内置渐变结构介质天线的微波反应器加热性能研究

Study on Heating Performance of Microwave Reactors with Built-in Gradient Structure Dielectric Antennas

催化氧化是现有市场上销毁低浓度VOCs的主流技术,现有工艺采用电加热方式加热催化床层,其不足之处是效率低、升温速率慢。采用微波选择性加热催化床层具有升温速率快、能耗低的优势。然而作为一种新型的加热方式,目前腔体中微波加热仍然存在一些问题,例如不均匀性、低效率以及热失控,这些问题限制了微波加热的大规模应用。针对这一现状,基于阻抗匹配理论,设计了一种包括介质天线辐射器的新型微波加热系统,用于加热催化床层。建立了基于电磁学和固体传热的多物理场模型,使用COMSOL进行了数值计算和实验研究。结果表明,实验和仿真结果吻合,该系统可以实现对催化床层的高效率和高均匀性加热,同时具有较低的热失控风险。这项研究为微波加热技术的发展提供了新的思路和方法。

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.