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Effect of particle size, water saturation, inorganic salt and methane on the phase equilibrium of CO2 hydrates in sediments

文献类型：期刊论文

作者Zhou, Xuebing1,2; Fan, Shuanshi3; Xu, Chenlu4,5; Wen, Huiyun1; Chuvilin, Evgeny6; Liang, Deqing1,2
刊名FLUID PHASE EQUILIBRIA
出版日期2025
卷号588页码:10
关键词Gas hydrate Hydrate equilibrium Carbon dioxide Methane SEM
ISSN号0378-3812
DOI10.1016/j.fluid.2024.114234
通讯作者Liang, Deqing(liangdq@ms.giec.ac.cn)
英文摘要Understanding the thermal stability of gas hydrate in complex marine geological environment is of importance to hydrate-based carbon sequestration. In this work, the factors affecting the equilibrium of CO2 hydrate in ocean sediments, including quartz sands, inorganic salts and gas impurities were quantitatively measured in a temperature range from 273 to 283 K and a phase equilibrium model of hydrate was established. To reveal the distribution in pore structure, the micro-morphologies of hydrate-bearing sediments were measured by cryo-SEM. Results showed that reduction of initial water saturation, addition of NaCl and CH4 were found to have inhibitory effect on CO2 hydrate equilibrium. Initial water saturation reduced the equilibrium temperature by the capillary pressure, but only 0.3-0.7 K temperature depression was observed as the water saturation reduced to 5 %. About 5.7 K in the average temperature depression was found by the addition of 10 wt% NaCl and 24 mol% CH4. NaCl and CH4 influenced the hydrate equilibrium by changing the water activity and chemical potential of hydrate water lattice. SEM images showed that the hydrate formed in pores of quartz sand had porous surface and coated the sand particles like a layer of cells which are 5-20 mu m in diameter, suggesting the hydrate layer exists between the liquid and gas phase. Based on the van der Waals-Platteeuw model, a hydrate equilibrium model was developed. The model provided a good prediction of the hydrate equilibrium in the presence of quartz sand, NaCl and CH4 with an averaged deviation of +/- 4.2 %, which had the potential to be applicated in more complexed ocean sedimentary environment.
WOS关键词GAS-HYDRATE ; STABILITY CONDITIONS ; POROUS-MEDIA ; MODEL ; ELECTROLYTES ; TEMPERATURE ; TECHNOLOGY ; ICE
资助项目Special project for marine economy development of Guangdong (Six marine industries)[[2022] 46] ; State Key Laboratory of Marine Gas Hydrate[2022-KFJJ-SHW]
WOS研究方向Thermodynamics ; Chemistry ; Engineering
语种英语
WOS记录号WOS:001324752400001
出版者ELSEVIER
资助机构Special project for marine economy development of Guangdong (Six marine industries) ; State Key Laboratory of Marine Gas Hydrate
源URL[http://ir.giec.ac.cn/handle/344007/42996]  
专题中国科学院广州能源研究所
通讯作者Liang, Deqing
作者单位1.Natl Key Lab Marine Nat Gas Hydrate, Beijing 100028, Peoples R China
2.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China
3.South China Univ Technol, Sch Chem & Chem Engn, Guangzhou 510640, Peoples R China
4.Natl Engn Res Ctr Gas Hydrate Explorat & Dev, Guangzhou 510075, Peoples R China
5.China Geol Survey, Guangzhou Marine Geol Survey, Guangzhou 510075, Peoples R China
6.Skolkovo Inst Sci & Technol, Skolkovo Innovat Ctr, Moscow, Russia
推荐引用方式
GB/T 7714		 Zhou, Xuebing,Fan, Shuanshi,Xu, Chenlu,et al. Effect of particle size, water saturation, inorganic salt and methane on the phase equilibrium of CO2 hydrates in sediments[J]. FLUID PHASE EQUILIBRIA,2025,588:10.
APA Zhou, Xuebing,Fan, Shuanshi,Xu, Chenlu,Wen, Huiyun,Chuvilin, Evgeny,&Liang, Deqing.(2025).Effect of particle size, water saturation, inorganic salt and methane on the phase equilibrium of CO2 hydrates in sediments.FLUID PHASE EQUILIBRIA,588,10.
MLA Zhou, Xuebing,et al."Effect of particle size, water saturation, inorganic salt and methane on the phase equilibrium of CO2 hydrates in sediments".FLUID PHASE EQUILIBRIA 588(2025):10.

入库方式： OAI收割

来源：广州能源研究所

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