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Fate of the Chlorine in Coal in the Heating Process

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ISIJ Int. 58(2)_ 227-235 (2018).pdf866.97 kBPDFView/Open
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Title: Fate of the Chlorine in Coal in the Heating Process
Authors: Tsubouchi, Naoto Browse this author →KAKEN DB
Mochizuki, Yuuki Browse this author →KAKEN DB
Wang, Yanhui Browse this author
Ohtsuka, Yasuo Browse this author
Keywords: coal
chlorine distribution
HCL formation
chlorine enrichment
Issue Date: 15-Feb-2018
Publisher: Iron and Steel Institute of Japan
Journal Title: ISIJ International
Volume: 58
Issue: 2
Start Page: 227
End Page: 235
Publisher DOI: 10.2355/isijinternational.ISIJINT-2017-302
Abstract: Pyrolysis of 29 coals with carbon contents of 71–92 mass% on a dry, ash-free basis (daf) has been performed mainly in a temperature-programmed mode at 10°C/min up to 800°C with a flow-type fixed bed quartz reactor, and some factors controlling HCl formation have been examined. The rate profiles of HCl formation exhibit at least three distinct peaks at around 260–360, 470–510 and 580–630°C, and the lowest temperature peak is present for 8 coals alone, whereas the middle and highest temperature peaks are common with almost all of the coals. The HCl profile is also affected by the size of coal particles and the height of coal particles in the fixed bed. Yields of HCl and char-Cl at 800°C for 28 coals except an American bituminous coal are 44–95 and 4–54%, respectively, and tar-Cl is as low as ≤ 7% in all cases. The chlorine distribution is almost independent of the heating rate in the range of 2.5–400°C/min and has no distinct relationship with carbon or chlorine content in coal, but HCl tends to increase with increasing amount of (Na + 2Ca) in coal with a corresponding decrease in char-Cl. When an Indonesian sub-bituminous coal is injected into an O2-blown entrained bed gasifier under pressure, there is an almost 1:1 relationship between carbon and nitrogen conversions, whereas the sulfur and chlorine are enriched in the remaining char, and the degree of the enrichment is higher with chlorine. The method of evaluating coal-Cl forms quantitatively using model chlorine compounds is proposed.
Rights: 著作権は日本鉄鋼協会にある
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 坪内 直人

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