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Influence of the permeability of the coal plastic layer on coking pressure

机译：煤塑料层渗透性对焦化压力的影响

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摘要

Ten coals of different rank and coking pressure characteristics were chosen in order to study the time of occurrence of the phenomena that take place during the coking of a coal and the way they affect the generation of dangerous coking pressures. Parameters derived from thermoplastic, thermogravimetric and permeability tests were studied together with semicoke contraction and the coking pressure generated by the coals in a movable wall oven. It was found that for safe coals, the maximum evolution of volatile matter occurs near the temperature of maximum fluidity. The position of the maximum rate of volatile matter evolution with respect to the zone of low permeability varies depending on the coking pressure characteristics of the coals. In addition, the relationship between the period of low permeability to the resolidification temperature may serve to indicate the degree of dangerousness of a coal. The fissure pattern of the semicoke was found to be related to the coking pressure and semicoke contraction.
机译：选择十种不同等级和焦化压力特性的煤，以研究煤焦化过程中现象发生的时间以及它们对危险焦化压力产生的影响。研究了由热塑性，热重和渗透性测试得出的参数，以及半焦炭收缩和可移动壁式烤箱中煤产生的焦化压力。发现对于安全煤，挥发性物质的最大释放发生在最大流动性温度附近。相对于低渗透率区域，最大挥发物释放速率的位置根据煤的焦化压力特性而变化。另外，低渗透性的时间段与再凝固温度之间的关系可以用来指示煤的危险程度。发现半焦的裂缝模式与焦化压力和半焦收缩有关。

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