微波馈入位置对固体催化剂加热效果的影响

The Effects of Microwave Feed-in Positions on its Heating Performance of Solid Catalysts

本研究考察了微波从底部馈入反应器和从侧面馈入反应器时对固体催化剂的加热效果。从微波介电加热和热传导的物理规律出发,建立了两种不同微波馈入位置时对催化剂床层加热的模型,并通过COMSOL Multiphysics软件模拟分析其对加热效果的影响。结果表明:当采用底部馈入方式进行加热时,电磁场强度在下部分布较强很高,但在距离馈入口较远的区域电磁场强度较低,最终得到的温度分布均匀性较差;当采用微波从侧面馈入的方式进行加热时,催化剂床层区域的电场强度较大,且温度分布比较均匀。

Microwave heating performance of solid catalyst was investigated by using two microwave feed-in positions. Two kinds of microwave heating models were conducted based on the physical laws of microwave heating and heat transfer. The effects of both modes were analyzed through COMSOL Mul- tiphysicssoftware. It was found that the electromagnetic field （EM） strength is higher near the feeding point if microwave equipped through the bottom of the reactor, but lower at the region in the far distance from the feeding point. The temperature distribution within the solid catalysts is found non-uniformly. If microwave was introduced directly through the side of the reactor, the heating area and the EM strength can be enhanced and the distribution is much more uniform.