Thermodynamic analysis for working fluids comparison in Rankine-type cycles exploiting the cryogenic exergy in Liquefied Natural Gas (LNG) regasification

Ferreira, Paulo Augusto Valente; Catarino, I.; Vaz, Daniel Cardoso

doi:10.1016/j.applthermaleng.2017.04.082

Cited by 59 publications

(13 citation statements)

References 22 publications

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“…Moreover, it is assumed that there is no pressure loss in the equipment and pipelines except for the throttle valve (Abdul Qyyum et al, 2018). And the conversion between electrical energy and mechanical energy is 100% (Ferreira et al, 2017).…”

Section: Optimization Of Smr Liquefaction Processmentioning

confidence: 99%

Optimization Design and Analysis of Single-Stage Mixed Refrigerant Liquefaction Process

Wang

Dai

et al. 2021

Front. Energy Res.

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Small-scale natural gas liquefaction processes have several clear advantages, particularly in the exploitation of ‘unconventional’ natural gas (NG) from sources such as difficult-to-access and offshore gas fields. Moreover, conventional liquefaction processes have a number of disadvantages such as high energy consumption, large cooling loads required in the refrigeration cycle, and non-uniform matching of cold and hot flows in liquified natural gas (LNG) heat exchanger (HE). The main objective of this study was to optimize the most commonly used mixed refrigerant process. The liquefaction performance of the optimized process was analyzed and the influence of gas parameters on the power consumption, exergy loss, freezing mixture circulation, and cooling water load were investigated. The results show that compressor power consumption can be reduced by 29.8%, the cooling water load can be reduced by 21.3%, and the system exergy efficiency can be increased by 41% with the optimized process. Furthermore, throttling and compression of the freezing mixture were increased during the refrigeration stage. It can be concluded that reducing the feed gas temperature and increasing the feed gas pressure can reduce the total power consumption, exergy loss, freezing mixture circulation, and cooling water load, which can significantly improve liquefaction performance.

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Section: Optimization Of Smr Liquefaction Processmentioning

confidence: 99%

Optimization Design and Analysis of Single-Stage Mixed Refrigerant Liquefaction Process

Wang

Dai

et al. 2021

Front. Energy Res.

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“…This paper is intended to fill this gap, and to provide sufficient knowledge‐based evidence and analysis to the decision makers in the LNG field that LNG regasification power plants deserve serious consideration. For more in‐depth and rigorous treatment of the subject matter, the numerous studies listed under references can be consulted.…”

Section: Lng Regasification Power Plants In Operationmentioning

confidence: 99%

Power generation potential of liquified natural gas regasification terminals

Çengel

2020

Int J Energy Res

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Summary The share of liquified natural gas (LNG) in the international trade of natural gas (NG) is continually increasing. This presents increasing opportunities to build power plants to generate electricity at LNG regasification terminals rather than wasting the power generation potential of LNG at about −162°C by regasifying it by seawater, ambient air, or by burning NG. Typically, over 5% of the NG received at LNG plants is used to liquify the remaining incoming gaseous NG at environmental conditions. Theoretically, all the energy consumed at LNG liquefaction plants can be recovered at LNG regasification terminals. In this study, the theoretical and practical power generation potential of regasified LNG is investigated by performing energy and exergy analyses. It is shown that up to 0.191 kWh of electric power can be generated during the regasification of LNG per standard m3 of NG regasified. The potential economic gains associated with power generation at LNG regasification facilities are demonstrated by analyzing the 2018 LNG imports of Turkey as a case study and the world. It is shown that the 314 million tons of LNG imported globally in 2018 has the electric power generation potential of 88 billion kWh with a market value of over 10 billion USD. It also has the potential to offset 38 million tons of CO2 emissions.

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“…that are suitable for black-box optimization and do not require any derivative information. ,,− However, none of these metaheuristic algorithms can guarantee a global optimal solution. Genetic algorithm (ga) has been successfully used for various chemical processes. ,,,, In this study, we use the ga solver for the outer level and fminbnd solver for the inner level. A sampling strategy based on LHS (Latin hypercube sampling) method is used to initialize the population for ga.…”

Section: Process Optimizationmentioning

confidence: 99%

“…Sun et al 18 optimized four schemes involving multicomponent working fluids and direct expansion to maximize the net power output of the process. Ferreira et al 19 considered ORC, direct expansion, and their combinations, and performed a multiobjective optimization for each scheme to maximize the net power output and minimize the total heat exchanger capacity. The authors modeled LNG as pure methane and allowed only pure components as working fluids within the ORC.…”

Section: ■ Introductionmentioning

confidence: 99%

Economic Feasibility of Power Generation by Recovering Cold Energy during LNG (Liquefied Natural Gas) Regasification

Dutta

Karimi

Farooq

2018

ACS Sustainable Chem. Eng.

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Liquefied natural gas (LNG) has emerged as the leading option for global natural gas trade. Imported LNG must be regasified at the receiving terminal. The practice of using seawater as the heat source for regasification is a sheer waste of the available cold energy in LNG. In this study, power generation from LNG cold energy is investigated to reverse this wastage. We have developed a superstructure for this power generation process (PGP) that includes direct expansion of LNG and organic Rankine cycle (ORC) with simultaneous selection of the working fluid components and their compositions. Using a simulation-based optimization paradigm, the economic viability of the PGP is investigated by maximizing its net present value (NPV). Our results show that although a PGP with both direct expansion and ORC has a higher exergy efficiency, its NPV is nearly 64% lower than that of a PGP with ORC only. We present case studies for various combinations of process parameters and found that LNG regasification pressure has the maximum impact on NPV of the PGP followed by LNG feed temperature and composition. The maximum-NPV PGP uses only ORC and produces a net power of about 0.5–12.9 kW/tLNG after satisfying the power demand of the LNG regasification process. The NPV is about $6.87–2.45 million; thus, power generation by recovering cold energy in an LNG regasification terminal is economically viable. We also present a robust process design strategy to handle uncertainties in LNG composition.

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Thermodynamic analysis for working fluids comparison in Rankine-type cycles exploiting the cryogenic exergy in Liquefied Natural Gas (LNG) regasification

Cited by 59 publications

References 22 publications

Optimization Design and Analysis of Single-Stage Mixed Refrigerant Liquefaction Process

Optimization Design and Analysis of Single-Stage Mixed Refrigerant Liquefaction Process

Power generation potential of liquified natural gas regasification terminals

Economic Feasibility of Power Generation by Recovering Cold Energy during LNG (Liquefied Natural Gas) Regasification

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