Influence of air supply on coal spontaneous combustion during support withdrawal in fully mechanized coal mining and its prevention

Abstract It is necessary to change the air supply rate of the working face during the withdrawal of fully mechanized mining, making it important to study the oxidation characteristics of coal samples under different air supply rates. Through a self-made temperature-programmed experimental device, ou...

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Autores principales:	Xiaowen Zhang, Xihua Zhou, Gang Bai, Cheng Wang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6222619107734045811326ec7858e0ae
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spelling	oai:doaj.org-article:6222619107734045811326ec7858e0ae2021-12-02T18:51:07ZInfluence of air supply on coal spontaneous combustion during support withdrawal in fully mechanized coal mining and its prevention10.1038/s41598-021-98422-w2045-2322https://doaj.org/article/6222619107734045811326ec7858e0ae2021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98422-whttps://doaj.org/toc/2045-2322Abstract It is necessary to change the air supply rate of the working face during the withdrawal of fully mechanized mining, making it important to study the oxidation characteristics of coal samples under different air supply rates. Through a self-made temperature-programmed experimental device, our focus was on studying the change laws of indicator gases released during the low-temperature (303.15–473.15 K) oxidation stage when the air supply rates of the coal samples were 0.67, 1.33, 2, 2.67, and 3.33 mL/s. The experimental results showed that the air supply increased, the concentrations of CO, C2H6, C3H8, C2H4, and C2H2 generated by the coal sample at the same temperature decreased, and the oxidation process decelerated. The initial temperatures of the four hydrocarbon gases were delayed to varying degrees with the increase in the air volume, and C2H4 was found to be more suitable as a hydrocarbon gas for the early warning of coal spontaneous combustion. Surface fitting was applied to analyze the change law of the CO generation rate under the combined effect of temperature and air supply; the change was divided into three stages. The CO concentration model at the upper corner of the working face during the withdrawal period was deduced, and comprehensive safety measures were put forward to prevent coal spontaneous combustion during the withdrawal period.Xiaowen ZhangXihua ZhouGang BaiCheng WangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Xiaowen Zhang Xihua Zhou Gang Bai Cheng Wang Influence of air supply on coal spontaneous combustion during support withdrawal in fully mechanized coal mining and its prevention
description	Abstract It is necessary to change the air supply rate of the working face during the withdrawal of fully mechanized mining, making it important to study the oxidation characteristics of coal samples under different air supply rates. Through a self-made temperature-programmed experimental device, our focus was on studying the change laws of indicator gases released during the low-temperature (303.15–473.15 K) oxidation stage when the air supply rates of the coal samples were 0.67, 1.33, 2, 2.67, and 3.33 mL/s. The experimental results showed that the air supply increased, the concentrations of CO, C2H6, C3H8, C2H4, and C2H2 generated by the coal sample at the same temperature decreased, and the oxidation process decelerated. The initial temperatures of the four hydrocarbon gases were delayed to varying degrees with the increase in the air volume, and C2H4 was found to be more suitable as a hydrocarbon gas for the early warning of coal spontaneous combustion. Surface fitting was applied to analyze the change law of the CO generation rate under the combined effect of temperature and air supply; the change was divided into three stages. The CO concentration model at the upper corner of the working face during the withdrawal period was deduced, and comprehensive safety measures were put forward to prevent coal spontaneous combustion during the withdrawal period.
format	article
author	Xiaowen Zhang Xihua Zhou Gang Bai Cheng Wang
author_facet	Xiaowen Zhang Xihua Zhou Gang Bai Cheng Wang
author_sort	Xiaowen Zhang
title	Influence of air supply on coal spontaneous combustion during support withdrawal in fully mechanized coal mining and its prevention
title_short	Influence of air supply on coal spontaneous combustion during support withdrawal in fully mechanized coal mining and its prevention
title_full	Influence of air supply on coal spontaneous combustion during support withdrawal in fully mechanized coal mining and its prevention
title_fullStr	Influence of air supply on coal spontaneous combustion during support withdrawal in fully mechanized coal mining and its prevention
title_full_unstemmed	Influence of air supply on coal spontaneous combustion during support withdrawal in fully mechanized coal mining and its prevention
title_sort	influence of air supply on coal spontaneous combustion during support withdrawal in fully mechanized coal mining and its prevention
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6222619107734045811326ec7858e0ae
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Influence of air supply on coal spontaneous combustion during support withdrawal in fully mechanized coal mining and its prevention

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