Preliminary design and part-load performance analysis of a recompression supercritical carbon dioxide cycle combined with a transcritical carbon dioxide cycle

Continuing efforts to increase the efficiency of utility-scale electricity generation has resulted in considerable interest in Brayton cycles operating with supercritical carbon dioxide (S-CO2). One of the advantages of S-CO2 Brayton cycles, compared to the more traditional steam Rankine cycle, is that equal or greater thermal efficiencies can be realized using significantly smaller turbomachinery. Another advantage is that heat rejection is not limited by the saturation temperature of the working fluid, facilitating dry cooling of the cycle (i.e., the use of ambient air as the sole heat rejection medium). While dry cooling is especially advantageous for power generation in arid climates, the reduction in water consumption at any location is of growing interest due to likely tighter environmental regulations being enacted in the future. Daily and seasonal weather variations coupled with electric load variations means the plant will operate away from its design point the majority of the year. Models capable of predicting the off-design and part-load performance of S-CO2 power cycles are necessary for evaluating cycle configurations and turbomachinery designs. This paper presents a flexible modeling methodology capable of predicting the steady state performance of various S-CO2 cycle configurations for both design and off-design ambient conditions, including part-load plant operation. The models assume supercritical CO2 as the working fluid for both a simple recuperated Brayton cycle and a more complex recompression Brayton cycle.

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Performance analysis and parametric optimization of supercritical carbon dioxide (S-CO2) cycle with bottoming Organic Rankine Cycle (ORC)

Energy ◽

10.1016/j.energy.2017.10.136 ◽

2018 ◽

Vol 143 ◽

pp. 406-416 ◽

Cited By ~ 52

Author(s):

Jian Song ◽

Xue-song Li ◽

Xiao-dong Ren ◽

Chun-wei Gu

Keyword(s):

Carbon Dioxide ◽

Performance Analysis ◽

Supercritical Carbon Dioxide ◽

Parametric Optimization ◽

Organic Rankine Cycle ◽

Rankine Cycle ◽

Supercritical Carbon

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Performance Analysis of Solar Tower Power Plants Driven Supercritical Carbon Dioxide Recompression Cycles for Six Different Locations in Saudi Arabia

Proceedings of the ISES Solar World Congress 2015 ◽

10.18086/swc.2015.04.16 ◽

2016 ◽

Author(s):

F. Al-Sulaiman ◽

Maimoon Atif ◽

Hafiz Abd-ur-rahman

Keyword(s):

Carbon Dioxide ◽

Saudi Arabia ◽

Performance Analysis ◽

Supercritical Carbon Dioxide ◽

Power Plants ◽

Supercritical Carbon

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Research on a Transonic Supercritical Carbon Dioxide Centrifugal Turbine

Journal of Nuclear Engineering and Radiation Science ◽

10.1115/1.4043295 ◽

2019 ◽

Vol 5 (4) ◽

Author(s):

Zehai Yang ◽

Dan Luo ◽

Diangui Huang

Keyword(s):

Carbon Dioxide ◽

Numerical Simulation ◽

Performance Analysis ◽

Supercritical Carbon Dioxide ◽

Energy Conversion ◽

High Efficiency ◽

Low Cost ◽

Thermodynamic Cycle ◽

Stable Operation ◽

Supercritical Carbon

Recently, the supercritical carbon dioxide Brayton (SCO2) cycle gained a lot of attention for its application to next-generation nuclear reactors. Turbine is the key component of the energy conversion in the thermodynamic cycle. Transonic centrifugal turbine has advantages of compatibility of aerodynamic and geometric, low cost, high power density, and high efficiency; therefore, it has opportunity to become the main energy conversion equipment in the future. In this paper, a transonic nozzle and its corresponding rotor cascade of the single-stage centrifugal turbine were designed. In addition, the three-dimensional (3D) numerical simulation and performance analysis were conducted. The numerical simulation results show that the predicted flow field is as expected and the aerodynamic parameters are in good agreement with one-dimensional (1D) design. Meanwhile, the off-design performance analysis shows that the transonic centrifugal turbine stage has wide stable operation range and strong load adaptability. Therefore, it can be concluded that the proposed turbine blade has good performance characteristics.

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