承压破碎煤体低温氧化特征与宏观致因分析

doi:10.16265/j.cnki.issn1003-3033.2019.09.012

中国安全科学学报 ›› 2019, Vol. 29 ›› Issue (9): 77-83.doi: 10.16265/j.cnki.issn1003-3033.2019.09.012

承压破碎煤体低温氧化特征与宏观致因分析

褚廷湘¹ 副教授, 韩学锋² 副教授, 余明高² 教授

1 华北科技学院安全工程学院,河北三河 065201;
2 河南理工大学安全科学与工程学院,河南焦作 454003

收稿日期:2019-06-03 修回日期:2019-07-25 出版日期:2019-09-28
作者简介:褚廷湘 (1981—),男,河南南阳人,博士,副教授,主要从事采空区瓦斯与煤自燃共生灾害防治理论与技术方面的研究。E-mail:ctx1900@126.com。
基金资助:
国家自然科学基金资助(51774114);中央高校基本科研业务费资助项目(3142018028,3142018002)。

Low-temperature oxidation characteristics of compacted broken coal and macroscopic cause analysis

CHU Tingxiang¹, HAN Xuefeng², YU Minggao²

1 School of Safety Engineering, North China Institute of Science and Technology, Sanhe Hebei 065201, China;
2 School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo Henan 454003, China

Received:2019-06-03 Revised:2019-07-25 Published:2019-09-28

摘要/Abstract

摘要： 为识别应力加载对破碎煤体氧化进程的影响作用,首先通过自主设计的试验装置,开展不同应力加载下的破碎煤体低温氧化试验;其次结合试验数据,分析煤氧化过程中耗氧速度、CO、C₂H₄气体的发生特征;最后,探究不同应力状态下造成煤氧化差异性的原因。结果表明:在相同温度点下,随着轴向加载强度的增大,反应体系内的耗氧强度增大,CO及C₂H₄气体的发生量增大,且C₂H₄的发生温度点提前;随着轴压增大,煤样的氧化活性增强,有助于低温氧化及自燃的发生;承压破碎煤体的分形维数增大、比表面积增加、导热系数增大是煤氧化行为差异性的致因。

关键词: 承压破碎煤体, 采空区, 应力恢复, 低温氧化, 煤自燃

Abstract: In order to identify the effects of stress loading on the oxidation process of broken coal, firstly, using self-designed experimental devices, low-temperature oxidation experiments of compacted broken coal were conducted under different stress loading. Secondly, the oxygen consumption rate, CO and C₂H₄gas generation characteristics were analyzed based on the test data. Finally, variation causes of coal oxidation under different stress loading states were analyzed. Results show that,while at the same temperature, the oxygen consumption intensity and generation amount of CO and C₂H₄will increase with the increase of axial loading strength, and the C₂H₄ occurrence temperature was advanced, with the increase of axial pressure, the oxidation activity of coal samples will be enhanced which contributes to the occurrence of low temperature oxidation and spontaneous combustion of coal, it was also found that the increases of fractal dimension, the specific surface area and the thermal conductivity coefficient are the causes for oxidation behavior variance of compacted broken coal.

Key words: compacted broken coal, goaf, stress recover, low-temperature oxidation, spontaneous combustion of coal

中图分类号:

X936

褚廷湘, 韩学锋, 余明高. 承压破碎煤体低温氧化特征与宏观致因分析[J]. 中国安全科学学报, 2019, 29(9): 77-83.

CHU Tingxiang, HAN Xuefeng, YU Minggao. Low-temperature oxidation characteristics of compacted broken coal and macroscopic cause analysis[J]. China Safety Science Journal, 2019, 29(9): 77-83.

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承压破碎煤体低温氧化特征与宏观致因分析

Low-temperature oxidation characteristics of compacted broken coal and macroscopic cause analysis

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