4 Conclusion
In summary, the temperature distribution of the SiC bed surface heated by four 1 kW magnetrons in a self-designed microwave-assisted pyrolysis large-scale reactor was investigated by the infrared thermography and simulation. The effect of working magnetrons position on the temperature distribution was examined. The results showed that the temperature distribution of the bed surface was more uniform and stable when the magnetrons located at the bottom of the reactor were used. The strategy of experimental measurement for determination of the temperature distribution on the bed surface in the microwave large-scale device would promote the industrial application of the microwave heating technology.