Spontaneous-combustion propensity of New Zealand coals under adiabatic conditions

被引:136
作者
Beamish, BB [1 ]
Barakat, MA
St George, JD
机构
[1] Univ Queensland, Dept Min Minerals & Mat Engn, Brisbane, Qld 4072, Australia
[2] Univ Auckland, Dept Civil & Resource Engn, Auckland 1, New Zealand
关键词
spontaneous combustion; adiabatic oven; self-heating rate; coal rank;
D O I
10.1016/S0166-5162(00)00034-3
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 [动力工程及工程热物理]; 0820 [石油与天然气工程];
摘要
Pulverised New Zealand coal samples have been tested from an initial temperature of 40 degreesC and reacted adiabatisally in an oven with oxygen to provide a full temperature history of auto-oxidation up to the self-sustained process of combustion. This procedure produces a self-heating rate index, R-70, calculated as the ratio of the time taken to reach 70 degreesC (degreesC/h). The R-70 index is a measure of the coal's propensity to spontaneous combustion. R-70 values for New Zealand coals are much higher than any previously published results. They show a rank dependence, whereby subbituminous coals have the highest propensity to spontaneous combustion (14.91-17.23 degreesC/h). A lignite sample has an R-70 value of 7.76 degreesC/h, and high-volatile bituminous B coals have R-70 values of 0.31-2.23 degreesC/h. Samples stored for 2 years show the same rank trend. The nature of this trend is most likely a function of the internal surface area of the coal that governs the available sites for oxidation. Calculating the Suggate rank; for any New Zealand coal can be used to rare its propensity to spontaneous combustion. Resin bodies in the subbituminous coal show no propensity to spontaneous combustion. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:217 / 224
页数:8
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