This demonstration will take place in the pet food producing industry and will be installed in the production and drying of kibble or dried fodder. The useful supply temperature of the novel heat pump system will be around 150 to 180 °C, the heating capacity will be around 500 kW.
Kibbles (raw material) from the extruder are fed into the drying chamber and transported through a superheated steam atmosphere by belts. The drying chamber is open at the bottom and steam pressure is, therefore, close to ambient pressure. The product is dried due to the superheat of the steam and additional vapor is hereby produced. The steam in the drying chamber is cooled down from around 150-180 °C (inlet) to 110 °C (outlet) during drying, but the superheated condition is sustained (no condensation). The dryer is a prototype with a capacity of 500 kW. For full-scale industrial application the system must be up-scaled to a capacity of 1200 kW. The specific energy consumption of the current system is between 800 and 900 kWh per ton of removed water.