Measurement of critical self-ignition temperatures of low rank coal

Yongjun Wang, Kyuro Sasaki, Yuichi Sugai, Xiaoming Zhang

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

Considerable research exists on self-heating or spontaneous combustion of coal stockpiles from various aspects. The equation for critical temperature of self-ignition was derived from the Frank-Kamenetskii model expressing heat balance between heat generation rate in the centre of a coal pile and heat transfer from the outer surface of the pile. However, critical ignition-temperatures of low-rank coals have not been established for safety criteria in storing and transporting these coal. In this study, experimental apparatus and measurement procedures of thermal diffusivity and internal temperature in the coal pile have been presented to evaluate the critical self-ignition temperature of coal samples. The coal samples tested were low-rank lignite and sub-bituminous. Their critical ignition-temperatures were evaluated based on laboratory temperature measurements of coal piles in cube mesh-boxes of three different sizes (25, 50 and 100 mm side length) placed in hot ambient-air at temperatures ranging from 50 to 140 ºC under standard atmospheric pressure. Analysis of the results has enabled the critical ignition-temperature of the coal sample to be presented as a function of stockpile volume.
本文言語英語
ホスト出版物のタイトルProceedings of the Coal Operators' Conference 2014
編集者Naj Aziz
出版社University of Wollongong
ページ 339-343
ページ数5
ISBN(電子版)978 1 925100 02 0
出版ステータス出版済み - 2 12 2014
イベント14th Coal Operators’ Conference (COAL2014) (Wollongong, Australia) - Wollongong, オーストラリア
継続期間: 2 13 20122 14 2014

会議

会議14th Coal Operators’ Conference (COAL2014) (Wollongong, Australia)
国/地域オーストラリア
CityWollongong
Period2/13/122/14/14

All Science Journal Classification (ASJC) codes

  • 燃料技術
  • 地盤工学および土木地質学

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