replace the air in the thermal precipitation furnace; then adjust the N 2 The flow rate is 0.5L / min, the temperature is raised to 400°C, an...

Embodiment 2

[0025] The adsorbent for flue gas demercuration in this embodiment includes activated carbon and sulfur evenly distributed on the surface of the activated carbon, the particle size of the activated carbon is 20-40 mesh, and the mass percentage of sulfur is 10.34%;

[0026] The preparation method of the adsorbent for flue gas demercuration of the present embodiment comprises the following steps:

[0027] a. Dry the activated carbon at 105°C until the water absorption is less than 1%;

[0028] b. Put the activated carbon in step a into a heat-resistant container and place the heat-resistant container in the lower part of the heat-precipitation furnace, place the elemental sulfur in the middle of the heat-precipitation furnace, seal the heat-precipitation furnace, and feed it into the high-temperature furnace at a rate of 2L / min Pure N 2 40min, replace the air in the thermal precipitation furnace; then adjust the N 2 The flow rate is 0.5L / min, the temperature is raised to 550°C...

Embodiment 3

[0031] The adsorbent for flue gas demercuration in this embodiment includes activated carbon and sulfur evenly distributed on the surface of the activated carbon, the particle size of the activated carbon is 20-40 mesh, and the mass percentage of sulfur is 17%;

[0032] The preparation method of the adsorbent for flue gas demercuration of the present embodiment comprises the following steps:

[0033] a. Dry the activated carbon at 105°C until the water absorption is less than 1%;

[0034] b. Put the activated carbon in step a into a heat-resistant container and place the heat-resistant container in the lower part of the heat-precipitation furnace, place the elemental sulfur in the middle of the heat-precipitation furnace, seal the heat-precipitation furnace, and feed it into the high-temperature furnace at a rate of 2L / min Pure N 2 40min, replace the air in the thermal precipitation furnace; then adjust the N 2 The flow rate is 0.5L / min, the temperature is raised to 600°C, a...

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Abstract

The invention discloses an adsorbent for removing mercury from flue gas and a method for preparing the same. The adsorbent comprises active carbon and sulfur evenly distributed on the surface of the active carbon; the grain size of the active carbon is between 20 and 40 meshes, and the mass percentage content of the sulfur is between 1 and 17 percent; in the method, the low-priced sulfur is used as the additive of the active carbon, and the adsorbent is obtained by the thermal precipitation method, thereby effectively removing the mercury from the flue gas; the adsorbent has the characteristics of high sulfur content, even distribution of sulfur on the surface of the active carbon and the like, and in the aspects of specific surface area, pore volume, pore diameter, and the like, the active carbon also has the advantages of the common active carbon; the adsorbent can be placed in a fixed adsorption bed or fluidized adsorption bed; when the adsorbent is used to remove mercury from the mercury-containing flue gas and other gases, the adsorbent can achieve obvious effect and long time of usage; moreover, the adsorbent has the advantages of simple technological process, easy operation and low cost, and can be widely applied to the mercury removal of the flue gas in a coal-fired power plant.

Description

technical field [0001] The invention relates to an adsorbent technology, in particular to an adsorbent for flue gas demercuration and a preparation method thereof. Background technique [0002] Mercury emissions from coal-fired power plants are generally considered to be the largest source of mercury pollution. Mercury removal generally adopts an adsorption process, and the production cost and process of the adsorbent have always been problems to be solved urgently by those skilled in the art. [0003] In the prior art, there are many kinds of adsorbent manufacturing processes. For example, the patent application with the publication number CN1559668 discloses the "electrochemical regeneration method of flue gas mercury removal adsorption material". The material is a matrix, and the surface of the matrix is ​​modified by infiltrating elements such as sulfur, iodine, and chlorine to improve the adsorption specificity and adsorption capacity of the material for mercury. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/32B01D53/02B01D53/64
Inventor 杨剑杜云贵刘清才刘艺董凌燕隋建才洪燕丁小红吴其荣
Owner CHONGQING UNIV
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