In general, all of these coal types can be burned on a given unit at the same combustion heat release.

总的来说，等量的这些煤在燃烧时散发的热量是相等的。

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The varying law of the final volatile yield of 18 different coal types was studied at different heating rates by thermobalance.

采用热天平在不同的升温速率下对18种煤的最终挥发分产量的变化规律进行了研究。

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Trial grinding of coal types constitutes a relatively reliable method for the selection of fan mills and the design of coal pulverizing systems.

采用煤种的试磨方法是风扇磨选型和制粉系统设计较为可靠的方法。

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Meanwhile, America has recently reversed a steady decline in domestic gas production, thanks to new technology that allows firms to tap previously inaccessible gas trapped in coal, shale and some types of sandstone.

ECONOMIST: Liquefied natural gas