【摘要】 针对有色金属废水处理难题,蒸发处理含重金属离子的废水,改善微波加热均匀性和微波闪蒸效率.根据微波谐振腔的腔壁微扰理论,结合准光学腔的稳定性条件,对圆柱形的微波闪蒸装置的结构进行更改,设计了一种新型的准光学微波闪蒸多模腔体.通过分析给出了微扰程度对反应腔体内场分布的影响,在微扰限度内,通过优化改善腔体内的谐振模式数分布,改善微波加热的均匀性,获得最优化的腔体尺寸,并利用基于有限元算法的三维电磁仿真软件HFSS,对微扰前后闪蒸腔体内的场分布进行数值模拟.模拟结果表明基于理论设计的新型准光学微波闪蒸多模腔体内场分布更均匀,场强更强,热点现象明显减弱,可以有效避免蒸发加热过程中的过冷或过热现象.更多还原

【Abstract】 To handle wastewater produced by non-ferrous metals,to purify the wastewater containing heavy metal ions from zinc hydrometallurgy factory,and to improve the uniformity of microwave heating and the efficiency of microwave flash,a novel quasi-optical microwave flash multimode cavity is designed and mainly applied to microwave heating,such as microwave evaporation. According to perturbation theory of the cavity wall of microwave resonator,the cavity wall is protruded a little based on the principle of quasi-optical resonator. The effect of perturbation on field distribution is analyzed programmatically. Within the limits of perturbation,the size of the cavity is optimized to increase the number of modes of the cavity and to improve the uniformity of microwave heating. And the distribution of electric field strengths in the cavity before and after perturbation is simulated by High Frequency Structure Simulator( HFSS). The outcomes demonstrate that the distribution of electromagnetic field is more uniform in quasi-optical microwave flash multimode cavity and the electric field intensity is stronger than that in cylindrical resonant cavity. Moreover,the phenomenon of the hot spot is obviously weakened,thus the occurrence of overcooling or overheating in the process of heating is avoided to some extent.更多还原