Overlap energy utilization reaches maximum efficiency for S-CO2 coal fired power plant: A new principle

Abstract For a coal fired power plant, a combined supercritical CO2 cycle (S-CO2) absorbs flue gas energy over entire temperature range. Because top/bottom cycles absorb high and moderate temperature flue gas energy respectively, there is an efficiency gap between the two cycles. To fill the efficiency gap, the overlap absorption of flue gas energy is proposed, using top cycle to absorb high temperature flue gas heat, but bottom cycle to absorb not only moderate temperature flue gas heat, but also a part of high temperature flue gas heat. The overlap energy absorption in a high temperature regime increases CO2 heat absorption temperature to improve bottom cycle efficiency. A four steps roadmap guides us to construct a combined cycle with RC + DRH as top cycle and RC + DRH + EAP as bottom cycle to reach the maximum efficiency limit, where RC, DRH and EAP represent the cycles of recompression, double-reheating and external air preheater, respectively. The components sharing among top/bottom cycles ensures simple system layout, and EAP recycles extra heat of bottom cycle to the system, keeping a smallest heat dissipation to environment. The net power efficiency reaches 47.99% at the main vapor parameters of 620 °C/30 MPa. The overlap energy utilization can be extended for other systems.

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

[2]  S. C. Kaushik,et al.  Exergetic analysis and performance evaluation of parabolic trough concentrating solar thermal power plant (PTCSTPP) , 2012 .

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

[4]  A. L. Shvarts,et al.  Review of the coal-fired, over-supercritical and ultra-supercritical steam power plants , 2017 .

[5]  J. I. Linares,et al.  Recuperated versus single-recuperator re-compressed supercritical CO2 Brayton power cycles for DEMO fusion reactor based on dual coolant lithium lead blanket , 2017 .

[6]  Sung Ho Park,et al.  Thermodynamic and economic investigation of coal-fired power plant combined with various supercritical CO2 Brayton power cycle , 2018 .

[7]  Peter A. Jacobs,et al.  Dynamic characteristics of a direct-heated supercritical carbon-dioxide Brayton cycle in a solar thermal power plant , 2013 .

[8]  The Early Days of the Power Station Industry , 1939 .

[9]  Hongguang Jin,et al.  Reactivity study on a novel hydrogen fueled chemical-looping combustion , 2001 .

[10]  Dawid P. Hanak,et al.  Calcium looping with supercritical CO2 cycle for decarbonisation of coal-fired power plant , 2016 .

[11]  Wenyi Liu,et al.  Thermodynamic performance simulation and concise formulas for triple-pressure reheat HRSG of gas–steam combined cycle under off-design condition , 2016 .

[12]  Hongqi Wei,et al.  A novel cascade energy utilization to improve efficiency of double reheat cycle , 2018, Energy Conversion and Management.

[13]  Kun Wang,et al.  Thermodynamic analysis and optimization of a molten salt solar power tower integrated with a recompression supercritical CO2 Brayton cycle based on integrated modeling , 2017 .

[14]  Yongping Yang,et al.  A novel solar energy integrated low-rank coal fired power generation using coal pre-drying and an absorption heat pump , 2017 .

[15]  Ibrahim Dincer,et al.  Development and assessment of a novel integrated nuclear plant for electricity and hydrogen production , 2017 .

[16]  Mustafa Music,et al.  Conceptualizing sustainable development of conventional power systems in developing countries – A contribution towards low carbon future , 2017 .

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

[18]  G. Yue,et al.  The oxidation behaviour of an austenitic steel in deaerated supercritical water at 600–700 °C , 2017 .

[19]  Ö. Doğan,et al.  Oxidation of alloys for energy applications in supercritical CO2 and H2O , 2016 .

[20]  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.

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

[22]  Damien Féron,et al.  Overview on corrosion in supercritical fluids , 2017 .

[23]  Ningning Si,et al.  Exergy analysis of a 1000 MW double reheat ultra-supercritical power plant , 2017 .

[24]  A. Bejan.  Advanced Engineering Thermodynamics , 1988 .

[25]  Hongguang Jin,et al.  Investigation of thermodynamic performances for two-stage recompression supercritical CO2 Brayton cycle with high temperature thermal energy storage system , 2018, Energy Conversion and Management.

[26]  A. Moisseytsev,et al.  Investigation of alternative layouts for the supercritical carbon dioxide Brayton cycle for a sodium-cooled fast reactor. , 2009 .

[27]  Defu Che,et al.  Thermal deformation prediction based on the temperature distribution of the rotor in rotary air-preheater , 2015 .

[28]  G. Notton,et al.  Intermittent and stochastic character of renewable energy sources: Consequences, cost of intermittence and benefit of forecasting , 2018 .

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

[30]  Seungjoon Baik,et al.  Study on CO2 – water printed circuit heat exchanger performance operating under various CO₂ phases for S-CO₂ power cycle application , 2017 .

[31]  Jiming Hao,et al.  Primary air pollutant emissions of coal-fired power plants in China: Current status and future prediction , 2008 .

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