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

doi:10.1016/j.cjche.2023.07.004

中国化学工程学报 ›› 2024, Vol. 65 ›› Issue (1): 8-18.DOI: 10.1016/j.cjche.2023.07.004

• Full Length Article • 上一篇下一篇

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

Qiyao Yang^1,2, Xiaobin Qi^2,3, Qinggang Lyu^2,4,5, Zhiping Zhu^2,4,5

1 North China Electric Power University, Beijing 102206, China;
2 Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;
3 Shanxi Key Laboratory of Coal Flexible Combustion and Thermal Conversion, Datong 037000, China;
4 University of Chinese Academy of Sciences, Beijing 100049, China;
5 Shanxi Engineering Research Center of Coal Clean, Efficient Combustion and Gasification, Datong 037000, China

收稿日期:2023-03-07 修回日期:2023-07-25 出版日期:2024-01-28 发布日期:2024-04-17
通讯作者: Xiaobin Qi,E-mail:qixiaobin@iet.cn;Qinggang Lyu,E-mail:qglu@iet.cn
基金资助:
This work was financially supported by the Special Research Assistant Fund Project of Chinese Academy of Sciences.

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

Qiyao Yang^1,2, Xiaobin Qi^2,3, Qinggang Lyu^2,4,5, Zhiping Zhu^2,4,5

1 North China Electric Power University, Beijing 102206, China;
2 Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;
3 Shanxi Key Laboratory of Coal Flexible Combustion and Thermal Conversion, Datong 037000, China;
4 University of Chinese Academy of Sciences, Beijing 100049, China;
5 Shanxi Engineering Research Center of Coal Clean, Efficient Combustion and Gasification, Datong 037000, China

Received:2023-03-07 Revised:2023-07-25 Online:2024-01-28 Published:2024-04-17
Contact: Xiaobin Qi,E-mail:qixiaobin@iet.cn;Qinggang Lyu,E-mail:qglu@iet.cn
Supported by:
This work was financially supported by the Special Research Assistant Fund Project of Chinese Academy of Sciences.

摘要/Abstract

摘要： 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 (d₅₀:16.3-26.1 lm), and a relatively developed pore structure (specific surface area S_SA:139.29-551.97 m²·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 S_SA 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 S_SA 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.

关键词: Circulating fluidized bed, Coal gasification fly ash, Steam activation, Pore structure evolution, Fluidization activation

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 (d₅₀:16.3-26.1 lm), and a relatively developed pore structure (specific surface area S_SA:139.29-551.97 m²·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 S_SA 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 S_SA 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.

Key words: Circulating fluidized bed, Coal gasification fly ash, Steam activation, Pore structure evolution, Fluidization activation

Qiyao Yang, Xiaobin Qi, Qinggang Lyu, Zhiping Zhu. Experimental study on the activation of coal gasification fly ash from industrial CFB gasifiers[J]. 中国化学工程学报, 2024, 65(1): 8-18.

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.

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

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

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