Thermodynamic Cycle Selection for Distributed Natural Gas Liquefaction

Barclay, M. A.

doi:10.1063/1.1774669

Cited by 16 publications

(8 citation statements)

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“…Two basic changes have become the main factor of the LNG industry development and improvement all over the world that the most important one is decreasing the cost of production. Barclay et al (2004) presented an excellent review on the selection of thermodynamic refrigeration cycle for distributed natural gas liquefaction. Joule-Thomson cycle with mixed refrigerant (MR) is recommended to take advantages of lower capital costs, as it employs a throttle valve (isenthalpic expansion) with two-phase refrigerant.…”

Section: Introductionmentioning

confidence: 99%

Energy and exergy analyses of dual refrigerant system for liquefaction of natural gas

Afrand

Targhi

Khanmohammadi

2020

IJEX

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Present study proceeds thermodynamic modelling, and analysis of dual refrigerant system for liquefaction of natural gas (LNG) that is one of the most important technologies in producing LNG. Using energy equations pressure, quality, enthalpy, entropy of natural gas and two refrigerants, i.e., methane and propane are specified. The effects of different cycle variables on the thermodynamic performance especially the coefficient of performance (COP) is studied. Using the second law of thermodynamic for the system components, the exergy destruction rates has been found. The exergy analysis results show that heat exchanger I (HX I), heat exchanger II (HX II) and turbine have the highest exergy destruction rate. Furthermore, results indicate that the total exergy destruction rate of studied cycle for generation of 1 kg/s LNG is 2,996 kW. Moreover, energy and exergy analysis show that important parameters such as propane mass flow rate has different effects on the COP and exergy destruction rate.

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Section: Introductionmentioning

confidence: 99%

Energy and exergy analyses of dual refrigerant system for liquefaction of natural gas

Afrand

Targhi

Khanmohammadi

2020

IJEX

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“…Turbine-based processes offer the advantages of safety, easy startup, and a small layout. However, they have been rejected in onshore applications, because of low efficiency in terms of compression power requirements. − Therefore, continuous investigation is required for nonflammable refrigerant-based natural gas liquefaction cyle in FLNG, because of its inherent safety and rising demand for small-scale reservoirs, despite relatively low efficiency, compared to the hydrocarbon refrigeration cycle…”

Section: Introductionmentioning

confidence: 99%

Process Design for the Offshore Production of Liquefied Natural Gas with Nonflammable Refrigerants

Lee

Song

Shin

et al. 2015

Ind. Eng. Chem. Res.

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In this paper, a conceptual process design for a novel natural gas liquefaction plant developed especially for offshore application is presented. Onshore liquefied natural gas (LNG) production usually utilizes mixed refrigerant (MR)-based cycles for high efficiency, in terms of operating cost. This paper proposes a cascade process that uses nitrous oxide and nitrogen refrigerants. The liquefaction process can be subdivided into a precooling section in the vapor phase, a condensation section, and a subcooling section in the liquid phase. The vapor compression refrigeration cycle of nitrous oxide is applied to the precooling and the condensation sections, whereas the gas compression refrigeration cycle of nitrogen is applied to the subcooling section of LNG. The proposed process shows enhanced efficiency, compared to the conventional turbine-based processes with the specific power comparable to the MR processes.

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“…Over the past decade, there have been efforts to purify and liquefy methane into liquefied natural gas (LNG) for high energy-density storage and transportation at a moderate pressure (1)(2)(3)(4) . For continuous production of LNG from LFG, CO 2 should be removed, because its deposition as solid or frost would increase the flow resistance of passage and might cause a blockage after a period of operation.…”

Section: Introductionmentioning

confidence: 99%

“…A number of standard gas separation methods are applicable to the removal of CO 2 , including membrane, physical or chemical scrubbing, temperature or pressure swing adsorption (TSA or PSA), and distillation. The pilot-scale systems under recent development in U.S.A. (1,2) , China (3) , and Korea (4) have an LNG production rate at 160~2,350…”

Section: Introductionmentioning

confidence: 99%

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Cryogenic Heat-Exchanger Design for Freeze-out Removal of Carbon Dioxide from Landfill Gas

Chang

Chung

Park

2009

JTST

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A cryogenic heat exchanger to remove carbon dioxide from landfill gas (LFG) is proposed and designed for applications to LNG production in distributed-scale. Since the major components of LFG are methane and carbon dioxide, CO 2 removal is a significant pre-process in the liquefaction systems. A new and simple approach is proposed to directly remove carbon dioxide as frost on the surface wall along the cooling passage in a liquefying heat exchanger and to install two identical heat exchangers in parallel for alternative switching. As a first step of feasibility study, combined heat and mass transfer analysis is performed on the freeze-out process of CO 2 in a counterflow heat exchanger, where CH 4 -CO 2 mixture is cooled below its frost temperature in thermal contact with cold refrigerant. Engineering correlations for the analogy of heat and mass transfer are incorporated into numerical heat exchanger analysis with detailed fluid properties. The developed analytical model is used to estimate the distribution of CO 2 accumulation and the required heat exchanger size with latent thermal load for the cryogenic CO 2 removal in various operating conditions.

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Thermodynamic Cycle Selection for Distributed Natural Gas Liquefaction

Cited by 16 publications

References 0 publications

Energy and exergy analyses of dual refrigerant system for liquefaction of natural gas

Energy and exergy analyses of dual refrigerant system for liquefaction of natural gas

Process Design for the Offshore Production of Liquefied Natural Gas with Nonflammable Refrigerants

Cryogenic Heat-Exchanger Design for Freeze-out Removal of Carbon Dioxide from Landfill Gas

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