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首页> 外文期刊>International Journal of Mechanical Engineering Education >Addendum: Application of the phase rule to natural gas hydrates
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Addendum: Application of the phase rule to natural gas hydrates

机译：附录：相规则在天然气水合物中的应用

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摘要

Reference [1] contains inter alia estimates of the energy-return-on-energy-invested (EROEI) for methane from natural gas hydrates and makes use of the phase rule in so doing. In application of the phase rule, the number of components is taken to be one: methane only. The number of phases is taken to be two: methane in the gas phase and that in the ice structure. A reader might well have wondered whether the system ought to be treated as a two-component one given the presence of the ice, and this point has exercised the author's own mind. He has given the matter further thought and is 'reporting back' to the journal for the benefit of readers. Treatment of the hydrate as single component is justifiable on the grounds that water is for practical purposes absent from the gas phase: the pressure of water vapour in equilibrium with the ice will be minuscule in comparison with the pressure of the methane gas. The ice structure therefore merely constitutes the surroundings of the methane molecules it contains and does not feature in phase equilibrium considerations.
机译：参考文献[1]尤其包含对天然气水合物中甲烷的能量投资的能量回报（EROEI）的估算，并在此过程中利用了相线法则。在应用相规则时，将组分数设为一个：仅甲烷。相数取为两个：气相中的甲烷和冰结构中的甲烷。读者可能很想知道，考虑到冰层的存在，该系统是否应该被视为一个由两个部分组成的系统，这一点已经发挥了作者的思想。他对此事作了进一步的考虑，并正在“报告”该期刊，以使读者受益。将水合物作为单一组分处理是合理的，因为气相实际上没有水用于实际用途：与甲烷平衡的水蒸气与冰平衡的压力将很小。因此，冰结构仅构成其所包含的甲烷分子的周围环境，并且不存在于相平衡方面。

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