中国安全科学学报 ›› 2018, Vol. 28 ›› Issue (5): 68-73.doi: 10.16265/j.cnki.issn1003-3033.2018.05.012

• 安全工程技术科学 • 上一篇    下一篇

水浸干燥作用对煤自燃特性及预测指标影响研究

翟小伟1,2 教授, 葛晖1, 王凯1,2, 吴世博1, 王庭焱1   

  1. 1 西安科技大学 安全科学与工程学院,陕西 西安 710054;
    2 陕西省煤火灾害防治重点实验室,陕西 西安 710054
  • 收稿日期:2018-02-02 修回日期:2018-04-08 出版日期:2018-05-28 发布日期:2020-11-25
  • 作者简介:翟小伟(1979—),男,陕西富平人,博士,教授,主要从事矿井火灾防治理论与技术研究。
  • 基金资助:
    国家自然科学基金资助(51404195,51704226);陕西省自然科学基础研究计划(2017JQ5047)。

Research on influences of water soaking-drying on coal spontaneous combustion characteristics and predictive index

ZHAI Xiaowei1,2 , GE Hui1, WANG Kai1,2, WU Shibo1, WANG Tingyan1   

  1. 1 College of Safety Science and Engineering,Xi' an University of Science & Technology,Xi' an Shaanxi 710054,China;
    2 Key Laboratory of Coal Fire and Hazard Prevention,Shaanxi Province,Xi' an Shaanxi 710054,China
  • Received:2018-02-02 Revised:2018-04-08 Online:2018-05-28 Published:2020-11-25

摘要: 为研究水浸干燥作用对煤自燃特性的影响,采用真空干燥法与自然风干法分别处理水浸过的煤样,通过程序升温试验测试原煤样与处理后的2种煤样在氧化过程中产生的CO体积分数和C2H4体积分数,根据CO体积分数增长速率突变点和C2H4产生温度分别计算3种煤样自燃特征温度,分析水浸干燥作用对据煤样自燃特征温度的影响;通过氧化放热公式计算3种煤样的耗氧速率和放热强度,分析水浸干燥作用对煤样氧化放热性能的影响;最后分析水浸干燥作用对格雷哈姆系数R2R3和链烷比预测煤自燃特征温度准确性的影响。结果表明:水浸干燥作用改变煤的自燃特性,升高煤自燃特征温度,降低煤氧化放热性能,使格雷哈姆系数R2R3预测煤自燃特征温度的准确性降低,但对链烷比预测煤自燃特征温度的准确性影响较小。

关键词: 水浸干燥作用, 煤自燃特性, 特征温度, 氧化放热性能, 预测指标

Abstract: In order to study the influences of water soaking-drying on the coal spontaneous combustion characteristics,coal samples were treated by using both the vacuum drying method and the natural drying method after water soaking to form two-treated coal samples.Temperature-programming experiments were carried out on both the raw coal sample and the two-treated coal samples to measure volume fractions of the CO and C2H4 generated in oxidation process.The spontaneous combustion characteristic temperatures were calculated in light of the change point of CO volume fraction growth rate and C2H4 generation temperature of the three coal samples,and the influences of water soaking-drying on the spontaneous combustion characteristic temperature of three coal samples were analyzed.The oxygen consumption rate and exothermal strength were calculated by the oxidative exothermic formulas,and the influences of water soaking-drying on oxidative exothermic performance of three coal samples were analyzed.At last,the influence of water soaking-drying on the Graham coefficient R2 or R3 or alkane ratio for prediction accuracy of the coal spontaneous combustion characteristic temperature was analyzed.The experimental researches show that water soaking-drying will change coal spontaneous combustion characteristics,increase the characteristic temperature of coal spontaneous combustion and reduce coal oxidative exothermic performance,Graham coefficient R2 or R3 for prediction accuracy of the coal spontaneous combustion characteristic temperature will be decreased by water soaking-drying,and as alkane ratio,the prediction accuracy will be less affected by water soaking-drying.

Key words: water soaking-drying, coal spontaneous combustion characteristics, critical temperature, oxidative exothermic performance, predictive index

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