The hot air circulation system of the Hopper Dryer plays a key role in achieving uniform drying.
To ensure uniform drying, first of all, the generation and distribution of hot air are crucial. Usually, hot air is generated by a heating device, and the hot air is evenly introduced into the hopper through reasonably designed air ducts and air outlets. The location, number and angle of the air outlets need to be carefully calculated and arranged to ensure that the hot air can fully cover the material and avoid local hot air concentration or loss.
Secondly, a good hot air circulation mode is the key. In the circulation system, a suitable fan or blower is set to promote the flow of hot air. The power, speed and blade design of the fan will affect the flow rate and pressure of the hot air, thereby affecting the flow path and distribution uniformity of the hot air in the hopper. The forced convection circulation method can enable the hot air to penetrate the material layer more effectively, reduce dead zones and temperature gradients.
Furthermore, the structural design inside the hopper also helps to achieve uniform drying. For example, setting a guide plate or a partition plate inside the hopper can guide the flow direction of the hot air, change the flow path of the hot air, and enable the hot air to contact the material more fully. At the same time, a reasonable hopper shape and size can also reduce the resistance of hot air flow and promote uniform heat exchange.
In addition, precise control of hot air temperature and humidity is also an important factor in ensuring uniform drying. The temperature and humidity of the hot air are monitored in real time by sensors and fed back to the control system, so as to adjust the heating device and dehumidification equipment to keep the hot air under suitable drying conditions. This can avoid the problem of uneven drying caused by uneven hot air temperature or humidity.
In actual operation, it is also necessary to optimize the parameters of the hot air circulation system according to the characteristics of the material and the drying requirements. For example, for materials with uneven particle size or large differences in bulk density, the flow rate and pressure of the hot air may need to be adjusted to meet different drying requirements.
For example, in a plastic granule drying application, by optimizing the hot air circulation system of the Hopper Dryer, the number of air outlets was increased and the angle was adjusted, and a guide plate was set inside the hopper so that the hot air could pass through the plastic granule layer of different bulk thicknesses evenly. In addition, through precise temperature and humidity control,
the stability of the hot air conditions during the entire drying process is ensured. Finally, the uniform drying of plastic particles was achieved, and the product quality and drying efficiency were improved.
In summary, through reasonable hot air generation and distribution, optimized circulation mode, scientific hopper internal structure design and precise temperature and humidity control, the hot air circulation system of Hopper Dryer can effectively ensure the uniform drying of materials.
