Investigation into Distribution of Three Zones of Spontaneous Combustion in Gob of Fully Mechanized Top-Coal Caving Workface by Means of Numeric Simulation
Study of the Three Zones in gob is important for predicting and preventing spontaneous combustion in coalmine. A dimensionless steady coupled model of air flow diffusion and chemical reaction in loose coal of fully mechanized top-coal caving mining workface (FMTCCMW) is setup. The model is solved numerically to obtain distribution of oxygen concentration and air flue, the three zones which includes heat dissipation zone, self-heating zone and chocking zone of spontaneous combustion is then partitioned in the FMTCCMW gob henceforth. Numeric simulation with varied pressure grade in the workface and oxygen consumption rate of coal shows that as oxygen consumption rate of coal rises, oxygen concentration declines while air leakage intensity almost keeps constant in the gob; as pressure grade in the workfaee increases from 0 Pa, width of self-heating zone in the gob increases first, then attains maximum value and decreases afterward.
fully mechanized top-eoal caving workface spontaneous combustion self-heating zone numerical simulation
ZHANG Xinhai
Energy and Power School,Xi an Jiaotong University,Xian 710049,Shaanxi,China Xian University of Science and Technology,Xian 710054,Shaanxi,China
国际会议
The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)
北京
英文
1430-1434
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）