About LNG Energy Utilization Efficiency Estimation

Blagin, E.V.; Uglanov, D.A.; Dovgyallo, A.I.

doi:10.1016/j.proeng.2016.07.693

Cited by 15 publications

(5 citation statements)

References 4 publications

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“…From the point of view of cryogenic working fluid cold energy utilization it is possible to estimate an efficiency of its utilization. The algorithm of cold energy values calculation is presented in [11]. Compressor delivery is related to a cold energy value which is calculated by expression:…”

Section: Modelling Resultsmentioning

confidence: 99%

Numerical Modeling of Non-stationary Processes in Cryogenic Mechanical Thermocompressor

Blagin¹,

Dovgyallo²,

Uglanov³

2017

IJMERR

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Mechanical thermocompressor is suited for gas compression with constant volume by means of heat addition. Its classic modelling theories usually do not take into account non-isothermal conditions of its chambers. This article deals with thermocompressor modelling with nonisothermal hot and cold chambers. The results of the modelling show significant loss (16.45%) of compressor delivery due to non-isothermal conditions of its chambers. Maximal mass mean temperature deviations for cold and hot chambers are equal to 14.98% and-8.5% correspondingly. 

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Section: Modelling Resultsmentioning

confidence: 99%

Numerical Modeling of Non-stationary Processes in Cryogenic Mechanical Thermocompressor

Blagin¹,

Dovgyallo²,

Uglanov³

2017

IJMERR

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“…Systems that require refrigeration or cooling are being developed in such a way that the cold energy possessed by LNG can be utilized [23,24]. Power generation, desalination, air separation and fractionation, and carbon dioxide liquefaction are examples of these systems [25,26].…”

Section: Applications Of Cold Utilization Of Lngmentioning

confidence: 99%

Recent Progress in Cold Utilization of Liquefied Natural Gas

Shingan

Parthasarthy

2023

Chem Eng & Technol

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Liquefaction of natural gas occurs at –162 °C and atmospheric pressure for transporting it over long distances. In the customer's segment, the liquefied natural gas is regasified before distribution. Around 830 kJ kg−1 energy is required for the production of liquefied natural gas and is often saved as cold energy, which can be reused by regasification terminals. Hence, for the past few years, cold energy utilization has been an important topic of research in the energy sector. The different techniques to utilize cold energy for power generation, air fractionation, extraction of natural gas liquids, refrigeration systems, desalination, and dry ice manufacturing are reviewed and discussed. Applying the cold utilization of LNG technique in these systems can help to improve efficiency and decrease operating costs effectively.

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“…Part of this energy (ideally, the exergy) could be recovered. Technical applications for exergy recovery of cryogenic substances can be found mostly in liquefied natural gas regasification [7][8][9][10][11][12][13][14][15] , but also for example for liquid nitrogen 16 . For hydrogen 17,18 , technical implementations are rarely considered and thermodynamically ideal cryogenic hydrogen exergy utilization systems as well as hydrogen conditioning systems for FCSs in general are currently (to the best knowledge of the authors) not considered in literature.…”

Section: List Of Symbols Roman Letters C Pmentioning

confidence: 99%

Synergies of fuel cell system thermal management and cryogenic hydrogen exergy utilization

Lenger

Heinke

Tegethoff

et al. 2022

Sci Rep

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Low-temperature polymer electrolyte fuel cell systems (FCSs) need to reject large amounts of low temperature heat. Often a mobile FCS’s cooling capacity limits the FCS power output. Cryogenic hydrogen is typically utilized as a direct heat sink using heat exchangers (HXs), even though HXs destroy most hydrogen exergy. This paper investigates synergies between FCS thermal management and cryogenic hydrogen exergy utilization in terms of their benchmark performance: the FCS coolant circuit supplies heat at coolant temperature level to a so named reversible cryogenic exergy utilization system (rCEUS) comprised of thermodynamically ideal heat engine processes. The rCEUS converts this heat partly to electrical energy (the value of which equals the hydrogen exergy) and rejects remaining heat to hydrogen to heat it to coolant temperature. The rCEUS output power is used to support the FCS, so the FCS rejects less heat and a significant fraction of this heat is utilized by the rCEUS. As a result, significantly less heat has to be transferred to ambient and the fuel demand decreases. In this paper, three hydrogen storage options are compared: liquid hydrogen, subcooled liquid hydrogen and cryo-compressed hydrogen. Different para- and orthohydrogen compositions are evaluated. For typical FCS operating points, rejected FCS heat to ambient is reducible by 40–67%. FCS power demand is reducible by 14–31%. FCS rejected heat to ambient reduction is 4.5–8 times larger than that of conventional HXs. Calculations are based on hydrogen’s lower heating value.

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About LNG Energy Utilization Efficiency Estimation

Cited by 15 publications

References 4 publications

Numerical Modeling of Non-stationary Processes in Cryogenic Mechanical Thermocompressor

Numerical Modeling of Non-stationary Processes in Cryogenic Mechanical Thermocompressor

Recent Progress in Cold Utilization of Liquefied Natural Gas

Synergies of fuel cell system thermal management and cryogenic hydrogen exergy utilization

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