凹弧面内筒壁对微波反应器加热效率及均匀性的影响

Influence of the cylindrical inner wall for concave cambered surface to microwave heating efficiency and uniformity

微波加热过程中普遍存在电磁场能量分布均匀性差的问题,这将导致物料被非均匀加热,进而引发热点甚至热失控,制约了微波加热的推广。通过在玻璃内筒壁上加工凹弧面,利用凹弧面对微波具有多次漫反射的特点,提高电磁场分布的均匀性。在建模的基础上,利用HFSS软件仿真研究玻璃内筒壁上凹弧面参数对微波反应腔内电磁场分布的影响。研究表明,当凹弧面半径r=12mm时,在不牺牲加热效率的前提下,反应物料内微波场分布均匀性可提高10.7%。

The non-uniformity of electromagnetic field distribution in the process of the microwave heating directly leads to the material being non-uniform heating and cause hot even thermal runaway problem, it constraints of the microwave heating widespread application. The inner cylinder of glass process on concave cambered surface, the uniformity of the electromagnetic field distribution is aimed to be improved by the characteristics of multiple orientations microwave reflection from concave arc in the microwave cavity. On the basis of the model, effect the parameters of concave cambered surface on electric field distribution in the cavity was numerically investigated by using HFSS software. It was concluded that under the premise without sacrificing the heating efficiency ,when the radius of concave surface is 12mm ,the reaction material in microwave field distribution uniformity can be increased by 10.7%.