Study on the Integration Schemes and Performance Comparisons of Different Integrated Solar Combined Cycle-Direct Steam Generation Systems
The integrated solar combined cycle (ISCC) system has a series of advantages such as increasing the system power generation, reducing the cost of solar power generation, less pollutant and CO2 emission. In this paper, the parabolic trough collectors with direct steam generation (DSG) technology are considered to replace the heat load of heating surfaces in heat regenerator steam generation (HRSG) of a conventional natural gas combined cycle (NGCC) system containing a PG9351FA gas turbine and a triple pressure HRSG with reheat. The detailed model of the NGCC system is built in ASPEN PLUS software and the parabolic trough collectors with DSG technology is modeled in EBSILON software. ISCC-DSG systems with the replacement of single, two, three and four heating surfaces are studied in this paper. Results show that: (1) the ISCC-DSG systems with the replacement heat load of HPB, HPB+LPE, HPE2+HPB+HPS, HPE1+HPE2+ HPB+HPS are the best integration schemes when single, two, three and four stages of heating surfaces are partly replaced by the parabolic trough solar energy collectors with DSG technology. (2) Both the changes of feed water flow and the heat load of the heating surfaces in ISCC-DSG systems with the replacement of multi-stage heating surfaces are smaller than those in ISCC-DSG systems with the replacement of single heating surface. (3) ISCC-DSG systems with the replacement of HPB+LPE heating surfaces can increase the solar power output significantly. (4) The ISCC-DSG systems with the replacement of HPB heating surfaces has the highest solar-thermal-to-electricity efficiency (47.45%) and the solar radiation energy-to-electricity efficiency (30.37%), as well as the highest exergy efficiency of solar field (33.61%).
 A Baghernejad, M Yaghoubi, Exergy analysis of an integrated solar combined cycle system (J). Renewable Energy, 2010; 35:2157-2164.
 Giovanni Manente. High performance integrated solar combined cycles with minimum modifications to the combined cycle power plant design. Energy Conversion and Management, 111 (2016) 186–197.
 Giovanni manente. Optimum choice and placement of concentrating solar power technologies in integrated solar combined cycle systems. Renewable Energy, 96 (2016) 172-189.
 Mario Amelio. An evaluation of the performance of an integrated solar combined cycle plant provided with air-linear parabolic collectors. Energy, 69 (2014) 742-748.
 Lin Ruomou, Jin Hongguang. Integrated solar combined cycle power generation system. Gas Turbine Technology 2013;26(2):1-15.
 Allani Y.CO2 mitigation through the use of hybrid solar-combined cycles. Energy convers Manag., 1997;38:661–7.
 Kane M, Favrat D. Approche de conception et d’optimisation de centrale, solaire intégrée à cycle, combiné inspirée de la méthode du, pincement (partie 1: paliers de, récupération). (J). International Journal of Thermal Sciences, 1999, 59(1):9-16.
 Khaldi F. Energy and exergy analysis of the first hybrid solar-gas power plant in Algeria (C)// Ecos. 2012.
 Bakos GC,ParsaD.Technoeconomic assessment of an integrated solar combined cycle power plant in Greece using line-focus parabolic trough collectors. RenewEnergy 2013;60:598–603.
 Antoñanzas-TorresFernando, Sodupe-Ortega Enrique. Technical feasibility assessment of integrated solar combined cycle power plants in Ciudad Real (Spain) and Las Vegas (USA). In: Proceedings of the XVI congreso internacional de ingeniería de proyectos.Valencia;11–13deJulio de 2012.p.1282–891.
 Reddy V S, Kaushik S C, Tyagi S K. Exergetic analysis of solar concentrator aided coal fired super critical thermal power plant (SACSCTPT) (J). Clean Technologies and Environmental Policy, 2013, 15(1):133-145.
 Cau Giorgio, Cocco Daniele, Tola Vittorio. Performance and cost assessment of integrated solar combined cycle systems(ISCCSs) using CO2 as heat transfer fluid. Solar Energy,2012;86:2975–85.
 Feldhoff JanFabian. Direct steam generation(DSG) – technology overview. SFERA summer school, Almerá(Spain);28June2012.
 Mohamed AHEl-sayed. Solar supported steam production for power generation in Egypt. Energy Policy,2005;33:1251–9.
 Livshits Maya, Kribus Abraham. Solar hybrid steam injection gas turbine (STIG) cycle. Sol Energy 2012;86:190–9.
 Yuanyuan Li, Yongping Yang. Thermodynamic analysis of a novel integrated solar combined cycle (J). Applied Energy, 2014, 122:133-142.
 Nezammahalleh H, Farhadi F, Tanhaemami M. Conceptual design and techno-economic assessment of integrated solar combined cycle system with DSG technology (J). Solar Energy, 2010, 84(9):1696-1705.
 B. Kelly, U. Herrmann, M.J. Hale, Optimization studies for integrated solar combined cycle systems, in: Proceedings of Solar Forum 2001, Solar Energy: The Power to Choose, 2001. Apr 21e25; Washington DC, USA.