Drying characteristics and drying kinetics modeling of Antarctic krill spiral bushing heated drying
To grasp the drying characteristics of Antarctic krill(Euphausia superba)under the heating conditions of the spiral bushing heating,a drying model was established to simulate the moisture migration pattern during the drying process accurately.The trends of moisture content,drying rate,the effective diffusion coefficient of moisture and activation energy of drying of Antarctic krill were investigated at different drying temperatures(90℃,110℃,130℃),stack thicknesses(10 cm,20 cm,30 cm)and stirring speeds(4 r/min,6 r/min,8 r/min).The drying curves were analyzed,and the experimental data were fitted by eight classical drying models chosen to simulate the moisture migration accurately during the drying process.Eight classical drying models were selected to fit the experimental data.The coefficient of determination R2,the chi-square test value X2,and the root mean square error RMSE were used as the evaluation indexes of the model fitting effect to determine the optimal drying model,and regression analysis was carried out on the model parameters to obtain the most suitable drying model fitting equations.The results showed that:the drying process of Antarctic krill spiral bushing heated drying belongs to the descending speed drying;the drying rate reaches the maximum value within 10min from the beginning of drying;the descending drying stage is the main stage of drying,and the constant-speed drying stage is less;the relationship of effective moisture diffusion coefficient of the Antarctic krill is drying temperature>stack thickness>stirring speeds;and the effective diffusion coefficient of moisture within the range of test conditions is 1.920 9×10-9-3.971 7×10-9,and the activation energy of drying is 15.64 kJ/mol,which is easy to dry;the Logarithmic model is the best model for the heating and drying of Antarctic krill spiral bushing heated drying,and the fitted equation of this model can predict the change of moisture ratio in the drying process of Antarctic krill better.The study results can provide a new drying mode for the processing of Antarctic krill powder,and provide theoretical basis and technical support for the research and development of spiral bushing heating and drying process and equipment development.
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