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Study of the influence of the characteristics of loose residual coal on the spontaneous combustion of coal gob
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2019-11-11 , DOI: 10.1002/ese3.542 Nan Li 1 , Xuelong Li 2, 3 , Cai Shu 2 , Wenlong Shen 4 , Miao He 5 , Jingjing Meng 6
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2019-11-11 , DOI: 10.1002/ese3.542 Nan Li 1 , Xuelong Li 2, 3 , Cai Shu 2 , Wenlong Shen 4 , Miao He 5 , Jingjing Meng 6
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Mine fires are becoming a serious issue as the intensity of mining increases, especially in deep mines. Loose coal gob has a hidden ignition location and a high possibility of spontaneous combustion, which makes fire prevention difficult. Therefore, based on the theory of gas seepage and the characteristics of loose coal, a model of air leakage and spontaneous combustion in gob is established in this paper. Using working face #10414 in the Yangliu coal mine as an example, the relationship between the three spontaneous coal combustion (CSC) zones and the three stress zones is analyzed and verified by combining a FLAC3D simulation with field monitoring. In addition, the influence of advancing speed on the CSC is discussed, and suggestions for fire prevention are presented. The results show that the variation in the calorific value of the CSC with increasing degree of looseness of the residual coal in the gob forms an arch‐shape. There is a one‐to‐one relationship between the distribution of the three stress zones and the three CSC zones. In addition, as the advancing speed increases, the contact time between the loose coal body and the air decreases and the possibility of CSC decreases. This study provides a scientific basis for fire prevention and control in mines.
中文翻译：
松散残煤特性对采空区自燃影响的研究
随着采矿强度的增加，尤其是在深部矿山中，矿井火灾正成为一个严重的问题。松散的煤料具有隐蔽的着火点，并且自燃的可能性很高，这使得防火很困难。因此，基于瓦斯渗流理论和松散煤的特征，建立了采空区漏风和自燃模型。以杨柳煤矿＃10414工作面为例，结合FLAC3D模拟与现场监测，对三个自燃区（CSC）与三个应力区之间的关系进行了分析和验证。此外，讨论了前进速度对CSC的影响，并提出了防火建议。结果表明，随着采空区内残存煤松散度的增加，CSC的热值变化呈弧形。三个应力区和三个CSC区的分布之间存在一对一的关系。另外，随着前进速度的增加，松散的煤体与空气之间的接触时间减少并且CSC的可能性降低。该研究为矿山火灾的预防和控制提供了科学依据。
更新日期：2019-11-11
中文翻译：
松散残煤特性对采空区自燃影响的研究
随着采矿强度的增加，尤其是在深部矿山中，矿井火灾正成为一个严重的问题。松散的煤料具有隐蔽的着火点，并且自燃的可能性很高，这使得防火很困难。因此，基于瓦斯渗流理论和松散煤的特征，建立了采空区漏风和自燃模型。以杨柳煤矿＃10414工作面为例，结合FLAC3D模拟与现场监测，对三个自燃区（CSC）与三个应力区之间的关系进行了分析和验证。此外，讨论了前进速度对CSC的影响，并提出了防火建议。结果表明，随着采空区内残存煤松散度的增加，CSC的热值变化呈弧形。三个应力区和三个CSC区的分布之间存在一对一的关系。另外，随着前进速度的增加，松散的煤体与空气之间的接触时间减少并且CSC的可能性降低。该研究为矿山火灾的预防和控制提供了科学依据。
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