应用MRI研究CO2在癸烷中的扩散

doi:10.11938/cjmr20150304

波谱学杂志 ›› 2015, Vol. 32 ›› Issue (3): 430-438.doi: 10.11938/cjmr20150304

应用MRI研究CO₂在癸烷中的扩散

郝敏^1,2*，赵越超²，毛云峰³，宋永臣²

1. 沈阳化工大学能源与动力学院，辽宁沈阳 110142; 2. 大连理工大学海洋能源利用与节能教育部重点实验室，辽宁大连 116024； 3. 青海油田格尔木炼油厂，青海格尔木 816000

收稿日期:2014-05-22 修回日期:2015-07-28 出版日期:2015-09-05 发布日期:2015-09-05
作者简介:郝敏(1977-)，女，辽宁锦州人，博士研究生，讲师，主要从事注气提高石油采收率技术方面的研究. 电话：13898127191, E-mail: cnhaomin@163.com.
基金资助:
国家自然科学基金资助项目(51206018)，辽宁省博士启动基金资助项目(20121022)

Diffusion of CO₂ in Decane Studied by Magnetic Resonance Imaging

HAO Min^1,2*，ZHAO Yue-chao²，MAO Yun-feng³，SONG Yong-chen²

1. School of Energy and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China; 2. Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian 116024, China; 3. Qinghai Oilfield Golmud Refinery, Golmud 816000, China

Received:2014-05-22 Revised:2015-07-28 Online:2015-09-05 Published:2015-09-05
About author:*Corresponding author：HAO Min, Tel: +86-13898127191, E-mail: cnhaomin@163.com
Supported by:
国家自然科学基金资助项目(51206018)，辽宁省博士启动基金资助项目(20121022)

摘要/Abstract

摘要：

应用核磁共振成像(MRI)技术可视化研究CO₂在癸烷中的扩散，在MRI系统采集图像的同时，应用双室压力衰减法（PVT法）监测压力，通过对MRI图像进行信号强度分析，可得到CO₂的无量纲浓度分布，然后基于菲克定律应用有限体积法可计算得出与扩散距离和扩散时间有关的扩散系数，并可得到任意扩散时间范围内的整体平均扩散系数，MRI方法得出的扩散平衡时间范围内的整体平均扩散系数与PVT法相比较误差为2.7%，并且与相似条件下的前人实验结论具有相同的数量级(10^–9)．根据实验结果得出，扩散系数沿扩散方向下降且随时间以指数形式降低，整体平均扩散系数随扩散时间的增加而减小．

关键词: 磁共振成像(MRI), 扩散, 传质, 癸烷, CO₂

Abstract:

Magnetic resonance imaging (MRI) was used to visualize the diffusion of CO₂ in decane, while the pressure was monitored via a double-chamber pressure decay method (PVT). The signal intensities on the MRI images were analyzed to reveal the distribution of dimensionless CO₂ content. Based on Fick's law, we computed the diffusion coefficient related to diffusion time and diffusion distance using the finite volume method. The overall average diffusion coefficient can be obtained at any diffusion time. Comparing the overall average diffusion coefficient obtained by the MRI method during diffusion equilibrium time with that obtained by the PVT method showed a 2.7% error. The diffusion coefficient decreased along the diffusing direction, and declined exponentially with time. The overall average diffusion coefficient decreased with the extension of diffusion time. The results obtained in this study were comparable to previous results obtained under similar experimental conditions.

Key words: MRI, diffusion, mass transfer, decane, CO₂

中图分类号:

O482.53

郝敏1,2*，赵越超2，毛云峰3，宋永臣2. 应用MRI研究CO₂在癸烷中的扩散[J]. 波谱学杂志, 2015, 32(3): 430-438.

HAO Min1,2*，ZHAO Yue-chao2，MAO Yun-feng3，SONG Yong-chen2. Diffusion of CO₂ in Decane Studied by Magnetic Resonance Imaging[J]. Chinese Journal of Magnetic Resonance, 2015, 32(3): 430-438.

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应用MRI研究CO₂在癸烷中的扩散

Diffusion of CO₂ in Decane Studied by Magnetic Resonance Imaging

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