摘要
为掌握除湿过程湿度场分布及作用于种子含水率的规律,针对压差原理的贮藏箱体,以水稻种子为试验物料,基于COMSOL Multiphysics5.0软件,对不同湿度环境湿度场分布和不同包装种子在不同湿度场中随时间变化的种子含水率进行数值模拟,得出了不同包装种子在不同湿度环境下贮藏7天的种子含水率与湿度场云图。研究结果表明:同一包装的水稻种子在不同湿度环境下具有不同的吸湿或解吸速率。95%高湿环境下散装的种子平均吸水速率可达1.79×10^(-2)mol/d,用铝箔袋包装平均吸湿速率仅有0.2×10^(-2)mol/d,是散装包装的1/9;35%超干燥环境下散装的种子平均解吸速率可达0.68×10^(-2)mol/d,贮运7天后含水率可降到9%;5 0%湿度环境下贮运7天后含水率可达到11%,但前者能耗是后者能耗的4倍多。通过与验证试验对比,试验结果与模拟结果基本吻合,试验值与模拟值最大偏差值为1.2%,该模型是有效的。
In order to obtain the distribution of humidity field and the rule of seed moisture content,a transport container for storage with dehumidifier based on differential pressure principle was investigated. In this study,rice seeds were used as the test material. It was used the Finite Element analysis software COMSOL Multi-physics 5. 0,The humidity field of different humidity environment and seed moisture content of different packing seeds in different humidity field were simulated. The seed moisture content and the humidity field cloud charts of different packing seeds were obtained under different humidity environment for 7 days. The results showed that the rice seeds with the same package had different moisture absorption and desorption rates under different humidity conditions. The average bibulous rate of seeds in unpacked in 95% high humidity environment could be achieved1. 79 × 10^-2 mol/d,The average bibulous rate of seed in aluminum foil packing only 0. 2 × 10^-2 mol/d,Which was one ninth of the former. The average water loss rate of seeds in unpacked in 35% dry environment could be achieved 0. 68 × 10^-2 mol/d. The rice seeds moisture content in unpacked could be reduced to 9% after 7 days storage and transportation. And the rice seeds moisture content in unpacked could be up to 11% in 50% humidity environment after 7 days. However,Energy consumption of the former was more than four times the energy consumption of the latter. The test results and the simulation results was consistent. The maximum deviation value of simulation and test values is only 1. 2%. This model is valid. There is a certain reference value to design warehouse dehumidification system and select the packaging way.
作者
段洁利
吕恩利
邱汉
张馨予
赵文锋
刘伟
陆华忠
Duan Jieli;Lti Enli;Qiu Han;Zhang Xinyu;Zhao Wenfeng;Liu Wei;Lu Huazhong(South China Agricultural University Engineering Fundamental Teaching and Training Center;College of Engineering;College of Electronic Engineering, Guangzhou 510642, China;Guangdong Academy of Agricultural Sciences, Guangzhou 510642, China)
出处
《农机化研究》
北大核心
2018年第12期150-156,共7页
Journal of Agricultural Mechanization Research
基金
"十二五"国家科技支撑计划项目(2015BAD18B0301)
广东省高等学校优秀青年教师培养计划项目(Y92014025)
关键词
湿度场
种子含水率
仿真
除湿
humidity field
seed moisture content
simulation
dehumidification
