Characterization of carbon dioxide hydrate growth kinetics in carbon micron tube oil-water system

IF 2.6 3区 工程技术 Q3 ENERGY & FUELS Journal of Energy Resources Technology-transactions of The Asme Pub Date : 2023-08-31 DOI:10.1115/1.4063328
Xiaofang Lv, Xingya Ni, Yi Zhao, TianHui Liu, Shun Jing, Boyu Bai, Shangbin Liang, Yang Liu, Q. Ma, Chuanshuo Wang, S. Zhou
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Abstract

Carbon nanotubes have a significant impact on hydrate formation. However, as the effect and mechanism of carbon micrometer tubes, which have a similar structure to carbon nanotubes, on the promotion of hydrate growth is not yet clear. Therefore, in this paper, experiments on the growth kinetics of CO2 hydrate in oil-water systems under the effect of multi-walled carbon microtubes(MWCMTs) were carried out. The effects of pressure, temperature, and oil- water ratio on the induction period and gas consumption of CO2 hydrate were investigated. It also revealed the hydrate growth promotion mechanism of MWCMTs. The conclusions were as follows: (1) MWCMTs could significantly improve the hydrate gas storage capacity in an oil-water system by up to 80.3% over the pure water system. (2) Pressure and temperature had a large effect on the storage capacity and induction time of CO2 hydrate, and the results showed that the induction time decreased significantly with increasing pressure and decreasing temperature. At the same time, the hydrate growth time was significantly shortened, but the gas storage capacity first increased and then decreased. One reason for this was that the hydrate film hindered gas-water mass transfer, and the other was that the gas dissolved by the oil droplets rapidly generated hydrates and could not continue to transfer gas molecules. (3) In the oil-water system, lipophilic MWCMTs carried adsorbed CO2 to contact water, at the same time provided a large number of hydrate nucleation sites to promote hydrate formation.
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碳微米管油水体系中二氧化碳水合物生长动力学表征
碳纳米管对水合物的形成有重要影响。然而,由于与碳纳米管结构相似的碳纳米管对水合物生长的促进作用和机理尚不清楚。因此,本文对多壁碳纳米管(MWCMTs)作用下油水系统中CO2水合物的生长动力学进行了实验研究。研究了压力、温度和油水比对CO2水合物诱导期和耗气量的影响。同时揭示了MWCMTs的水合物生长促进机制。结果表明:(1)MWCMTs能显著提高油水系统中水合物气体的储存能力,比纯水系统提高80.3%。(2) 压力和温度对CO2水合物的储存能力和诱导时间有很大影响,结果表明,诱导时间随着压力的增加和温度的降低而显著缩短。同时,水合物生长时间明显缩短,但储气能力先增大后减小。原因之一是水合物膜阻碍了气水传质,另一个原因是油滴溶解的气体迅速生成水合物,无法继续传递气体分子。(3) 在油水系统中,亲脂性MWCMTs携带吸附的CO2与水接触,同时提供了大量的水合物成核位点,促进水合物的形成。
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来源期刊
CiteScore
6.40
自引率
30.00%
发文量
213
审稿时长
4.5 months
期刊介绍: Specific areas of importance including, but not limited to: Fundamentals of thermodynamics such as energy, entropy and exergy, laws of thermodynamics; Thermoeconomics; Alternative and renewable energy sources; Internal combustion engines; (Geo) thermal energy storage and conversion systems; Fundamental combustion of fuels; Energy resource recovery from biomass and solid wastes; Carbon capture; Land and offshore wells drilling; Production and reservoir engineering;, Economics of energy resource exploitation
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