Influence of temperature and Ca(OH)2 on releasing tar and coal gas during lignite coal pyrolysis and char gasification

doi:10.1016/j.cjche.2019.05.013

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (11): 2788-2798.DOI: 10.1016/j.cjche.2019.05.013

• Energy, Resources and Environmental Technology • 上一篇下一篇

Influence of temperature and Ca(OH)₂ on releasing tar and coal gas during lignite coal pyrolysis and char gasification

Sunel Kumar¹, Zhihua Wang¹, Zhang Kang¹, Jun Xia², Ronald Whiddon¹, Yong He¹, Jaffri Gul-e-Rana³, Zain Ali Saleh Bairq⁴, Kefa Cen¹

1 State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China;
2 Department of Mechanical, Aerospace and Civil Engineering, Brunel University London, Uxbridge UB8 3PH, UK;
3 Fuel Research Centre, PCSIR, Karachi 75280, Pakistan;
4 College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China

收稿日期:2018-11-12 修回日期:2019-05-07 出版日期:2019-11-28 发布日期:2020-01-19
通讯作者: Zhihua Wang, Jun Xia
基金资助:
Supported by the Innovation Reasearch Groups of the National Natural Science Foundation of China (51621005), and EPSRC from the UK.

Influence of temperature and Ca(OH)₂ on releasing tar and coal gas during lignite coal pyrolysis and char gasification

Sunel Kumar¹, Zhihua Wang¹, Zhang Kang¹, Jun Xia², Ronald Whiddon¹, Yong He¹, Jaffri Gul-e-Rana³, Zain Ali Saleh Bairq⁴, Kefa Cen¹

1 State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China;
2 Department of Mechanical, Aerospace and Civil Engineering, Brunel University London, Uxbridge UB8 3PH, UK;
3 Fuel Research Centre, PCSIR, Karachi 75280, Pakistan;
4 College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China

Received:2018-11-12 Revised:2019-05-07 Online:2019-11-28 Published:2020-01-19
Contact: Zhihua Wang, Jun Xia
Supported by:
Supported by the Innovation Reasearch Groups of the National Natural Science Foundation of China (51621005), and EPSRC from the UK.

摘要/Abstract

摘要： The yield of tar and syngas has been investigated by catalytic pyrolysis of Pingzhuang lignite (PZL) over Ca(OH)₂ catalyst in temperature range of 600℃-1000℃ in a tube furnace. The results show that the yield of volatile pyrolysis increases and char decreases with rising temperature for both raw and catalyzed Pingzhuang lignite. The hydrogen fraction (H₂) increased from 20% to 40% for the PZL sample; but, for the PZL-Ca(OH)₂ sample, H₂ fraction fluctuated randomly between 35% to 42%, with the maximum H₂ fraction found at 1000℃. The Gaschromatography mass-spectroscopic (GC-MS) analysis revealed that the maximum tar yield at 800℃ and 700℃ was obtained for PZL and PZL-Ca(OH)₂, respectively. The surface morphology of PZL and PZL-Ca(OH)₂ chars underwent different transformation in the presence of catalyst as illustrated by SEM/EDX, FTIR, and BET analysis. Furthermore, char sample was investigated for the carbon conversion and reactivity index using TGA analysis under N₂ and CO atmosphere.

关键词: Catalyzed coal pyrolysis, Release volatiles of tar and coal gas, Surface area, Pore volume

Abstract: The yield of tar and syngas has been investigated by catalytic pyrolysis of Pingzhuang lignite (PZL) over Ca(OH)₂ catalyst in temperature range of 600℃-1000℃ in a tube furnace. The results show that the yield of volatile pyrolysis increases and char decreases with rising temperature for both raw and catalyzed Pingzhuang lignite. The hydrogen fraction (H₂) increased from 20% to 40% for the PZL sample; but, for the PZL-Ca(OH)₂ sample, H₂ fraction fluctuated randomly between 35% to 42%, with the maximum H₂ fraction found at 1000℃. The Gaschromatography mass-spectroscopic (GC-MS) analysis revealed that the maximum tar yield at 800℃ and 700℃ was obtained for PZL and PZL-Ca(OH)₂, respectively. The surface morphology of PZL and PZL-Ca(OH)₂ chars underwent different transformation in the presence of catalyst as illustrated by SEM/EDX, FTIR, and BET analysis. Furthermore, char sample was investigated for the carbon conversion and reactivity index using TGA analysis under N₂ and CO atmosphere.

Key words: Catalyzed coal pyrolysis, Release volatiles of tar and coal gas, Surface area, Pore volume

Sunel Kumar, Zhihua Wang, Zhang Kang, Jun Xia, Ronald Whiddon, Yong He, Jaffri Gul-e-Rana, Zain Ali Saleh Bairq, Kefa Cen. Influence of temperature and Ca(OH)₂ on releasing tar and coal gas during lignite coal pyrolysis and char gasification[J]. 中国化学工程学报, 2019, 27(11): 2788-2798.

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Influence of temperature and Ca(OH)₂ on releasing tar and coal gas during lignite coal pyrolysis and char gasification

Influence of temperature and Ca(OH)₂ on releasing tar and coal gas during lignite coal pyrolysis and char gasification

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