Methane ignition by frictional impact heating
Methane ignition by frictional impact heating
复制标题
DOI：
10.1016/0010-2180(75)90080-2
复制
发表时间：
1975-08
影响因子：
4.4
通讯作者：
R. Blickensderfer
中科院分区：
文献类型：
--
作者：
R. Blickensderfer
作为矿务局减少煤矿爆炸危险计划的一部分，对摩擦点火源进行了研究，当采煤机遇到岩层或硬夹杂物时，摩擦点火源会导致甲烷点火。这种金属和岩石之间的碰撞由实验室机器再现，引起了一些点火。提出了一个模型，认为在切向冲击的能量耗散机制。由该模型计算的总能量与实验室机测得的冲击能量吻合较好。计算表明，在剧烈的切向冲击过程中，熔融金属在岩石上沉积，大部分冲击能量在界面处转化为热量，只有约1%的能量用于岩石的去除。岩石上的热污迹有可能点燃甲烷。从模型中考虑了影响热涂片的温度、寿命和面积的变量。根据该模型计算了典型冲击区的冷却曲线，并与实验结果进行了比较。模型计算表明，热面积随撞击速度线性增加，这与实验结果一致，即点火概率随速度增加而增加。该模型是用来预测的氧化热，热的形成，尺寸的工具，和尺寸的岩石上的甲烷点火的效果。
As part of a program conducted by the Bureau of Mines to reduce the explosion hazard in coal mines, a study was made of the frictional ignition source that can develop to cause the ignition of methane when a coal mining machine encounters rock strata or hard inclusions. Such impacts between metal and rock reproduced by a laboratory machine caused a number of ignitions. A model is proposed that considers the mechanisms of energy dissipation during tangential impact. The total energy calculated from the model agrees well with the impact energy measured with the laboratory machine. Calculations show that during severe tangential impact in which a smear of molten metal is deposited on the rock, most of the impact energy is converted into heat at the interface while only about 1% of the energy goes into rock removal. The hot smear on the rock has the potential for igniting methane. The variables that affect the temperature, lifetime, and area of the hot smear are considered from the model. The cooling curve of a typical impact zone is calculated from the model and compares favorably with experimental findings. Calculations from the model show the hot area to increase linearly with impact speed; this agrees with the experimental results of the increasing ignition probability with increasing speed. The model is used to predict the effect of the heat of oxidation, heat of formation, dimensions of the tool, and dimensions of the rock on the ignition of methane.