For example, a steam engine can use coal, newspaper or wood for the fuel, while an internal combustion engine needs pure, high-quality liquid or gaseous fuel.

例如，蒸汽发动机可以用煤，报纸或木头作为燃料，而内燃机需要用纯的，高质量液体燃料或气体燃料。

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Using the exergy analysis method, the conception of energy quality character was presented, which indicated the discretion of electricity, gas, coal, steam and hot water, cooling or heating load etc.

基于热力学第二定律的分析方法，按照能质系数的概念确定了电、天然气、煤、蒸汽、热水等各种形式的建筑用能及建筑物耗冷量、耗热量的能源品位高低；

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The coal washing plant steam boiler drum diameter is larger than other boiler manufacturers, stable output, high quality steam.

水洗厂燃煤蒸汽锅炉锅筒直径比其他锅炉厂家大，运行稳定出力足，蒸汽品质高。

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