边界传热条件下甲烷水合物降压分解的LBM模拟  

LBM simulation of depressurization decomposition of methane hydrate under boundary heat transfer

作　　者：张华 梁海峰[1] 邵伟强 张锡彦 ZHANG Hua;LIANG Haifeng;SHAO Weiqiang;ZHANG Xiyan(College of Chemical Engineering and Technology,Taiyuan University of technology,Taiyuan 030024,Shanxi,China)

机构地区：[1]太原理工大学化学工程与技术学院,山西太原030024

出　　处：《天然气化工—C1化学与化工》2022年第4期99-105,共7页Natural Gas Chemical Industry

基　　金：国家自然科学基金青年基金(51106104)。

摘　　要：研究甲烷水合物分解过程的传热机理对其合理开采意义重大。基于Kim-Bishnoi动力学模型,采用格子Boltzmann方法,建立了二维甲烷水合物分解的流体流动模型、传质模型和耦合传热模型,并运用固相更新法追踪甲烷水合物固体的消融。模拟了边界绝热、边界加热条件下水合物分解过程,分析了不同边界温度、孔隙率和水合物赋存状态对产气率、累计产气量和温度的影响。结果表明,边界加热条件下水合物完全分解的产气量为4925 cm^(3),而边界绝热条件下累计产气量仅为边界加热条件下的3/8,需要通过外部提供热量使水合物继续分解;联合降压与边界加热有利于水合物的开采,但是边界温度的升高对提高水合物分解速率效果有限;包裹状态下和孔隙率较大的水合物藏分解更快。Studying the heat transfer mechanism of methane hydrate decomposition process is of great significance for its rational exploitation.Based on the Kim-Bishnoi kinetic model and the Lattice Boltzmann method,the fluid flow model,mass transfer model and coupled heat transfer model of two-dimensional methane hydrate decomposition were established,and the solid phase renewal method was used to track the ablation of methane hydrate solids.The decomposition process of hydrate under boundary adiabatic and boundary heating conditions was simulated,and the effects of different boundary temperature,porosity and hydrate occurrence state on gas production rate,cumulative gas production and temperature were analyzed.The research shows that the total gas production of hydrate decomposition under boundary heating condition is 4925 cm^(3),while the total gas production under boundary adiabatic condition is only 3/8 of that under boundary heating condition,which requires external heat to make hydrate continue to decompose.The combination of depressurization and boundary heating is beneficial to the exploitation of hydrate,but the increase of boundary temperature has limited effect on improving the decomposition rate of hydrate.Hydrate reservoirs with large porosity and wrapped state decompose faster.

关 键 词：甲烷水合物 格子BOLTZMANN方法 模拟 降压分解 传热机理 

分 类 号：TE31[石油与天然气工程—油气田开发工程] P744[天文地球—海洋科学]