Research on Gas Hydrate Plug Formation under Pipeline-Like Conditions

Merkel, Florian Stephan; Schmuck, Carsten; Schultz, H. J.; Scholz, Timo Alexander; Wolinski, Sven

doi:10.1155/2015/214638

Cited by 10 publications

(10 citation statements)

References 6 publications

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“…Experiments were conducted at “target” temperatures of 4 °C and “target” pressures of 160 bar(g). These conditions were determined to be the “best” conditions (regarding a low standard deviation) for determining inhibition suitability in previous experimental series …”

Section: Methodsmentioning

confidence: 99%

“…The underlying concept of the investigations is the idea to develop a functional coating, that shall be applied permanently in pipelines and inhibit gas hydrate formation, without the need to continuously add inhibitor to the pipeline. To evaluate the feasibility of this concept and to find suitable substances to apply as a coating, it is critical to determine if the above-mentioned “optimal local concentration of functional groups” exists and what the exact concentration is. , …”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Influence of Hydroxyl Groups on Gas Hydrate Formation at Pipeline-Like Conditions

2016

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Clathrates of natural gases, also called “gas hydrates”, are ice-like solids made up of water and gas molecules. They have become increasingly interesting in science and industry in the last decades, because of their potential as an energetic resource as well as because of their ability to block and damage pipelines (so-called “plugging”) under certain conditions. The mechanism of hydrate formation, however, is not fully explored yet, especially regarding the formation in the presence of substances other than gas and water molecules. Therefore, in this paper, the influence of substances with OH-molecular groups on methane hydrate formation has been thoroughly investigated in high-pressure experiments.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of the Influence of Hydroxyl Groups on Gas Hydrate Formation at Pipeline-Like Conditions

2016

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“…500 m) and low temperatures close to 0 • C, must be present. Earlier but still persistent and ongoing research concerning gas hydrates was in the field of flow assurance, especially in inhibition research [14][15][16][17][18][19][20][21][22], to prevent the plugging of pipelines and related equipment by unintended hydrate formation.…”

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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“…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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Research on Gas Hydrate Plug Formation under Pipeline-Like Conditions

Cited by 10 publications

References 6 publications

Investigation of the Influence of Hydroxyl Groups on Gas Hydrate Formation at Pipeline-Like Conditions

Investigation of the Influence of Hydroxyl Groups on Gas Hydrate Formation at Pipeline-Like Conditions

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

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