Experimental study of growth kinetics of CO<sub>2</sub> hydrates and multiphase flow properties of slurries in high pressure flow systems

Lv, Xiaofang; Zuo, Jiangwei; Liu, Yang; Zhou, Shidong; Lu, Dayong; Yan, Ke‐Le; Shi, Bohui; Zhao, Huijun

doi:10.1039/c9ra06445a

Cited by 27 publications

(25 citation statements)

References 42 publications

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“…Contrary to this result in the present study, Lv et al. , reported that the hydrate formation in the later stage is inhibited at a higher water flow rate because the gas‐liquid interface is covered by the formed hydrate, by promotion of the mass transfer. In this study, the decreasing trend of the hydrate formation rate was not observed.…”

Section: Resultscontrasting

confidence: 99%

Development and Continuous Operation of a Bench‐Scale System for the Production of O₃ + O₂ + CO₂ Hydrates

Hatsugai

Nakayama

Tomura³

et al. 2020

Chem Eng & Technol

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Ozone (O 3) has many industrial applications such as in sterilization. One of the long-term O 3 preservation methods is molecular storage in clathrate hydrate. In this study, an experimental system was developed for continuously forming O 3 + O 2 + CO 2 hydrates. The parameters that affect the continuous operation of the system and that lead to increases in the concentration of O 3 in the hydrates were also experimentally evaluated, implementing the method of quality engineering. After optimizing these operating parameters, the O 3 storage capacity in the hydrates was measured to be 0.26 wt % at 2 h of total operation time. By X-ray diffraction, it was found that the produced sample contained hydrates, and longterm preservation for 6 months was possible at the temperature of general freezing warehouses.

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Section: Resultscontrasting

confidence: 99%

Development and Continuous Operation of a Bench‐Scale System for the Production of O₃ + O₂ + CO₂ Hydrates

Hatsugai

Nakayama

Tomura³

et al. 2020

Chem Eng & Technol

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“…Lv et al 15 explored the influence of the amount of liquid transferred in a pure water system on the induction time of hydrate formation in an experiment on the influencing factors of hydrate formation characteristics and found that the hydrate induction time first decreased and then increased with the increase in the carrier liquid with the V-type tendency, which is in good agreement with the results of this experiment. The amount of carrier liquid in the pure water system and the water content in the oil−water emulsion system directly affected the size of the gas−water interface area, which determined the formation of hydrates and the distribution state and volume fraction of hydrates in the system.…”

Section: Results and Analysismentioning

confidence: 99%

“…Most scholars use single-factor methods to conduct qualitative research on these factors, ,− such as the effects of pressure, temperature, water content, and additives on the induction time of hydrate formation; however, there is a lack of sensitivity analysis on the degree of influence of various factors on the induction time of hydrate formation. The theoretical basis of the degree of sensitivity analysis is as follows: ,, the dependent variable Y is affected by the independent variables X 1 , X 2 , X 3 , ..., X m . A total of n experiments were performed as follows: where X ik represents the value of the independent variable X of the k th test, and Y k represents the value of the dependent variable Y of the k th test.…”

Section: Sensitivity Analysis Of Factors Affecting Hydrate Induction ...mentioning

confidence: 99%

“…However, the transportation of CO 2 hydrate under the pipeline system still has the problem of flow guarantee, such as the blockage of the pipeline due to the deposition of hydrate. Based on the highpressure flow system, Lv et al 15 explored the experimental study on the growth kinetics of CO 2 hydrate and slurry multiphase flow characteristics in a pure water system and found that the formation and growth of a hydrate deposition layer on the upper part of the pipeline was the main reason for the blockage. The increase of supersaturation enhanced the driving force of hydrate crystallization and accelerated the nucleation and crystallization rate of hydrate.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Influencing Factors on the Kinetics Characteristics of Carbon Dioxide Hydrates in High Pressure Flow Systems

et al. 2021

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Exploring the kinetics and flow characteristics of carbon dioxide hydrate slurry plays a critical role in the effective application of carbon capture technology by hydrate method and maintenance of the flow assurance. In order to better understand the formation and blockage process of carbon dioxide hydrate in the pipeline transportation system, a high-pressure flow experimental loop with a visible window was designed to study the formation process of carbon dioxide (CO2) hydrate and growth kinetics in a pure water system in a pipeline flow system. It is concluded that adding polyvinylpyrrolidone (PVP) as a kinetic inhibitor can significantly extend the hydrate induction time. PVP, flow rate, and carrier liquid had a significant effect on the particle size in the system. Combined with the focused beam reflectance measurement (FBRM), a mechanism of pipe blockage under a pure water system with high subcooling is proposed. Based on the standard regression coefficient method, the sensitivity analysis of the influence of various factors on the induction time was performed. The results indicated that, compared with other factors, the pressure was the main factor affecting the hydrate induction time. The experimental results obtained through the small experimental device can well reveal the law between the various parameter and the essence of the phenomenon. Therefore, the findings obtained from the experiment of the circulation loop can provide a meaningful reference for the clogging mechanism and the actual management of industrial pipelines. Research on the flow and kinetics characteristics of CO2 carbon dioxide hydrate slurry is used to understand the flow process and clogging tendency of hydrate slurry in pipeline transportation systems and to provide a theoretical basis for CO2 hydrate slurry transportation technology.

