埋藏和温度增高导致的物理变化和化学变化称为煤化作用。
Burial and increase in temperature bring about physical and chemical changes called coalification.
我国煤层气在成煤和煤化作用地质条件与美国有差异，勘探开发有一定特殊性。
Exploration and development of coal-bed methane in China has its particularity for its geological conditions of coal-forming process and coalification are different from the US.
本文主要研究一些金属化合物对煤燃烧的催化作用。
Catalytic effects of metallic compounds on coal combustion are studied in this paper.
焦化作用是将煤转化为焦炭的热处理过程，涉及到将煤在焦炭炉中隔绝空气高温加热数小时。
Carbonisation is the thermal process for the conversion of coal into coke, involving heating coal at high temperature for many hours in the absence of air whilst contained in ovens.
构造煤形成过程中，由于芳构化作用，稠合芳烃系列化合物含量增加，但又伴随裂解作用。
In the process of deformed-coal, a series compound of condensed aromatics grow in quantity with splitting actin under the aromatization.
构造煤形成过程中，由于芳构化作用，稠合芳烃系列化合物含量增加，但又伴随裂解作用。
In the process of deformed-coal, a series compound of condensed aromatics grow in quantity with splitting actin under the aromatization.
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