Temperature Field Analysis And Experimental Study Of Disc Type Solar Heat Receiver

Solar thermal power generation system is one of the most important ways to use solar energy efficiently.The accuracy of solar tracking control system is the key factor affecting the efficiency of solar thermal power system.At present,the solar tracking control mode mainly adopts the hybrid tracking control mode which combines day of sight tracking and sensor tracking.In the traditional sensor tracking control system,the concentrator can track the position of the sun by collecting the intensity signal of the incident light.Due to the errors of mechanic and control system,the solar heat receiver aligns with the sun,but the reflection spot deviates from the central position of the solar heat receiver,which results in the decrease of energy collection efficiency of the system.In this paper,an innovative automatic tracking method is proposed to obtain the temperature field distribution in the solar heat receiver by using the existing temperature sensors which are layered and evenly arranged in the solar heat receiver,and to analyze the sun's moving angle by analyzing the temperature field offset.Based on the basic theory of heat transfer,a mathematical model of temperature field is established by using numerical heat transfer calculation method.According to the temperature sensor,the temperature data of the measuring points in the reflecting spot are collected,and the temperature field formed when the solar rays are reflected by the solar heat receiver is simulated and calculated.Through the temperature data collected by temperature sensors,the temperature field distribution of flat-plate solar heat receiver is simulated and analyzed by using MATLAB software.The coordinate algorithm of temperature field center is designed,and the position relationship between temperature field center and geometric center of the solar heat receiver is analyzed and calculated.The experimental platform of tracking control system of small dish solar temperature sensor is designed,and the mechanical knot of the system is completed.Structure,electrical control and software design;solar tracking control experiment based on temperature field feedback of the solar heat receiver is carried out using the experimental platform,and the simulation temperature field center temperature point coordinate algorithm is verified.The experimental results show that the tracking error can be effectively controlled by filtering the collected temperature data multiple times,increasing the reliability of the collected data and increasing the system adjustment time in the experimental temperature range.After applying the coordinate algorithm of temperature point in the center of temperature field,the system can effectively track the position of the sun,which verifies the feasibility of the design algorithm in the tracking and control system of disc solar temperature sensor,and provides a new choice for the development of tracking and feedback technology of solar thermal power generation system.