Research On Design And Operation Characteristics Of Wind-driven Magnetic Eddy Current Heating Device

Magnetic eddy current heating as a new type of wind energy utilization method which is energy-saving,zero emission,no pollution and high utilization of wind energy has attracted more and more attention.In recent years,the rapid development of wind power industry in China has brought about a serious phenomenon of "abandoning wind power limit",which has greatly promoted the development of wind power heating system in China.At the same time,the wind-driven magnetic eddy current heating system has the advantages of simple structure,high wind energy utilization coefficient and more flexible arrangement,and has a wide application prospect.The research on the design and operation characteristics of wind-driven magnetic eddy current heating device is of great significance to improve the utilization efficiency of wind energy in wind-driven magnetic eddy current heating system and to alleviate the problem of "abandoning wind and limiting electricity".Firstly,based on the theory of electromagnetic field and Maxwell's equations,the electromagnetic field of the magnetic eddy current heater is calculated,and the main factors affecting the heating power of the heater are analyzed.Propose an effective way to increase the heating power of the heater.The structure of the heater was designed,including solid steel heater,closed-slot heater and open-slot heater.It provides a model basis for subsequent numerical simulation and parameter optimization of heater structure.Secondly,the distribution of magnetic field and eddy current density in solid steel structure magnetic eddy current heater is analyzed by Maxwell 2D simulation software.The stator wall thickness,air gap thickness and stator material of solid steel heater were changed,and the influence of each factor on the heating power was analyzed.Optimizing the structural design parameters of the heater in order to improve the material utilization and heating power of the heater.On the basis of optimum design of solid steel structure heater,the size,quantity,position of conductor strip in closed-slot heater and the size and quantity of conductor strip in open-slot heater are changed respectively.The influence of each factor on heating power is analyzed.The structure of the heater was further optimized according to the simulation results and the processing technology requirements.Finally,according to the optimized structure of the heater,a wind-driven magnetic eddy current heating system test-bed is built.Experiments on heating power and efficiency of closed-slot and open-slot heaters at different rotational speeds,copper strip number and inlet temperature of circulating water were carried out.According to the comparison between the experimental results and the simulation results of the heating power test of the thermostat at different speeds,the correctness of the software simulation method and the results are verified,which provides a reference for the design of the later heater.