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Uniqueness of the equilibrium relationship among temperature, pressure and liquid water content in hydrate-bearing soils
Gas Science and Engineering ( IF 5.285 ) Pub Date : 2021-01-23 , DOI: 10.1016/j.jngse.2021.103820
Wenpeng Liang , Jiazuo Zhou , Changfu Wei

The dissociation curves of pore hydrate, conventionally depicted on the P-T plane, depend generally upon the adopted experimental conditions. In this paper, the experimental results are presented on the phase equilibrium conditions for the hydrate-bearing soils (HBS) at different initial water contents, amounts of the dissolvable salt and initial vessel pressures. It is shown that a unique relationship exists between the unhydrated liquid water content and the temperature shift induced by capillary and osmotic effects, if the total amount of the dissolvable salt in the pore water is given. A theoretical model is developed, which can describe a general relationship among pressure, temperature and unhydrated water content for the hydrate-bearing soils in equilibrium. It is shown that the experimental results obtained under different experimental conditions can be very well described by the proposed model. In particular, the new model predicts that, independent of pressure and temperature, the liquid water content can be one-to-one related to the temperature shift to the extent that the total amount of the dissolvable salt is specified. Based on this, a new procedure is proposed to predict the dissociate curves associated with hydrate dissociation under different experimental conditions.



中文翻译:

含水合物土壤中温度,压力和液态水含量之间平衡关系的唯一性

常规上在PT上描绘的孔隙水合物的解离曲线平面,通常取决于所采用的实验条件。本文介绍了在不同初始含水量,可溶盐量和初始容器压力下含水合物土壤(HBS)的相平衡条件下的实验结果。结果表明,如果给出了孔隙水中可溶性盐的总量,则未水合的液态水含量与由毛细管作用和渗透作用引起的温度变化之间存在独特的关系。建立了理论模型,该模型可以描述平衡状态下含水合物土的压力,温度和未含水量之间的一般关系。结果表明,所提出的模型可以很好地描述在不同实验条件下获得的实验结果。特别是,新模型预测,在指定可溶性盐总量的范围内,液态水的含量与温度和温度的变化是一对一的关系,而与压力和温度无关。基于此,提出了一种新的程序来预测在不同实验条件下与水合物解离有关的解离曲线。

更新日期:2021-02-08
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