煤线(coal streak，shed coal)是指在剖面上出露的极薄的煤层。煤线可以是原生的，也可以是由于煤层露头受风化，大部分物质被剥蚀，以致煤层厚度变得很薄而成的。
论述了顶煤介质状态转化对工作面支架的作用，不同强度顶煤在工作面控顶区上方的性态分布和放顶煤线处的垮落特点；
The loading affection on supports in process of transformation. the roof coal behaviour on the face zone and its caving character at cavity edge are expounded.
利用流程模拟得到的装置模型，对常压塔常一线航煤进行离线操作优化，达到航煤产量最大化的目标。
With the draw ratio of aviation kerosene as the optimization objective, off-line operating optimization has been done by the plant model of process simulation.
针对燃料煤输送带运输线，设计了燃料煤运输线的P LC控制系统，分析了控制系统的各个组成部分。
In this paper, PLC control system of fuel coal transportation network is designed and each part of the control system is analyzed.
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