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Biomass carbon-based flue gas demercuration adsorbent and preparation method thereof

A technology of biomass carbon and adsorbent, which is applied in the direction of separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of high preparation cost and low mercury removal efficiency, and achieve simple preparation methods, high mercury removal efficiency, Wide variety of effects

Inactive Publication Date: 2013-08-21
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of high preparation cost and low mercury removal efficiency of existing mercury removal adsorbents, and provide a cheap and efficient biomass carbon-based flue gas mercury removal adsorbent and its preparation method

Method used

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  • Biomass carbon-based flue gas demercuration adsorbent and preparation method thereof

Examples

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Embodiment 1

[0037] In this embodiment, mulberry branches (MT) are used as raw materials, and the raw materials of mulberry branch particles with a particle size of less than 3 mm are made through pretreatment processes such as air-drying, crushing and screening. Weigh about 150g of mulberry branch particles and quickly put them into a fixed-bed heating furnace with a pyrolysis temperature of 400, 600 or 800°C and continuous nitrogen flow (flow rate of 5L / min). Turn off the heater after pyrolysis for 10 minutes, and Cool to room temperature under atmosphere. After crushing, grinding and sieving, pyrolysis coke of mulberry branches with a particle size of less than 0.3 mm (such as MT400, MT600 and MT800) is obtained, and put into a reagent bottle for use.

[0038] Weigh about 50g of mulberry branches and pyrolyze coke, put it into a fixed-bed heating furnace with an activation temperature of 800°C, continuously feed nitrogen and water vapor into the furnace, and the nitrogen flow rate is 5L...

Embodiment 2

[0041] In this example, walnut shells (NS) are used as raw materials, and after pretreatment processes such as air-drying, crushing and sieving, walnut shell particles with a particle size of less than 3 mm are made; about 150 g of walnut shell particles are quickly put into the pyrolysis temperature of 600 ℃ and continuously fed with nitrogen (flow 5L / min) in a fixed-bed heating furnace, turn off the heater after pyrolysis for 10 minutes, cool to room temperature under a nitrogen atmosphere, and finally obtain a particle size smaller than 0.3mm walnut shell pyrolysis (NS600).

[0042] Add about 50g of walnut shell pyrolysis coke into a fixed-bed heating furnace with an activation temperature of 800°C and continuous flow of nitrogen and water vapor, where the nitrogen flow rate is 5L / min, N 2 :H 2 The molar ratio of O(g) is 1:1, the steam activated walnut shell coke (NS600-A ).

[0043] Weigh about 5g of steam-activated mulberry branch coke into 100mL of 10% and 30% H 2 o ...

Embodiment 3

[0045] In this example, wheat straw (WS) is used as the raw material, and after pretreatment processes such as air-drying, crushing and screening, the raw material of wheat straw particles with a particle size of less than 2mm is made; about 150g of wheat straw particles are quickly put into the pyrolysis temperature of 600°C In a fixed-bed heating furnace with nitrogen gas (flow rate 5L / min) continuously fed in, the heater is turned off after pyrolysis for 10 minutes, cooled to room temperature under a nitrogen atmosphere, and finally crushed, ground and sieved to obtain a particle size of less than 0.3 mm of straw pyrolysis (WS600).

[0046] Add about 50g of wheat straw pyrolysis coke into the fixed-bed heating furnace with an activation temperature of 800°C and continuous flow of nitrogen and water vapor, where the nitrogen flow rate is 5L / min, N 2 :H 2 The molar ratio of O(g) is 1:1, the water vapor is cut off after constant temperature activation for 30 minutes, cooled t...

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Abstract

The invention discloses a biomass carbon-based flue gas demercuration adsorbent and a preparation method thereof. Based on comprehensive utilization of biomass resources and control of flue gas mercury pollutants, the emission of flue gas mercury is controlled by using modified biomass tar as the adsorbent. The biomass carbon-based flue gas demercuration adsorbent with a developed pore structure and abundant surface functional groups is prepared through treating processes of pyrogenic decomposition (at 400-800 DEG C in a nitrogen atmosphere) and steam activation (at an activation temperature of 800 DEG C with an N2-to-H2O mole ratio of 1: 1) of biomass raw material, modified reagent (H2O2, ZnCl2, NaCl or NaBr) solution dipping, and the like; and the biomass carbon-based flue gas demercuration adsorbent has the characteristics of wide adsorbent raw material source, simple preparation process, low cost, high demercuration efficiency and the like, and is suitable for coal-fired power plants and management of flue gas mercury emission in the fields of waste incineration and the like. The carbon-based flue gas demercuration adsorbent is prepared by adopting biomass, so that the emission reduction of mercury pollution can be realized, and the renewable resource of biomass can be utilized efficiently in a large scale; and the biomass carbon-based flue gas demercuration adsorbent has obvious economic benefit, environmental benefit and social benefit.

Description

technical field [0001] The invention relates to a biomass carbon-based flue gas mercury removal adsorbent and a preparation method thereof, belonging to the technical field of comprehensive utilization of biomass resources and flue gas mercury removal. Background technique [0002] Among the mercury emissions caused by human activities, the mercury emissions from coal-fired power plants play a major role and have become the world's largest source of anthropogenic mercury emissions. Mercury is present as gaseous elemental mercury (Hg 0 ), gaseous oxidized mercury (Hg 2+ ) and particulate mercury (Hg p ) in three forms. Due to elemental mercury (Hg 0 ) has the characteristics of high volatility and insolubility in water. It has a long residence time in the atmosphere, is highly toxic, and has bioaccumulation, which poses a great threat to human health. Wang Qichao et al believe that the average mercury content of coal in my country is 0.22mg / kg, which is higher than the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/32B01D53/02
Inventor 卢平树童何楠祝秀明徐森荣
Owner NANJING NORMAL UNIVERSITY
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