Study Of Flux Distribution Of Parabolic Trough Concentrating System With Optical Errors

Under the background of energy transformation,the importance of solar thermal power generation for building new energy power systems is becoming increasingly apparent.Parabolic trough solar thermal power generation technology is one of the most mature and earliest commercial solar thermal power generation technologies.In practice,there are multiple optical errors in the trough collector at the same time,and their combined effect can cause the flux distribution on the wall of the absorber to deviate from the ideal operating condition.Diagnosing the optical errors in the collector is of great significance for the operation and maintenance of trough solar thermal power plants.The purpose of this paper is to diagnose the possible optical errors of the collector through the flux distribution characteristics,to analyse the degree of influence of the optical errors and to provide numerical results of the errors.The diagnostic results can provide reference for the accurate commissioning of the reflector in the operation and maintenance of the trough solar thermal power plant.Different optical errors will have different effects on the flux distribution.The flux distribution curve under the compound optical errors can be simulated by simulation method.In this paper,the dimension reduction algorithm developed by the research group is improved,and the optical error simulation model of the collector is improved.A traversal and combination analysis strategy is proposed to realize the simulation of flux distribution under compound optical errors.At the same time,flux distribution shooting experiments were conducted to obtain real flux distribution images of the wall of the absorber using the camera-target shooting method.By comparing the real flux distribution curve with the simulation results,the Gaussian slope error,gravity deformation error,mirror deflection error and mirror displacement error of the trough collector were diagnosed.The analysis results show that the mirror deflection and gravity deformation error are the key factors affecting the flux distribution,and their combined effect leads to a multipeaked flux distribution profile and a more uniform distribution along the circumference of the receiver.The mirror displacement affects the intensity and symmetry of the flux distribution,while the slope error has a smaller effect on the flux distribution.The error diagnosis results provide a numerical reference for accurate mirror commissioning in solar plant operation and maintenance.