Reference on step conversion of coal gasification and carbocoal combustion is offered by the research on pyrolysis carbocoal.

热解半焦的研究为煤气化及半焦燃烧的分级转化技术提供了参考。

Underground coal gasification is implemented under changefully natural environment which is difficult and complicated to execute,so scientific safety preventive measures should be adopted.

煤炭地下气化是在多变的自然环境中进行的,操作复杂,难度较大,因此,必须采取科学的安全措施。