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.