基于热棒降温技术的自燃煤堆热迁移行为数值模拟
程方明1,3,常助川1,3,李 贝2,3,邓 1,3,易 欣1,3,马 砺1,3

(1.西安科技大学 安全科学与工程学院,陕西 西安 710054; 2.大连理工大学 化工机械与安全学院,辽宁 大连 116086; 3.西安科技大学 西部矿井开采及灾害防治教育部重点实验室,陕西 西安 710054)

煤自燃; 热棒; 数值模拟; 温度等值线; 温度场

Numerical simulation on thermal migration behavior of spontaneous combustion coal pile based on heat pipe cooling technology
CHENG Fang-ming1,3,CHANG Zhu-chuan1,3,LIBei2,3,DENGJun1,3,YIXin1,3,MA Li1,3

(1.College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.School of Chemical Machinery and Safety,Dalian University of Technology,Dalian 116086,China; 3.Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi'an University of Science and Technology,Xi'an 710054,China)

coal spontaneous combustion; heat pipes; numerical simulation; temperature contour; temperature field

DOI: 10.13800/j.cnki.xakjdxxb.2019.0404

备注

为研究热棒作用下煤堆内部传热行为特征及冷却效果,在物理实验基础上,建立了煤堆-热棒系统复合传热模型,采用ANSYS模拟软件,对自燃煤堆在热棒作用下温度场进行数值模拟。通过分析有、无热棒时煤堆内的温度场及温度等值线的变化,对热棒的降温效果进行评价。结果 表明,热棒可以改变煤堆内部的热传导路径,帮助煤堆散热。热棒的存在可以使温度等值线向热端移动,而且越靠近热棒位移量越大,形成包围热棒的“马鞍状”降温模态。根据热棒对松散煤体降温的效果,把热棒的作用范围划分为“敏感区”、“过渡区”、“迟钝区”三区,来有效判断热棒的降温半径,给实际应用中控制热棒的密度提供参考。对比实验和模拟结果,模拟值与实验实测值相近,精度较高。

In order to study the internal thermal migration behavior under the action of Heat Pipe(HP)in coal stockpile,the physical mathematical model of coal stockpile-HP was established on the basis of physical experiment,and the temperature field of spontaneous combustion coal stockpile under the action of HP was numerically simulated by ANSYS simulation software.By analyzing the change of temperature field and temperature contour in coal stockpile with and without HP,the cooling effects of HP was evaluated.The results show that the HP can change the heat conduction path inside the coal stockpile and help the coal stockpile dissipate heat.The existence of a HP can make the temperature contour move toward the high temperature end,and the closer to the HP,the greater the displacement of the temperature contour,thus the final formation of the “saddle” cooling mode which surronds the HP is formed.According to the effects of HP cooling on the coal pile,the cooling range of the HP is divided into three areas:“sensitive area”,“transition area” and “transfer area”,to judge the cooling radius of the HP effectively,which provides a reference for controlling the density of HPs in practice.By comparing the experimental results,it can be seen that the simulated values are close to the experimental measured values with higher precesion.