根据中国天然气组分变化的情况，研究了天然气组分变化时，燃料的低热值、理论空燃比和燃烧势等燃烧参数的变化；
The variations of lower heating value, theoretical air fuel ratio and combustion potential of natural gas fuel were investigated according to the variation of natural gas composition in China.
煤矸石和含甲烷量较低的煤层气均属于低热值的燃料。
Both coal gangue and coal bed methane are low heating value fuels.
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