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在试验研究早、中、晚 6品种稻谷吸附特性数据的基础上 ,用物理化学理论建立的稻谷对水分吸附的热力学参数 ,分析了稻谷的吸附特性。结果表明 :稻谷的吸附热与aw(水分活度 )相关 ,aw 小 ,吸附热值大 ;aw 大 ,吸附热值小。吸附热反映了稻谷表面与水蒸汽分子之间作用力性质。稻谷的结合能与稻谷温度、含水量、水分活度有关 ,温度高 ,结合能高 ;水分活度高 ,结合能就低 ;稻谷的含水量大 ,结合能也就低 ,反之 ,则高。稻谷的水传递势随稻谷含水量增加而增加 ,温度升高 ,质传递势增加。通过吸附性能参数为定量分析稻谷等温吸湿性物料吸附与干燥性能提供了理论依据
Based on the experimental data on the characteristics of paddy characteristics of early, middle and late six varieties of rice, the adsorption characteristics of paddy on the thermodynamic parameters of moisture adsorption established by the physico-chemical theory were analyzed. The results showed that: the adsorption heat of rice is related to aw (water activity), aw is small, and the adsorption calorific value is large; aw is large and the adsorption calorific value is small. The heat of adsorption reflects the nature of the force between the rice surface and the water vapor molecule. The combination of rice and rice temperature, water content, water activity, high temperature, high binding energy; water activity is high, the binding energy is low; rice moisture content, binding energy is low, on the contrary, is high. The water transfer potential of paddy increased with the increase of paddy water content. The temperature increased and the mass transfer potential increased. Adsorption performance parameters provide a theoretical basis for the quantitative analysis of adsorption and drying properties of paddy isothermal hygroscopic materials