Research On Heating Process Control Of A High-Power Industrial Microwave Oven With Magnetron Cooling Water Recycling

This thesis presents a comprehensive study on designing and developing a control system for a high-power industrial microwave heating device(Microwave Oven),focusing on controlling and monitoring the temperature of the high-power microwave oven and the magnetron cooling water recycling process.The project aims to improve the efficiency and sustainability of the microwave heating process,which is widely used in industrial applications.The control system adopts the PID control algorithm and STM32 microcontroller.Explains the simulation using the traditional and expert PID control algorithm with MATLAB and Simulink.The firmware development and programming of the microcontroller are carried out using Keil Uvision5 IDE software and used the PID controller and UART Assist Software to monitor the temperature of the microwave oven.Chapter 1 introduces the research background and significance of the project.The chapter starts by discussing the characteristics and applications of high-power industrial microwave heating devices and the current research and development status of the microwave oven.Then,the research status of temperature control of the microwave heating process is reviewed,followed by the introduction of the control strategy and water recycling as the primary research content of the project.The chapter concludes with a problem statement,the project’s scope,primary research content,and chapter arrangement.Chapter 2 provides a theoretical analysis and review of the project.The chapter begins with a workflow chart of the research.Then discussed the microwave heating principle and characteristics,including the interaction of microwave electromagnetic waves with matter and the advantages and limitations of microwave heating.Then,the control system is discussed,focusing on closed-loop control and PID controllers.Finally,the theoretical analysis of water recycling methodology is presented,including the methods and technologies of water recycling and the mathematical explanation of the water recycling process.Chapter3 describes the design and development of hardware and programming.The chapter begins with an overall research plan,research methods,and technical approaches,including the control system composition and electrical circuit design,the heat transfer mechanism of the microwave heating and temperature control,the strategy for the equipment’s monitoring and safety interlock,and the water recycling process design.The chapter then presents the programming code with software simulation,including using Keil Uvision5 IDE for programming and the traditional PID and expert PID controller simulation with MATLAB and Simulink.Chapter 4 describes the practical experiment of the project with component details.The chapter presents the equipment and experimental site situations,including the high-power industrial microwave heating device and the temperature control and monitoring system.The realistic set-up of the temperature control and monitoring with water and electricity supply system is described,including the 3-phase electricity supply system,the STM32 MCU,the MAX 6675 amplifier module,and the K-type thermocouple sensor.Chapter 5 describes the project’s results and conclusions,as well as the research’s contributions.This chapter also highlights the study’s limitations and suggestions for future work.In the results section,a closed-loop feedback control system utilized a PID control algorithm to regulate the temperature of a microwave-heated object based on the input from a K-type thermocouple sensor.The thesis contributes to advancing the research and development of microwave heating and water recycling system,which have great potential to improve sustainability efficiency.