Abstract
The objective of this paper is to provide the optimal choice of single-reheating or double-reheating when considering residual flue gas heat in S-CO2 coal fired power system. The cascade utilization of flue gas energy includes three temperature levels, with high and low temperature ranges of flue gas heat extracted by S-CO2 cycle and air preheater, respectively. Two methods are proposed to absorb residual flue gas heat Qre in middle temperature range. Both methods shall decrease CO2 temperature entering the boiler T4 and increase secondary air temperature Tsec air, whose maximum value is deduced based on energy conservation in air preheater. The system is analyzed incorporating thermodynamics, boiler pressure drop and energy distribution. It is shown that at a given main vapor temperature T5, the main vapor pressure P5 can be adjusted to a value so that Qre is completely eliminated, which is called the main vapor pressure adjustment method. For this method, single-reheating is only available for higher main vapor temperatures. The power generation efficiency for single-reheating is obviously higher than double-reheating. If residual flue gas heat does exist, a flue gas heater FGC is integrated with S-CO2 cycle, which is called the FGC method. Both single-reheating and double-reheating share similar power generation efficiency, but single-reheating creates less residual flue gas heat. We conclude that single-reheating is preferable, and the pressure adjustment method achieves obviously higher power generation efficiency than the FGC method.
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References
Moisseytsev A., Sienicki J.J., Investigation of alternative layouts for the supercritical carbon dioxide Brayton cycle for a sodium–cooled fast reactor. Nuclear Engineering and Design, 2009, 239(7): 1362–1371.
Ahn Y., Lee J.I., Study of various Brayton cycle designs for small modular sodium–cooled fast reactor. Nuclear Engineering and Design, 2014, 276: 128–141.
Jeong W.S., Lee J.I., Jeong Y.H., Potential improvements of supercritical recompression CO2Brayton cycle by mixing other gases for power conversion system of a SFR. Nuclear Engineering and Design, 2011, 241(6): 2128–2137.
Li M., Zhu H., Guo J., Wang K., Tao W., The development technology and applications of supercritical CO2 power cycle in nuclear energy, solar energy and other energy industries. Applied Thermal Engineering, 2017, 126: 255–275.
Wang K., He Y., Thermodynamic analysis and optimization of a molten salt solar power tower integrated with a recompression supercritical CO2 Brayton cycle based on integrated modeling. Energy Conversion and Management, 2017, 135: 336–350.
Wang X., Liu Q., Lei J., Han W., Jin H., Investigation of thermodynamic performances for two–stage recompression supercritical CO2 Brayton cycle with high temperature thermal energy storage system. Energy Conversion and Management, 2018, 165: 477–487.
Kim M.S., Ahn Y., Kim B., Lee J.I., Study on the supercritical CO2 power cycles for landfill gas firing gas turbine bottoming cycle. Energy, 2016, 111: 893–909.
Kim Y.M., Sohn J.L., Yoon E.S., Supercritical CO2 Rankine cycles for waste heat recovery from gas turbine. Energy, 2017, 118: 893–905.
Hou S., Wu Y., Zhou Y., Yu L., Performance analysis of the combined supercritical CO2 recompression and regenerative cycle used in waste heat recovery of marine gas turbine. Energy Conversion and Management, 2017, 151: 73–85.
Angelino G., Carbon dioxide condensation cycles for power production. Journal of Engineering for Power, 1968, 90(3): 287–295.
Dostal V., A supercritical carbon dioxide cycle for next generation nuclear reactors. Nuclear Engineering, Massachusetts Institute of Technology, Cambridge, USA, 2004.
Holcomb G.R., Carney C., Doğan Ö.N., Oxidation of alloys for energy applications in supercritical CO2 and H2O. Corrosion Science, 2016, 109: 22–35.
Zhong D.W., Meng J.A., Qin P., et al., Effect of cooling water flow path on the flow and heat transfer in a 660MW power plant condenser. Journal of Thermal Science, 2019, 28(2): 262–270.
