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5 results on '"Ma, Guiyang"'

4. Effects of salt content on secondary formation of hydrates in complex systems.

Author

Jiang, Xiangchun, Wang, Xiao, Ma, Guiyang, Liang, Zhuo, Jiang, Yeqiang, and Yu, Lufei

Subjects
METHANE hydrates, GAS hydrates, PRESSURE drop (Fluid dynamics), SALT, POROUS materials
Abstract

The phenomenon of 'memory effect' exists in the secondary generation of natural gas hydrates, which is mainly manifested in the fact that the induction time required for the nucleation of hydrates in the secondary generation of hydrates is significantly shorter than that of the primary generation, thus accelerating the generation of hydrates. At present, the research on the memory effect phenomenon has been proven to exist, and its influencing factors have become a research hotspot. In order to study the influence of decomposition time and salt content on the memory effect, the hydrate was generated under the system of porous medium alumina complexed with surfactant SDS, and hydrate secondary generation experiments were carried out by adding different contents of NaCl according to four different decomposition times. The influence of four different decomposition times on the memory effect phenomenon in the secondary generation of hydrates and the influence of different salt contents on the memory effect phenomenon were analyzed by observing the pressure drop changes in the reactor during the hydrate generation process and calculating the methane gas consumption. The experimental results show that different decomposition times can affect the effect and time of the memory effect, and the effect of decomposition time on the memory effect does not show a linear relationship. The addition of salt may have an inhibitory effect on the memory effect. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Synergistic effect of alkanes with tween 80 on the kinetics of CO2hydrate formation

Author

Wang, Zhongsheng, Ma, Guiyang, Qin, Yue, and Ao, Di

Abstract

The environmental problems brought about by the drastic increase in CO2concentration are a great challenge that must be faced by mankind for sustainable development. Fortunately, research on CO2hydrates has provided new views to effectively address these challenges. However, the slow kinetics of CO2hydrate formation, unclear enhancement mechanisms, and high process costs have limited the practical application of hydrate-based carbon capture (HBCC) technology. In this work, we investigated the potential value of long-chain alkanes (n-decane) and Tween80 promoter (kinetics) in HBCC. We examined the key factors determining the promoter effect of long-chain alkanes and the synergistic effect of Tween80 with long-chain alkanes for the first time. The results showed that long-chain alkanes can play a facilitating or inhibiting role for the hydrate formation, depending on the state of the long-chain alkanes. The mechanism of long-chain alkanes to improve the kinetics of hydrate formation was mainly due to the hydrophobic effect and gas mass transfer. The addition of Tween 80 enhanced the stability of the system and promoted the gas mass transfer of long-chain alkanes, which could realize the kinetic enhancement under low-speed stirring conditions. This work helps to elucidate the mechanism of hydrocarbon compounds' influence on the kinetics of hydrate formation and provides a basis for their potential value for HBCC. It also provides some theoretical guidance for the use of inhibitors in the presence of hydrocarbon compounds.

Published
2024
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