In recent years, various new types of grain storage equipment have been emerging one after another. However, Axial-flow fan It is favored by most storage units due to its high airflow and low energy consumption, and has been widely adopted, especially in tall warehouses. Now, let’s discuss the specific functional applications of axial-flow fans when used in grain storage.

Application of Axial Fans in Flat-Rack Warehouses

   No.1 Air separation for impurity removal

   Due to the varying proportions of particles and light impurities, a mobile axial-flow fan is used for cleaning. The history of purging and removing impurities can be said to be quite long, with numerous methods and approaches available. Simply install an axial-flow fan at the unloading position of the conveyor belt. By adjusting the distance between the moving axial-flow fan and the material, the airflow can be effectively regulated to achieve the purpose of removing debris. The advantages of this method are: it saves effort, conserves energy, and does not affect the continuity of operations. The downside is that there’s a lot of dust.

  No.2 Balance the chamber temperature and reduce the transfer of heat and moisture.

   After the new grain is stored in the warehouse, the surface of the grain should be leveled promptly, and temperature-measuring cables should be buried underground during the normal storage phase. Ventilation is crucial before sealing off the entire warehouse for two reasons:

  1. Grain-layer temperature difference: Large warehouses have high storage capacity and long storage durations. Different batches of grain exhibit varying temperatures, resulting in temperature differences.

  2. Grain moisture levels: Although grains from the same batch stored in the same warehouse and of the same variety, differ in terms of origin, storage duration, moisture content, impurities, and other factors. Moreover, prolonged storage periods, combined with the presence of heat and moisture within grain piles in warehouses, can lead to accumulation phenomena—issues that pose certain risks to storage operations.

   Generally speaking, the ventilation requirements and technical parameters for this period should comply with the requirements of the "Technical Specifications for Grain and Oil Storage." It is recommended to use grain coolers for initial cooling. To save costs, if low-temperature storage is not required, axial-flow fans can also be used for ventilation. This approach is both simple and convenient, but it places relatively strict demands on ventilation duration and atmospheric parameters.

   During this period, short-term ventilation can achieve two objectives: one is to balance the temperature and humidity within the warehouse, which can effectively prevent localized condensation and overheating, thus setting a solid foundation for the next stage of storage. The second is to promptly locate the grains in the pile. After the issue is resolved, a microcomputer can be used to promptly detect high-temperature points and carry out timely inspections and repairs, thereby preventing potential hazards.

  No.3 Lower warehouse temperatures and fumigate during the summer.

  1. Lower the warehouse temperature in summer.

   As summer temperatures rise, grain temperatures will also gradually increase. Most heat exchange occurs through the roof, doors and windows—especially the roof. If there are no conditions to improve the silo roof, you can use axial fans at appropriate times during summer nights (relatively speaking) when temperatures are lower. The steps are divided into two: First, turn on the roof fan to dissipate the accumulated heat onto the roof. The second method is to open the warehouse’s fans and work doors to dissipate the heat that has accumulated in the warehouse. Practice has proven that this method can reduce warehouse temperature by approximately... 5 ° C and delay the rise in grain temperature.

  2. Fumigation and ventilation

   After fumigation is completed, toxic gases in the warehouse should be promptly removed. Combined with natural ventilation, this can shorten the degassing period and facilitate inspection work by warehouse personnel.