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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、通风上限温度线组成窗口,当大气状态点位于这个窗口内,轴流风机被启动运转,粮堆降温通风开始。当大气状态点位于这个窗口外,轴流风机被停止,粮堆降温通风结束。本研究在2016年12月27日至2017年1月16日期间,在山东齐河军粮库7号房式仓(小麦3 089 t,水分12.0%),采用2台0.85 kW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 kW·h,单位能耗0.0159 kW·h·(t~(-1))·(℃~(-1)),节省电能60%。通风前后粮堆平均含水率和裂纹破碎率保持不变。
In the computer display system, the ventilation window is made up of the absolute humidity curve of adsorption equilibrium of wheat, the absolute humidity curve of saturation, and the upper temperature limit line of ventilation. When the atmospheric state point is located in this window, the axial fan is started and cooling of the grain pile begins. When the atmospheric state point is outside this window, the axial fans are stopped and the cooling of the grain pans ends. In this study, two sets of 0.85 kW axial fans were used to ascend from December 27, 2016 to January 16, 2017 in the warehouse of No. 7 in Qihejun Grain Depot in Shandong (3 089 t of wheat and 12.0% of water) The average grain temperature decreased by 9.2 ℃, the fan operation was 265.5 h, the power consumption was 451.4 kW · h and the unit energy consumption was 0.0159 kW · h · (t -1) · (℃ -1), saving Electricity 60%. Before and after ventilation, the average grain moisture content and crack breaking rate remained unchanged.