Research On Vacuum Dedusting Device For Photovoltaic Module Based On Supersonic Airflow Adsorption Mechanism

In the 21st century,fossil energy is becoming increasingly tense,and the development of photovoltaic power generation technology is imperative.The world is striving to promote the development of the solar power industry,and its proportion in the overall global energy structure has increased year by year.Because most of the photovoltaic modules are placed in an outdoor environment,the surface of the photovoltaic panel will accumulate dust particles in many environments,which will not only reduce the efficiency of photovoltaic power generation,but also reduce its service life.Based on the current research and design of multi-stage expansion chamber dust-removing air knives,this paper aims to study the phenomenon of dust-removing devices on the surface of photovoltaic modules based on supersonic airflow adsorption mechanism,aiming at designing dust collection.Dust-removing equipment for photovoltaic power stations with vacuuming.The main contents and conclusions of the thesis are as follows:1.The vacuum cleaner works according to the principle of supersonic nozzle.A supersonic nozzle model is established by Solidworks software and the key parameters(intake pressure,contraction angle,expansion angle and ratio of tube diameter)are carried out using FLUENT software.The 108 sets of comprehensive flow field simulation tests of the ratio of the diameters were used to understand the injection conditions of the airflow under different conditions,and the causes of the formation were analyzed.The key factors affecting the jet velocity are obtained.2.Using the Design Expert software to analyze the data from 108 comprehensive experiments,a total of 6 sets of 3D response surfaces for the exit airflow velocity were obtained.Each response surface involved two influencing factors.After analysis,a structure with an inlet pressure of 0.8 MPa,a tube diameter ratio of 2.5,a contraction angle of 60°,and an expansion angle of 8°was selected.The flow field simulation is used to further analyze the airflow field defects in the dust collecting device,and the targeted structure is improved to optimize the airflow motion.3.According to the floating dust above the photovoltaic panel,the dust element discrete element model is established by EDEM software,the flow field simulation is carried out in the area between the air outlet of the dust removal module and the suction port of the vacuum module,and the movement of the particles is analyzed by means of CFD-DEM coupling.In order to verify its vacuum function,it provides a theoretical basis for the design of photovoltaic module cleaning equipment.4.According to the parameters of the multi-stage expansion chamber nozzle and the dust collecting device,the test bench is set up to test the dust removal performance,and the accuracy of the simulation results is verified.The high-speed imaging of the dust movement state under the action of the airflow further verify the function of the vacuum module.