Methane hydrate crystal growth on shell substrate  

作　　者：Xin Jiang Baojiang Sun Zhiyuan Wang Wantian Zhou Jiakai Ji Litao Chen 

机构地区：[1]School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China [2]Key Laboratory of Unconventional Oil and Gas Development,China University of Petroleum(East China),Qingdao 266580,China

出　　处：《Chinese Journal of Chemical Engineering》2022年第3期50-61,共12页中国化学工程学报（英文版）

基　　金：Financially supported by the National Natural Science Foundation of China(51991365 and 51876222);China National Petroleum Corporation(CNPC)Major Science and Technology Project(ZD2019-184-002)。

摘　　要：Hydrate crystals growth on the surface of methane bubble(hydrate film)in pure water was studied by using a high-pressure visible microscope under the conditions of subcoolingΔT=5.44-13.72 K and methane concentration differenceΔC=2.92-8.19 mol·L^(-1).It was found the hydrate film is porous and the hydrate crystals grow towards the liquid phase on the film substrate.The crystal morphology and growth rate are affected byΔT andΔC.WhenΔT<8.82 K andΔC<4.12 mol·L^(-1),the hydrate grows into scattered columnar crystals,and the axial growth rate of the crystal gradually decreases.WhenΔT>8.82 K orΔC>4.12 mol·L^(-1),the hydrate crystals grow in dendritic shape,and the axial growth rate increases first and then decreases.The perimeter and area of the growing hydrate crystals were measured,and the fractal dimension of hydrate crystal under differentΔC andΔT was calculated.The results show that the fractal dimension of columnar hydrate crystal is greater than 3.When3.87 mol·L^(-1)<ΔC<4.20 mol·L^(-1) and 7.4 K<ΔT<8.8 K,the fractal dimension of columnar hydrate crystal is greater than 4;The fractal dimension of dendritic hydrate crystal is less than 3.WhenΔC>4.77 mol·L^(-1),ΔT<8.52 K,the fractal dimension of dendritic hydrate crystal is less than 2.

关 键 词：METHANE HYDRATE Crystal growth MORPHOLOGY Fractal dimension 

分 类 号：O782[理学—晶体学] TQ221.11[化学工程—有机化工]