粒径对褐煤自燃阶段临界温度影响的试验研究

doi:10.16265/j.cnki.issn1003-3033.2018.04.007

中国安全科学学报 ›› 2018, Vol. 28 ›› Issue (4): 36-41.doi: 10.16265/j.cnki.issn1003-3033.2018.04.007

粒径对褐煤自燃阶段临界温度影响的试验研究

张晓明^1,2 教授, 吴琦¹, 张河猛¹, 王永军¹, 佐佐木久郎³ 教授

1 辽宁工程技术大学矿业学院,辽宁阜新 123000
2 辽宁工程技术大学工程与环境研究所, 辽宁葫芦岛 125000
3 九州大学工学府,日本福冈 819-0385

收稿日期:2018-01-03 修回日期:2018-03-12 出版日期:2018-04-28 发布日期:2020-09-28
作者简介:张晓明(1962—),男,吉林长春人,博士,教授,博士生导师,主要从事地下空间气象环境、煤层气和可燃冰开发、CO₂地下封存、土木基础设施抗震性能评估、煤炭自然发火特性等方面的研究。E-mail:xmzhang7@126.com。

Experimental study on effect of particle size on lignite critical self-ignition temperature

ZHANG Xiaoming^1,2, WU Qi¹, ZHANG Hemeng¹, WANG Yongjun¹, SASAKI Kyuro³

1 College of Mining Engineering,Liaoning Technical University,Fuxin Liaoning 123000,China
2 Institute of Engineering and Environment,Liaoning Technical University,Huludao Liaoning 125000,China
3 Faculty of Engineering,Kyushu University,Fukuoka 819-035,Japan

Received:2018-01-03 Revised:2018-03-12 Online:2018-04-28 Published:2020-09-28

摘要/Abstract

摘要： 为研究褐煤在堆积状态下的自然发火特性,开展实验室试验,基于Frank-Kamenetskii理论,采用开放式恒温加热方法,将6种不同粒径的褐煤煤样分别放入5、10和15cm等尺寸的立方体网篮,组成18个自然堆积状态的煤堆,并置于不同的恒温条件下,研究煤堆的升温过程,探讨粒径对煤氧化过程中自燃阶段临界温度的影响。结果表明:煤堆的升温过程可分为初始升温、缓慢升温、快速升温和自燃(或温度回落)4个阶段;在煤堆体积相同时,煤样粒径的减小会使自燃阶段临界温度降低,随着煤堆体积的增大,粒径影响逐渐减弱直至可被忽略。

关键词: 褐煤, 自然发火, 开放式恒温加热法, 自燃阶段临界温度, 煤样粒径, 网篮体积

Abstract: Based on the Frank-Kamenetskii theory and the open constant temperature heating method, characteristics of lignite spontaneous combustion were studied. 6 lignite coal samples different in particle size were put into 5, 10 and 15 cm in length cube basket, and 18 coal piles. Experiments were carried out under different constant temperature conditions to study the temperature rise process of the coal pile and to investigate the effect of particle size on the critical self-ignition temperature of the spontaneous combustion stage during coal oxidation. The experimental results show that the temperature rise process of the coal pile can be divided into four stages, an initial temperature increase stage, a slow temperature rise stage, a rapid temperature rise stage, and a spontaneous combustion (or temperature drop) stage, that under constant coal pile volume conditions, the smaller the particle size, the lower the critical self-spontaneous combustion point, and that with the increase of the coal pile size, the effect of particle size on coal critical self-ignition temperature is gradually weakened until it can be ignored.

Key words: lignite, spontaneous combustion, open constant temperature heating method, critical self-ignition temperature, coal particle size, basket volume

中图分类号:

X936

张晓明, 吴琦, 张河猛, 王永军, 佐佐木久郎. 粒径对褐煤自燃阶段临界温度影响的试验研究[J]. 中国安全科学学报, 2018, 28(4): 36-41.

ZHANG Xiaoming, WU Qi, ZHANG Hemeng, WANG Yongjun, SASAKI Kyuro. Experimental study on effect of particle size on lignite critical self-ignition temperature[J]. China Safety Science Journal, 2018, 28(4): 36-41.

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粒径对褐煤自燃阶段临界温度影响的试验研究

Experimental study on effect of particle size on lignite critical self-ignition temperature

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