Dynamic behavior of methane hydrates formation and decomposition with a visual high-pressure apparatus

Shu, So-Siou; Lee, Ming‐Jer

doi:10.1016/j.jtice.2016.01.015

Cited by 12 publications

(2 citation statements)

References 27 publications

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“…To follow [22] of Eq. ( 14), the boundary layer's thickness for temperature, δ T is assumed as the same size as that for mass concentration, δ c .…”

Section: Heat and Mass Transfer -Advances In Modelling And Experimental Study For Industrial Applicationsmentioning

confidence: 99%

Direct Numerical Simulation of Hydrate Dissociation in Homogeneous Porous Media by Applying CFD Method: One Example of CO2 Hydrate

Sean¹

2018

Heat and Mass Transfer - Advances in Modelling and Experimental Study for Industrial Applications

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Computational fluid method (CFD) is popular in either large-scale or meso-scale simulations. One example is to establish a new pore-scale (m~μm) model of laboratory-scale sediment samples for estimating the dissociation rate of synthesized CO 2 hydrate (CO 2 H) reported by Jeong. It is assumed that CO 2 H formed homogeneously in spherical pellets. In the bulk flow, concentration and temperature of liquid CO 2 in water flow was analyzed by CFD method under high-pressure state. Finite volume method (FVM) were applied in a face-centered packing in unstructured mesh. At the surface of hydrate, a dissociation model has been employed. Surface mass and heat transfer between hydrate and water are both visualized. The initial temperature 253.15K of CO 2 H pellets dissociated due to ambient warm water flow of 276.15 and 282.15K and fugacity variation, ex. 2.01 and 1.23 MPa. Three tentative cases with porosity 74, 66, and 49% are individually simulated in this study. In the calculation, periodic conditions are imposed at each surface of packing. Numerical results of this work show good agreement with Nihous' model. Kinetic modeling by using 3D unstructured mesh and CFD scheme seems a simple tool, and could be easily extended to determine complex phenomena coupled with momentum, mass and heat transfer in the sediment samples.

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“…To follow [22] of Eq. ( 14), the boundary layer's thickness for temperature, δ T is assumed as the same size as that for mass concentration, δ c .…”

Section: Heat and Mass Transfer -Advances In Modelling And Experimental Study For Industrial Applicationsmentioning

confidence: 99%

Direct Numerical Simulation of Hydrate Dissociation in Homogeneous Porous Media by Applying CFD Method: One Example of CO2 Hydrate

Sean¹

2018

Heat and Mass Transfer - Advances in Modelling and Experimental Study for Industrial Applications

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show abstract

“…In addition to hydrate blockages in pipelines that need to be dissociated, the natural gas hydrates also decompose continuously during the extraction process, which can lead to engineering geological disasters such as subsea stratum deformation, platform tilt and sinking, and climate change. Therefore, many scholars have studied the decomposition characteristics of hydrate particles in high-pressure reactors or porous media by thermal and pressure methods. ,− Among them, in addition to reflecting the decomposition by structural morphology, temperature signalization, and pressure signalization, some scholars also monitored the decomposition process of the hydrate by the change of resistivity (or conductivity), which is a physical quantity that can well reflect the process. Zatsepina et al , monitored the nucleation and decomposition of CO 2 hydrate in porous media by the resistance method.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Hydrate Decomposition on the Gas-Phase Wall Using a Rock-Flow Cell

Zhang

Song

et al. 2023

Energy Fuels

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Hydrate control has always been essential to oil and gas pipeline flow assurance work. To study the decomposition process of the hydrate deposition layer in the gas–water system, the decomposition experiments of the hydrate layer on the gas-phase pipe wall under different heating temperatures, different depressurization rates, and the combined action of heating and depressurization were carried out by using a high-pressure transparent rock-flow cell with a voltage detection system. The dynamic decomposition process was observed, and it was found that the decomposition rate was faster when decomposed by the depressurization method compared to the heating method. The decomposition process of the hydrate layer was quantitatively analyzed based on the voltage signal, and an electrical signal-based method for monitoring the decomposition of the hydrate layer on the pipe wall was proposed. The decomposition mechanism of the hydrate layer in different ways is summarized. During decomposition by heating, the hydrate layer decomposes in the mode of shrinkage ablation. During depressurization decomposition, it decomposes in the mode of differential ablation with the shedding phenomenon. The impact force generated by the gas release is the main reason for hydrate layer shedding. Shedding of the mixture of ice and hydrate occurs at depressurization rates ranging from 0.026 to 0.056 MPa/s, with the risk of ice blockage. This work provides further insight into hydrate decomposition in gas–water flow systems.

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Unlocking the ocean's potential: enhancing carbon capture through innovative replacement of methane hydrate by CO2

Chang,

Choi,

Seo

et al. 2024

Model. Earth Syst. Environ.

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Dynamic behavior of methane hydrates formation and decomposition with a visual high-pressure apparatus

Cited by 12 publications

References 27 publications

Direct Numerical Simulation of Hydrate Dissociation in Homogeneous Porous Media by Applying CFD Method: One Example of CO2 Hydrate

Direct Numerical Simulation of Hydrate Dissociation in Homogeneous Porous Media by Applying CFD Method: One Example of CO2 Hydrate

Experimental Study of Hydrate Decomposition on the Gas-Phase Wall Using a Rock-Flow Cell

Unlocking the ocean's potential: enhancing carbon capture through innovative replacement of methane hydrate by CO2

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