Experimental study on the activation of coal gasification fly ash from industrial CFB gasifiers

Qiyao Yang; Xiaobin Qi; Qinggang Lyu; Zhiping Zhu

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Experimental study on the activation of coal gasification fly ash from industrial CFB gasifiers

Full Length Article | Updated：2026-01-06

- Experimental study on the activation of coal gasification fly ash from industrial CFB gasifiers
- Chinese Journal of Chemical Engineering Vol. 65, Issue 1, Pages: 8-18(2024)
- Affiliations：
  
  1. North China Electric Power University,Beijing,China,102206
  2. Institute of Engineering Thermophysics, Chinese Academy of Sciences,Beijing,China,100190
  3. Shanxi Key Laboratory of Coal Flexible Combustion and Thermal Conversion,Datong,China,037000
  4. University of Chinese Academy of Sciences,Beijing,China,100049
  5. Shanxi Engineering Research Center of Coal Clean, Efficient Combustion and Gasification,Datong,China,037000
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：2024
- Accepted：
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Qiyao Yang, Xiaobin Qi, Qinggang Lyu, Zhiping Zhu. Experimental study on the activation of coal gasification fly ash from industrial CFB gasifiers[J]. Chinese Journal of Chemical Engineering, 2024, 65(1): 8-18.
DOI：

Qiyao Yang, Xiaobin Qi, Qinggang Lyu, Zhiping Zhu. Experimental study on the activation of coal gasification fly ash from industrial CFB gasifiers[J]. Chinese Journal of Chemical Engineering, 2024, 65(1): 8-18. DOI：

摘要

Abstract

Coal gasification fly ash (CGFA) is an industrial solid waste from the coal circulating fluidized bed (CFB) gasification process

and it needs to be effectively disposed to achieve sustainable development of the environment. To realize the application of CGFA as a precursor of porous carbon materials

the physicochemical properties of three kinds of CGFA from industrial CFB gasifiers are analyzed. Then

the activation potential of CGFA is acquired

via

steam activation experiments in a tube furnace reactor. Finally

the fluidization activation technology of CGFA is practiced in a bench-scale CFB test rig

and its advantages are highlighted. The results show that CGFA is characterized by a high carbon content in the range of 54.06%-74.09%

an ultrafine particle size (

:16.3-26.1 lm)

and a relatively developed pore structure (specific surface area

:139.29-551.97 m

·g

-1

). The proportion of micropores in CGFA increases gradually with the coal rank. Steam activation experiments show that the pore development of CGFA mainly includes three stages:initial pore development

dynamic equilibrium between micropores and mesopores and pore collapse. The

of lignite fly ash (LFA)

subbituminous fly ash (SBFA) and anthracite fly ash (AFA) is maximally increased by 105%

13% and 72% after steam activation; the order of the largest carbon reaction rate and decomposition ratio of steam among the three kinds of CGFA is SBFA LFA AFA. As the ratio of oxygen to carbon during the fluidization activation of LFA is from 0.09 to 0.19

the carbon conversion ratio increases from 14.4% to 26.8% and the cold gas efficiency increases from 6.8% to 10.2%. The

of LFA increases by up to 53.9% during the fluidization activation process

which is mainly due to the mesoporous development. Relative to steam activation in a tube furnace reactor

fluidization activation takes an extremely short time (seconds) to achieve the same activation effect. It is expected to further improve the activation effect of LFA by regulating the carbon conversion ratio range of 27%-35% to create pores in the initial development stage.

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