Design assessment of a 5 MW fossil-fired supercritical CO2 power cycle pilot loop

Abstract The concept of the supercritical CO2 (S-CO2) power cycle has been widely proved to be effective by several small scale test loops. However, more specific system layout for fossil-fired power generation and key components design assessment is still imperative to demonstrate the technology feasibility of commercial scale utility. The S-CO2 power cycle must be optimized to deal with fossil-fired system integration constraints. In the present study the technology adaption of S-CO2 power cycle for fossil-fired power plant has been evaluated in terms of both the whole thermodynamic cycle layout and the preliminary assessment of key components. The design considerations and selections of key parameters such as turbine inlet parameters, compressor inlet parameters and split flow ratios were analyzed by a self-developed code for the purpose of optimization design of a 5 MW fossil-based S-CO2 pilot test loop. The proposed recompression and reheat cycle with two split ratios tailored for fossil-fired power plants can achieve 33.49% net efficiency. As a first step to the final recompression cycle, the design of simple recuperated and reheat cycle after carefully considerations of the specific design assessment of core components such as boiler, turbines, compressor and compact heat exchangers has been accomplished and currently under construction.

[1]  C. Turchi,et al.  Thermodynamic Study of Advanced Supercritical Carbon Dioxide Power Cycles for Concentrating Solar Power Systems , 2013 .

[2]  Brian D. Iverson,et al.  Supercritical CO2 Brayton cycles for solar-thermal energy , 2013 .

[3]  Jahar Sarkar,et al.  Second law analysis of supercritical CO2 recompression Brayton cycle , 2009 .

[4]  Yann Le Moullec,et al.  Conceptual study of a high efficiency coal-fired power plant with CO2 capture using a supercritical CO2 Brayton cycle , 2013 .

[5]  Jian Xie,et al.  Supercritical “boiling” number, a new parameter to distinguish two regimes of carbon dioxide heat transfer in tubes , 2019, International Journal of Thermal Sciences.

[6]  A. Moisseytsev,et al.  A numerical investigation of the sCO2 recompression cycle off-design behaviour, coupled to a sodium cooled fast reactor, for seasonal variation in the heat sink temperature , 2013 .

[7]  Yu Yang,et al.  300 MW boiler design study for coal-fired supercritical CO2 Brayton cycle , 2018 .

[8]  Christopher P. Sprague,et al.  Startup and Operation of a Supercritical Carbon Dioxide Brayton Cycle , 2013 .

[9]  Jae Eun Cha Operation Results of a Closed Supercritical CO 2 Simple Brayton Cycle , 2016 .

[10]  Kun Wang,et al.  The development technology and applications of supercritical CO2 power cycle in nuclear energy, solar energy and other energy industries , 2017 .

[11]  Seungjoon Baik,et al.  Review of supercritical CO2 power cycle technology and current status of research and development , 2015 .

[12]  Zhang Yifan,et al.  Coupled simulation of the combustion and fluid heating of a 300 MW supercritical CO2 boiler , 2017 .

[13]  Thomas M. Conboy,et al.  Control of a Supercritical CO2 Recompression Brayton Cycle Demonstration Loop , 2013 .

[14]  Mingyu Yao,et al.  Parameter and layout optimization of a high temperature solar combined cycle using low temperature thermal storage , 2017 .

[15]  E. Feher SUPERCRITICAL THERMODYNAMIC POWER CYCLE. , 1967 .

[16]  John J. Dyreby,et al.  Design Considerations for Supercritical Carbon Dioxide Brayton Cycles With Recompression , 2014 .

[17]  Vaclav Dostal,et al.  A supercritical carbon dioxide cycle for next generation nuclear reactors , 2004 .

[18]  G. Angelino Carbon Dioxide Condensation Cycles For Power Production , 1968 .

[19]  David Sánchez,et al.  Supercritical carbon dioxide cycles for power generation: A review , 2017 .

[20]  Jeong-Ik Lee,et al.  Preliminary studies of compact Brayton cycle performance for Small Modular High Temperature Gas-cooled Reactor system , 2015 .

[21]  Zhang Yifan,et al.  An improved modeling on convection heat transfer of supercritical fluids for several advanced energy systems , 2017 .

[22]  Jinliang Xu,et al.  Key issues and solution strategies for supercritical carbon dioxide coal fired power plant , 2018, Energy.

[23]  Gary E Rochau,et al.  Supercritical CO2 recompression Brayton cycle : completed assembly description. , 2012 .

[24]  Yueming Wang,et al.  Improved design of supercritical CO2 Brayton cycle for coal-fired power plant , 2018, Energy.

[25]  Marco Astolfi,et al.  Preliminary Assessment of sCO2 Power Cycles for Application to CSP Solar Tower Plants , 2017 .

[26]  Yann Le Moullec,et al.  Supercritical CO2 Brayton cycles for coal-fired power plants , 2016 .

[27]  M. McKellar,et al.  Optimization and Comparison of Direct and Indirect Supercritical Carbon Dioxide Power Plant Cycles for Nuclear Applications , 2011 .

[28]  Zhang Yifan,et al.  PDF-based modeling on the turbulent convection heat transfer of supercritical CO2 in the printed circuit heat exchangers for the supercritical CO2 Brayton cycle , 2016 .

[29]  Jinliang Xu,et al.  Connected-top-bottom-cycle to cascade utilize flue gas heat for supercritical carbon dioxide coal fired power plant , 2018, Energy Conversion and Management.