Investigation on the reduction effect of QAs1 on the adhesion force between methane hydrate particles and wall droplets

Wang, Zhiyuan; Li, Pengfei; Tong, Shikun; Zhang, Jianbo; Chenru, Zhou; Pei, Jihao; Yang, Hemin; Liu, Chenwei

doi:10.1016/j.fuel.2023.127521

Cited by 10 publications

(6 citation statements)

References 40 publications

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“…When the particles were separated from the wall droplets, the liquid bridge at this point consisted of both free water and hydrate film. With the hydrate film covering surface of the liquid bridge, the cohesive force was established by the combined force of the liquid bridge and the hydrate film. , Since the tensile strength of hydrate was much greater than that of water droplets, the increase in subcooling led to an overall increase in cohesive force.…”

Section: Resultsmentioning

confidence: 99%

“…With the hydrate film covering surface of the liquid bridge, the cohesive force was established by the combined force of the liquid bridge and the hydrate film. 28,29 Since the tensile strength of hydrate was much greater than that of water droplets, the increase in subcooling led to an overall increase in cohesive force. The cohesive force between the hydrate particles and the wall hydrate at different subcooling degrees was directly measured when the wall droplets grew to unusual degrees of hydrate.…”

Section: Effect Of Subcooling On the Cohesive Force Behavior Of Hydra...mentioning

confidence: 99%

“…As the degree of free water conversion inside the liquid bridge increases, the degree of sintering gradually increases, thus leading to an increase in the tensile strength. 29,40,41 The consequence of this is that hydrate particles are more difficult to separate upon contact with the Figure 13. Contact-separation images of hydrate particles with wall hydrate in the low-and high-saturation states when the subcooling degree is 1 and 5 °C, respectively.…”

Section: Effect Of Subcooling On the Cohesive Force Behavior Of Hydra...mentioning

confidence: 99%

“…In the presence of water, the cohesive force intensified, and the measurement captured the discernible growth process of the hydrate film. Wang et al 29 studied the cohesive force between methane hydrate particles and wall droplets, then explored the role of quaternary ammonium salt (QAs1) in the system. The cohesive force was the lowest when the concentration of QAs1 was 0.2 wt %, and the cohesive force gradually increased with the increase of subcooling.…”

Section: Introductionmentioning

confidence: 99%

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Study of Sintering Behavior of Methane Hydrate Particles on the Wall Surface

Zhou,

Ren,

et al. 2024

Langmuir

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The sintering of hydrate aggregates on the pipe wall is a major form of hydrate deposition. Understanding the sintering behavior of hydrates on the wall is crucial for promoting hydrate safety management and preventing pipeline blockage. However, limited research currently exists on this topic. In this study, the cohesive force strength of hydrate particles on the wall surface under different conditions was directly measured using a highpressure micromechanical force device (HP-MMF). Subsequently, the effects of subcooling and glycine on the cohesive force were investigated. The results indicate that the cohesive force is influenced by different growth states during the process of free water on the wall surface gradually growing into hydrate. Three states with larger measured values during the growth process were selected for research. Observation showed that increased subcooling strengthened sintering by accelerating the growth rate of the hydrate film, resulting in a significant increase in cohesive force. The role of glycine in the methane hydrate system was then evaluated. Glycine was found to reduce the degree of sintering by reducing the growth rate of the hydrate film, thereby decreasing the cohesive force. The optimal concentration in the system was determined to be 0.25 wt %. Moreover, compared with low subcooling (1 °C), glycine had a better effect at high subcooling (5 °C). At 5 °C subcooling and the optimal concentration, the cohesive force in the wall droplet state decreases from 677.38 to 489.02 mN/m, the cohesive force at the low-saturation state decreases from 951.79 to 543.32 mN/m, and the cohesive force at the high-saturation state decreases from 1194.95 to 641.76 mN/m. These findings contribute to a better understanding of the cohesive force behavior of gas hydrate on the inner wall of the pipeline and provide basic data for reducing the risk of hydrate blockage.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of Subcooling On the Cohesive Force Behavior Of Hydra...mentioning

confidence: 99%

Section: Effect Of Subcooling On the Cohesive Force Behavior Of Hydra...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of Sintering Behavior of Methane Hydrate Particles on the Wall Surface

Zhou,

Ren,

et al. 2024

Langmuir

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“…In recent years, the effects of LDHIs on the growth, aggregation, and flow characteristics of hydrates have become the subject of many experimental equipment studies, such as torque measuring instruments, − micromechanical force (MMF) devices, − high-pressure autoclaves, , focused beam reflection measurement probes (FBRM), , etc. Since the type of dominant particle interactions determines the microstructure of the discrete terms, MMF instruments are advantageous in establishing the relationship between microscopic forces and macroscopic properties, such as fluid viscosity.…”

Section: Introductionmentioning

confidence: 99%

Study of Hydrate Particle Morphology and Cohesive Force in the Presence of Wax and Glycine

Zhou,

Ren,

et al. 2024

Energy Fuels

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During the operation of deep-sea pipelines, the accumulation and deposition of hydrates are important reasons for pipeline blockage. The current main measure to solve the hydrate plugging problem is the addition of low-dose inhibitors (LDHIs), but it is not yet known whether the precipitation of wax crystals will affect their effectiveness. Therefore, in this study, the hydrate cohesive force within the wax-free/wax-containing system was directly measured by using a micromechanical force device (MMF) and the reasons for the change in cohesive force were analyzed from a morphological point of view. The results showed that glycine was effective in reducing the cohesion between hydrate particles in both wax-free/wax-containing systems and still exerted the effect of antiagglomeration agent (AA) at very low concentrations (as low as 0.10 wt %). Moreover, the optimum concentration of glycine was 0.50 wt %. At this concentration, the cohesive force decreased from 8.54 to 7.07 mN/m in the wax-free system, a decrease of about 17.2%, while the cohesive force decreased from 5.94 to 2.15 mN/m in the wax-containing system, a decrease of about 63.8%. By observation of the morphology of the hydrate particles, the presence of glycine was found to reduce the volume of the liquid bridge by changing the surface roughness and wettability of the particles, thereby reducing the cohesive force. And when wax was contained in the system, the wax further reduced the wettability by adsorbing on the surface of the hydrate particles. However, under certain AA conditions, the increase in wax concentration (from 0.1 to 0.3 wt %) resulted in the free water inside the hydrate being more likely to form liquid bridges with the surrounding particles, thus weakening the effect of AA. This work analyzes the effect on cohesive force in the simultaneous presence of LDHIs and wax from a morphological point of view, which is beneficial in providing more insights into securing safe hydrate flow management.

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