Thermoeconomic and environmental assessments of a combined cycle for the small scale LNG cold utilization

Kanbur, Barış Burak; Xiang, Liming; Dubey, Swapnil; Choo, Fook Hoong; Duan, Fei

doi:10.1016/j.apenergy.2017.01.061

Cited by 46 publications

(26 citation statements)

References 43 publications

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“…The first proposed design was called as the single system since it only includes a microturbine to generate power in the designed small‐scale LNG cold‐utilized power generation system . To improve the thermodynamic performance, a Stirling engine was integrated between the LNG vaporizer and waste heat of microturbine in the second system; hereby, the second system was called as the combined system . After that, the LNG vaporizer was considered as the heat sink to cool down the compressor inlet air in the third system; therefore, it was called as the LNG cold‐utilized inlet air‐cooled system.…”

Section: Introductionmentioning

confidence: 89%

“…The nitrogen is circulated in the cold thermofluid loop whereas the special heat transfer fluid, XCELTHERM MK1, is used in the hot thermofluid loop. By means of the heat transfer fluid usage in the hot thermofluid loop, the temperature difference between the inlet and outlet of hot heat exchanger becomes smaller since the heat transfer fluid has high calorific thermophysical properties . The smaller temperature difference makes the wall temperature of hot heat exchanger more uniform, which is a significant parameter for the effective operation of the Stirling engine in the applied engineering works.…”

Section: System Descriptionmentioning

confidence: 99%

“…After the required molar flow rates are calculated, the energy rates of the system streams in all the proposed designs can be found. Since the main focus of the current study is the enviroeconomic and thermoeconomic assessments, the details of the thermodynamic model are not presented, but they can be seen from Kanbur et al() for the single, combined, and CO 2 ‐reduced combined systems, respectively. After all the energy streams are calculated, the net generated work rate,

{\overset{W}{true}}_{n e t}

, can be obtained as given in Equations for the single, combined, and CO 2 ‐reduced combined systems in a sequence,

{\overset{W}{true}}_{n e t_{s i n g l e}} = {\overset{W}{true}}_{G T} - {\overset{W}{true}}_{C} - {\overset{W}{true}}_{L N G P u m p},

{\overset{W}{true}}_{n e t_{c o m b i n e d}} = {\overset{W}{true}}_{G T} + {\overset{W}{true}}_{S T} - {\overset{W}{true}}_{C} - {\overset{W}{true}}_{L N G P u m p},

{\overset{W}{true}}_{n e t_{C O 2 - r e d}} = {\overset{W}{true}}_{G T} + {\overset{W}{true}}_{S T} - {\overset{W}{true}}_{D C} - {\overset{W}{true}}_{C} - {\overset{W}{true}}_{L N G P u m p} .

…”

Section: Modelingmentioning

confidence: 99%

“…By means of the heat transfer fluid usage in the hot thermofluid loop, the temperature difference between the inlet and outlet of hot heat exchanger becomes smaller since the heat transfer fluid has high calorific thermophysical properties. 36 The smaller temperature difference makes the wall temperature of hot heat exchanger more uniform, which is a significant parameter for the effective operation of the Stirling engine in the applied engineering works. The microturbine and the hot water production-aimed heat exchangers constitute the microcogeneration system in the proposed small-scale LNG power generation systems.…”

Section: System Descriptionmentioning

confidence: 99%

“…35 To improve the thermodynamic performance, a Stirling engine was integrated between the LNG vaporizer and waste heat of microturbine in the second system; hereby, the second system was called as the combined system. 36 After that, the LNG vaporizer was considered as the heat sink to cool down the compressor inlet air in the third system; therefore, it was called as the LNG cold-utilized inlet air-cooled system. 28,37 However, the thermodynamic performance improvement was not seen significant when compared with the combined system.…”

Section: Introductionmentioning

confidence: 99%

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Life‐cycle‐integrated thermoeconomic and enviroeconomic assessments of the small‐scale‐liquefied natural gas cold utilization systems

et al. 2019

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Summary Small‐scale‐liquefied natural gas (LNG) cold‐utilized power generation systems are the sustainable solutions in the rural and inland areas where the large‐scale power generation is infeasible. This study investigates three different small‐scale LNG cold‐utilized power generation systems, which are called as the single, combined, and carbon dioxide (CO2)–reduced combined systems according to their design details. The assessments are done according to the life‐cycle‐based enviroeconomic and life‐cycle‐integrated thermoeconomic assessment (LCiTA) models that are recently developed and new approaches, in order to better monitor their feasibilities in real operations. The life‐cycle‐based enviroeconomic assessment shows that the combined system has the lowest environmental payback period with 7.35 years that is nearly 6 months and 1 year lower than the single and CO2‐reduced combined systems, respectively. The LCiTA study deduces that the combined system has the minimum levelized product cost while the single system has the highest values. The integration of CO2 capture components increases the levelized product cost nearly by 16.0% in the combined design, but the levelized product cost value is still found lower than the single system. Moreover, the sustainability performance of the systems is evaluated according to the improved sustainability index calculated by the life‐cycle‐integrated fuel and destruction costs. The index value of the combined system is twice that of the single system. The multiobjective optimization study is performed in cases of closed operation rooms. The best trade‐off points are found in the close ambient air temperature range between 300.50 and 302.00 K. To observe the dynamic outdoor performance, the finite sum approach is applied for the LCiTA model. The highest fluctuations are seen for the CO2‐reduced combined system while the smallest fluctuations belong to the combined system.

