随着煤层埋藏深度增大矿山地质条件和矿山技术条件变坏,无矿井方法或者钻孔方法采煤变得更加迫切了。实现钻孔方法采煤的一个必要的工序就是将煤层被开采区段的煤变为易运输状态。这种变换的可能途径之一是向煤层压入各种化学物质,对煤层施加物理场,主要是温场的作用。由于化学变化的结果煤可能变为气相,液相,或者变为能通过钻孔吸出的粉煤。建立在压送化学物质基础上的转化方法分为固有的化学法,采用这种方法煤炭的有机成分或者矿物部分的化学成分产生大量的变化;和物理化学方法,采用这种方法煤炭成分本质不变。采用化学反应时所获得的机械能的方法,例如液体炸药爆炸,应该属于物理一力学方法。 地下气化得到了一定的应用。进行煤炭液化的化学方法就是氢化和破坏性溶解。为了实现氢化必须在煤层中造成极高的热动力参数成者应用多相催化剂,而这是很复杂的。破坏性溶解的产品需要进一步的深度化 With the increase of burial depth of coal seams, the geological conditions of mines and the deterioration of technical conditions of mines have made it more urgent to mine without mines or drilling methods. One of the necessary steps to realize the drilling method of coal mining is to change the coal in the mining section of the coal seam into an easy-to-transport state. One of the possible ways of this transformation is to press various chemical substances into the coal seam and exert the physical field on the coal seam, mainly the effect of the temperature field. As a result of chemical changes, the coal may become gaseous, liquid, or become pulverized coal that can be aspirated through the borehole. Conversion methods based on pressured chemical delivery are divided into inherent chemical methods by which a large number of changes occur in the chemical composition of the organic or mineral part of the coal and physicochemical methods by which the nature of the coal component change. Mechanical energy obtained by chemical reaction methods, such as liquid explosives, should belong to the physical and mechanical methods. Underground gasification has been a certain application. The chemical method of coal liquefaction is hydrogenation and destructive dissolution. This is complicated by the fact that heterogeneous catalysts must be used to create extremely high thermodynamic parameters in the coal seam in order to achieve hydrogenation. Destructive dissolution of the product requires further depth