内衬塑料地下粮食筒仓粮堆温度场研究  

Study on temperature field of grain piles in underground grain silos lined with plastic

作　　者：张祥祥 张昊[1] 王振清[1] 陈曦[1] 陈雁[1] Zhang Xiangxiang;Zhang Hao;Wang Zhenqing;Chen Xi;Chen Yan(College of Civil Engineering,Henan University of Technology,Zhengzhou 450001,China)

机构地区：[1]河南工业大学土木工程学院,郑州450001

出　　处：《农业工程学报》2021年第16期8-14,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：河南省科技攻关项目(202102110122);省属高校基本科研业务费专项资金项目(2016QNJH23);河南工业大学高层次人才科研启动基金项目(2018BS077)。

摘　　要：为了研究地下仓储粮期间粮堆的温度变化,该研究以湿基含水率为23%的高水分玉米为研究对象,首先采用试验方法对内径3 m,高5 m的地下筒仓在静态储藏条件下的仓内温度场的变化进行了分析。然后基于多孔介质传热理论,使用多物理场数值模拟软件COMSOL对试验仓进行了模拟研究。数值模拟基于实际堆粮高度,充分考虑了仓内谷物颗粒呼吸作用对粮堆内温度场分布的影响,研究了不同初始粮温、粮食种类和装粮季节对仓内温度场的影响。结果表明:静态储藏阶段,粮食的呼吸作用较强,粮堆首先在底部开始升温,并逐渐形成高温热芯,随后热芯位置逐渐向粮堆中上部移动,并最终稳定于距装粮线1 m处。初始粮温为35℃时,仓内粮堆温升最高,为6.1℃,温度达到峰值后出现下降趋势;在5种不同种类(玉米、油菜籽、大豆、小麦和稻谷)粮堆中,油菜籽堆平均温升最高,为1.6℃,玉米堆平均温升最低,为1.2℃;不同季节外部环境温度的变化对仓内粮堆温度变化影响很小,仓内粮堆温度在不同季节条件下表现出一致的变化趋势。该研究对地下仓高水分粮储藏期间的温度变化进行了研究,并拓展了数值模拟,可为实际工程提供参考。This study aims to explore the temperature changes of grain piles in underground grain silos during storage.The research object was taken as a corn grain pile with 23%high moisture content and a weight of 15 tons,while the underground grain silo with an inner diameter of 3m and a height of 5 m.Firstly,the change of temperature field was analyzed experimentally under static storage conditions.Secondly,the multi-physics software COMSOL was selected to simulate the grain bins with the same size,boundary conditions and height using the theory of heat transfer in porous media.The actual pile height was also utilized to fully consider the influence of grain respiration on the distribution of temperature field in the pile during simulation.A comparison between numerical simulation and experimental data was made to investigate the influence of different initial grain temperatures,grain types and loading seasons on the temperature field in the warehouse.The results show that the grain respiration was strong during the static storage stage.Specifically,the grain pile started to heat up at the bottom,and gradually formed a high-temperature heat core with 22.5℃locating on the place,where was 1m radial and 2m axial from the physical core.Then,the position of heat core moved gradually to the middle and upper part of grain pile,and finally stabilized at the place where was 1m below the grain loading line,resulting in the obvious stratification in the temperature of grain pile.Furthermore,the spatial domain of air temperature descended from 15.1 to 12.2℃in the bin at ambient temperature.The temperature changes of grain layers in the whole experiment chamber were almost unaffected by the air domain temperature,except the fourth layer of grain stack.More importantly,there was a great increase in the temperature of grain pile under various initial grain temperature(5,15,25 and 35℃).Specifically,the final temperatures of grain pile in the silo were 9.5 and 16.8℃,with an temperature increase of 4.5℃and 1.8℃,when the initi

关 键 词：作物 温度场 温度传感器 地下粮食筒仓 玉米 静态储藏 数值模拟 

分 类 号：TS210[轻工技术与工程—粮食、油脂及植物蛋白工程]