| China is a country with a large population and the demand for grain and oil is huge.Although there are many grain and oil processing enterprises and processing points,there are few basic theories of grain and oil processing and few scientific and technological innovations.In view of this situation,with camellia seed as the research object,the experimental study of the plunger pressing process was carried out,and the multiphysics simulation analysis was used to study how the oil material deforms and how the oil flows during the pressing process by using the multiphysics simulation software COMSOL,and then a special oil processing platform App was created to study and analyze the oil processing process in this paper.The main research contents are as follows:(1)The experimental study and mathematical modeling of the stress-strain characteristics of oil-tea Camellia seed during the pressing process were carried out.A kind of oil-tea Camellia seed from Hubei Province was taked as the pressing object,then the self-made limited oil drain plunger press device was used to press the three kinds of 20g/30g/40 g oil-tea Camellia seed at four kinds of loading rates of 0.01 k N/0.02 k N/0.04 k N/0.06 k N,and the stress-strain curve was obtained.Furthermore,mathematical modeling was established by Kawakita's Equation,and the mathematical model of the stress-strain relationship at four loading rates was obtained.The curve corresponding to the mathematical model was compared with the experimental data,and the scattered points of the measured data were found to fluctuate around the established mathematical model curve,which indicated that the mathematical model established by using the Kawakita's Equation was accurate.(2)The experimental study and mathematical modeling of the realistic compression ratio of oil-tea Camellia seed during the pressing process were carried out.Based on the stress-strain relationship data,the relationship between the realistic compression ratio and the pressing pressure is derived.According to the experimental data,the mathematical model of the realistic compression ratio of oil-tea Camellia seed is established by using Kawakita's Equation,and the data issimulated.The results show that the mathematical model of the actual compression ratio is correct.(3)Exploring the relationship between oil yield of oil-tea Camellia seed and pressing pressure.40 g oil camellia seeds were loaded to 6 pressure levels(10,20,30,40,50 MPa and 60MPa)at a loading rate of 0.04 k N / s to obtain the data of oil yield and pressing pressure,and the formula of the relationship between oil yield and pressing pressure was fitted.(4)The COMSOL software was used to simulate the multiphysics coupling of the plunger press processing.First,COMSOL was used to model multiphysics coupling,that is fluid-structure coupling.Then,the created multiphysics coupling model was used to analyze and study the change of oil flow velocity during the pressing process.In addition,through the analysis of the created saturated porous media model,a calculation formula for calculating the amount of oil in the simulation was customized,and its rationality was verified.Furthermore,by changing the different oil extraction parameters(material layer height,loading rate,making pressure-holding stage)to explore the effect on the oil yield,it was finally found that: when the loading rate is 0.04KN/s,the holding pressure is 25 MPa,the pressure-holding time 20 min is a more reasonable choice.(5)Based on COMSOL,a special oil-tea seed oil pressing simulation platform app was created.The entire App can run independently,consisting of the main window function area and the main interface.The form design and method editor are mainly used to design and develop the interface.The form editor is mainly used to design the interface,and the method editor is used for programming control.The main interface of the entire App is controlled by a main form composed of 7 sub forms.After the app is built,you can change some parameters to view the porosity,oil-tea Camellia seeds deformation,oil outflow speed,and global flow velocity changes at different times. |
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