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Targeted inertization with flue gas injection in fully mechanized caving gob for residual coal spontaneous combustion prevention with CFD modeling
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-08-30 , DOI: 10.1002/ese3.789 Ge Huang 1 , Jiren Wang 1 , Fengwei Dai 1 , Cunbao Deng 2
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-08-30 , DOI: 10.1002/ese3.789 Ge Huang 1 , Jiren Wang 1 , Fengwei Dai 1 , Cunbao Deng 2
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To effectively prevent and control the spontaneous combustion of residual coal at the bottom of a large fully mechanized gob space, we proposed a targeted inertization technology based on the injection of power plant flue gas. Based on the real onsite conditions of the gob, the three‐dimensional distributions of the overburden fractures, gas emission, and residual coal were added to the multiphysics coupled model of spontaneous coal combustion. The simulation method based on moving coordinates was used to complete the risk evaluation and the locating of the spontaneous combustion in the fully mechanized gob, and the key control factors of the inerted zone and the fire prevention effect of the flue gas injection were analyzed. The results showed that the mismatch between the inerted zone and the spontaneous combustion risk zone was the root cause of the poor fire prevention effect of the inert gas injection. Because the density of the flue gas was greater than that of the leaked air, the flue gas mainly migrated and diffused in the lower part of the gob. At a distance of 100 m from the working face, the flue gas with 3%‐9% oxygen content injected at a rate of 2000 m3/h completely covered the high‐temperature residual coal. This caused the maximum temperature (Tmax) to drop from 334.2 K upon nitrogen injection to below 310 K. Additionally, the effect of the oxygen content fluctuation on Tmax was controlled within 2.6 K. The methods and the results in this study can serve as a reference for efficiently preventing and controlling local spontaneous combustion hazards in large spaces for underground coal mining.
中文翻译：
利用CFD模型进行综放采空区烟气定向惰性注入防止煤自燃的研究。
为了有效防止和控制大型综采空间底部的残留煤自燃，我们提出了一种基于电厂烟气注入的有针对性的惰性化技术。根据采空区的实际情况，将覆盖层裂缝，瓦斯释放和残余煤的三维分布添加到自燃煤的多物理场耦合模型中。运用基于移动坐标的模拟方法，完成了风险评估，对采空区自燃的定位进行了分析，分析了惰化区关键控制因素和烟道气注入的防火效果。结果表明，惰性区与自燃危险区之间的不匹配是惰性气体注入防火效果差的根本原因。因为烟道气的密度大于泄漏的空气的密度，所以烟道气主要在料滴的下部迁移和扩散。在距工作面100 m处，以2000 m的速率注入含氧量为3％-9％的烟道气3 / h完全覆盖了高温残留煤。这导致最高温度（T max）从注氮时的334.2 K降至310 K以下。此外，氧含量波动对T max的影响控制在2.6 K以内。本研究的方法和结果可为作为有效预防和控制地下煤矿开采大空间局部自燃危险的参考。
更新日期：2020-08-30
中文翻译：
利用CFD模型进行综放采空区烟气定向惰性注入防止煤自燃的研究。
为了有效防止和控制大型综采空间底部的残留煤自燃，我们提出了一种基于电厂烟气注入的有针对性的惰性化技术。根据采空区的实际情况，将覆盖层裂缝，瓦斯释放和残余煤的三维分布添加到自燃煤的多物理场耦合模型中。运用基于移动坐标的模拟方法，完成了风险评估，对采空区自燃的定位进行了分析，分析了惰化区关键控制因素和烟道气注入的防火效果。结果表明，惰性区与自燃危险区之间的不匹配是惰性气体注入防火效果差的根本原因。因为烟道气的密度大于泄漏的空气的密度，所以烟道气主要在料滴的下部迁移和扩散。在距工作面100 m处，以2000 m的速率注入含氧量为3％-9％的烟道气3 / h完全覆盖了高温残留煤。这导致最高温度（T max）从注氮时的334.2 K降至310 K以下。此外，氧含量波动对T max的影响控制在2.6 K以内。本研究的方法和结果可为作为有效预防和控制地下煤矿开采大空间局部自燃危险的参考。
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