2.1 Experimental Setup
A microwave-assisted non-premixed pyrolysis large-scale reactor with the microwave power of 10 kW was developed. As shown in Figure 1, the reactor mainly included ten water-cooled microwave magnetrons with the power of 1 kW and frequency of 2450 MHz; a cubic resonant cavity with three microwave magnetrons distributed at the left, three at the right and four at the bottom of the cavity, respectively; ceramic fiber cotton; a quartz crucible with the inner diameter of 0.6 m; a ceramic fiber plate with the diameter of 0.57 m and thickness of 0.025 m; SiC bed with the diameter of 0.5 m and thickness of 0.05 m with the SiC particles of 1-3 mm; and a microwave shielding thermocouple with the temperature signal controlling the microwave magnetrons to be on or off to maintain the temperature of SiC bed stable.
The self-designed temperature measurement system mainly included a FLIR infrared thermal imager with its workstation, a stainless steel cylindrical protective cover with the height of 2 m for heat insulation and microwave shielding, a manhole for loading the SiC bed, a germanium glass window with the transmittance of 0.95, a thermal imager heat shield with fan and chilled water circulation, stainless steel wire mesh to avoid the microwave leakage, and a microwave leakage detector.