Study on Heating Performance of Microwave Reactors with Built-in Gradient Structure Dielectric Antennas
Catalytic oxidation is the mainstream tech-nology for destroying low-concentration VOCs in the existing market.The existing process uses electric heating to heat the catalytic bed layer,but its short-comings are low efficiency and slow heating rate.Mi-crowave selective heating of catalytic bed has the ad-vantages of fast heating rate and low energy consump-tion.However,as a new heating method,microwave heating in cavity still has some problems,such as non-uniformity,low efficiency and thermal runaway,which limit the large-scale application of microwave heating.Based on the impedance matching theory,a new microwave heating system including dielectric antenna radiator was designed to heat the catalytic bed.A multi-physics model based on electromagnet-ism and solid heat transfer was established,and nu-merical calculation and experimental research were carried out by COMSOL.The results showed that the experimental results agreed with the simulation re-sults,and the system can achieve high efficiency and high uniformity heating of the catalytic bed with low risk of thermal runaway.This research provided a new idea and method for the development of micro-wave heating technology.
low concentration of volatile gasesdie-lectric antennamicrowave heatingmicrowave reac-torcatalytic bedthermal runawayimpedance matching theory
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