Ying Duan, Xiao-gen Yi, Qing-long Xie, Zheng-ai Weng, Peng Yuan,
Yong Nie*
Biodiesel Engineering Lab of China Petroleum & Chemical Industry
Federation, Zhejiang Province Key Lab of Biofuel, Zhejiang University of
Technology, Hangzhou, 310014, Zhejiang, P. R. China
Significance: The reactors with microwave absorbent bed can
work continuously and efficiently to pyrolysis reactions, which makes it
potential for the scale-up. Uniform stability of the bed surface
temperature distribution is key to the scale-up. Due to the
economics of using multiple
low-power magnetrons and the heat transfer uniqueness in large-scale
microwave device, this study examines the effect of working magnetrons
layout on the temperature distribution of the bed surface in a
large-scale microwave pyrolysis reactor.
Abstract:Microwave
reactors equipped with microwave absorbent as high-temperature bed are
effective for the pyrolysis reactions. The uniformity and stability of
temperature distribution on the microwave absorbent bed surface is
important to the microwave pyrolysis reactor especially in the
large-scale reactor. Herein, the
temperature distribution on the SiC microwave absorbent bed in a
large-scale microwave pyrolysis reactor without feeding was examined by
both infrared thermography and simulation.
Considering
the economics of using multiple low-power magnetrons in large-scale
reactor, the effect of the working magnetrons location on the heating
rate of bed surface and the COV of temperature distribution was
investigated. The results showed that more uniform and stable
temperature distribution of bed surface in the large-scale reactor was
obtained when the magnetrons located at the bottom of the reactor were
in use. This study provides guidance for the scale-up of
microwave-assisted pyrolysis reactor with multiple low-power magnetrons.
Keywords: microwave-assisted
pyrolysis, large-scale reactor, temperature distribution,
magnetron position