Variable Temperature Drying Characteristics and Process Parameters Optimization of Maize Thin Layer
To improve the drying quality of corn and reduce the drying energy consumption,based on the previ-ous research on grain drying,the influence of temperature change drying technology on the drying characteristics and quality of corn was studied.Initial drying temperature(45-70 ℃),moisture content of conversion temperature(18％-26％),temperature rise range(5-25 ℃),tempering ratio(1∶1,2∶1,3∶1,4∶1,5∶1)and other experi-mental factors on maize drying rate and appearance quality(crack rate and color difference);the multiple quadratic regression orthogonal rotating combination test method was adopted,with initial drying temperature,moisture content at transition temperature,temperature rise range and tempering ratio as test factors,crack rate and color difference as target response values.The regression model and response surface diagram were established to analyze the drying characteristics of maize at variable temperature and explain the causes of the results.Through single factor analysis,the results indicated that,the initial drying temperature was 45-55 ℃,the moisture content of the conversion tem-perature was 20％～24％,the temperature rise was 5-15 ℃,and the tempering ratio was 2∶1-4∶1.The optimum process parameter combination of variable temperature drying was the initial temperature of 50.59 ℃,the moisture content of the conversion temperature of 22.86％,the temperature rise of 5 ℃,and the tempering ratio of 3.8∶1.0.After drying,the crack growth rate of corn was 10.00％,the color difference value was 2.056,and the relative error between the experimental value and the predicted value was 4.25％.
maizevariable temperature dryingdrying characteristicsoptimization of process parameters
NETL
NSTL
万方数据
