Thermodynamic analysis of a Brayton cycle and Rankine cycle arranged in series exploiting the cold exergy of LNG (liquefied natural gas)

-In this work a thermodynamic performance analysis is carried out for a combined cycle consisted of an organic Rankine cycle (ORC) and a LNG cycle. The combined system uses a low grade waste heat in the form of sensible energy and the LNG cold energy is used for power generation as well as for heat sink. The effects of the key parameters of th system such as turbine inlet pressure, condensation temperature and source temperature on the characteristics of system are throughly investigated. The simulation results show that the thermodynamic performance of the combined system can be significantly improved compared to the normal ORC which is not using the LNG cold energy.

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Section: Fig 1 Schematic Diagram Of the Systemunclassified

Thermodynamic Performance Characteristics of Organic Rankine Cycle (ORC) using LNG Cold Energy

Kim¹,

Ha²,

Kim

2014

Journal of the Korean Institute of Gas

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“…The cold energy of LNG can be applied to all the processes that need cold, such as power generation (Oshima et al, 1978;Griepentrog et al, 2008;Shi et al, 2009;Shi et al, 2010;Liu et al, 2012;Song et al, 2012;Choi et al, 2013;Dong et al, 2013;Rao et al, 2013;Wang et al, 2013;Zhang et al, 2013;Arsalis et al, 2014;Gmez et al, 2014;Shu et al, 2014;Franco et al, 2015;Stradioto et al, 2015;Gmez et al, 2016;Sung et al, 2016;Bao et al, 2017;Ghaebi et al, 2018), cryogenic air separation (Bian et al, 2011;Xu et al, 2013;Xu et al, 2014;Mehrpooya et al, 2015;Zheng et al, 2015;Mehrpooya et al, 2016;Tesch et al, 2016;Ebrahimi et al, 2017;, seawater desalination (Cravalho et al, 1977;Shaik et al, 2006;Wang et al, 2012;Cao et al, 2015;Chang et al, 2016;Cherchi et al, 2017;Lin et al, 2017), cold storage (Messineo et al, 2008;Messineo et al, 2011), refrigeration (Mehmet, 2002;Kalinowski et al, 2009;He et al, 2015;…”

Section: Lng Cold Energy Utilizationmentioning

confidence: 99%

Review on recent liquefied natural gas cold energy utilization in power generation cycles

Jia

Dai³

2018

Adv. Geo-Energy Res.

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Liquefied natural gas (LNG) needs to be gasified before supplied to the users, and considerable amount of cold energy, about 830 kJ/kg, will be released during this process. Recovery of LNG cold energy bears significance of energy-saving and environmental protection. Among the many ways of using LNG cold energy, power generation is the most effective and suitable one for large-scale applications. Many novel power generation cycles have been designed for utilizing LNG cold energy so far. This paper reviews the recent researches on LNG cold energy utilization in power generation, and discusses 15 novel power generation cycles utilizing LNG cold energy.

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“…LNG can be also used as a heat sink in a power cycle using ambient or waste heat as the heat source. The most popular cold power cycles are: the direct expansion cycle [20], the Rankine cycle [21][22][23], the Brayton cycle [24], the absorption power cycle [25], the Stirling cycle [26][27][28] and combined cycles [29][30][31][32]. In most existing cryogenic plants, the recovery method for LNG exergy is based on direct expansion and ORC cycles [14].…”

Section: Introductionmentioning

confidence: 99%

Exergetic Analysis, Optimization and Comparison of LNG Cold Exergy Recovery Systems for Transportation

Dorosz

Wojcieszak

Malecha

2018

Entropy

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LNG (Liquefied Natural Gas) shares in the global energy market is steadily increasing. One possible application of LNG is as a fuel for transportation. Stricter air pollution regulations and emission controls have made the natural gas a promising alternative to liquid petroleum fuels, especially in the case of heavy transport. However, in most LNG-fueled vehicles, the physical exergy of LNG is destroyed in the regasification process. This paper investigates possible LNG exergy recovery systems for transportation. The analyses focus on "cold energy" recovery systems as the enthalpy of LNG, which may be used as cooling power in air conditioning or refrigeration. Moreover, four exergy recovery systems that use LNG as a low temperature heat sink to produce electric power are analyzed. This includes single-stage and two-stage direct expansion systems, an ORC (Organic Rankine Cycle) system, and a combined system (ORC + direct expansion). The optimization of the above-mentioned LNG power cycles and exergy analyses are also discussed, with the identification of exergy loss in all components. The analyzed systems achieved exergetic efficiencies in the range of 20% to 36%, which corresponds to a net work in the range of 214 to 380 kJ/kg LNG .

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Thermodynamic analysis of a Brayton cycle and Rankine cycle arranged in series exploiting the cold exergy of LNG (liquefied natural gas)

Cited by 108 publications

References 26 publications

Thermodynamic Performance Characteristics of Organic Rankine Cycle (ORC) using LNG Cold Energy

Thermodynamic Performance Characteristics of Organic Rankine Cycle (ORC) using LNG Cold Energy

Review on recent liquefied natural gas cold energy utilization in power generation cycles

Exergetic Analysis, Optimization and Comparison of LNG Cold Exergy Recovery Systems for Transportation

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