Study On The Optimization Design Of Integrated Solar Combined Cycle System

The integrated-solar energy gas steam combined cycle(ISCC)system has a series of advantages such as increasing the system power generation,less pollutant and CO2 emission,reducing the solar power generation cost and improving the solar photoelectric efficiency.This paper uses Aspen Plus software to build up the model for gas steam combined cycle power plant PG9351 and uses Ebsilon Professional commercial software to establish DSG solar trough solar collector mirror field respectively in increasing power type mode of operation.To explore the complementary integrated mechanism,the solar trough and the waste heat boiler were studied by the possible integration schemes of HRSG with solar trough are studied in this paper..The maximum solar energy and solar energy conversion efficiency are used to guide the integration schemes of HRSG with solar trough,the optimal integration scheme for the replacement of HPB、HPB+LPE、HPE2+HPB+SHl、HPE1+HPE2+HPB+SH1 heating surface.By using energy analysis and exergy analysis to compare with the above four kinds of integration schemes,The ISCC-DSG system with the replacement of HPB heating surface achieves maximum power conversion efficiency and photoelectric conversion efficiency and solar exergy efficiency,which are 47.87%and 30.4%.The ISCC-DSG system with the replacement of HPB+LPE heating surfaces achieve the maximum solar energy power and the maximum solar exergy efficiency,which are 33.61%.The research above can provide reference for the actual engineering operation.According to small share of the solar power generation and a large solar filed may cause loss of solar energy resource,a new integration scheme of using solar trough to replace both low pressure economizer and high pressure evaporator is peospered in this paper,when the trough mirror f6eld area is 105000m2.The generation efficiency of the solar in prospered system is higher than the system using solar to replace the high pressure evaporator(HPB)by 12.61 MW and 21.81%.Annual performance of the prospered system is obtained,which will provide the useful reference for the construction of ISCC power station in China.