|
| Temperature field of soybean grain pile in reinforced concrete shallow round silo |
| |
| DOI： |
| KeyWord:shallow round silo mechanical ventilation numerical simulation temperature field |
| FundProject:河南省高等学校重点科研项目（22B560020） |
|
| Hits: 2089 |
| Download times: 2003 |
| Abstract: |
| In order to study the temperature change of soybean in the process of mechanical ventilation, a reinforced concrete shallow round silo with a inside diameter of 30 m and a grain loading height of 20 m in North China was taken as the research object, and based on the theory of heat and mass transfer in porous media, the numerical simulation software COMSOL was used to establish numerical model of temperature changes inside grain pile during soybean storage. The model was used to analyze the temperature field of soybean grain pile in shallow round silo in the process of mechanical ventilation, and the temperature change process of the grain pile under the conditions of different initial grain temperature and grain loading height were predicted. The results showed that the temperature of the grain layer changed from violent to slow with the increase of the distance from the air duct. The existence of the thermal resistance of the grain pile led to a certain hysteresis in the heat transfer process of the whole grain pile, so that the temperature distribution of the whole grain pile was uneven. When the initial grain temperature was 12,14,16,18,20 ℃, after 86 h of mechanical ventilation,the temperature of the grain piles in the silo dropped to 4.9, 6.2, 7.3, 8.4 ℃ and 9.6 ℃,and decreased by 59%, 56%, 54%, 53% and 52% respectively. Under the same boundary conditions, the grain temperature with the lower initial temperature had a larger drop in grain temperature.During the mechanical ventilation process, the grain temperature change difference at different grain loading heights (18, 19 m and 20 m) showed a trend of first increasing and then decreasing. After the mechanical ventilation for 19 h and 110 h, the temperature difference between the grain piles was 0.1 ℃ and 0.6 ℃ when the height difference between the grain loading was 1 m; after the mechanical ventilation, the temperatures of the grain piles in the silo were 0.3, 0.5 ℃ and 0.9 ℃ respectively, and when the height difference of grain loading was 1 m, the temperature difference between the grain piles was 0.2-0.4 ℃. In conclusion, the established model can predict the temperature field of soybean grain pile in reinforced concrete shallow round silo with various initial boundary conditions. |
| View full text View/Add Comment Download reader |
| Close |
|
|
|
