sawdust alfalfa palm fiber

1.8*20m indirect dryer for forage, sawdust, alfalfa, palm fiber, etc
1. How does work?
The heating medium doesn’t touch the materials directly. All the heat is transferred by wall. Inside the rotating cylinder, there is a concentric cylinder in which materials move forward. Flue gas enters the ringlike space between the shell and wall of inside cylinder, then enters the concentric cylinder through connecting pipe. Also, there is a different trend of flue gas. Concentric cylinder first, then the ringlike space where materials go forward. To discharge the moisture released from the materials, moderate air draught by fan is necessary. However, the amount would be greatly less compared with the direct. Because the air speed is slow(generally 0.3-0.7m/s), exhaust gas brings litter dust. Gas solid separation equipment is barely needed. On many occasion, we can also adopt natural ventilation to exhaust the moisture.
2. What is the application of ?
Indirect dryer is usually to dry inflammable materials, such as wood chips, forage, sawdust, cassava dregs etc. Due to its unique design, materials couldn't get touch with open fire. So, it would be much more safe.