Drying device (1; 101; 401) for drying a product, wherein the drying device (1; 101; 401) comprises: - a housing (10; 110) having a drying chamber (11; 111) defined therein, and having a product inlet (12; 112) at a first end (13; 113) and an product outlet (14; 114) at a second end (15; 115); - a drying rotor (20; 120; 420) being arranged rotatable within the drying chamber (11; 111), wherein the drying rotor (20; 120; 420) comprises a plurality of helical grooves (21; 121; 421) arranged at the outer surface thereof and adjacent to each other; - a screw (40; 140; 200; 440) having a flight (42; 202; 441) with a flight channel there between, wherein the screw is arranged rotatable within the drying chamber and substantially parallel to the drying rotor; - a driving mechanism (45; 145) operatively connected to at least the screw, which driving mechanism is configured for driving the screw in rotation around a screw axis; and - a heater for providing thermal energy to at least a part of the drying chamber in order to dry the product present within the drying chamber, wherein the drying rotor (20; 120; 420) and/or the screw (40; 140; 200; 440) at least are configured for moving the product from the first end to the second end, wherein the screw (40; 140; 200; 440) and the drying rotor (20; 120; 420) are configured such that the flight (42; 202; 441) of the screw engages into multiple helical grooves (21; 121; 421) of the drying rotor (20; 120; 420), wherein the screw (40; 140; 200; 440) and the drying rotor (20; 120; 420) are configured such that, during use, the screw (40; 140; 200; 440) scrapes over the surface of the multiple helical grooves (21; 121; 421). - a housing (10; 110) having a drying chamber (11; 111) defined therein, and having a product inlet (12; 112) at a first end (13; 113) and an product outlet (14; 114) at a second end (15; 115); - a drying rotor (20; 120; 420) being arranged rotatable within the drying chamber (11; 111), wherein the drying rotor (20; 120; 420) comprises a plurality of helical grooves (21; 121; 421) arranged at the outer surface thereof and adjacent to each other; - a screw (40; 140; 200; 440) having a flight (42; 202; 441) with a flight channel there between, wherein the screw is arranged rotatable within the drying chamber and substantially parallel to the drying rotor; - a driving mechanism (45; 145) operatively connected to at least the screw, which driving mechanism is configured for driving the screw in rotation around a screw axis; and - a heater for providing thermal energy to at least a part of the drying chamber in order to dry the product present within the drying chamber, wherein the drying rotor (20; 120; 420) and/or the screw (40; 140; 200; 440) at least are configured for moving the product from the first end to the second end, wherein the screw (40; 140; 200; 440) and the drying rotor (20; 120; 420) are configured such that the flight (42; 202; 441) of the screw engages into multiple helical grooves (21; 121; 421) of the drying rotor (20; 120; 420), wherein the screw (40; 140; 200; 440) and the drying rotor (20; 120; 420) are configured such that, during use, the screw (40; 140; 200; 440) scrapes over the surface of the multiple helical grooves (21; 121; 421). wherein the drying rotor (20; 120; 420) and/or the screw (40; 140; 200; 440) at least are configured for moving the product from the first end to the second end, wherein the screw (40; 140; 200; 440) and the drying rotor (20; 120; 420) are configured such that the flight (42; 202; 441) of the screw engages into multiple helical grooves (21; 121; 421) of the drying rotor (20; 120; 420), wherein the screw (40; 140; 200; 440) and the drying rotor (20; 120; 420) are configured such that, during use, the screw (40; 140; 200; 440) scrapes over the surface of the multiple helical grooves (21; 121; 421).