Thermodynamic investigation of intercooling location effect on supercritical CO2 recompression Brayton cycle

Sompop Jarungthammachote

doi:10.15282/jmes.15.3.2021.05.0649

Authors

Sompop Jarungthammachote Faculty of Engineering at Sriracha, Kasetsart University Sriracha Campus, 199 Sukhumvit Road, TungSukla, Sriracha, Chonburi, 20230, Thailand. Phone: +6638354580

DOI:

https://doi.org/10.15282/jmes.15.3.2021.05.0649

Keywords:

Supercritical CO2, recompression Brayton cycle, intercooling, ratio of pressure ratio, split fraction

Abstract

In S-CO₂ recompression Brayton cycle, use of intercooling is a way to improve the cycle efficiency. However, it may decrease the efficiency due to increase of heat rejection. In this work, two S-CO₂ recompression Brayton cycles are investigated using the thermodynamic model. The first cycle has intercoolings in a main compression and a recompression process (MCRCIC) and the second cycle has an intercooling in only the recompression process (RCIC). The thermal efficiencies of both cycles are compared with that of S-CO₂ recompression Brayton cycle with intercooling in the main compression process (MCIC). Effects of a split fraction (SF) and a ratio of pressure ratio of the recompression (RPR_RC) on the thermal efficiencies of MCRCIC and RCIC are also studied. The study results show that the intercooling of recompressor in MCRCIC and RCIC can reduce the compression power. However, it also rejects heat from the cycle and this leads to increasing added heat in the heater. The thermal efficiency of MCRCIC and RCIC are, then, lower than that of the MCIC. For the effects of RPR_RC and SF to the thermal efficiency of the cycles, in general, when RPR_RC increases, the thermal efficiency decreases due to increasing rejected heat. The increase in SF causes increasing thermal efficiency of the cycles and the thermal efficiency, then, decrease when SF is beyond the optimal value.

References

Y. Ahn, S.J. Bae, M. Kim, S.K. Cho, S.J. Baik, K.I. Lee, and J.E. Cha, “Review of supercritical CO2 power cycle technology and current status of research and development,” Nucl. Energy Technol., vol. 47, no. 6, pp. 647-661, 2015, doi: 10.1016/j.net.2015.06.009.

R. Span and W. Wagner, “A new equation of state for carbon dioxide covering the fluid region from the triple-point temperature to 1100K at pressures up to 800 MPa,” J. Phys. Chem. Ref. Data, vol. 25, pp. 1509-1596, 1996, doi:10.1063/1.555991.

F. Crespi, G. Gavagnin, D. Sánchez, and G.S. Martínez, “Supercritical carbon dioxide cycles for power generation: a review,” Appl. Energy, vol. 195, pp.152-158, 2017, doi: 10.1016/j.apenergy.2017.02.048.

M.T. Luu, D. Milani, R. McNaughton, and A. Abbas, “Analysis for flexible operation of supercritical CO2 Brayton cycle integrated with solar thermal systems,” Energy, vol. 124, pp. 752-771, 2017, doi: 10.1016/j.energy.2017.02.040.

V.T. Cheang, R.A. Hedderwick, and C. McGregor, “Benchmarking supercritical carbon dioxide cycles against steam Rankine cycles for concentrated solar power,” Sol. Energy, vol. 113, pp. 199-211, 2015, doi: 0.1016/j.solener.2014.12.016.

F.A. Al-Sulaiman and M. Atif, “Performance comparison of different supercritical carbon dioxide Brayton cycles integrated with a solar power tower,” Energy, vol. 82, pp. 61-71, 2015, doi: 10.1016/j.energy.2014.12.070.

D.V. Di Maio, A. Boccitto, and G. Caruso, “Supercritical carbon dioxide applications for energy conversion systems,” Energy Proc., vol. 82, pp. 819-824, 2015, doi: 10.1016/j.egypro.2015.11.818.

J.J. Dyreby, Modeling the Supercritical Carbon Dioxide Brayton Cycle with Recompression, PhD thesis, University of Wisconsin-Madison, 2014.

D. Novales, A. Erkoreka, V. De la Peña, and B. Herrazti, “Sensitivity analysis of supercritical CO2 power cycle energy and exergy efficiencies regarding cycle component efficiencies for concentrating solar power,” Energy Convers. Manage., vol. 182, pp. 430-450, 2019, doi: 10.1016/j.enconman.2018.12.016.

