Numerical study on filtration characteristics of granular bed for high temperature coal pyrolysis gas

doi:10.1016/j.cjche.2025.08.013

中国化学工程学报 ›› 2025, Vol. 88 ›› Issue (12): 211-221.DOI: 10.1016/j.cjche.2025.08.013

Numerical study on filtration characteristics of granular bed for high temperature coal pyrolysis gas

Shuaiqiang Yang^1,2, Guangchao Ding¹, Zheqi Guo³, Lin Du¹, Wenli Song^1,4, Songgeng Li^1,4

1. State Key Laboratory of Mesoscience and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2. School of Petrochemical Engineering, Yan'an Vocational and Technical College, Yan'an 716000, China;
3. Liaoning Lvyuan Energy Environmental Protection Technology, Yingkou 115000, China;
4. Sino-Danish College, University of Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2025-06-16 修回日期:2025-08-21 接受日期:2025-08-24 出版日期:2026-02-09 发布日期:2025-09-12
通讯作者: Shuaiqiang Yang,E-mail:yshq83@163.com;Songgeng Li,E-mail:sgli@ipe.ac.cn
基金资助:
This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA29020400) and the National Key Research and Development Program of China (2018YFB0605003). The authors are grateful to the financial support from the Science and Technology Program of Yan'an (2023SLGYGG-001).

Numerical study on filtration characteristics of granular bed for high temperature coal pyrolysis gas

Shuaiqiang Yang^1,2, Guangchao Ding¹, Zheqi Guo³, Lin Du¹, Wenli Song^1,4, Songgeng Li^1,4

1. State Key Laboratory of Mesoscience and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2. School of Petrochemical Engineering, Yan'an Vocational and Technical College, Yan'an 716000, China;
3. Liaoning Lvyuan Energy Environmental Protection Technology, Yingkou 115000, China;
4. Sino-Danish College, University of Chinese Academy of Sciences, Beijing 100049, China

Received:2025-06-16 Revised:2025-08-21 Accepted:2025-08-24 Online:2026-02-09 Published:2025-09-12
Contact: Shuaiqiang Yang,E-mail:yshq83@163.com;Songgeng Li,E-mail:sgli@ipe.ac.cn
Supported by:
This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA29020400) and the National Key Research and Development Program of China (2018YFB0605003). The authors are grateful to the financial support from the Science and Technology Program of Yan'an (2023SLGYGG-001).

摘要/Abstract

摘要： Granular bed filter is one of the most promising technologies for the dust removal from high temperature coal pyrolysis gas. In this work, three-dimensional numerical models were employed to investigate the influence of operation parameters on collection efficiency, especially paying attention to particle deposition characteristics in the bed and outlet particle size distribution. The results show that the operation parameters have different effects on the collection efficiency of particles with the different properties. Under the same conditions, the collection efficiency of granular bed for circulating ash increases more rapidly compared to that of char particles. According to the effective Stokes number (N_steff), the collection efficiency of granular bed can be obviously divided into three regions: difficult separation region (N_steff≤0.25), transition region (0.25<N_steff<0.83) and easy separation region (N_steff≥0.83). Dust deposition within the bed exhibits axial attenuation along the gas flow direction, allowing classification of deposited particles into two characteristic types: dispersed particles and congregated particles. In addition, granular bed filtration induces a morphological transition of particle size distribution, transforming the original monomodal profile into a well-defined bimodal structure. A correlation formula of the collection efficiency was developed, providing critical insights for the engineering design of granular bed filters.

关键词: Granular bed filtration, Coal pyrolysis gas, Filtration, Numerical simulation, Packed bed

Abstract: Granular bed filter is one of the most promising technologies for the dust removal from high temperature coal pyrolysis gas. In this work, three-dimensional numerical models were employed to investigate the influence of operation parameters on collection efficiency, especially paying attention to particle deposition characteristics in the bed and outlet particle size distribution. The results show that the operation parameters have different effects on the collection efficiency of particles with the different properties. Under the same conditions, the collection efficiency of granular bed for circulating ash increases more rapidly compared to that of char particles. According to the effective Stokes number (N_steff), the collection efficiency of granular bed can be obviously divided into three regions: difficult separation region (N_steff≤0.25), transition region (0.25<N_steff<0.83) and easy separation region (N_steff≥0.83). Dust deposition within the bed exhibits axial attenuation along the gas flow direction, allowing classification of deposited particles into two characteristic types: dispersed particles and congregated particles. In addition, granular bed filtration induces a morphological transition of particle size distribution, transforming the original monomodal profile into a well-defined bimodal structure. A correlation formula of the collection efficiency was developed, providing critical insights for the engineering design of granular bed filters.

Key words: Granular bed filtration, Coal pyrolysis gas, Filtration, Numerical simulation, Packed bed

Shuaiqiang Yang, Guangchao Ding, Zheqi Guo, Lin Du, Wenli Song, Songgeng Li. Numerical study on filtration characteristics of granular bed for high temperature coal pyrolysis gas[J]. 中国化学工程学报, 2025, 88(12): 211-221.

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Numerical study on filtration characteristics of granular bed for high temperature coal pyrolysis gas

Numerical study on filtration characteristics of granular bed for high temperature coal pyrolysis gas

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