SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (11): 2788-2798.DOI: 10.1016/j.cjche.2019.05.013

• Energy, Resources and Environmental Technology • Previous Articles     Next Articles

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. 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:2020-01-19 Published:2019-11-28
  • 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.

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. 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
  • 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.

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

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