端口开启方式对麦秆微波加热的影响

运用Comsol Multiphysics软件对3端口微波设备加热麦秆粉末进行建模和仿真,研究微波设备开启单个端口和多个端口组合对麦秆粉末升温的影响.对微波设备右侧端口、右侧和左侧端口开启、3端口共同开启的仿真加热情况进行验证,发现测温点的升温曲线与仿真一致.3个端口对麦秆粉末分别单独加热时,热点会出现在不同的位置,并...

Effect of port opening method on the microwave heating of wheat straw

Virtual modeling and numerical simulation of microwave equipment and straw powder were carried out by Comsol Multiphysics software to study the effects of wave ports at different positions and multiple wave ports combined on straw powder heating. The experimental results were verified by simulation of the heating conditions of the right port, the right port and the left port open, and the three ports open together. It was found that the heating curve of the experimental temperature measuring point was consistent with that of the simulation, indicating that the model was verifiable. When the wave ports at different positions heated the straw powder separately, the hot spots would appear at different positions, and the heating effect on the material was greatly different. When multiple ports are opened together, the hot spot shape and position of straw powder was changed and the temperature in the central area of the hot spot decreases to some extent. Under the same power, the average heating rate of single port opening is faster than that of multi-port combination. The average heating rate under single port opening on the left side is the fastest, which is more than twice that of single port opening on the right and back side. In the case of multi-port heating, it has an optimization effect on the hot and cold points caused by microwave heating, and the peak of the average temperature gradient is reduced by about 22.7%. In terms of the material heating uniformity, multiple wave ports can be considered to ensure the material heating uniformity, although the energy loss will increase. However, it can be used to improve the heating uniformity of wheat straw in the case of sufficient energy input.