Methane Extraction from Natural Gas Hydrate Reservoirs with Simultaneous Storage of Carbon Dioxide

Merkel, Florian Stephan; Schultz, H. J.

doi:10.1002/cite.201300164

Cited by 14 publications

(11 citation statements)

References 9 publications

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“…All of these structures consist of small dodecahedral cages and larger cages with attached hexagonal or square surfaces that vary in size and ratio [1]. About twice the amount of energy, compared to all other fossil fuels, is stored in the form of natural gas hydrates [2], which is why the exploitation via depressurization [3][4][5][6], thermal stimulation [4][5][6][7][8], carbon dioxide sequestration or geological storage [9][10][11][12][13] becomes a larger topic. Natural gas hydrates are found worldwide, especially in the form of oceanic reserves, offshore and submarine, along continental slopes, for example, off the coasts of the United States (Hydrate Ridge) and China (South China Sea), as well as in permafrost (e.g., Canada, Mackenzie Delta; Russia, Messoyakah Field) [1,2].…”

Section: Introductionmentioning

confidence: 99%

Rapid Gas Hydrate Formation—Evaluation of Three Reactor Concepts and Feasibility Study

Filarsky¹,

Wieser²,

Schultz³

2021

Molecules

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Gas hydrates show great potential with regard to various technical applications, such as gas conditioning, separation and storage. Hence, there has been an increased interest in applied gas hydrate research worldwide in recent years. This paper describes the development of an energetically promising, highly attractive rapid gas hydrate production process that enables the instantaneous conditioning and storage of gases in the form of solid hydrates, as an alternative to costly established processes, such as, for example, cryogenic demethanization. In the first step of the investigations, three different reactor concepts for rapid hydrate formation were evaluated. It could be shown that coupled spraying with stirring provided the fastest hydrate formation and highest gas uptakes in the hydrate phase. In the second step, extensive experimental series were executed, using various different gas compositions on the example of synthetic natural gas mixtures containing methane, ethane and propane. Methane is eliminated from the gas phase and stored in gas hydrates. The experiments were conducted under moderate conditions (8 bar(g), 9–14 °C), using tetrahydrofuran as a thermodynamic promoter in a stoichiometric concentration of 5.56 mole%. High storage capacities, formation rates and separation efficiencies were achieved at moderate operation conditions supported by rough economic considerations, successfully showing the feasibility of this innovative concept. An adapted McCabe-Thiele diagram was created to approximately determine the necessary theoretical separation stage numbers for high purity gas separation requirements.

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Section: Introductionmentioning

confidence: 99%

Rapid Gas Hydrate Formation—Evaluation of Three Reactor Concepts and Feasibility Study

Filarsky¹,

Wieser²,

Schultz³

2021

Molecules

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“…Previous gas hydrate research has focused on the exploitation of natural gas hydrate reservoirs − and on the field of flow assurance. Here, unintentional gas hydrate formation in pipelines results in unsafe operating conditions, defects, and annual economic costs in the range of millions of dollars. − Nowadays, new application possibilities, where targeted formation is favored, have been introduced in the fields of gas storage and transport, , carbon dioxide sequestration, , gas separation, − desalination, , biotechnology, , food engineering, , and phase-change materials. , Thus, the use of gas hydrate storage seems to be a very promising approach, as gas hydrate storage is capable of storing approximately 170 N m 3 /m 3 of natural gas but at more moderate conditions compared to compressed or liquefied natural gas while providing low safety risks toward explosions …”

Section: Introductionmentioning

confidence: 99%

Impact of Modified Silica Beads on Methane Hydrate Formation in a Fixed-Bed Reactor

Filarsky

Schmuck

Schultz

2019

Ind. Eng. Chem. Res.

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The work deals with the optimization of methane hydrate storage in fixed-bed reactor systems made up of modified silica beads. Under transient conditions, rapid hydrate growth is achieved at 4 °C. Glass beads are modified via silanization and treated with peroxymonosulfuric acid. It is proven that the fixed-bed surface properties significantly determine the gas hydrate growth and final gas uptake and therefore determine the successful technical design of the system. The capillary pressure is calculated in each bed configuration and is set in relation to the overall gas uptake. A negative capillary pressure leads to a holdback of water in the fixed-bed system. A high water-to-hydrate conversion is obtained for an untreated fixed bed with a positive capillary pressure. In the presence of SDS, the capillary effects are negated by the kinetic promotion effects. An inhibiting behavior is observed when using hydrophilic beads after treatment with peroxymonosulfuric acid.

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“…In this work, only the hydrate structure I (s I, simple cubic structure) is of importance, since methane (as the main component of natural gas) as guest leads to the formation of s I hydrate. The structure contains two types of cages (labeled "A" and "B" in Table 1), one "small" and one "large" cage type, which differ in size, number of water molecules, and the type of faces that form a cage (see Table 1) [1,[3][4][5].…”

Section: Gas Hydratesmentioning

confidence: 99%

“…To better prevent plugging in pipelines and for optimizing pipeline operation, it is critical to predict the formation time of hydrates in pipelines. However, the prediction of hydrate formation time in pipelines causes difficulties, since so far, the hydrate formation mechanism still has not been conclusively proven and hence only limited predictability of the kinetic phenomena is given for a concrete application [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Research on Gas Hydrate Plug Formation under Pipeline-Like Conditions

Merkel

Schmuck

Schultz

et al. 2015

International Journal of Chemical Engineering

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Hydrates of natural gases like methane have become subject of great interest over the last few decades, mainly because of their potential as energy resource. The exploitation of these natural gases from gas hydrates is seen as a promising mean to solve future energetic problems. Furthermore, gas hydrates play an important role in gas transportation and gas storage: in pipelines, particularly in tubes and valves, gas hydrates are formed and obstruct the gas flow. This phenomenon is called “plugging” and causes high operational expenditure as well as precarious safety conditions. In this work, research on the formation of gas hydrates under pipeline-like conditions, with the aim to predict induction times as a mean to evaluate the plugging potential, is described.

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Methane Extraction from Natural Gas Hydrate Reservoirs with Simultaneous Storage of Carbon Dioxide

Cited by 14 publications

References 9 publications

Rapid Gas Hydrate Formation—Evaluation of Three Reactor Concepts and Feasibility Study

Rapid Gas Hydrate Formation—Evaluation of Three Reactor Concepts and Feasibility Study

Impact of Modified Silica Beads on Methane Hydrate Formation in a Fixed-Bed Reactor

Research on Gas Hydrate Plug Formation under Pipeline-Like Conditions

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