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SIMULATION FOR PROCESSING OF AGRICULTURAL PRODUCTS USING PHYSICAL CHEMISTRY

利用物理化学模拟农产品加工

基本信息

批准号：
07456114
负责人：
UCHINO Toshitaka
金额：
$ 4.67万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

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.

首先，从理论上研究了纯冰作为农产品简单替代品的微波消解特性。用边界固定法对所构造的方程进行了数值分析。此外，作为介电加热的另一应用，进行微波干燥试验。利用传热学理论和热平衡原理建立了干燥和加热方程。其次，建立了精米深床吸附过程中温度和含水率的预测模型。不同层位的温度和湿度预测值与实测值吻合较好。另外，针对传统干燥理论存在的问题，引入了吸附剂混贮干燥理论。该理论考虑了吸附剂与谷物之间的空隙中滞留的水蒸气使平衡含水率升高的因素。第三，对甘薯进行了干燥试验，研究了甘薯的干燥特性。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、二降速干燥期的干燥常数具有Arrehenius型温度变化趋势。并进行了稻谷减压加热干燥试验，建立了稻谷减压加热干燥系统的模拟理论。通过计算值与实测值的比较，证实了理论的正确性。此外，还尝试计算了空气在小麦包装床中的流动阻力随含水率的变化规律，并精确测定了谷物的呼吸速率，提出了描述呼吸速率的经验公式。此外，利用呼吸速率与氧气和二氧化碳气体浓度的函数关系式，预测了MA瓦楞纸箱包装西兰花中气体浓度的变化。