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System Analysis on Supercritical CO2 Power Cycle with Circulating Fluidized Bed Oxy-Coal Combustion

  • Yan Shi
  • Wenqi ZhongEmail author
  • Yingjuan Shao
  • Jun Xiang
Article
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Abstract

Supercritical carbon dioxide (S-CO2) Brayton power cycle is a competitive technology to achieve high efficiency in a variety of applications. However, in coal power applications, the CO2 generated from coal combustion still discharges into the atmosphere causing a series of environment problems. In this work, an 300 MWe S-CO2 power cycle with circulating fluidized bed (CFB) oxy-coal combustion was established including air separation unit (ASU), CFB boiler, recuperator system and carbon dioxide compression and purification unit (CPU). Based on the material and energy conservation, the cycle efficiency of S-CO2 (620°C, 25 MPa) Brayton power cycle with CFB oxy-coal combustion is evaluated compared to the oxy-coal combustion steam Rankine cycle and S-CO2 Brayton power cycle with the 31.65 kg/s coal supply. After that, the influence of several factors, e.g., exhaust flue gas temperature, split ratio in recuperator system and the oxygen supply on the cycle efficiency was investigated and analyzed. The results show that the net efficiency of S-CO2 power cycle with CFB oxy-coal combustion (32.67%) is much higher than the steam Rankine cycle utilizing CFB with 17.5 Mpa, 540°C steam (27.3%), and 25 Mpa, 620°C steam (30.15%) under the same exhaust flue gas temperature. In addition, lower exhaust flue gas temperature and higher split ratio are preferred to achieve higher cycle efficiency. Lower oxygen supply can reduce the energy consumption of ASU and CPU, further increasing the system net efficiency. However, the energy losses of ASU and CPU are still very large in oxy-coal combustion and need to be improved in further work.

Keywords

S-CO2 oxy-coal combustion CO2 capture CFB boiler process simulation 

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Notes

Acknowledgments

This work was supported by the National key research and development program of China (project number: 2017YFB0601802), the project of the National Natural Science Foundation of China (project number: 51876037) and the Key Research and Development Program of Jiangsu Province, China (No. BE2017159).

