Research On System Integration Of Parabolic Trough Solar Thermal Power Plants

In this thesis, the thermodynamic performance of Parabolic Trough Collectors is studied by experiment and simulation, and the indirect steam generation system and dual-solar field parabolic trough solar thermal power plant is investigated.A comprehensive model of parabolic trough collectors which is based on the energy conversion process is developed to predict overall system performance. Firstly, the simulation results have a good match with the experimental data from literature published by Sandia Laboratory. The author participates in building the 30m2 parabolic trough collector system experimental devices, and experimental study to evaluate the collector performance is conducted. This model is also verified by the experimental data. The research results show that this model can be used to predict and evaluate the performance of parabolic trough collector systems.Based on the experimental devices located in Langfang of the parabolic trough solar collector steam generation system, the thermodynamic performance of parabolic trough collectors is investigated. The effects of Direct Normal Irradiation (DNI) and Heat Transfer Fluid (HTF) flow rate are analyzed. Parabolic trough solar steam generation system is simulated and the energy conversion process is revealed with the aid of Energy Utilization Diagram (EUD) methodology, the results showed that the exergy destruction mainly took place in the process of optical concentration and optic-thermal conversion process. Finally the method how to integrate this system to existing urban heating system is analyzed briefly.Dual-solar field parabolic trough solar thermal power plants are proposed, and several cases of these systems are shown. The thermal and economic performance is analyzed, and the research results show that the case of dual-solar field parabolic trough power system coupled with high temperature solar field using oil as HTF and low temperature solar field using molten salt as HTF has the benefit in terms of system efficiency and economic performance. This method provides a new approach to improve the performance of solar thermal power plants.