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Supercritical CO2 Rankine cycles for waste heat recovery from gas turbine

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  • Kim, Young Min
  • Sohn, Jeong Lak
  • Yoon, Eui Soo

Abstract

A supercritical carbon dioxide (S-CO2) Rankine cycle for waste heat recovery (WHR) from a gas turbine can achieve high efficiency despite its simplicity and compactness in comparison to a steam/water cycle. With respect to WHR, it is very important to maximize the net output power by incorporating the utilization efficiency of the waste heat in conjunction with the cycle thermal efficiency. A simple S-CO2 Rankine cycle used for a high-temperature source cannot fully utilize the waste heat because the working fluid is preheated by the recuperator to a high temperature to achieve a high cycle efficiency. To recover the remaining waste heat from a simple cycle, a cascade cycle with a low-temperature (LT) loop can be added to the high-temperature (HT) loop, or a split cycle—in which the flow after the pump is split and preheated by the recuperator and LT heater separately, before the HT heater can be used. This study presents a comparison of three cycles in terms of energy and exergy analyses of their systems. The results show that a split cycle can produce the highest power of the threes systems considered over a wide range of operating conditions. The reasons for this are explained in detail.

Suggested Citation

  • Kim, Young Min & Sohn, Jeong Lak & Yoon, Eui Soo, 2017. "Supercritical CO2 Rankine cycles for waste heat recovery from gas turbine," Energy, Elsevier, vol. 118(C), pages 893-905.
    • Handle: RePEc:eee:energy:v:118:y:2017:i:c:p:893-905
    DOI: 10.1016/j.energy.2016.10.106
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    References listed on IDEAS

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    1. Kim, Young Min & Shin, Dong Gil & Kim, Chang Gi & Cho, Gyu Baek, 2016. "Single-loop organic Rankine cycles for engine waste heat recovery using both low- and high-temperature heat sources," Energy, Elsevier, vol. 96(C), pages 482-494.
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    3. Kim, Y.M. & Kim, C.G. & Favrat, D., 2012. "Transcritical or supercritical CO2 cycles using both low- and high-temperature heat sources," Energy, Elsevier, vol. 43(1), pages 402-415.
    4. Sarkar, Jahar, 2009. "Second law analysis of supercritical CO2 recompression Brayton cycle," Energy, Elsevier, vol. 34(9), pages 1172-1178.
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