The physical properties of parallel flow drying and the corresponding negative properties such as the higher exhaust gas temperature compared to the product temperature as well as the resulting high emission values and the increased energy consumption have prompted us to take a completely new approach.
Heating recycling material in counterflow
The recycling material is now heated in counterflow. That means that the material flows against the heat source in the drum. This achieves higher material temperatures while lowering the exhaust gas temperature. The outflow temperature of 160 °C corresponds to the further processing temperature while the exhaust temperature is above the dew point at about 100 °C.
Positive effect for the virgin material: The material no longer has to be run overheated, which results in a clear energy reduction. The entire process is only possible with the use of a hot-gas generator as direct firing would burn the recycling material and make it unusable. Burner, hot-gas generator, dryer drum, separator cover and circulating air system are precisely balanced.