收稿日期: 2011-02-22
修回日期: 2011-05-09
网络出版日期: 2011-10-10
基金资助
国家自然科学基金（编号:41001038）；中国科学院西部行动计划项目(编号:KZCX2-XB3-03);中国科学院寒区旱区环境与工程研究所青年基金（编号:59Y084831）;冻土工程国家重点实验自主研究课题（编号:52O9SF10D）;国家自然科学基金委基础科学人才培养基金冰川学冻土学特殊学科点（编号:J0930003/J0109）联合资助.
The Effects of Cooling Rate and Particle Size of Medium to the Formation of Methane hydrate in Sands
Received date: 2011-02-22
Revised date: 2011-05-09
Online published: 2011-10-10
为研究降温速率和多孔介质粒径对天然气水合物形成过程的影响，在2种不同粒径的砂土中开展了甲烷水合物的形成实验研究。5个不同的降温速率被应用到2种粒径砂土中甲烷水合物的形成实验。实验结果表明，降温速率对砂土中甲烷水合物的成核时间有明显的影响。降温速率越快，甲烷水合物所需的成核时间就越短。同时，降温速率越慢，甲烷气体形成甲烷水合物的气体转化率就越高。不同的降温速率也影响形成实验中降温阶段和恒温阶段的甲烷水合物形成情况。在较低的降温速率下，恒温阶段的气体转化率相对较少。不同的多孔介质对甲烷水合物的形成过程也具有明显的影响。相对来说，在相同条件下，甲烷水合物在粗砂土中比在细砂土中更容易形成；在粗砂土中形成甲烷水合物，其气体转化率比在细砂土中形成的甲烷水合物更高。
蒋观利,吴青柏,展静 . 降温速率和粒径对砂土中甲烷水合物形成过程影响研究[J]. 天然气地球科学, 2011 , 22(5) : 920 -925 . DOI: 10.11764/j.issn.1672-1926.2011.05.920
For study the effects of cooling rate and particle size of medium to the formation of natural gas hydrate, we conduct the formation experiments of methane hydrate in fine and coarse sands.Five cooling rates are applied to the formation processes.The result shows that the cooling rate affects the nucleation time of methane hydrate in coarse sand obviously.The faster the cooling rate, the shorter the nucleation time.Meanwhile, the slower the cooling rate, the higher the methane gas conversion rate.And the cooling rate also affects the formations both in cooling process and constant temperature process.Under a slower cooling rate, the methane gas conversion rate in constant temperature process is relatively small.Different medium has obvious effect to the formation of methane hydrate within it.Relatively, under same conditions, methane hydrate forms easier in coarse sand than in fine sand; and the gas conversion rate in coarse sand is higher than that in fine sand.
［1］Sloan E D.Clathrate Hydrates of Natural Gas:Second Edition［M］.New York: Marcel Bekker Inc., 1990:458-466.
［2］Uchida T, Ebinuma T, Takeya S, et al.Effects of pore sizes on dissociation temperatures and pressures of methane, carbon dioxide and propane hydrate in porous media［J］.J.Phys.Chem.B., 2002,106:820-826.
［3］Tohidi B, Burgass R W, Danesh A, et al.Improving the accuracy of gas hydrate dissociation point measurements［J］.Ann.N.Y.Acad.Sci., 2000, 912:924-931.
［4］Li Gang, Li Xiaosen, Tang Liangguang, et al.Experimental study on the effect of temperature cooling profile on methane hydrate formation［J］.The Chinese Journal of Process Engineering, 2007,7(4):723-726.［李刚，李小森，唐良广，等.降温模式对甲烷水合物形成的影响［J］.过程工程学报，2007,7(4):723-726.］
［5］Zhang Peng, Wu Qingbai, Wang Yingmei.Water characteristics inside loess during formation and dissociation processes of methane hydrate［J］.Natural Gas Geoscience, 2009,20(4):616-619.［张
[HJ]鹏, 吴青柏, 王英梅.粉土内甲烷水合物形成与分解过程中的水分特征［J］.天然气地球科学,2009,20(4):616-619.］
［6］Buchanan P, Soper A K, Thompson H, et al.Search for memory effects in methane hydrate: Structure of water before hydrate formation and after hydrate decomposition［J］.Journal of Chemical Physics, 2005,123:164507-164513.
［7］CSMGem.Hydrate Prediction Program, Center for Hydrate Research
[R].Colorado School of Mines, 2001.
［8］Zatsepina O Y, Buffett B A.Nucleation of gas hydrate in marine environments［J］.Geophys.Res.Lett., 2003, 30(9):1451-1545.
［9］Barth G A.Methane Gas Volume Expansion Ratios and Ideal Gas Deviation Factors for the Deep-Water Bering Sea Basins
[R].U.S.Geological Survey, Open-File Report 2005-1451, 2005.
［10］Gong Xiaonan.Advanced Soil Mechanic
[M].Hangzhou:Zhejiang University Press,2002:25-26.
[龚晓南.高等土力学
[M].杭州：浙江大学出版社，2002:25-26.]
［11］Lei Zhidong,Yang Shixiu,Xie Senchuan.Dynamics of Soil Water
[M].Beijing:Tsinghua University Press,1987:18-22.
[雷志栋，杨诗秀，谢森传.土壤水动力学
[M].北京：清华大学出版社，1987：18-22.]
［12］Lu H,Zeng H,Ripmeester J A,et al.Sediment control on the saturation level of gas hydrate in nature environments
[C]//Proceedings of the 6th International Conference on Gas Hydrates.Canada:Vancouver,2008,July:6-10.
[13]Song Qi,Wang Shuli,Chen Yan,et al.A new kinetic model and experiment for natural gas hydrate
[J].Natural Gas Geoscience,2010，21 (5):868-874.
[宋琦, 王树立, 陈燕, 等. 天然气水合物新型动力学模型与实验研究
[J].天然气地球科学,2010,21 (5):868-874.]
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