Distribution of spontaneous combustion three zones and optimization of nitrogen injection location in the goaf of a fully mechanized top coal caving face.

In order to effectively prevent and control spontaneous combustion of residual coal in the goaf and reduce the waste of nitrogen caused by setting the position of nitrogen injection, 1303 fully mechanized coal caving faces of the Jinniu Mine are studied. By deploying a bundle tube monitoring system...

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Autores principales:	Yun Qi, Wei Wang, Qingjie Qi, Zhangxuan Ning, Youli Yao
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6a884bc961ae418f84834547e0358f7d
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spelling	oai:doaj.org-article:6a884bc961ae418f84834547e0358f7d2021-12-02T20:14:30ZDistribution of spontaneous combustion three zones and optimization of nitrogen injection location in the goaf of a fully mechanized top coal caving face.1932-620310.1371/journal.pone.0256911https://doaj.org/article/6a884bc961ae418f84834547e0358f7d2021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0256911https://doaj.org/toc/1932-6203In order to effectively prevent and control spontaneous combustion of residual coal in the goaf and reduce the waste of nitrogen caused by setting the position of nitrogen injection, 1303 fully mechanized coal caving faces of the Jinniu Mine are studied. By deploying a bundle tube monitoring system in the inlet air side and return air side of the goaf, changes in gas concentration in the goaf are continuously monitored. In addition, the distribution area for spontaneous combustion three-zone in the goaf is divided into heat dissipation zone, oxidized spontaneous combustion zone, and suffocation zone. Simulations from the COMSOL Multiphysics 5.3 software provide insight based on the three zones division standard of spontaneous combustion in the goaf. The gradual deepening of the nitrogen injection position into the goaf affects the lower limit of the oxidized spontaneous combustion zone significantly, but the impact on the upper limit of the oxidized spontaneous combustion zone is not obvious and is negligible. With regard to the width of the oxidized spontaneous combustion zone, it initially decreases followed by a gradual increase. Numerical calculations suggest the optimal nitrogen injection position is 40 m from the roof cutting line, with an oxidized spontaneous combustion zone width of 28 m. Based on the simulation analysis results, nitrogen injection controlling measures have been adopted for spontaneous combustion of residual coal in the goaf of the 1303 fully mechanized coal caving faces, and coal self-ignition in the goaf has been successfully extinguished.Yun QiWei WangQingjie QiZhangxuan NingYouli YaoPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 9, p e0256911 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yun Qi Wei Wang Qingjie Qi Zhangxuan Ning Youli Yao Distribution of spontaneous combustion three zones and optimization of nitrogen injection location in the goaf of a fully mechanized top coal caving face.
description	In order to effectively prevent and control spontaneous combustion of residual coal in the goaf and reduce the waste of nitrogen caused by setting the position of nitrogen injection, 1303 fully mechanized coal caving faces of the Jinniu Mine are studied. By deploying a bundle tube monitoring system in the inlet air side and return air side of the goaf, changes in gas concentration in the goaf are continuously monitored. In addition, the distribution area for spontaneous combustion three-zone in the goaf is divided into heat dissipation zone, oxidized spontaneous combustion zone, and suffocation zone. Simulations from the COMSOL Multiphysics 5.3 software provide insight based on the three zones division standard of spontaneous combustion in the goaf. The gradual deepening of the nitrogen injection position into the goaf affects the lower limit of the oxidized spontaneous combustion zone significantly, but the impact on the upper limit of the oxidized spontaneous combustion zone is not obvious and is negligible. With regard to the width of the oxidized spontaneous combustion zone, it initially decreases followed by a gradual increase. Numerical calculations suggest the optimal nitrogen injection position is 40 m from the roof cutting line, with an oxidized spontaneous combustion zone width of 28 m. Based on the simulation analysis results, nitrogen injection controlling measures have been adopted for spontaneous combustion of residual coal in the goaf of the 1303 fully mechanized coal caving faces, and coal self-ignition in the goaf has been successfully extinguished.
format	article
author	Yun Qi Wei Wang Qingjie Qi Zhangxuan Ning Youli Yao
author_facet	Yun Qi Wei Wang Qingjie Qi Zhangxuan Ning Youli Yao
author_sort	Yun Qi
title	Distribution of spontaneous combustion three zones and optimization of nitrogen injection location in the goaf of a fully mechanized top coal caving face.
title_short	Distribution of spontaneous combustion three zones and optimization of nitrogen injection location in the goaf of a fully mechanized top coal caving face.
title_full	Distribution of spontaneous combustion three zones and optimization of nitrogen injection location in the goaf of a fully mechanized top coal caving face.
title_fullStr	Distribution of spontaneous combustion three zones and optimization of nitrogen injection location in the goaf of a fully mechanized top coal caving face.
title_full_unstemmed	Distribution of spontaneous combustion three zones and optimization of nitrogen injection location in the goaf of a fully mechanized top coal caving face.
title_sort	distribution of spontaneous combustion three zones and optimization of nitrogen injection location in the goaf of a fully mechanized top coal caving face.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/6a884bc961ae418f84834547e0358f7d
work_keys_str_mv	AT yunqi distributionofspontaneouscombustionthreezonesandoptimizationofnitrogeninjectionlocationinthegoafofafullymechanizedtopcoalcavingface AT weiwang distributionofspontaneouscombustionthreezonesandoptimizationofnitrogeninjectionlocationinthegoafofafullymechanizedtopcoalcavingface AT qingjieqi distributionofspontaneouscombustionthreezonesandoptimizationofnitrogeninjectionlocationinthegoafofafullymechanizedtopcoalcavingface AT zhangxuanning distributionofspontaneouscombustionthreezonesandoptimizationofnitrogeninjectionlocationinthegoafofafullymechanizedtopcoalcavingface AT youliyao distributionofspontaneouscombustionthreezonesandoptimizationofnitrogeninjectionlocationinthegoafofafullymechanizedtopcoalcavingface
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Distribution of spontaneous combustion three zones and optimization of nitrogen injection location in the goaf of a fully mechanized top coal caving face.

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