石英介质中甲烷水合物生成特性的实验研究  

Experimental study of methane hydrate formation in quartz media

作　　者：陈龙[1,2,3,4,5] 张郁[1,2,3,4] 李小森 陈朝阳[1,2,3,4] 李刚 

机构地区：[1]中国科学院广州能源研究所,广东广州510640 [2]中国科学院天然气水合物重点实验室,广东广州510640 [3]广东省新能源和可再生能源研究开发与应用重点实验室,广东广州510640 [4]中国科学院广州天然气水合物研究中心,广东广州510640 [5]中国科学院大学,北京100049

出　　处：《天然气化工—C1化学与化工》2018年第1期60-66,共7页Natural Gas Chemical Industry

基　　金：国家海洋地质专项(GHZ2012006003);国家自然科学基金(51476174;51276182;51376183);中国科学院重点部署项目(KGZD-EW-301-2);广东省自然科学基金(2014A030313669);中国石油-中国科学院科技合作项目(2015A-4813)

摘　　要：在恒容条件下,实验研究了甲烷水合物在不同粒径的石英介质体系中的生成特性。在不同初始压力(9MPa、12MPa和15MPa)、不同水浴温度(3℃、5℃、7℃和9℃)以及不同粒径(2μm、5μm和229μm)的条件下,研究了以上各因素对水合物生成规律的影响。实验表明,在粒径为2μm石英介质中,水合物的生成速度较快;在生成初期,水合物生成时体系温度迅速上升,温度的升高受到水合物平衡生成温度的限制;随着水合物生成量的增大,生成过程开始受到传质过程的控制;水的转化率随着水浴温度的降低与初始生成压力的增大而增大,但增大的幅度并不显著。粒径229μm的石英砂中,水合物的生成速度与最终水的转化率均明显低于粒径为2μm与5μm时,水合物的生成受到传质过程控制。The formation behaviors of methane hydrate in quartz media with the particle sizes of 2μm, 5μm and 229μm were studied. The experiments were carried out under the conditions of initial pressures of 9MPa, 12MPa and 15MPa and the bath temperature of 3℃, 5℃, 7℃ and 9℃. The influence factors on the hydrate formation were analyzed and compared. The experimental results indicate that the methane hydrate formation rate is very fast in the quartz media with the particle sizes of 2μm and 5μm and the final water conversion is similar at the same condition. At the beginning stage, the temperature of system increases quickly when the hydrate begins to form. The rise of temperature is limited by the phase equilibrium temperature of the methane hydrate. With the increase of hydrate amount in the media, the hydrate formation becomes to be controlled by the process of mass transfer. The final water conversion increases with the decrease of the bath temperature and the increase of the initial formation pressure, but the improvement is not remarkable. In the experiment with the particle size of 229μm, the hydrate formation rate and the water conversion are significantly lower than that with the particle size of 2μm and 5μm, and the hydrate formation is significantly controlled by the process of mass transfer.

关 键 词：甲烷水合物 粒径 生成速率 传质过程 转化率 

分 类 号：TE13[石油与天然气工程—油气勘探] TK01[动力工程及工程热物理]