M. Saeed, S. Khatoon, and M.H. Kim, “Design optimization and performance analysis of a supercritical carbon dioxide recompression Brayton cycle based on the detailed models of the cycle components,” Energy Convers. Manage., vol. 196, pp. 242-260, 2019, doi: 10.1016/j.enconman.2019.05.110.

M.A. Reyes-Belmonte, A. Sebastián, M. Romero, and J. González-Aguilar, “Optimization of a recompression supercritical carbon dioxide cycle for an innovative central receiver solar power plant,” Energy, vol. 112, pp. 17-27, 2016, doi: 10.1016/j.energy.2016.06.013.

K. Wang and Y.L. He, “Thermodynamic analysis and optimization of a molten salt solar power tower integrated with a recompression supercritical CO2 Brayton cycle based on integrated modeling,” Energy Convers. Manage., vol. 135, pp. 336-350, 2017, doi: 10.1016/j.enconman.2016.12.085.

J. Sarkar and S. Bhattacharyya, “Optimization of recompression S-CO2 power cycle with reheating,” Energy Convers. Manage., vol. 50, no. 8, pp. 1939-1945, 2009, doi: 10.1016/j.enconman.2009.04.015.

Y. Ma, M. Liu, J. Yan, and J. Lui, “Thermodynamic study of main compression intercooling effects on supercritical CO2 recompression Brayton cycle,” Energy, vol. 140, pp. 746-756, 2017, doi: 10.1016/j.energy.2017.08.027.

E. Ruiz-Casanova, C. Rubio-Maya, J.J. Pacheco-Ibarra, V.M. Ambriz-Díaz, C.E. Romero, and X. Wang, “Thermodynamic analysis and optimization of supercritical carbon dioxide Brayton cycles for use with low-grade geothermal heat sources,” Energy Convers. Manage., vol. 216, pp. 112978, 2020, doi: 10.1016/j.enconman.2020.112978.

J. Yang, Z. Yang, and Y. Duan, “Part-load performance analysis and comparison of supercritical CO2 Brayton cycles,” Energy Convers. Manage., vol. 214, pp. 112832, 2020, doi: 10.1016/j.enconman.2020.112832.

K. Wang, Y.L. He, and H.H. Zhu, “Integration between supercritical CO2 Brayton cycles and molten salt solar power towers: a review and a comprehensive comparison of different cycle layouts,” Appl. Energy, vol. 195, pp. 819-836, 2017, doi: 10.1016/j.apenergy.2017.03.099.

X. Wang, Q. Liu, J. Lei, W. Han, and H. Jin, “Investigation of thermodynamic performances for two-stage recompression supercritical CO2 Brayton cycle with high temperature thermal energy storage system,” Energy Convers. Manage., vol. 165, pp. 477-487, 2018, doi: 10.1016/j.enconman.2018.03.068.

Z. Rao, T. Xue, K. Huang, and S. Liao, “Multi-objective optimization of supercritical carbon dioxide recompression Brayton cycle considering printed circuit recuperator design,” Energy Convers. Manage., vol. 201, pp. 112094, 2019, doi: 10.1016/j.enconman.2019.112094.

N.D. Baltadjiev, C. Lettieri, and Z.S. Spakovszky, “An investigation of real gas effects in supercritical CO2 centrifugal compressors,” J. Turbomach., vol. 137, no. 9, pp. 091003, 2015, doi: 10.1115/1.4029616.

B. Halimi and K.Y. Suh, “Computational analysis of supercritical CO2 Brayton cycle power conversion system for fusion reactor,” Energy Convers. Manage., vol. 63, pp. 38-43, 2012, doi: 10.1016/j.enconman.2012.01.028.

Thermophysical Properties of Fluid Systems, National Institute of Standards and Technology, 2018. [Online]. Available: https://webbook.nist.gov/chemistry/fluid/

A. Moisseytsev and J.J. Sienicki, Development of a Plant Dynamics Computer Code for Analysis of a Supercritical Carbon Dioxide Brayton Cycle Energy Converter Coupled to a Natural Circulation Lead-Cooled Fast Reactor, Report, US: Argonne National Laboratory, 2006.