International Energy Agency (IEA). Key world energy statistics 2017, 2017.
BP statistical review of world energy June 2017. https://www.bp.com/en/global/corporate/energy–economi cs/statistical–review–of–world–energy.html, 2017.
Gonzalez–Salazar M.A., Kirsten T., Prchlik L., Review of the operational flexibility and emissions of gas–and coal–fired power plants in a future with growing renewables. Renewable and Sustainable Energy Reviews, 2018, 82: 1497–1513.
Xu J., Sun E., Li M., Liu H., Zhu B., Key issues and solution strategies for supercritical carbon dioxide coal fired power plant. Energy, 2018, 157: 227–246.
Sun E., Xu J., Li M., Liu G., Zhu B., Connected–topbottom–cycle to cascade utilize flue gas heat for supercritical carbon dioxide coal fired power plant. Energy Conversion and Management, 2018, 172: 138–154.
Hanak D.P., Manovic V., Calcium looping with supercritical CO2 cycle for decarbonisation of coal–fired power plant. Energy, 2016, 102: 343–353.
Zhou J., Zhang C., Su S., Wang Y., Hu S., Liu L., et al., Exergy analysis of a 1000MW single reheat supercritical CO2 Brayton cycle coal–fired power plant. Energy Conversion and Management, 2018, 173: 348–358.
Chen S., Soomro A., Yu R., Hu J., Sun Z., Xiang W., Integration of chemical looping combustion and supercritical CO2 cycle for combined heat and power generation with CO2 capture. Energy Conversion and Management, 2018, 167: 113–124.
Le Moullec Y., Conceptual study of a high efficiency coal–fired power plant with CO2 capture using a supercritical CO2 Brayton cycle. Energy, 2013, 49: 32–46.
Mecheri M., Le Moullec Y., Supercritical CO2 Brayton cycles for coal–fired power plants. Energy, 2016, 103: 758–771.
Park S., Kim J., Yoon M., Rhim D., Yeom C., Thermodynamic and economic investigation of coal–fired power plant combined with various supercritical CO2 Brayton power cycle. Applied Thermal Engineering, 2018, 130: 611–623.
Lemmon E.W., Huber M.L., Mc Linden M.O., NIST standard reference database 23: reference fluid thermodynamic and transport properties–REFPROP, version 9.1. Tech. rep., National Institute of Standards and Technology, Standard Reference Data Program, Gaithersburg, 2013.
Liu Z., He Y., Yang Y., Fei J., Experimental study on heat transfer and pressure drop of supercritical CO2 cooled in a large tube. Applied Thermal Engineering, 2014, 70(1): 307–315.
Basu P., Kefa C., Jestin L., Boilers and burners: design and theory. Springer Science & Business Media, New York, 2012.
Chen H., Pan P., Shao H., Wang Y., Zhao Q., Corrosion and viscous ash deposition of a rotary air preheater in a coal–fired power plant. Applied Thermal Engineering, 2017, 113: 373–385.
Wang L., Deng L., Tang C., et al., Thermal deformation prediction based on the temperature distribution of the rotor in rotary air–preheater. Applied Thermal Engineering, 2015, 90: 478–488.
Zhao L., Zhou Q., Boiler course design. China Electric Power Press, Beijing, 2013 (in Chinese).
Acknowledgements
This paper is supported by the National Key R&D Program of China (2017YFB0601801), the Science Fund for Creative Research Groups of the National Natural Science Foundation of China (51821004), the Fundamental Research Funds for the Central Universities (2018ZD02 and 2018QN042).
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Sun, E., Xu, J., Hu, H. et al. Single-Reheating or Double-Reheating, Which is Better for S-CO2 Coal Fired Power Generation System?. J. Therm. Sci. 28, 431–441 (2019). https://doi.org/10.1007/s11630-019-1130-8
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DOI: https://doi.org/10.1007/s11630-019-1130-8