高效连续真空低温式鱼粉干燥设备的研究

发布时间：2019-07-02 10:12

【摘要】：鱼粉营养丰富,是水产饲料中不可或缺的组成部分。采用真空低温干燥可以降低水分的沸点,有效避免高温对蛋白质的氧化程度,从而获得高质量的鱼粉产品。本文主要针对高效连续低温式真空干燥设备进行了研究,确定了适合真空干燥设备的干燥工艺流程,针对真空设备的关键技术进行了真空进出料设备的结构设计,保证真空干燥过程所需的真空环境。根据鱼粉生产状况和环境工况,重点对真空干燥设备的本机真空干燥机进行了结构研究设计。此外,对真空干燥机的主轴进行了热应力分析。真空干燥的关键的问题是解决密封问题。课题分别从真空进出料辅助设备及干燥机本机结构两方面进行研究。一方面,通过研究进出料过程,研究了真空进出料机、密封绞龙、关风机等密封装置,保证鱼粉在进出料时隔绝外界空气,保证其处于真空状态;另一方面,对主轴与干燥机筒体间进行密封结构设计,保证在工作时干燥机筒体内部达到并保持生产要求的真空状态。根据设计基础参数,通过物料衡算和热量衡算,计算出了真空干燥机完成生产任务所需的总传热面积,并据此初步确定设备的外形尺寸,再根据零件间的结构关系完成各零部件的具体结构尺寸设计,主要包括筒体结合件、主轴结合件、传动系统及真空系统的设计。并在完成整体结构的设计后对加热面积进行校准,使其达到设计要求。此外,根据温度场热应力计算理论,通过patran软件,对主轴进行了热应力分析。由于主轴长度较长,且盘管分布密集且有规律,为简化计算,选取蒸汽进入端的主轴部分进行分析计算,得到主轴加热盘管温度分布云图、热应力云图和热变形云图。
[Abstract]:The fish meal is rich in nutrition and is an integral part of the water-producing feed. The high-quality fish meal product is obtained by adopting a vacuum low-temperature drying to lower the boiling point of the water and effectively avoiding the oxidation degree of the high-temperature to the protein. In this paper, the high-efficiency continuous low-temperature vacuum drying equipment is studied, the drying process of vacuum drying equipment is determined, the key technology of the vacuum equipment is designed, and the vacuum environment required in the vacuum drying process is guaranteed. According to the production condition of fish meal and the working condition of the environment, the structure research and design of the vacuum drying machine of the vacuum drying equipment are given. In addition, the main shaft of the vacuum dryer was subjected to thermal stress analysis. The key problem of vacuum drying is to solve the sealing problem. This paper studies the two aspects of the auxiliary equipment and the local structure of the dryer from the vacuum inlet and outlet. On the one hand, by studying the feeding and discharging process, the sealing device such as a vacuum inlet and outlet machine, a sealing auger, an off fan and the like is researched, the outside air is isolated when the fish meal is in and out of the material, and the vacuum state is ensured; on the other hand, the sealing structure design between the main shaft and the dryer cylinder body is carried out, So as to ensure that the inside of the dryer barrel reaches and maintains the vacuum state of the production requirement during operation. according to the design basic parameters, the total heat transfer area required by the vacuum dryer to finish the production task is calculated through the material balance calculation and the heat balance calculation, the overall dimension of the equipment is preliminarily determined, and the specific structural dimension design of each component is finished according to the structural relationship among the parts, It mainly includes the design of the barrel combination, the main shaft coupling, the transmission system and the vacuum system. And the heating area is calibrated after the design of the whole structure is finished, so that the design requirement is met. In addition, according to the thermal stress calculation theory of the temperature field, the main shaft is subjected to thermal stress analysis through the patran software. Because the length of the main shaft is long, and the coil distribution is dense and regular, the main shaft part of the steam inlet end is selected to be analyzed and calculated to obtain the temperature distribution cloud image, the thermal stress cloud image and the thermal deformation cloud image of the main shaft heating coil.
【学位授予单位】：浙江海洋学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S817.12

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