SIMULATION FOR PROCESSING OF AGRICULTURAL PRODUCTS USING PHYSICAL CHEMISTRY

首先，从理论上研究了作为农产品简单替代品的纯冰的微波除霜特性。用边界固定法对所构造的方程进行了数值分析。此外，作为介质加热的另一种应用，还进行了微波干燥试验。利用扩散理论和热平衡原理建立了精米的干燥和加热方程。其次，建立了精米深层吸附过程中温度和水分的预测模型。不同层位温度、湿度的预测值与实测值吻合较好。此外，为了克服传统干燥理论中存在的问题，提出了一种新的吸附混合储存干燥理论。该理论考虑了颗粒与吸附剂之间空隙中的静止水蒸气上升平衡含水率的影响。再次，对甘薯进行了干燥试验，研究了其干燥特性。然后将三个干燥方程应用于观察到的干燥曲线。结果表明，第一、第二降速干燥阶段的干燥常数具有Arrehenius型温度变化趋势。在此基础上，进行了稻谷降压加热干燥试验，建立了模拟干燥系统的理论模型。通过实测值与计算值的比较，验证了理论的正确性。在此基础上，尝试计算了小麦床内气流阻力随水分含量的变化关系，并准确测量了谷物的呼吸速率，提出了描述谷物呼吸速率的经验公式。此外，还利用呼吸速率作为氧气和二氧化碳气体浓度函数的方程预测了MA瓦楞纸箱包装西兰花中气体浓度的变化。

First, the defrost characteristics of pure ice by microwave was theoretically investigated as the simple substitution of agricultural products. The constructed equations were numerically analyzed by Boundary Fixed Method. Moreover, as another application of the dielectric heating, the microwave drying test was performed. Equations for drying and heating were introduced using the deffusion theory and the heat balance.Second, a model was developed to predict the temperature and the moisture content of polished rice in deep-bed sorption. Predicted temperature and moisture were in close agreement with measured values at different layrs. In addition, a theory on the mix-storage drying with adsorbent was newly introduced to overcome the problem of the conventional one. The developed theory was taken it into considerations that the standing vapor in void space between grains and adsorbent rises equilibrium moisture content.Third, the drying test of sweet potato was performed to investigate the drying characteristics. Then three drying equations were applied to the observed drying curve. As a result, it reveals that the drying constant in the first and second falling rate drying period have Arrehenius type temperature tendency. Moreovere, the drying test of rough rice under decreased pressure with heating was carried out and the theory for simulating the drying system was developed. The theory was confirmed by comparison of observed data with the caldulated values. Furthermore, an attempt was done for the calculation of air flow resistance through packed wheat bed as the function of the moisture content.Finally, the respiration rate of grains were measured accurately and an empirical equation describing the respiration rate was proposed. In addition, the change in the gas concentration in MA corrugated cardboard box packaging broccoli was predicted by the equations regarded the respiration rate as the function of oxygen and carbon dioxide gas concentration.