其主要成分是甲烷，但煤层气中甲烷气体利用率却较低。
Its main composition is methane, but the utilization of methane is low.
随着料高的增加，金属化率不断下降，然而气体利用率却在不断升高。
Metallization degree decreases while utilization degree of gas increases gradually with the height of charge increasing.
温度越高，气体利用率越高，但随着还原时间的增加，差距在逐步缩小；
The higher the reaction temperature, the more the utilization degree of gas, but the difference of utilization degree at various temperatures shortens with time.
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