Influence of temperature and Ca(OH)2 on releasing tar and coal gas during lignite coal pyrolysis and char gasification |
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| Authors: | Sunel Kumar Zhihua Wang Zhang Kang Jun Xia Ronald Whiddon Yong He Jaffri Gul-e-Rana Zain Ali Saleh Bairq Kefa Cen |
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| Affiliation: | State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China;Department of Mechanical, Aerospace and Civil Engineering, Brunel University London, Uxbridge UB83PH, UK;Fuel Research Centre, PCSIR, Karachi 75280, Pakistan;College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China |
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| 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. |
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| Keywords: | Catalyzed coal pyrolysis Release volatiles of tar and coal gas Surface area Pore volume |
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