A Coaxial Microwave Applicator for Direct Heating of Liquids Filling Chemical Reactors
A Coaxial Microwave Applicator for Direct Heating of Liquids Filling Chemical Reactors
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用于直接加热液体填充化学反应器的同轴微波加热器
DOI：
10.1109/tmtt.2009.2027170
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发表时间：
2009
影响因子：
4.3
通讯作者：
A. Ricci
中科院分区：
文献类型：
--
作者：
G. B. Gentili;M. Linari;I. Longo;A. Ricci
描述了一种在化学反应器内容纳的液体介质中辐射的同轴微波施加器。施加器由几乎各向同性辐射的绝缘非对称偶极天线组成。因此，它似乎非常适合于直接加热填充容器的介质，使得不需要像目前在微波辅助化学中所做的那样使用微波炉。首先回顾了在高介电常数有耗介质中发射的绝缘偶极天线的电磁（EM）特性，以定义施加器设计标准。一个3-D的数值EM求解器，然后考虑到反应器的整体结构，分析在周围介质中的辐射的施加器。施用器-容器机械连接的正确设计始终确保安全操作，从而大幅减少不必要的杂散辐射。理论分析和进行的实验之间的协议是好的，从而确认，同轴施加器相比，有利的激活，使用单一或多模谐振EM腔的传统方法。
A coaxial microwave applicator radiating in a liquid medium contained inside a chemical reactor is described. The applicator consists of an insulated asymmetrical dipole antenna that radiates almost isotropically. Hence, it appears well suited to directly heat the medium that fills the vessel, making it unnecessary to use a microwave oven as currently done in microwave assisted chemistry. The electromagnetic (EM) properties of the insulated dipole antenna emitting in high permittivity lossy media are first reviewed to define the applicator design criteria. A 3-D numerical EM solver is then employed to analyze the radiation of the applicator in the surrounding medium taking into account the whole structure of the reactor. Safe operations are always assured by the proper design of the applicator-vessel mechanical connection that drastically reduces unwanted stray radiation. The agreement between the theoretical analysis and the experiments performed is good, thus confirming that the coaxial applicator compares favorably with the traditional methods of activation, which use a single or multimode resonant EM cavity.