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S-loaded activated carbon for mercury removal from flue gas and preparation method thereof

A technology of sulfur-loaded activated carbon and activated carbon, which is applied in the field of sulfur-loaded activated carbon and the preparation of the activated carbon, and achieves the effects of simple process method, high sulfur content and uniform surface distribution

Inactive Publication Date: 2009-07-08
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing technology achieves to increase the adsorption performance of activated carbon by modifying the functional groups of activated carbon, but there is no activated carbon specifically for the removal of flue gas mercury.

Method used

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  • S-loaded activated carbon for mercury removal from flue gas and preparation method thereof

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preparation example Construction

[0022] see figure 1 , the present invention also provides a method for preparing sulfur-loaded activated carbon for flue gas demercuration, the steps are as follows:

[0023] 1) Prepare materials. After rinsing the activated carbon with a particle size of 20-40 mesh with water, put it in a drying oven, bake it at 110°C for 1-2 hours, and set it aside; choose elemental sulfur, and the mass percentage of elemental sulfur in elemental sulfur is more than 99.9%. ;

[0024] 2) Thermal precipitation preparation. Take the heat-resistant container (crucible) filled with the above-mentioned elemental sulfur at the bottom of the thermal precipitation furnace, put the activated carbon into the stainless steel mesh in the middle of the thermal precipitation furnace, and the through hole of the stainless steel mesh is 200 mesh; then, seal the thermal precipitation furnace, and use 2L / min speed into high-purity N 2 30 to 40 minutes, exhaust the air in the heat deposition furnace; then ...

Embodiment 1

[0026] Embodiment 1: take by weighing each 10 grams of dried activated carbon and elemental sulfur and put them into two crucibles respectively, and then put them into a thermal precipitation furnace. Into N 2 30 minutes to vent the air in the furnace; adjust the N 2 The flow rate is 0.5L / min, heated to 550°C, and kept at a constant temperature for 60 minutes, then stop heating; supply protective gas to the furnace temperature to cool. The mass percent content of sulfur in the activated carbon was measured to be 21.34%.

Embodiment 2

[0027] Embodiment 2: Take by weighing 10 grams of dried activated carbon and 5 grams of elemental sulfur and put them into two crucibles respectively, and then put them into a thermal precipitation furnace. The order of placement is that the activated carbon crucible is on the top and the sulfur crucible is on the bottom; with a speed of 2L / min Access to N 2 40 minutes to vent the air out of the furnace; adjust N 2 The flow rate is 0.5L / min, heated to 600°C, and kept at a constant temperature for 80 minutes, then stop heating; supply protective gas to the furnace temperature to cool. The mass percent content of sulfur in the activated carbon was measured to be 19.65%.

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Abstract

The invention provides a sulfur-carrying active carbon for smoke gas demercuration and a preparation method thereof. The mass percentage content of sulfur of the sulfur-carrying active carbon is 18-30%, and the sulfur is evenly distributed on the surface of the active carbon and chemically combined with the active carbon; the granularity of the sulfur-carrying active carbon is 20-40 meshes.The preparation method comprises material preparation, thermo-precipitation preparation and cooling. In the invention, cheap sulfur is used as an additive agent of the active carbon, the content of the sulfur in the active carbon can reach 18-30% through the method of thermo-precipitation, and mercury in the smoke gas can be desorbed effectively. After the technique of thermo-precipitation, the active carbon has the advantages that the content of the sulfur is high and the sulfur is evenly distributed on the surface of the active carbon. In addition, the specific surface area, pore volume and pore diameter property and the like of the active carbon remain the same; the invention also is characterized in that the technique and the method are simple, the operation is easy and the cost is low, the method can be widely applied to the demercuration of smoke gas of coal-fired power factory and the like.

Description

technical field [0001] The invention belongs to the preparation technology of modified activated carbon, and in particular relates to a sulfur-loaded activated carbon used for flue gas demercuration and a method for preparing the activated carbon. Background technique [0002] Mercury emissions from coal-fired power plants are generally considered to be the largest source of mercury pollution. For a long time, in order to reduce the cost of flue gas demercury treatment and reduce environmental pollution, technicians in the field have made unremitting efforts to control the emission of mercury from coal-fired flue gas. For example CN1559668 discloses " the electrochemical regeneration method of flue gas demercury adsorption material ", and it adopts the adsorption material with large specific surface area such as active carbon as substrate, and infiltrates element modification such as sulfur, iodine, chlorine on the substrate surface, with Improve the adsorption specificity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/04B01D53/64
Inventor 刘清才鹿存房高威董凌燕温良英
Owner CHONGQING UNIV
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