A novel method for convection drying
Methods for drying moist goods, e.g. on conveyor belts, are used in many different ways. Usually, a heated gas flows against the material to be dried. The inflow is usually perpendicular to the conveying direction. A so-called impact flow is generated. At the point of direct impact of the flow, a very fast convection drying is achieved due to a high degree of local material exchange. However, the degree of material exchange and thus the drying speed decrease rapidly as the distance from the point of impact of the flow increases. Large goods are therefore dried only very unevenly with the current impact flow method. In addition, impact flow systems usually have a high flow resistance. The energy required to generate the flow is correspondingly high. A process for convection drying that overcomes these disadvantages is desirable. Instead, there should be a higher drying speed or a more optimal degree of material transfer, and lower flow losses should also lead to a more effective use of energy.
Such a solution was recently developed at the Laboratory for Thermal and Power Engineering at FH Münster - University of Applied Sciences: The innovative process is called EnSaveDry. Compared to the conventional impact flow, EnSaveDry forms a release bubble on the conveyor belt. At the end of the release bubble, the drying gas flows turbulently over a long section of the conveyor belt. The degree of material exchange in this area is considerably better than the current state of the art. This particular method of directing the incoming flow at the drying material is furthermore associated with much lower flow losses.
- High degree of material exchange
- Resulting in high drying speed
- Lower flow losses
- Uniform drying even of large goods
- Considerable energy savings
- Lower costs for the user
- Competitive edge for the manufacturer of belt dryers
Scope of application
Initial investigations show that EnSaveDry has considerable energy-saving potential compared to the conventional impact flow method. Due to constantly rising energy prices, EnSaveDry will provide end users with high cost savings and thus a significant competitive advantage for a manufacturer of belt drying systems.
PROvendis is looking for interested companies for commercialization on behalf of FH Münster - University of Applied Sciences. A European patent application is pending.
KeywordsKonvektionstrocknung, Trocknung, feuchte Güter, Prallströmung, Trocknungsgas, Energietechnik, Wärmetechnik, Energie sparen, Förderband
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