Numerical Simulation And Structural Optimization Study On Temperature Field Of Camellia Seed Net Belt Dryer

Drying is an important step in the processing and utilization of camellia seeds,which has a great influence on the storage,oil yield and oil extraction quality of camellia seeds.Therefore,drying to obtain uniform moisture content and high-quality camellia seeds is the drying step Major issues that need to be resolved urgently.At present,most of the equipment used for drying camellia seed is designed by the designer based on experience,or uses general drying equipment for other agricultural products.It lacks theoretical basis and the drying effect is not ideal.In order to improve the drying uniformity and drying quality of Camellia oleifera seeds during processing and utilization,by referring to other drying equipment and combining with the drying process curve of Camellia oleifera seeds,this paper developed a new variable temperature layered oil-tea camellia mesh belt dryer.The main contents and conclusions of this article are as follows:1)Taking camellia seeds as the main research object,the drying characteristics analysis and the determination of basic physical parameters were carried out.The actual density of Camellia oleif'era seeds measured by mass volume method was 1003 kg/m3,and the bulk density was 549.6 kg/m3.The porosity of the layer is 0.452.The average diameter measured by the method of equal volume of camellia seeds and spheres is 12.1mm,which lays the foundation for the numerical simulation of the dryer,the design and the selection of working parameters2)The porous media model was used to replace the Camellia oleifera seed material layer,and the temperature field simulation model of the dryer was established The computational fluid dynamics(CFD)technology was used to numerically simulate and predict the temperature field in the cavity of different inlet structures.The structure of the cavity and the structure of the air outlet of the process curve provide theoretical guidance for the design of the dryer.The results show that the design of the combined air supply port of the air valve can meet the drying requirements of variable temperature.3)Starting from the design basic parameters and design requirements,combined with the results of the temperature field simulation research and the requirements of the camellia seed drying process,first determine the overall structure of the camellia seed dryer using a multilayer mesh belt design to dry the camellia seed.Performed mass and heat balance calculations;then designed and selected the main components of the dryer,such as conveyor belts,prime movers and worm turbine reducers,box frames,air outlets,fans,and insulation material thicknesses Calculate and create a three-dimensional solid model of camellia seed dryer based on SolidWorks three-dimensional software,complete the structure design of the whole belt dryer,and lay the foundation for later experiments.4)After completing the manufacturing and debugging work of the prototype,the sensor position distribution scheme was designed,and a complete data collection system was built.At the same time,the prototype verification test was carried out,and the experimental measurement data and simulation data were analyzed and studied.The results show that the error between the experimental measurement result and the simulated value is small,the difference range is generally around 2?3?,the measurement data deviation of some location points is relatively large,and the difference is 3?5?.It can meet the actual drying requirements and verify the accuracy of numerical simulation and the rationality of prototype designIn summary,the camellia seed mesh belt dryer developed in this paper can basically meet the drying requirements in terms of functions.The multilayer mesh belt design scheme can greatly reduce the footprint and can be turned over many times during the drying process.Accelerating the process of transferring heat and quality is of great significance to the development of the camellia seed processing industry and can provide certain data references and technical support for the subsequent research and development design of related agricultural and forestry product dryers.