Upscaling Methane Hydrate Dissociation Kinetic Model during Depressurisation
Upscaling Methane Hydrate Dissociation Kinetic Model during Depressurisation
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DOI：
10.1016/j.ces.2023.118742
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发表时间：
2023-04
影响因子：
4.7
通讯作者：
Junyu Yang;Qianghui Xu;Zhiying Liu;Lin Shi;Timan Lei;K. Luo
中科院分区：
文献类型：
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作者：
Junyu Yang;Qianghui Xu;Zhiying Liu;Lin Shi;Timan Lei;K. Luo
在目前的工作中，孔隙尺度的数值模拟甲烷水合物分解减压进行分解速率上的传热和传质的影响进行分析放大的动力学模型在代表性单元体积（REV）规模。质量传递限制表明水合物分解倾向于发生在气相附近。引入有效反应表面积来测量气体和水迁移过程中暴露于气相的水合物表面，并将其建模为局部水合物和水饱和度以及水合物孔隙习性的函数。由于局部热平衡，热输运限制用单温度模型计算。与孔隙尺度模拟相比，建议的REV尺度动力学模型预测的解离速率的相对误差小于10%，这有望提高水合物采收率预测的精度。
In the present work, a pore-scale numerical simulation of methane hydrate dissociation by depressurisation is conducted to analyze the effect of heat and mass transfer on the dissociation rate for scaling up the kinetic model at the representative element volume (REV) scale. The mass transport limitation shows that the hydrate dissociation preferred to occur near the gas phase. The effective reaction surface area is introduced to measure the exposed hydrate surface to the gas phase during gas and water migration and is modelled as a function of local hydrate and water saturation and hydrate pore habits. Heat transport limitation is computed with the one-temperature model due to the local thermal equilibrium. Compared to the pore-scale simulation, the proposed REV-scale kinetic model predicts dissociation rates with a relative error of less than 10%, which is expected to increase the precision of the hydrate recovery forecast.