Electric power control of a power generator using dissociation expansion of a gas hydrate

Obara, Shin’ya; Mikawa, Daisuke

doi:10.1016/j.apenergy.2018.04.031

Cited by 12 publications

(4 citation statements)

References 13 publications

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“…Although in some areas of gas hydrate research, necessary fundamentals and mechanisms are still being successfully researched and published [23,24], nowadays, the focus is shifting towards technical hydrate application possibilities in the areas of gas storage and transport [25,26], gas separation [27,28], desalination [29,30], phase transfer materials [31,32] and even electricity supply [33].…”

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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“…Recent research has shown that the singular expansion quality of gas hydrate dissociation may be used to take advantage of a significant pressure differential with a slight temperature shift. In addition, it functions as an environmentally friendly actuator system, creating electric power from a power production system based on hydrates [40]. In order to ensure the smooth functioning of the hydrate-based processes described above, one must have a solid grasp of the characteristics of hydrates as well as the time-dependent and -independent thermodynamic behavior of hydrates.…”

Section: Introductionmentioning

confidence: 99%

Colored Wastewater Treatment by Clathrate Hydrate Technique

Mohammed

Al-Humairi

Almukhtar

et al. 2023

Water

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Numerous recent studies have shown that discharging colored wastewater into the environment causes contamination, which has adverse impact due to textile, dyeing, and food industries. The current study presents experimental research on the clathrate hydrate technique used for producing pure water from of wastewater contaminated by dyes. Under constant starting conditions, the clathrate formation for binary (water + refrigerant gas) and ternary (water + refrigerant gas + promotor) systems were studied. The R134a gas was used along with Cyclohexane (2.5 vol%), Tween 80 (100 ppm), and silica gel powder as promotors (100 ppm). Moreover, povidone-iodine (500, 2500, and 5000 ppm) and potassium permanganate (10, 50, and 100 ppm) were used as colored compounds in order to prepare synthetic wastewater (model wastewater). The production of hydrates, which rapidly captured the refrigerant gas molecules in the solid phase, was primarily responsible for the pressure drop. Both povidone-iodine and potassium permanganate have a negligible impact on the hydrate formation rates. It was found that the concentration of povidone-iodine and potassium permanganate in the produced water was decreased.As far as we know, the method of using clathrate hydrate to remove the dyes in water has never been investigated. The results showed that the povidone-iodine removal efficiency ranged between 86% and 92%, and the potassium permanganate removal efficiency ranged between 90% and 95%. The removal efficiency was improved by adding promotors, which increased the dissolved gas quantity and the amount of water hydrates. The maximum removal efficiency was accomplished using silica gel powder and cyclohexane, which are more significant than in pure water and Tween 80. This study demonstrated the viability of the clathrate hydrate technique as a green technology for the treatment of colored wastewater effluents from different industries.

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“…seawater desalination [59][60][61], phase transfer materials [62,63], and even electrical power supply [64].…”

Section: Introductionmentioning

confidence: 99%

“…Considering the fact that 1 m³ of methane hydrate can store up to 164 Nm³ of gas [50], hydrate storage and transportation systems show a vast potential in view of a safe and cost‐efficient alternative toward conventional natural gas storage and transport methods in form of compressed or liquefied natural gas [51–55]. In addition to these highly attractive technical applications of gas hydrates, other uses are conceivable and currently being researched and tested, namely, biogas handling [44, 56–58], seawater desalination [59–61], phase transfer materials [62, 63], and even electrical power supply [64].…”

Section: Introductionmentioning

confidence: 99%

Influence of different stirring setups on mass transport, gas hydrate formation, and scale transfer concepts for technical gas hydrate applications

2022

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This contribution describes the influence of turbulent flow conditions in the liquid and/or gas phase and directly in the phase interface, different flow patterns (axial/radial), volume‐specific power inputs, mass‐specific energy consumptions, as well as volume‐specific mass transfer coefficients on the gas hydrate formation, derived from an experimental investigation of five different reactor setups. The results correspond to all fields of gas hydrate research, especially actually discussed technical hydrate applications, like hydrate‐based desalination, gas storage, gas separation, biogas and green hydrogen handling, carbon dioxide deposition, new phase transfer materials, and even electrical power supply. Two main objectives, first, to determine favorable hydrate forming conditions in stirred systems to provide competitive hydrate formation processes, and second, the search for a concept to enable the transfer of experimental results, for example, from a stirred reactor to a pipeline system for inhibitor research, through the targeted adjustment of similar and comparable turbulent flow conditions in different reactor setups could be achieved. So far, the targeted formation of gas hydrates has been investigated essentially from the point of view of optimizing the formation conditions with regard to pressure and temperature as well as the addition of auxiliary materials and promoters. In addition, some studies consider different reactor types and setups, for example, spray reactors or bubble columns. In many publications, stirred and cooled pressure autoclaves are described, whereby the gas and the liquid phase are brought into contact with each other by mixing to a greater or lesser extent by an agitator, then forming a solid gas hydrate phase. Often missing in previous research work is a systematic approach for determining the influence of flow conditions on gas hydrate formation. Many different influencing factors in a stirred reactor system can strongly affect the kinetics and formation of gas hydrates, for example, stirrer type, rotational frequency, stirrer and reactor geometry, and filling level. This is the starting point of the present investigation that deals with the influence of the flow conditions on the formation of gas hydrates. Tests were performed in a stirred autoclave to measure the effects of different stirrer configurations. The results obtained contribute to the explanation of the hydrate formation mechanism and can be used to optimize the targeted production of gas hydrates in technical hydrate applications. A rapid, immediate, hydrate formation is advantageous and can be achieved by suitable flow conditions in stirred reactors, which is successfully proven within this study contribution.

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Electric power control of a power generator using dissociation expansion of a gas hydrate

Cited by 12 publications

References 13 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

Colored Wastewater Treatment by Clathrate Hydrate Technique

Influence of different stirring setups on mass transport, gas hydrate formation, and scale transfer concepts for technical gas hydrate applications

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