Simulation study of the susceptor assisted microwave high-temperature reactor heating based on fully coupled electromagnetic thermal fluid

Microwave heating is widely used in the industrial field because of its high efficiency, fast and uniform characteristics. However, due to the selective heating characteristic, the coupling effect between microwave and weak microwave absorbing material is not obvious, which limits the application of microwave in industrial field. Therefore, the external susceptor (SiC) was introduced into the microwave reac-tor, and a finite element simulation model was established based on the electromagnetic-thermal-fluid coupling theory to explore the influence of different receptor configuration on the microwave heating of weak absorbing materials. The results show that the design of the external susceptors should not only con-sider the influence of the external susceptors on the electric field distribution of materials, but also con-sider the energy transfer between materials and susceptors, so as to achieve the optimal energy conversion balance between the susceptors assisted heating and the microwave volume heating material; When the susceptor is placed on both sides of the material and parallel to the waveguide side, the assisted heating effect is the best, the average temperature at 500 s is 918. 86 ℃, and the COV_T is 0. 133 6; In high-tem-perature microwave reactor, thermal radiation is the main heat transfer mode, and the higher the tempera-ture, the more intense the heat transfer.