Dissociation heat transfer characteristics of methane hydrates

Kamath, V.A.; Holder, Gerald D.

doi:10.1002/aic.690330228

Cited by 119 publications

(68 citation statements)

References 6 publications

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“…In such cases, the dissociation process of hydrate is equivalent to the heat transfer process, which could be represented by the rate at which the dissociation temperature for the hydrate progresses. [1][2][3][4][5] However, the apparent dissociation rate would, in general, include the mass transfer rate and the intrinsic dissociation rate at the hydrate surface as well as the heat transfer rate. It is necessary to evaluate all the rates of mass transfer, heat transfer, and the intrinsic dissociation for an accurate prediction of the apparent hydrate dissociation rate.…”

Section: Introductionmentioning

confidence: 99%

CFD and experimental study on methane hydrate dissociation Part I. Dissociation under water flow

et al. 2006

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in Wiley InterScience (www.interscience.wiley.com).Dissociation processes of methane hydrate under water flow conditions were investigated by a combination of experimental observations and numerical simulations using computational fluid dynamics (CFD). In Part I of this study, the dissociation process induced by water flow at pressures above the three-phase [hydrate (H)-liquid water (L w )-vapor (V)] boundary in an isothermal x-P phase diagram is discussed. Dissociation experiments were carried out with a methane hydrate ball (diameter % 10 mm) suspended in a flow cell, and the overall dissociation rate of methane hydrate without bubble formation was measured under various conditions of pressure, temperature, and volumetric flow rate of water. A linear phenomenological rate equation in the form of the product of the dissociation rate constant k bl and the molar Gibbs free energy difference DG, between the hydrate phase and the ambient aqueous phase, was derived by considering the Gibbs free energy difference as the driving force for the dissociation. The molar Gibbs free energy difference was expressed by the logarithm of the ratio of the concentration of methane dissolved in water at the hydrate surface to the solubility of methane in the aqueous solution in equilibrium with the hydrate. The dissociation rate constant k bl was determined from the experimental results of the overall dissociation rate combined with the numerical simulation results of the concentration profile of methane by the CFD method. The obtained dissociation rate constant was found to be independent of the ambient water flow rate, indicating that the rate constant is intrinsic for the hydrate dissociation within the conditions examined in this study. The rate constant was independent of the pressure, whereas the temperature dependency was described by an Arrhenius-type equation with the apparent activation energy of 98.3 kJ/mol.

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Section: Introductionmentioning

confidence: 99%

CFD and experimental study on methane hydrate dissociation Part I. Dissociation under water flow

et al. 2006

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“…For the final regasification of manufactured hydrates involving thermal stimulation, the decomposition rate is controlled by the heat transfer rate from the heat source to the dissociating hydrate [22][23][24]. The dominant mode of the heat transfer in regasifiers is considered to be multiphase convection, which may contain three solid/liquid/gas phases or four solid/liquid/ liquid/gas phases in the presence of nonaqueous LMGS.…”

Section: Introductionmentioning

confidence: 99%

Static Formation and Dissociation of Methane+Methylcyclohexane Hydrate for Gas Hydrate Production and Regasification

Liang

et al. 2011

Chem Eng & Technol

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The formation and decomposition of methane+methylcyclohexane (MCH) hydrate in a static batch reactor, which was also designed as a high-pressure microwave reactor, were investigated. The addition of 300 ppm sodium dodecyl sulfate (SDS) provides continuous formation of CH 4 +MCH hydrate under static conditions. Increasing the initial pressure within the narrow range of 2.7 to 4.6 MPa at 274 K enhances the formation rate by even several times. The gas storage capacity can be largely improved with partial coexisting of sI CH 4 hydrate. Unlike a stirred formation, an increase of nonaqueous MCH inhibits the static formation of sH hydrate. The following regasification by 2.45 GHz microwave heating indicates that the dissociation is rate-controlled by the parallel connection of efficient internal heating and conventional external heating. The multiphase convection characterized by osmotic dehydration and driven by intensified regasification is considered as the dominant mechanism affecting the quiescent dissociation.

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“…McGuire [66] pointed out that, if the hydrate reservoir has very high permeability and is a Class 2 reservoir, i.e., there is a free water layer below the hydrate-bearing layer, the most suitable technique for exploitation of hydrate reservoirs is the thermal stimulation method. Many experimental simulations using this method have been carried out [67][68][69]. Selim and Sloan [70] found that in porous media, the decomposition rate of hydrate is related to the thermal characteristics of the system and the porosity of the media.…”

Section: Thermal Stimulation Methodsmentioning

confidence: 99%

Experimental Simulation of the Exploitation of Natural Gas Hydrate

Liu

Yuan

et al. 2012

Energies

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Natural gas hydrates are cage-like crystalline compounds in which a large amount of methane is trapped within a crystal structure of water, forming solids at low temperature and high pressure. Natural gas hydrates are widely distributed in permafrost regions and offshore. It is estimated that the worldwide amounts of methane bound in gas hydrates are total twice the amount of carbon to be found in all known fossil fuels on earth. A proper understanding of the relevant exploitation technologies is then important for natural gas production applications. In this paper, the recent advances on the experimental simulation of natural gas hydrate exploitation using the major hydrate production technologies are summarized. In addition, the current situation of the industrial exploitation of natural gas hydrate is introduced, which are expected to be useful for establishing more safe and efficient gas production technologies.

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Dissociation heat transfer characteristics of methane hydrates

Cited by 119 publications

References 6 publications

CFD and experimental study on methane hydrate dissociation Part I. Dissociation under water flow

CFD and experimental study on methane hydrate dissociation Part I. Dissociation under water flow

Static Formation and Dissociation of Methane+Methylcyclohexane Hydrate for Gas Hydrate Production and Regasification

Experimental Simulation of the Exploitation of Natural Gas Hydrate

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