Temperature field simulation of gob influenced by atmospheric pressure
来源期刊：中南大学学报(英文版)2015年第11期
论文作者：WANG Gang LUO Hai-zhu LIANG Yun-tao WANG Ji-ren
文章页码：4366 - 4371
Key words：gob; atmospheric pressure; numerical simulation; temperature field
Abstract: The current temperature field model of mine gob does not take the boundary conditions of the atmospheric pressureinto account, while the actual atmospheric pressure is influenced by weather, so as to produce differences between ventilation negative pressure of the working face and the negative pressure of gas drainage in gob, thus interfering the calculated results of gob temperature field. According to the characteristics of the actual air flow and temperature change in gob, a two-dimensional temperature field model of the gob was built, and the relational model between the air pressure of intake and outlet of the gob and the atmospheric pressure was established, which was introduced into the boundary conditions of temperature field to conduct calculation. By means of analysis on the simulation example, and comparison with the traditional model, the results indicate that atmospheric pressure change had notable impact on the distribution of gob temperature field. The laboratory test system of gob temperature field was constructed, and the relative error between simulated and measured value was no greater than 9.6%, which verified the effectiveness of the proposed model. This work offers theoretical basis for accurate calculation of temperature and prediction of ignition source in mine gob, and has important implications on preventing spontaneous combustion of coal.
WANG Gang(王刚)1,2, LUO Hai-zhu(罗海珠)2, LIANG Yun-tao(梁运涛)2, WANG Ji-ren(王继仁)1
(1. College of Safety Science and Technology, Liaoning Technical University, Fuxin 123000, China;
2. State Key Laboratory of Coal Safety Technology
(Shenyang Research Institute of China Coal Technology & Engineering Group), Shenyang 110016, China)
Abstract:The current temperature field model of mine gob does not take the boundary conditions of the atmospheric pressureinto account, while the actual atmospheric pressure is influenced by weather, so as to produce differences between ventilation negative pressure of the working face and the negative pressure of gas drainage in gob, thus interfering the calculated results of gob temperature field. According to the characteristics of the actual air flow and temperature change in gob, a two-dimensional temperature field model of the gob was built, and the relational model between the air pressure of intake and outlet of the gob and the atmospheric pressure was established, which was introduced into the boundary conditions of temperature field to conduct calculation. By means of analysis on the simulation example, and comparison with the traditional model, the results indicate that atmospheric pressure change had notable impact on the distribution of gob temperature field. The laboratory test system of gob temperature field was constructed, and the relative error between simulated and measured value was no greater than 9.6%, which verified the effectiveness of the proposed model. This work offers theoretical basis for accurate calculation of temperature and prediction of ignition source in mine gob, and has important implications on preventing spontaneous combustion of coal.
Key words:gob; atmospheric pressure; numerical simulation; temperature field
