The shortcomings of the traditional supercritical carbon dioxide extractor are as follows： low space utilization ratio of the extractor owing to the extraction basket occupying the cylinder volume;bad mass transfer and heat transfer owing to the gap between extraction basket and cylinder wall.Aiming at the shortcomings,the extractor structure was improved.Double head structure and radial inlet way were adopted,and a filter screen was set up on the head.Based on ANSYS Workbench and FLUENT,the flow field and temperature field of the improved extractor was simulated at both load and zero load.The simulation results were compared in different situations.The results showed that the improved structure promoted the space utilization ratio and improved the uniformity of flow field and temperature field.%传统超临界萃取釜的不足主要表现在：萃取筐占据筒体容积,造成萃取釜空间利用率降低;萃取筐与筒体内壁存在间隙,造成传质、传热效果不良。本文对萃取釜进行结构改造,采用双封头结构,封头上设置筛网,采用径向进气方式。利用ANSYS Workbench及FLUENT软件,模拟了改进结构在空载和装料两种情况下的温度场和流场,对比分析了两种情况下的温度场和流场。比较结果说明,改进后的萃取釜结构不仅提高了萃取釜的空间利用率,而且改善了萃取釜的温度场均匀性,萃取釜的流场均匀性也有提高。
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