Experimental Study On Condensation Synergistic Drying Technology Of Peanut Pods

China’s drying technology has gradually moved from traditional methods（including sun drying and drying treatment）to mechanized,intelligent,and efficient grain drying machinery and equipment.China ranks first in the world in terms of peanut planting area and yield.According to statistics,the annual yield of peanuts in 2022 is approximately 14.3 million tons,accounting for 40.27%of the world’s total peanut production.At present,the peanut pod drying techniques used in China mainly rely on sun drying and hot air drying,but their disadvantages are low efficiency,high energy consumption,and high pollution.This article is based on a new drying technology（condensation enhanced drying）,and conducts experimental research on the energy-saving effect of peanut pod drying technology.The main research content is as follows:（1）This article takes fresh peanut pods as samples.Wet peanut shells and wet peanut kernels account for 24.21%and 75.79%of the total weight of peanuts,respectively.The shell length is about 39.97mm,the width is about 13.33mm,and the initial moisture content is34.33%.In the study,the precipitation curve of peanut pods was obtained.As the drying time increases,the precipitation rate of peanut pods decreases,and finally the precipitation curve tends to be straight.Regression analysis was conducted on the peanut pod drying experimental model,and it was found that the predicted values of the Page model fitted well with the actual values.（2）The relationship between wind temperature,wind speed,and material layer thickness,as well as the precipitation rate and unit energy consumption of peanut pods,was analyzed through a single factor experiment of condensation enhanced drying of peanut pods.The results indicate that within a certain range,with the increase of hot air temperature and wind speed,the drying rate of peanut pods becomes faster,the thickness of the material layer is lower,and the drying rate of peanut pods is also faster.However,within a certain range,with the increase of hot air temperature and wind speed,the unit energy consumption of peanut pod drying shows a trend of first decreasing and then increasing.As the thickness of the material layer increases,the unit energy consumption gradually decreases.Select the range of orthogonal experimental parameters,which are the hot air temperature range of 48℃～64℃,the hot air wind speed range of 0.8m/s～1.2m/s,and the material layer thickness range of 3cm～6cm.（3）The was used in the optimization test of peanut pod condensation efficiency enhancement process L₉3⁴Orthogonal test method,taking drying time and unit energy consumption as evaluation indicators,measured the best drying time and unit energy consumption process parameters,which are hot air temperature of 56℃,hot air velocity of 1.2m/s,and material layer thickness of 6 cm.The energy-saving effect of the condensation drying process for peanut pods was tested.The temperature of the hot air was controlled at 56℃,and the wind speed of the hot air was 1.2 m/s.The peanut pods filled the test bed,and the thickness of the material layer was about 18 cm,.After three verifications,the optimal unit energy consumption parameter is 19535.33 KJ/kg.（4）An experiment was conducted on the sensory evaluation and fatty acid value content of dried peanut pods.The sensory evaluation showed that temperature above 64℃can lead to the rupture of peanut coat and kernel,affecting the quality of peanut pods.The fatty acid value test shows that the fatty acid value of peanut pods gradually increases with the increase of drying temperature.Excessive temperature can lead to the loss of nutritional value of peanut pods and is not conducive to storage.