Pattern of Nitrogen Migration in a Modified Atmosphere Environment for Wheat Storage
Article
Figures
Metrics
Preview PDF
Reference
Related
Cited by
Materials
Abstract:
The experiment was carried out in a simulated pilot warehouse (length 9 m, width 6 m, height 9 m). The designed grain-piling line was 6 m, and the actual height of the wheat was 5.7 m. Nitrogen was constantly purged into the warehouse at a flow rate of 30 m3/h. The storage conditions were monitored every 18 min by an intelligent terminal system, and nitrogen purging was stopped when the concentration at each point reached the highest level and was stable. The results showed that the nitrogen migration speeds in the warehouse measured at points symmetrical to the air supply inlet were almost the same, so the nitrogen migration speeds in different directions were compared by setting points evenly. In the horizontal direction, the further the measurement point was from the air supply inlet, the slower the nitrogen migration speed became. In the vertical direction, the further the measurement point was from the air supply inlet, the slower the increase in nitrogen concentration; the closer the points were to the air supply inlet, the more significant the difference in nitrogen concentration between points, and the further the points were, the more similar the changes in nitrogen concentration between points. The time and nitrogen concentration at each point showed a significant positive correlation (p<0.01). The closer two measurement points were, the stronger the correlation. With increasing distance between the measurement points, the correlation coefficient became smaller, indicating that nitrogen migration proceeded in layers, and neighboring points had a relatively greater impact. Analysis of the change in nitrogen concentration at vertical and horizontal points at the same distance showed that changes in the vertical direction were faster than those in the horizontal direction at a significance level of p=0.02.
