Analysis of heat transfer effects on gas production from methane hydrate by depressurization
Analysis of heat transfer effects on gas production from methane hydrate by depressurization
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DOI：
10.1016/j.ijheatmasstransfer.2014.05.034
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发表时间：
2014-10
影响因子：
5.2
通讯作者：
Jiafei Zhao;Di Liu;Mingjun Yang;Yongchen Song
中科院分区：
文献类型：
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作者：
Jiafei Zhao;Di Liu;Mingjun Yang;Yongchen Song
天然气水合物的分解是一个吸热过程。这种分解过程需要从沉积物和孔隙流体中持续吸收热能。这种热传递控制分解速率并影响气体产生。在这项研究中，一个二维轴对称模拟器的开发，模拟多孔介质中的水合物分解过程中的降压传热的影响。进行了一系列模拟研究显热对沉积物的影响，在帽和基沉积物中的热流传输，以及传导和对流传热对甲烷水合物降压产气的影响。结果表明，多孔介质材料和含水量是影响天然气水合物分解显热的两个重要因素：多孔介质材料可以促进甲烷水合物的分解，而水通过影响沉积物内部的压力来抑制甲烷水合物的分解过程。沉积物的高导热性最初可以积极影响水合物分解，但随后可能部分抑制该过程。与水流相比，气流中的对流传热显著地促进了水合物的分解。
The dissociation of natural gas hydrates is an endothermic process. This dissociation process requires the continuous absorption of heat energy from the sediment and pore fluid. This heat transfer governs the dissociation rate and affects gas production. In this study, a two-dimensional axisymmetric simulator is developed to model the effects of heat transfer on the process of hydrate dissociation in porous media by depressurization. A series of simulations are performed to study sensible heat effects on the sediment, heat flow transfer in the cap- and base-sediment, and the effects of conductive and convective heat transfer on gas production from methane hydrate depressurization. The results show that the porous media material and the water content are two significant factors that affect the sensible heat in gas hydrate dissociation: the porous media material can increase methane hydrate dissociation, but water inhibits the dissociation process by affecting the pressure on the inner sediment. A high thermal conductivity of the sediment can initially positively affect hydrate dissociation but may later partially inhibit the process. Convective heat transfer in the gas flow increases hydrate dissociation markedly compared to that in water flow.