High moisture content wheat kernels are subject to elevated respiration rates due to enzyme activity and mould growth that reduce the dry grain and may produce suffi-cient energy which may be harmful to wheat quality....High moisture content wheat kernels are subject to elevated respiration rates due to enzyme activity and mould growth that reduce the dry grain and may produce suffi-cient energy which may be harmful to wheat quality.Grain aeration provides a powerful nonchemical stored grain insect management.Currently,aeration is a suitable and economical device to overcome this problem.The moisture management is vital to prevent spoilage in stored grain.The objective of this study is to investigate the influence of using low relative humidity(RH)aeration on the wheat moisture content.The numerical investigation based on heat and mass balances is developed and used to simulate the evolution of grain temperature and moisture under various air RH in a wheat storage silo.Results show that the dehumidification of blown air had greater potential for decreasing RH of interstitial air and wheat moisture at 30◦C temperature and RH of 40%,50%and 60%.展开更多
本研究对14个小麦品种在5个温度(10、20、25、30、35℃)和RH 11.3%~96%范围内进行测定,并采用CAE方程进行拟合,决定系数(R2)>0.998,平均相对百分率误差(MRE)<2.951%。对于小麦解吸和吸附等温线,CAE方程拟合的5个参数中B1和B2差异...本研究对14个小麦品种在5个温度(10、20、25、30、35℃)和RH 11.3%~96%范围内进行测定,并采用CAE方程进行拟合,决定系数(R2)>0.998,平均相对百分率误差(MRE)<2.951%。对于小麦解吸和吸附等温线,CAE方程拟合的5个参数中B1和B2差异显著,不同类型小麦之间对应的CAE方程系数是相似的。不同类型的小麦品种收获后可以同时处理,但其吸附和解吸行为应当分别对待。智能化粮情检测、通风窗口控制、小麦CAE平衡水分方程组成控制系统指定仓库通风。在计算机显示系统,通风窗口由小麦吸附平衡绝对湿度曲线、饱和绝对湿度曲线、通风上限温度(通风开始时为粮堆温度减去8℃,通风进行时为粮堆温度减去4℃)线组成窗口,当大气状态点位于这个窗口内,轴流小风机被启动运转,粮堆降温通风开始。当大气状态点位于这个窗口外,轴流小风机被停止,粮堆降温通风结束。在2015年12月16日—28日,这个系统用于河北清苑国家粮食储备库14号房式仓(小麦5 900 t,含水量11.5%),下行吸出式通风降温7.4℃,3台1.5 k W轴流风机运转累计用电800 k W,单位能耗0.018 k Wh t-1℃-1,节省电能55%。14号整仓裂纹破碎率均值为(3.66±0.22)%,显著低于使用4台5.5 k W离心风机的10号仓(4.30±0.28)%。2016年12月27日—2017年1月16日在山东齐河军粮库7号房式仓(小麦3089 t,含水量12.5%),采用2台0.85 k W轴流风机上行吸出式通风,平均粮温下降9.2℃,风机运转265.5 h,用电451.4 k Wh,单位能耗0.015 9 k Wh t-1℃-1,节省电能60%。展开更多
基金The Research Program of Tunisian Ministry of High Education and Scientific Research supported this study(Tunisian PRF Projects:PRF11ANME-01ER).
文摘High moisture content wheat kernels are subject to elevated respiration rates due to enzyme activity and mould growth that reduce the dry grain and may produce suffi-cient energy which may be harmful to wheat quality.Grain aeration provides a powerful nonchemical stored grain insect management.Currently,aeration is a suitable and economical device to overcome this problem.The moisture management is vital to prevent spoilage in stored grain.The objective of this study is to investigate the influence of using low relative humidity(RH)aeration on the wheat moisture content.The numerical investigation based on heat and mass balances is developed and used to simulate the evolution of grain temperature and moisture under various air RH in a wheat storage silo.Results show that the dehumidification of blown air had greater potential for decreasing RH of interstitial air and wheat moisture at 30◦C temperature and RH of 40%,50%and 60%.
文摘本研究对14个小麦品种在5个温度(10、20、25、30、35℃)和RH 11.3%~96%范围内进行测定,并采用CAE方程进行拟合,决定系数(R2)>0.998,平均相对百分率误差(MRE)<2.951%。对于小麦解吸和吸附等温线,CAE方程拟合的5个参数中B1和B2差异显著,不同类型小麦之间对应的CAE方程系数是相似的。不同类型的小麦品种收获后可以同时处理,但其吸附和解吸行为应当分别对待。智能化粮情检测、通风窗口控制、小麦CAE平衡水分方程组成控制系统指定仓库通风。在计算机显示系统,通风窗口由小麦吸附平衡绝对湿度曲线、饱和绝对湿度曲线、通风上限温度(通风开始时为粮堆温度减去8℃,通风进行时为粮堆温度减去4℃)线组成窗口,当大气状态点位于这个窗口内,轴流小风机被启动运转,粮堆降温通风开始。当大气状态点位于这个窗口外,轴流小风机被停止,粮堆降温通风结束。在2015年12月16日—28日,这个系统用于河北清苑国家粮食储备库14号房式仓(小麦5 900 t,含水量11.5%),下行吸出式通风降温7.4℃,3台1.5 k W轴流风机运转累计用电800 k W,单位能耗0.018 k Wh t-1℃-1,节省电能55%。14号整仓裂纹破碎率均值为(3.66±0.22)%,显著低于使用4台5.5 k W离心风机的10号仓(4.30±0.28)%。2016年12月27日—2017年1月16日在山东齐河军粮库7号房式仓(小麦3089 t,含水量12.5%),采用2台0.85 k W轴流风机上行吸出式通风,平均粮温下降9.2℃,风机运转265.5 h,用电451.4 k Wh,单位能耗0.015 9 k Wh t-1℃-1,节省电能60%。
