New cold-level utilization scheme for cascade three-level rankine cycle using the cold energy of liquefied natural gas

Shou-guang, Yao; Xu, Likang; Liang, Tang

doi:10.2298/tsci171012239y

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…The water (30 and 33) circulating through the preheater traps (T) and FT coil is subcooled (34) in the condenser/drain cooler (DC), returning to the FT. With regard to the boiler combustion process, the BOG consumed ( 16) reacts with the air driven by the forced draft fan (FDF) (35-36). The flue gases (37) enter the economiser, decrease in temperature (38) and increase the temperature of the water (23) to a value close to that of saturated liquid.…”

Section: Regasification Systemsmentioning

confidence: 99%

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Energy, exergy and economic analysis of offshore regasification systems

Naveiro

Gómez

Insua

et al. 2021

Intl J of Energy Research

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Energy, exergy and economic analysis are proposed herein to evaluate regasification systems in Floating Storage Regasification Units (FSRUs). Three regasification systems typical in these types of vessels are considered: seawater system, open loop propane system and closed loop water-glycol system. The energy and exergy analyses were performed using the Engineering Equation Solver (EES), while Suite AspenONE programmes were used for the economic assessment. The exergy analysis provides a better understanding of the components of physical exergy (thermal and mechanical exergy) in order to define an exergy efficiency applicable to any liquefied natural gas (LNG) regasification system or FSRU. The results obtained prove the seawater regasification system to be most efficient from an energy and exergy standpoint. The specific energy consumption and exergy efficiency for this system are 227.33 kJ/kg and 50.00%, respectively. On the other hand, the open loop propane regasification system is most cost-effective for an LNG price between 1.32 and 11 USD/MMBtu. The vast amounts of destroyed exergy in the regasification process of current systems was also demonstrated and hence the need to develop new, more efficient configurations that could exploit the cold energy of LNG.

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Section: Regasification Systemsmentioning

confidence: 99%

“…In this case, the 3‐ORC with partial expander improves the energy and exergy efficiency by 2.3 times compared to 1‐ORC with propane. To achieve higher exergy efficiency, Yao et al 23 propose cascade three‐level ORCs as an alternative to ORCs in series.…”

Section: Introductionmentioning

confidence: 99%

Energy, exergy and economic analysis of offshore regasification systems

Naveiro

Gómez

Insua

et al. 2021

Intl J of Energy Research

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“…The latter component expands part of the regasified NG to supply the fuel gas consumed in the engines. Regarding cascaded ORCs, Yao et al [22] evaluate two three-stage configurations, while Xu and Lin [23] propose two power cycles: a novel three-stage and a four-stage configuration. Based on the results obtained from these studies, cascade configurations allow higher exergy efficiencies to be achieved than cycles in series.…”

Section: Introductionmentioning

confidence: 99%

Energy, exergy, economic and environmental analysis of a regasification system integrating simple ORC and LNG open power cycle in floating storage regasification units

Naveiro¹

2023

Brodogradnja

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A thermodynamic, economic and environmental analysis of a regasification system including a simple Organic Rankine Cycle (ORC) and an Open Organic Rankine Cycle (OC) to utilise the liquefied natural gas (LNG) cold energy is carried out in the present paper. The proposed system, called ORC-OC, uses ambient seawater as heat source (open loop) and is implemented on board a Floating Storage Regasification Unit (FSRU) in order to reduce the greenhouse gas (GHG) emissions associated with the electricity generation plant, i.e., dual fuel (DF) engines. Regarding the ORC working fluids analysed, an ethane/propane zeotropic mixture is applied. The ORC-OC is compared with the simple ORC architecture, giving the first one better energy (lower specific energy consumption), exergy (higher exergy efficiency) and environmental (lower CO2e emissions) results. When compared to the regasification systems installed on board, the ORC-OC system reduces the specific energy consumption by 86.99 % and increases the exergy efficiency by 17.82 % with respect to the most efficient conventional system installed on FSRUs (direct seawater regasification system), leading to a reduction of CO2e emissions of more than 80 %. In addition, the ORC-OC system is more cost-effective than conventional regasification systems when the LNG price is above 6,508 USD/MMBtu.

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“…Research on the application of the ORC with cold energy utilisation in FSRUs has focused on open loop regasification systems with ORC configurations both in series (up to three stages) [23][24][25] and in cascade (maximum four stages) [26,27] and the possible integration of waste heat from engine exhaust gases [28]. A summary of these works is shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and Economic Analyses of Zero-Emission Open Loop Offshore Regasification Systems Integrating ORC with Zeotropic Mixtures and LNG Open Power Cycle

Naveiro

Gómez²,

Fernández³

et al. 2022

Energies

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The present study provides an energy, exergy and economic analysis of a seawater regasification system (open loop) combining stages of simple organic Rankine cycles (ORCs) arranged in series with an open organic Rankine cycle (OC) in order to exploit the cold energy of liquefied natural gas (LNG). The proposed system, termed ORC-OC, is implemented in a Floating Storage Regasification Unit (FSRU) to achieve the objective of zero greenhouse emissions during the regasification process. Configurations of up to three stages of ORCs and the use of zeotropic mixtures of ethane/propane and n-butane/propane as working fluids are considered in the study of the novel regasification system. Only the two-stage ORC-OC (2ORC-OC) and three-stage (3ORC-OC) configurations accomplish the objective of zero emissions, attaining exergy efficiencies of 61.80% and 62.04%, respectively. The overall cost rate of the latter, however, is 20.85% greater, so the 2ORC-OC results as being more cost-effective. A comparison with conventional regasification systems installed on board shows that the 2ORC-OC yields a lower total cost rate if the LNG price exceeds 8.903 USD/MMBtu. This value could be reduced, however, if the electrical power that exceeds the FSRU’s demand is exported and if compact heat exchangers are implemented.

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New cold-level utilization scheme for cascade three-level rankine cycle using the cold energy of liquefied natural gas

Cited by 7 publications

References 9 publications

Energy, exergy and economic analysis of offshore regasification systems

Energy, exergy and economic analysis of offshore regasification systems

Energy, exergy, economic and environmental analysis of a regasification system integrating simple ORC and LNG open power cycle in floating storage regasification units

Thermodynamic and Economic Analyses of Zero-Emission Open Loop Offshore Regasification Systems Integrating ORC with Zeotropic Mixtures and LNG Open Power Cycle

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