A Dynamic Simulation Model Integrated The Heliostats Field And Central Receiver For Molten Salt Solar Power Tower

The energy problem has become an important factor restricting the further development of economy,so all the countries in the world turn to renewable energy.During the construction of the western energy base,solar power tower station technology,as one of the key supporting technologies,is coming to the stage of largescale development.According to the operation of the solar power tower station,the failure of the molten salt receiver has seriously affected the economy of the station.In this paper,the heat collection and absorption processes of a 50 MW solar power tower station are set as the research object.The simulation model of the heliostat is developed by using the Monte Carlo ray tracing method.According to the arrangement of the heliostat field,the simulation model of the collector field composed of 5273 heliostats is developed.A dynamic simulation model of external molten salt receiver system is established based on modular modeling method.A real-time dynamic simulation model of the integrated heat-collecting and heat-absorbing system of the molten salt solar power tower station is developed by coupling the above simulation models on the simulation platform iSimu.The validity of the model is verified according to the operation data of Solar Two power station.Using the real-time dynamic simulation model of the integration of heatcollecting and heat-absorbing of the solar power tower station,the non-uniform and time-varying characteristics of energy flux density on the surface of molten salt receiver and the dynamic characteristics of external receiver under different operating conditions are studied.It is found that the maximum point of energy flux density on the surface of the tube panel moves sequentially from the 1 st tube to the 4th with the change of time through the simulation study.At the same time,the energy flux density of the last 4 tube panels decreases gradually along the order of panel arrangement.The disturbance experiments of DNI,inlet molten salt flow rate and inlet molten salt temperature are carried out.The thermal stress model of external molten salt receiver tube panel is established,and the variation characteristics of thermal stress of panel in typical off-design conditions are studied.The integrated simulation model integrated the heliostats field and central receiver for molten salt solar power tower established in this paper can be used as a platform for the formulation and optimization of the control strategy of the heliostat field for solar power tower station.The conclusions are of great significance to the establishment of photothermal coupling control strategy for molten salt solar power station.