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Section: Introductionmentioning

confidence: 89%

Section: System Descriptionmentioning

confidence: 99%

{\overset{W}{true}}_{n e t}

, can be obtained as given in Equations for the single, combined, and CO 2 ‐reduced combined systems in a sequence,

{\overset{W}{true}}_{n e t_{s i n g l e}} = {\overset{W}{true}}_{G T} - {\overset{W}{true}}_{C} - {\overset{W}{true}}_{L N G P u m p},

{\overset{W}{true}}_{n e t_{c o m b i n e d}} = {\overset{W}{true}}_{G T} + {\overset{W}{true}}_{S T} - {\overset{W}{true}}_{C} - {\overset{W}{true}}_{L N G P u m p},

{\overset{W}{true}}_{n e t_{C O 2 - r e d}} = {\overset{W}{true}}_{G T} + {\overset{W}{true}}_{S T} - {\overset{W}{true}}_{D C} - {\overset{W}{true}}_{C} - {\overset{W}{true}}_{L N G P u m p} .

…”

Section: Modelingmentioning

confidence: 99%

Section: System Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Life‐cycle‐integrated thermoeconomic and enviroeconomic assessments of the small‐scale‐liquefied natural gas cold utilization systems

et al. 2019

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Thermoeconomic Analysis and Optimization of a Combined Supercritical CO₂ Recompression Brayton/Kalina Cycle Driven by Boil‐Off Gas Combustion and Liquefied Natural Gas Cold Energy

Pan

Zhu

et al. 2023

Energy Tech

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The energy and costs required to reliquefy the boil‐off gas (BOG) produced in liquefied natural gas (LNG) tanks are enormous. At the same time, LNG releases large amounts of cold energy during the regasification process. To recover both the BOG and the LNG cold energy for power generation, herein, a novel system consisting of a supercritical carbon dioxide recompression Brayton cycle, an ammonia–water mixture Kalina cycle, a BOG combustion turbine cycle, and a natural gas turbine cycle is presented. The genetic algorithm with multiple elite saving is used to optimize the system thermoeconomic performance, and the maximum energy efficiency, exergy efficiency, and net present value of 65.49%, 33.88%, and 7.374 × 107 $ are obtained respectively. The nondominated sorting genetic algorithm II is implemented to achieve the multiobjective optimization, and the comprehensive performance analysis is carried out on this basis. The results show that heat exchangers and turbines account for the highest exergy destruction and total cost proportion with the value of 76.5% and 81.1% respectively. The heat transfer curves between LNG and working fluids are well matched, and the cooling capacity for ammonia liquefaction is the largest, accounting for 66.66%, which also generates 581.2 kW of power generation. The results also indicate that the LNG cold energy cascade utilization system combined with BOG combustion has excellent thermodynamic performance and can obtain ideal economic benefits.

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Energy, exergy, and exergo‐economic analysis of a novel combined power system using the cold energy of liquified natural gas (LNG)

Özen

Uçar

2019

Env Prog and Sustain Energy

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This study proposed a novel combined power system that uses the cold energy of liquefied natural gas (LNG) for the BOTAŞ LNG receiving terminal located in Marmara Eregli in Turkey. In the proposed system, the main cycle was a Brayton cycle (BC), while the subcycles consisted of a supercritical CO2 cycle (S‐CO2) and an organic Rankine cycle (ORC). The combined power system was analyzed based on energy, exergy, and exergo‐economic. The effects of the determined decision variables (Compressor‐II input temperature, Compressor‐I‐II and Turbine‐I‐III isentropic efficiencies, CO2 cycle pressure rate, Turbine‐III input pressure, ORC pressure rate, and propane mass flow rate) on the exergo‐economic performance of the system were discussed, and the optimal points of the system were found. The base state of the system that had operational conditions and assumed design inputs was compared to the working conditions that were determined as a result of optimization, and a cost reduction of 67% was calculated.

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Thermoeconomic and environmental assessments of a combined cycle for the small scale LNG cold utilization

Cited by 46 publications

References 43 publications

Life‐cycle‐integrated thermoeconomic and enviroeconomic assessments of the small‐scale‐liquefied natural gas cold utilization systems

Life‐cycle‐integrated thermoeconomic and enviroeconomic assessments of the small‐scale‐liquefied natural gas cold utilization systems

Thermoeconomic Analysis and Optimization of a Combined Supercritical CO₂ Recompression Brayton/Kalina Cycle Driven by Boil‐Off Gas Combustion and Liquefied Natural Gas Cold Energy

Energy, exergy, and exergo‐economic analysis of a novel combined power system using the cold energy of liquified natural gas (LNG)

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Thermoeconomic and environmental assessments of a combined cycle for the small scale LNG cold utilization

Cited by 46 publications

References 43 publications

Life‐cycle‐integrated thermoeconomic and enviroeconomic assessments of the small‐scale‐liquefied natural gas cold utilization systems

Life‐cycle‐integrated thermoeconomic and enviroeconomic assessments of the small‐scale‐liquefied natural gas cold utilization systems

Thermoeconomic Analysis and Optimization of a Combined Supercritical CO2 Recompression Brayton/Kalina Cycle Driven by Boil‐Off Gas Combustion and Liquefied Natural Gas Cold Energy

Energy, exergy, and exergo‐economic analysis of a novel combined power system using the cold energy of liquified natural gas (LNG)

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Thermoeconomic Analysis and Optimization of a Combined Supercritical CO₂ Recompression Brayton/Kalina Cycle Driven by Boil‐Off Gas Combustion and Liquefied Natural Gas Cold Energy