Performance analysis of the closed Brayton power cycle in a small-scale pebble bed gas cooled reactor using different working fluids

Alali, Abdullah E.; Al-Shboul, Khaled F.

doi:10.1016/j.anucene.2018.07.040

Cited by 18 publications

(3 citation statements)

References 18 publications

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“…Since the SCO 2 Brayton cycle has the advantages of a small volume of components, high efficiency under a medium or high temperature heat source, and environmental friendliness, its application in nuclear energy has been widely explored in recent years. Alali and Al-Shboul [3] applied the Brayton cycle in high-temperature gas-cooled reactor studies with air, nitrogen, SCO 2 and helium as working media. The results show that the helium cycle has the highest power efficiency and the SCO 2 cycle has the highest cogeneration efficiency.…”

Section: Introductionmentioning

confidence: 99%

Analyses and optimization of the CFETR power conversion system with a new supercritical CO₂ Brayton cycle

et al. 2023

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The Chinese Fusion Engineering Testing Reactor (CFETR) power conversion system with Supercritical CO2 (SCO2) Brayton cycle is designed, analyzed and optimized at present. Considering the pulse operation of the reactor, a heat storage loop with high temperature molten salt and low temperature concrete is introduced. Based on the parameters of the first cooling loop, the CFETR power conversion loop is designed and studied. A new SCO2 Brayton cycle for the CFETR dual heat sources, blanket and divertor, is developed and optimized by genetic algorithm. Compared to other simple and recompression cycles, it is shown that the new SCO2 Brayton cycle has the maximum thermal efficiency with simplicity. The exergy analyses are carried out and show that the exergy destruction rates of turbine and heat exchangers between different loops are the largest due to the large turbine power and the large temperature difference. The exergoeconomic analyses show that fusion reactor accounts for the main cost, which is the key to the economy of fusion power generation. The following sensitivity analyses show that the hot molten salt temperature has a major influence on the system performance. Finally, several multi-criteria optimization algorithms are introduced to simultaneously optimize the three fitness functions, the cycle thermal efficiency, the system exergy efficiency and the total system product unit cost. It is found that the maximum thermal efficiency, the maximum exergy efficiency and the lowest total system product unit cost can be obtained almost simultaneously for the new CFETR power conversion system, and the optimal operation scheme is given in the end.

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Section: Introductionmentioning

confidence: 99%

Analyses and optimization of the CFETR power conversion system with a new supercritical CO₂ Brayton cycle

et al. 2023

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“…To this end, numerous studies have been conducted, and researchers have investigated various hybrid systems. Naserian et al [14] studied the cycle introduced by Alali and Al-Shaboul [15] and launched a closed Brayton cycle using waste heat from a nuclear reactor. They also used the exhaust gases from the Brayton cycle to produce steam and heating.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic feasibility and multiobjective optimization of a closed Brayton cycle-based clean cogeneration system

Rad,

Tayyeban,

Assareh

et al. 2023

J Therm Anal Calorim

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The present research has analyzed the energy and exergy of a combined system of simultaneous power generation and cooling. To provide a comprehensive data sheet of this system, the system has been investigated in the temperature range of 300–800 °C, and 6 working fluids, including air, carbon dioxide, nitrogen, argon, xenon, and helium, have been investigated. The parameters affecting the performance of the system, namely the compressor inlet pressure, the compressor pressure ratio, and the intermediation pressure ratio were investigated. The power produced by the Brayton cycle at a pressure ratio of 5.2 is the highest due to the increase in compressor power consumption and turbine power generation. The results of the parametric study showed that the exergy efficiency of the system has the maximum value at the pressure ratio of 4.73. The results of the parametric study showed that increasing the pressure of the compressor does not have a significant effect on the electricity consumption and the temperature of the working fluid due to the constant pressure ratio. The input energy to the heat exchanger of the absorption chiller decreases with the increase in the Brayton cycle pressure ratio, and as a result, the cooling created by the chiller also decreases. In this method, three objective functions of exergy efficiency, energy efficiency, and total production power are considered as objective functions. The most optimal value of intermediation pressure ratio was obtained after the optimization process of 1.389. Also, the most optimal value of the pressure ratio of high-pressure and low-pressure turbines was reported as 2.563 and 1.845, respectively.

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“…It is estimated that the advantages of helium as a working fluid can be beneficial not only in power cycles; even the possibility of using it in closed cycles for propulsion purposes is being studied, achieving better performance at a low scale [36]. Regarding the use of helium in Brayton cycles, it can represent essential advantages such as high efficiency [37], good heat transfer coefficients, and lower pressure losses [6], which favors the use of solar concentration systems [38].…”

Section: Introductionmentioning

confidence: 99%

Alternatives to Improve Performance and Operation of a Hybrid Solar Thermal Power Plant Using Hybrid Closed Brayton Cycle

2022

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Hybrid solar thermal power plants using the Brayton cycle are currently of great interest as they have proven to be technically feasible. This study evaluates mechanisms to reduce fuel consumption and increase the power generated, improving plant efficiency. An energy and exergy model for the hybrid solar plant is developed using an estimation model for the solar resource to determine the plant operation under specific environmental conditions. The effect of using different working fluids in the Brayton cycle, such as air, and helium in transcritical conditions and carbon dioxide in subcritical and supercritical conditions, is evaluated. Additionally, the plant's exergy destruction and exergy efficiency are evaluated. In those, it can be highlighted that the helium cycle in the same operating conditions compared to other working fluids can increase the power by 160%, increasing fuel consumption by more than 390%.

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Performance analysis of the closed Brayton power cycle in a small-scale pebble bed gas cooled reactor using different working fluids

Cited by 18 publications

References 18 publications

Analyses and optimization of the CFETR power conversion system with a new supercritical CO₂ Brayton cycle

Analyses and optimization of the CFETR power conversion system with a new supercritical CO₂ Brayton cycle

Thermodynamic feasibility and multiobjective optimization of a closed Brayton cycle-based clean cogeneration system

Alternatives to Improve Performance and Operation of a Hybrid Solar Thermal Power Plant Using Hybrid Closed Brayton Cycle

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Performance analysis of the closed Brayton power cycle in a small-scale pebble bed gas cooled reactor using different working fluids

Cited by 18 publications

References 18 publications

Analyses and optimization of the CFETR power conversion system with a new supercritical CO2 Brayton cycle

Analyses and optimization of the CFETR power conversion system with a new supercritical CO2 Brayton cycle

Thermodynamic feasibility and multiobjective optimization of a closed Brayton cycle-based clean cogeneration system

Alternatives to Improve Performance and Operation of a Hybrid Solar Thermal Power Plant Using Hybrid Closed Brayton Cycle

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Analyses and optimization of the CFETR power conversion system with a new supercritical CO₂ Brayton cycle

Analyses and optimization of the CFETR power conversion system with a new supercritical CO₂ Brayton cycle