横向与竖向通风玉米粮层阻力研究
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摘要
利用180 t模拟试验仓测试了横向、下行吸出式、上行压入式竖向通风的玉米粮堆的粮层阻力。结果表明:在0.021~0.06 m~3/(s·m~2)的单位面积通风量之间,横向通风单位粮层阻力为9.74~28.95 Pa/m,两者关系模型为Y=528x1.032 2(R2=0.998 2),或,Y=-954.15x2+561.78x-1.648(R2=0.999 2)。在0.004 5~0.089 5 m3/(s·m~2)的单位面积通风量之间,下行吸出式竖向通风单位粮层阻力为4.0~85.0 Pa/m;上行压入式竖向通风单位粮层阻力为3.8~70 Pa/m,两者关系模型与横向相近,但系数远大于横向。比较发现:横向通风玉米单位粮层阻力最小,比竖向通风小一倍左右,表明由玉米粮粒组成的多孔介质堆具有各向异性的特点;下行吸出式竖向通风的粮层阻力稍大于上行压入式的粮层阻力;研究结果进一步完善了储粮通风理论,储粮通风系统工程设计和建设方面具有实际应用价值。
The resistance of grain layer was measured for the corn mass in vertical ventilation( VV) with horizontal ventilation( HV),downward suction( DS) and upward pressing( UP). The results indicated that the unit grain layer resistance( UGLR) in the horizontal ventilation was 9. 74 ~ 28. 95 Pa/m between 0. 021 to 0. 06 m3/( s·m~2) of air flow sensor( AFS). And UGLR and AFS had the relationship models of Y = 528x1. 032 2( R2= 0. 998 2) or Y =-954. 15x2+ 561. 78x-1. 648( R2= 0. 999 2). In HV. UGLR of DS and UP of VV were 4. 0 ~ 85. 0 Pa/m and3. 8~ 70 Pa/m between 0. 004 5 and 0. 089 5 m3/( s·m~2) of AFS,respectively. The relationship models of UGLR and AFS in DS and UP of VV were similar to the horizontal model,but the coefficient of them was more than the horizontal model. By comparing,UGLR of HV was the minimum one,which was less one time than UGLR of VV. The porous media mass of corn composed by grains had a characteristic of anisotropy; UGLR of DS was slightly higher than that of UP. The results further perfected the theory of ventilation for stored grains which had practical applications in design and building of ventilation system for stored grains.
The resistance of grain layer was measured for the corn mass in vertical ventilation( VV) with horizontal ventilation( HV),downward suction( DS) and upward pressing( UP). The results indicated that the unit grain layer resistance( UGLR) in the horizontal ventilation was 9. 74 ~ 28. 95 Pa/m between 0. 021 to 0. 06 m3/( s·m~2) of air flow sensor( AFS). And UGLR and AFS had the relationship models of Y = 528x1. 032 2( R2= 0. 998 2) or Y =-954. 15x2+ 561. 78x-1. 648( R2= 0. 999 2). In HV. UGLR of DS and UP of VV were 4. 0 ~ 85. 0 Pa/m and3. 8~ 70 Pa/m between 0. 004 5 and 0. 089 5 m3/( s·m~2) of AFS,respectively. The relationship models of UGLR and AFS in DS and UP of VV were similar to the horizontal model,but the coefficient of them was more than the horizontal model. By comparing,UGLR of HV was the minimum one,which was less one time than UGLR of VV. The porous media mass of corn composed by grains had a characteristic of anisotropy; UGLR of DS was slightly higher than that of UP. The results further perfected the theory of ventilation for stored grains which had practical applications in design and building of ventilation system for stored grains.
引文
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[2]杨进,杨国锋,黄祖申.粮层深度与粮层阻力关系的试验分析[J].中国粮油学报,2001,16(2):47-49Yang Jin,Yang Guofeng,Huang Zushen.Experimental analysis of the relationship between grain depth and grain resistance[J].Journal of the Chinese Cereals and Oils Association,2001,16(2):47-49
[3]杨英强,俞忠.粮食物性和粮层阻力实验研究[J].实验室研究与探索,2008,27(8):32-34Yang Yingqiang,Yu Zhong.Experimental research on grain characteristics and resistance of grain layer[J].Research and Exploration in Laboratory,2008,27(8):32-34
[4]LS/T 1202-2002.储粮技术规程.储粮机械通风技术规程[S]LS/T 1202-2002.Technical regulation of aeration for grain storage[S]
[5]曹阳,魏雷,赵小津,等.粮仓横向通风方法及其系统[P].2009Cao Yang,Wei Lei,Zhao Xiaojin,et al.Method and system for horizontal ventilation of warehouse[P].2009
[6]王平,周焰,曹阳,等.平房仓横向通风降温技术研究[J].粮油仓储科技通讯,2011(2):19-23Wang Ping,Zhou Yan,Cao Yang,et al.Study on horizontal ventilation cooling technology in warehouse[J].Grain and Oil Storage Science and Technology Communication,2011(2):19-23
[7]徐敏钊,翟纪忠,邢衡建.离心风机双向通风保水降温试验[J],粮食加工,2011,36(3):71-72Xu Mingzhao,Zhai Jizhong,Xing Hengjian.Keep water and cooling experiment of centrifugal fan with bidirectional ventilation[J].Grain Processing,2011,36(3):71-72
[8]沈天翔.低温储粮技术应用:2012.http://www.doc88.com/p-879103705448.html Shen Tianxiang.Application of low temperature storage technology.2012.http://www.doc88.com/p-879103705448.html
[9]Shlomo Navarro,Ronald Noyes.The mechanics and physics of modern grain aeration management[M].Boca Raton:CRC Press LLC,2002:209-210
[10]刘伟,范爱武,黄晓明.多孔介质传热传质理论与应用[M].北京:科学出版社.2006:7-8,31Liu Wei,Fan Aiwu,Huang Xiaoming.Theory and application of heat and mass transfer in porous media[M].Beijing:Science Press.2006:7-8,31
[11]吴子丹.绿色生态低碳储粮新技术[M].北京:中国科学技术出版社,2011:150-183Wu Zidan.Geen ecological technology for grain storage[M].Beijing:Science and Technology of China Press,2011:150-183
[12]粮食储运国家工程实验室.粮食储藏“四合一”升级新技术概述[J].粮油食品科技,2014,22(6):1-5National Engineering Laboratory-Grain Storage&Logistics.An overview of the new technology of four in one upgrade for grain storage[J].Science and Technology of Cereals,Oils and Foods,2014,22(6):1-5
[13]国家粮食局科学研究院.粮食“四合一”储藏技术升级背景与应用效果[J].粮油食品科技,2015,S1:1-2Academy of State Administration of Grain.Upgrade background and application effects on technology of four in one for grain storage[J].Science and Technology of Cereals,Oils and Foods,2015,S1:1-2
[14]赵会义,张宏宇,李福君,等.我国储粮机械通风技术发展[J].粮油食品科技.2015,S1:3-10Zhao Huiyi,Zhang Hongyu,Li Fujun,et al.Development of mechanical ventilation in China[J].Science and Technology of Cereals,Oils and Foods,2015,S1:3-10.