References

  1. [1]
    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.CrossRefGoogle Scholar
  2. [2]
    Ahn Y., Bae S.J., Kim M., et al., Review of supercritical CO2 power cycle technology and current status of research and development. Nuclear Engineering and Technology, 2015, 47(6): 647–661.CrossRefGoogle Scholar
  3. [3]
    Sulzer G., Verfahren zur erzeugung von arbeit aus warme (Method for producing work from heat). Swiss Patent 269599, 1948.Google Scholar
  4. [4]
    Feher E.G., The supercritical thermodynamic power cycle. Energy Conversion, 1968, 8(2): 85–90.CrossRefGoogle Scholar
  5. [5]
    Angelino G., Carbon dioxide condensation cycles for power production. Journal of Engineering for Power 1968, 90(3): 287–295.Google Scholar
  6. [6]
    Dostál V., Driscoll M.J., Hejzlar P., A Supercritical carbon dioxide cycle for next generation nuclear reactors. Massachusetts Institute of Technology, 2004.Google Scholar
  7. [7]
    Neises T., Turchi C., A comparison of supercritical carbon dioxide power cycle configurations with an emphasis on CSP applications. Energy Procedia, 2014, 49: 1187–1196.CrossRefGoogle Scholar
  8. [8]
    Padilla R.V., Benito R.G., Stein W., An exergy analysis of recompression supercritical CO2 cycles with and without reheating. Energy Procedia, 2015, 69: 1181–1191.CrossRefGoogle Scholar
  9. [9]
    Persichilli M., Held T., Hostler S., et al., Transforming waste heat to power through development of a CO2-based-power cycle. Electric Power Expo, 2011: 10–12.Google Scholar
  10. [10]
    Wright S., Davidson C., Scammell W., Thermo-economic analysis of four sCO2 waste heat recovery power systems//Fifth International SCO2 Symposium, San Antonio, TX, 2016, pp.: 28–31.Google Scholar
  11. [11]
    Sánchez D., Chacartegui R., Jiménez-Espadafor F., et al., A new concept for high temperature fuel cell hybrid systems using supercritical carbon dioxide. Journal of Fuel Cell Science and Technology, 2009, 6(2): 021306.CrossRefGoogle Scholar
  12. [12]
    Huang Y., Wang J., Zang J., Liu G., Research activities on supercritical carbon dioxide power conversion technology in China. In: ASME, editor. ASME turbo expo 2014: turbine technical conference and exposition, Dusseldorf. DOI:  https://doi.org/10.1115/GT2014-26049.
  13. [13]
    Jeong W.S., Lee J.I., Jeong Y.H., Potential improvements of supercritical recompression CO2 Brayton cycle by mixing other gases for power conversion system of a SFR. Nuclear Engineering and Design, 2011, 241(6): 2128–2137.CrossRefGoogle Scholar
  14. [14]
    Dostal V., Hejzlar P., Driscoll M.J., High-performance supercritical carbon dioxide cycle for next-generation nuclear reactors. Nuclear Technology, 2006, 154(3): 265–282.CrossRefGoogle Scholar
  15. [15]
    Mecheri M., Le Moullec Y., Supercritical CO2 Brayton cycles for coal-fired power plants. Energy, 2016, 103: 758–771.CrossRefGoogle Scholar
  16. [16]
    White C., Shelton W., Dennis R., An assessment of supercritical CO2 power cycles integrated with generic heat sources//The 4th International Symposium-Supercritical CO2 Power Cycles. 2014.Google Scholar
  17. [17]
    Dyreby J., Klein S., Nellis G., et al., Design considerations for supercritical carbon dioxide Brayton cycles with recompression. Journal of Engineering for Gas Turbines and Power, 2014, 136(10): 101701.CrossRefGoogle Scholar
  18. [18]
    Wang X., Wang J., Zhao P., et al., Thermodynamic comparison and optimization of supercritical CO2 Brayton cycles with a bottoming transcritical CO2 cycle. Journal of Energy Engineering, 2015, 142(3): 04015028.CrossRefGoogle Scholar
  19. [19]
    Wang X., Wu Y., Wang J., Dai Y., Xie D., Thermoeconomic analysis of a recompression supercritical CO2 cycle combined with a transcritical CO2 cycle. In: ASME turbo expo 2015: turbine technical conference and exposition. Montreal: American Society of Mechanical Engineers; 2015. DOI:  https://doi.org/10.1115/GT2015-42033.Google Scholar
  20. [20]
    Wang X., Dai Y., Exergoeconomic analysis of utilizing the transcritical CO2 cycle and the ORC for a recompression supercritical CO2 cycle waste heat recovery: A comparative study. Applied Energy, 2016, 170: 193–207.CrossRefGoogle Scholar
  21. [21]
    Kosowska-Golachowska M., Thermal analysis and kinetics of coal during oxy-fuel combustion. Journal of Thermal Science, 2017, 26(4): 355–361.ADSCrossRefGoogle Scholar
  22. [22]
    Lockwood T., Techno-economic analysis of PC versus CFB combustion technology. IEA Clean Coal Centre, Report CCC/226, London, UK, 2013.Google Scholar
  23. [23]
    Allam R.J., Fetvedt J.E., Forrest B.A., et al., The oxy-fuel, supercritical CO2 Allam Cycle: New cycle developments to produce even lower-cost electricity from fossil fuels without atmospheric emissions//ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014: V03BT36A016-V03BT36A016. DOI:  https://doi.org/10.1115/GT2014-26952.
  24. [24]
    Scaccabarozzi R., Gatti M., Martelli E., Thermodynamic analysis and numerical optimization of the NET Power oxy-combustion cycle. Applied Energy, 2016, 178: 505–526.CrossRefGoogle Scholar
  25. [25]
    McClung A., Brun K., Delimont J., Comparison of supercritical carbon dioxide cycles for oxy-combustion//ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015: V009T36A006-V009T36A006. DOI:  https://doi.org/10.1115/GT2015-42523.
  26. [26]
    Geng C., Shao Y., Zhong W., et al., Thermodynamic analysis of supercritical CO2 power cycle with fluidized bed coal combustion. Journal of Combustion, 2018, 2018. DOI:  https://doi.org/10.1155/2018/6963292.Google Scholar
  27. [27]
    Jia L., Tan Y., Anthony E.J., Emissions of SO2 and NOx during oxy-fuel CFB combustion tests in a mini-circulating fluidized bed combustion reactor. Energy & Fuels, 2009, 24(2): 910–915.CrossRefGoogle Scholar
  28. [28]
    Wall T., Liu Y., Bhattacharya S., A scoping study on Oxy-CFB technology as an alternative carbon capture option for Australian black and brown coals. ANLEC R&D, Monash University, 2012.Google Scholar
  29. [29]
    Shelton W.W., Weiland N., White C., et al., Oxy-coal-fired circulating fluid bed combustion with a commercial utility-size supercritical CO2 power cycle//The 5th International Symposium-Supercritical CO2 Power Cycles, San Antonio, TX. 2016.Google Scholar
  30. [30]
    Xu J., Sun E., Li M., et al., Key issues and solution strategies for supercritical carbon dioxide coal fired power plant. Energy, 2018, 157: 227–246.CrossRefGoogle Scholar
  31. [31]
    Xiong J., Zhao H., Chen M., et al., Simulation study of an 800 MWe oxy-combustion pulverized-coal-fired power plant. Energy & Fuels, 2011, 25(5): 2405–2415.CrossRefGoogle Scholar
  32. [32]
    Tsuo Y.P., Gidaspow D., Computation of flow patterns in circulating fluidized beds. AIChE Journal, 1990, 36(6): 885–896.CrossRefGoogle Scholar
  33. [33]
    Hong J., Field R., Gazzino M., et al., Operating pressure dependence of the pressurized oxy-fuel combustion power cycle. Energy, 2010, 35(12): 5391–5399.CrossRefGoogle Scholar
  34. [34]
    Zebian H., Gazzino M., Mitsos A., Multi-variable optimization of pressurized oxy-coal combustion. Energy, 2012, 38(1): 37–57.CrossRefGoogle Scholar
  35. [35]
    Mondal S., De S., CO2 based power cycle with multi-stage compression and intercooling for low temperature waste heat recovery. Energy, 2015, 90: 1132–1143.CrossRefGoogle Scholar
  36. [36]
    Hong J., Chaudhry G., Brisson J.G., et al., Analysis of oxy-fuel combustion power cycle utilizing a pressurized coal combustor. Energy, 2009, 34(9): 1332–1340.CrossRefGoogle Scholar

Copyright information

© Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yan Shi
    • 1
  • Wenqi Zhong
    • 1
    Email author
  • Yingjuan Shao
    • 1
  • Jun Xiang
    • 2
  1. 1.Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and EnvironmentSoutheast UniversityNanjingChina
  2. 2.State Key Laboratory of Coal Combustion, School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhanChina

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