【摘要】 为探索真空膜蒸馏纤维膜组件在干燥领域的新型利用方式,本文针对种子等热敏性物料,设计并搭建了真空膜蒸馏-过热蒸汽干燥系统,分析了系统蒸汽流量和热效率的变化规律,在此基础上选取朝天椒辣椒籽作为典型热敏性物料进行干燥品质的实验研究,探索新型干燥工艺的使用场景。研究结果表明:新型干燥系统传热传质性能与真空膜组件相近,随进料温度升高,系统的蒸汽产量也升高且增长速率加快,热效率也升高但增长速率减缓,进料温度为70℃时,系统蒸汽产量高达41 m3/h,热效率达到90.6%,相同干燥温度下,干燥品质优于热风干燥,干燥温度为50℃时,发芽率提升了3.47%。同时对低压过热蒸汽的过热度调控技术进行了探索,对后续应用前景及研究发现进行展望。更多还原

【Abstract】 In order to explore the new utilization of vacuum membrane distillation with fiber membrane modules in the drying field,a vacuum membrane distillation-superheated steam drying system was designed,and the changing rule of the system of membrane flux and thermal efficiency were analyzed,and the drying quality of pod pepper seeds was investigated to explore the application scenarios of the new drying process. The results show that the heat and mass transfer performance of the new drying system is similar to that of the vacuum membrane module. With the increase in feed temperature,the steam output of the system also increases with faster growth rate,while the thermal efficiency increases with lower growth rate,the steam flow reaches 41 m3/h,and the thermal efficiency reaches 90.6% when the feed temperature is 70 ℃,the germination rate is increased by 3. 47% when the drying temperature is 50 ℃.The drying quality is better than hot air drying at the same drying temperature. The control of superheat for low-pressure superheated steam is explored,and future application prospects and research findings are discussed.更多还原