Performance Optimization Of Solar Aided Coal-Fired Power Generation System Based On The Exergy Analysis

Solar aided coal-fired power generation system (SACFPGS) can realize the coupling of solar energy and the traditional thermal power generation, which will reduce coal consumption of traditional thermal power process and promote energy-saving emission reduction of power generation process. The characteristic of energy distribution and the optimization method of the parabolic trough solar aided coal-fired power generating system has been explored in this thesis. The main research contents and results are as follows:Firstly, the basic model of the SACFPGS is set up according to the operation characteristics of the parabolic trough solar field and the working conditons of a300MW coal-fired power plant. The verification of this model will determine its accuracy and will be the a basis of further study.Secondly, on the basis of the second law of thermodynamics, this thesis gets the energy distribution and utilization of this system through analysising the exergy characteristics of the SACFPGS working in different operation loads. Through the comparison of the coal-fired power system and the SACFPGS, it can get the advantages of the SACFPGS in energy utilization.Moreover, this thesis studies the SACFPGS with the unavoidable exergy analysis on the foundation of the conventional exergy analysis. According to the exergy utilization conditions and the characteristics of the devices of SACFPGS, it analysis the development and utilization parts in the exergy loss of these devices for the optimization and transformation of the SACFPGS.Lastly, the economic performance of the SACFPGS is studied in this paper. Combine the economic analysis with the unavoidable exergy analysis of the SACFPGS we can get the unavoidable costs of the system and the optimization priority of the devices in SACFPGS, which will be the foundation of the investment in this kind of the system.