NOVELTY - Thermal drying of solid-liquid- mixed systems, using a dryer (4) that is partially connected with a jet compressor (3), comprises (i) directly contacting a dry material with hot plates, which are heated by heating coils, (ii) absorbing an emerging vapor by an inlet of the jet compressor, and (iii) condensing in a diffuser, and heating at an evaporation temperature such that the condensed vapor is condensed in a heating coil, and transfers its condensed heat to the dry material, and the condensed vapor present as a washing liquid, accommodates ingredients emerged from the dry material.    USE - The method is useful for thermal drying of solid-liquid- mixed systems made of finely divided solids and liquids with large intermolecular interactions comprising sewage- and filter sludge, molecular disperse mixed systems, fine dispersions, and digestate from biogas plants.    ADVANTAGE - The method is carried out in a reduced pressure and is environmentally friendly. The plant is constructed with the pipelines having thermal insulation, thus it avoid heat losses.    DETAILED DESCRIPTION - Thermal drying of solid-liquid- mixed systems made of finely divided solids and liquids with large intermolecular interactions comprising sewage- and filter sludge, molecular disperse mixed systems, fine dispersions, and digestate from biogas plants, using a dryer (4) that is partially connected with a jet compressor (3), comprises (i) directly contacting a dry material with hot plates, which are heated by heating coils, (ii) absorbing an emerging vapor by an inlet of the jet compressor, and (iii) condensing in a diffuser, and heating at an evaporation temperature such that the condensed vapor is condensed in a heating coil, and transfers its condensed heat to the dry material, and the condensed vapor present as a washing liquid, accommodates ingredients emerged from the dry material. An INDEPENDENT CLAIM is also included for a plant for the thermal drying of solid-liquid mixed systems, comprising a first heating circuit with at least one evaporator unit (2), the jet compressor, the dryer with at least one heating element, and connected with the inlet of the jet compressor, where the heating coil is heated from a motive steam mixed with absorbed vapors, which was previously condensed in the diffuser of the jet compressor, and a second heating circuit containing a heat exchanger, a feed pump (5), an additional heat source in the form of a gas boiler, and the heating element. The heating circuits are extended by at least one low-pressure expansion device.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the plant for thermal drying.    Thermal power station (1)    Evaporator unit (2)    Jet compressor (3)    Dryer (4)    Feed pump (5)