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本实验在长9 m,宽6 m,高9 m的模拟中试仓,设计装粮线6.0 m,实储小麦高度5.7 m,N_2流量为30 L/m~3,恒定通入仓内。粮情测控智能终端测定18 min/次,当各点N_2浓度最高且持续稳定,停止向仓内通入N_2。结果表明:通过从离送气口的对称点位测得N_2在仓内传递速度均匀,因此可以均匀布点进行。水平方向距离送气口越远,N_2传递速度越慢。垂直方向距离越远,N_2浓度上升的越慢;离送气口越近,点之间N_2浓度差越大;离送气口越远,检测点之间浓度变化越相似。各点时间-N_2浓度均成显著正相关(p<0.01),且检测点越接近,相关性越强,随着检测点之间距离的增加,相关性系数越来越小,说明N_2逐层传递,相邻检测点之间影响较大。通过对距离相同的水平与垂直检测点N_2浓度变化的分析,由显著性p=0.02(p<0.05)得到垂直方向N_2浓度变化显著快于水平方向N_2浓度变化。
In this experiment, a simulation test warehouse of 9m in length, 6m in width and 9m in height was designed. The designed grain filling line was 6.0 m, the height of real wheat was 5.7 m and the flow of N_2 was 30 L / m ~ 3. The intelligent terminal for grain measurement and control measures 18 min / time. When the concentration of N 2 at each point is the highest and continues to be stable, stop the flow of N 2 into the storage. The results show that: N 2 can be evenly distributed to the inside of the warehouse by measuring the symmetry points from the air inlet. The farther away from the air inlet in the horizontal direction, the slower the N_2 transmission speed. The farther the distance in the vertical direction, the slower the rise of N 2 concentration. The closer to the air inlet, the larger the difference in concentration of N 2 between the spots. The farther away from the air inlet, the more similar the concentration changes between the detection points. There was a significant positive correlation between concentration of -N_2 at each time point (p <0.01), and the closer the detection point was, the stronger the correlation. With the increase of the distance between the detection points, the correlation coefficient became smaller and smaller, Pass, the greater impact between adjacent test points. Through the analysis of the change of the concentration of N 2 at the same horizontal and vertical detection points, the change of N 2 concentration in the vertical direction was significantly faster than that in the horizontal direction by significant p = 0.02 (p <0.05).