Research On Simulation Of Trough Solar Thermal Power Generation System

China’s solar energy resources are abundant,and vigorously developing solar thermal power generation is an energy strategy in line with China’s national conditions.The trough solar thermal power generation system has been put into commercial application,and the simulation of the system and the improvement of the efficiency of the collector are currently in full swing.Most of the existing researches have been carried out on individual collectors for experimental or simulation calculations or for single collector systems.For the simulation analysis of multiple collectors in actual power plant operation and for the entire thermal generation.There are few studies on system modeling analysis.In this paper,the modeling and simulation research of the trough solar thermal power generation system is carried out.The dual-circuit trough thermal power generation system is selected as the research object.The auxiliary energy system is not included in the system.The heat transfer medium in the heat collecting field uses heat transfer oil and the heat storage system.Indirect heat storage using molten salt.The optical model of the collector can be used to effectively calculate the hourly optical efficiency.The LS-2 collector is calculated 24 hours a day,and the comparison between the calculation result and the SAM software is small,which proves that the model has certain feasibility.The two-dimensional heat balance equation of the collector tube is established.Through the study of the basic heat transfer process of the collector tube,the calculation model of the heat loss of the collector tube is given,and the model is compared with the experimental data of the Schott RTR70 2008 collector tube.The model has certain precision degree;the calculation model of trough solar collector field layout and the relevant parameter calculation model of regenerative system are given;the typical operation model of power station is studied,and the calculation model of the annual power generation and other parameters is given and utilized.The program assembles the built models into visual simulation software.The simulation of 50 MW trough solar thermal power generation system in Zhangjiakou is carried out for 8760 hours in a year.The simulation parameters are compared with the SAM software to verify the accuracy of the software.The solar multiples and heat storage of the design parameters of the power station are optimized with low LCOE as the optimization target.Time length configuration is optimized;with the consideration of static investment scale and actual engineering existing technology,the smaller investment growth rate is exchanged for larger LCOE reduction as the optimization basis,and the solar multiple and heat storage duration are optimized again;The influence of solar multiples and heat storage duration on annual power generation and the effects of solar radiation,heat transfer fluid flow rate,ambient temperature and ambient wind speed on collector efficiency.The model of trough solar thermal power generation system established in this paper provides a certain reference value for the feasibility study of the actual project engineering,and has certain theoretical significance for the simulation and simulation optimization of CSP system.