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“…The study of the growth process and growth rate of hydrates in pipelines − has found that the main reason hydrates form blockages in pipelines is that they adhere to the pipelines due to the formation of a liquid bridge . Reducing the adhesion of hydrates is one of the effective ways to solve the blockages that they form.…”

Section: Introductionmentioning

confidence: 99%

Reduction Clathrate Hydrates Growth Rates and Adhesion Forces on Surfaces of Inorganic or Polymer Coatings

Fan

Zhang

Yang³

et al. 2020

Energy Fuels

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Hydrate plugging is one of the major risks for oil and gas transportation in pipelines. To mitigate the adhesion between hydrate particles and pipeline walls, hexagonal boron nitride (HBN), polydimethylsiloxane (PDMS), and fluoro-coating (F-coating) were added with hydrophobic fuming SiO2 as coating materials, which were coated on four different substrates (X70 steel, X80 steel, zirconia plate (ZrO2), and tinplate). The adhesion force between tetrahydrofuran (THF) hydrate particles and coated substrates was measured by a micromechanical force apparatus (MMF). For the X70 substrate with F-coating, the adhesion force was reduced by 80.3% when the mass fraction of SiO2 was increased from 1 wt % (0.0152 N/m) to 4 wt % (0.0030 N/m). SiO2 exhibits hydrate-phobic properties. The adhesion forces were 0.0105, 0.0027, and 0.0043 N/m for X80 (bare), X80+HBN, and X80+PDMS. PDMS+SiO2(1–4 wt %) coating was found able to slow the growth rate of hydrate. In a high-pressure reactor, methane hydrate growth on PDMS+SiO2(4 wt %) coating on the tinplate substrate was studied. No growth of methane hydrate on the coated layer was observed, while there was full coverage on the noncoated layer. The presence of coating was found effective for hindering the growth and attachment of both THF and methane hydrates. Surface morphology was believed to be one of the main factors affecting the adhesion and growth characteristics of hydrate particles. Hydrate-phobic coating has been put forward in this work that refers to a functional coating that prevents hydrates.

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Experimental study of growth kinetics of CO₂ hydrates and multiphase flow properties of slurries in high pressure flow systems

Abstract: The formation and accumulation of hydrates in high pressure oil and gas pipelines bring great risks to field development and deep-water transportation.

Cited by 27 publications

References 42 publications

Development and Continuous Operation of a Bench‐Scale System for the Production of O₃ + O₂ + CO₂ Hydrates

Development and Continuous Operation of a Bench‐Scale System for the Production of O₃ + O₂ + CO₂ Hydrates

Analysis of Influencing Factors on the Kinetics Characteristics of Carbon Dioxide Hydrates in High Pressure Flow Systems

Reduction Clathrate Hydrates Growth Rates and Adhesion Forces on Surfaces of Inorganic or Polymer Coatings

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Experimental study of growth kinetics of CO2 hydrates and multiphase flow properties of slurries in high pressure flow systems

Abstract: The formation and accumulation of hydrates in high pressure oil and gas pipelines bring great risks to field development and deep-water transportation.

Cited by 27 publications

References 42 publications

Development and Continuous Operation of a Bench‐Scale System for the Production of O3 + O2 + CO2 Hydrates

Development and Continuous Operation of a Bench‐Scale System for the Production of O3 + O2 + CO2 Hydrates

Analysis of Influencing Factors on the Kinetics Characteristics of Carbon Dioxide Hydrates in High Pressure Flow Systems

Reduction Clathrate Hydrates Growth Rates and Adhesion Forces on Surfaces of Inorganic or Polymer Coatings

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Experimental study of growth kinetics of CO₂ hydrates and multiphase flow properties of slurries in high pressure flow systems

Development and Continuous Operation of a Bench‐Scale System for the Production of O₃ + O₂ + CO₂ Hydrates

Development and Continuous Operation of a Bench‐Scale System for the Production of O₃ + O₂ + CO₂ Hydrates