糜子籽粒双向通风干燥特性及数学模型研究

Study on bidirectional ventilation drying characteristics and mathematical model of grain in broomcorn millet

以糜子籽粒为原料,运用双向通风谷物干燥实验台对糜子籽粒进行干燥试验,研究糜子籽粒在不同热风温度、热风风速和物料厚度条件下含水率的变化过程,分析各因素对糜子籽粒干燥速率的影响,探究干燥特性与各因素之间的变化关系,建立糜子籽粒双向通风干燥的数学模型。结果表明:热风温度对糜子籽粒干燥速率影响较大,热风风速次之。当热风温度60℃、热风风速4 m/s、物料厚度20 mm时,糜子籽粒双向通风干燥速率最快,建立的基于Page方程的糜子籽粒双向通风干燥数学模型拟合效果较好。

The drying experiment of grain in broomcorn millet was carried out with bidirectional ventilation grain drying test-bed.The changing process of moisture content of grain in broomcorn millet under different hot air temperature,hot air velocity and material thickness was studied.The effects of various factors on the drying rate of millet grain were analyzed,and the relationship between drying characteristics and various factors was explored.The mathematical model of bidirectional ventilation and drying of millet seeds was established.The results showed that the hot air temperature had a great influence on the drying rate,followed by the hot air speed.The optimum drying process with the quickest bidirectional ventilation drying rate was obtained when the temperature of hot air was 60℃,the velocity of hot air was 4 m/s and the thickness of material was 20 mm.The mathematical model of bidirectional ventilation drying of grain in broomcorn millet was established based on Page equation.The model was validated and the results showed that the fitting effect of the model was better.