煤炭自被发现后,就给人类带来了光明和幸福,被称为天然的地下火种或乌金。在国民经济建设中,煤炭占有重要地位。它是工业的主要燃料和动力源泉之一,是化学工业的重要原料,是发展工业、农业和交通运输业的一个重要条件,是人民生活不可缺少的燃料。煤是由距今大约几亿年前的植物埋于地下变成的,能燃烧的部分由植物变化而成,不能燃烧的部分 Since its discovery, coal has brought brightness and happiness to humankind and is known as a natural underground fire or black gold. In the national economy, coal occupies an important position. It is one of the major sources of fuel and power for industry. It is an important raw material for the chemical industry. It is an important condition for the development of industry, agriculture and transportation. It is an indispensable fuel for people’s livelihood. Coal is buried in the ground by plants hundreds of millions of years ago, and the part that can be burned is a change from plant to part that can not be burnt