Steam turbine system for a thermal power plant, comprising - a steam turbine with a steam inlet for live steam and a steam outlet for exhaust steam, for converting energy from the steam into mechanical rotary power, and - a steam providing device (20a, 22a, 24a, 26a, 28a, 30a), which is arranged together with the steam turbine in a water-steam circuit, is connected on the one hand to the steam outlet of the steam turbine and on the other hand to the steam inlet of the steam turbine and can be supplied with thermal energy from a heat providing process of the power plant so as to produce live steam for the steam turbine from the exhaust steam of the steam turbine, wherein the steam turbine system also includes: - a reactor with a reaction chamber for the hydrothermal carbonization of biological residues, - energy transferring means (44a, 46a, 48a, 50a, 52a) for transferring thermal energy from the carbonization process into the water-steam circuit, - wherein the energy transferring means (44a, 46a, 48a, 50a, 52a) comprise at the steam providing device (20a, 22a, 24a, 26a, 28a, 30a) at least one outgoing branch, which is connected via a line to a heat exchanger, which is provided for discharging heat from the reaction chamber of the reactor and is connected via a return line to an incoming branch at a different location of the water-steam circuit, and - further energy transferring means (60a, 62a, 66a; 70a, 72a, 74a, 80a, 82a) for transferring thermal energy from the water-steam circuit into the reaction chamber of the reactor in order to initiate the carbonization process, wherein the further energy transferring means (60a, 62a, 66a; 70a, 72a, 74a, 80a, 82a) comprise at the steam turbine, in the path between the steam inlet and the steam outlet, at least one outgoing steam branch (60a; 70a, 72a) and/or at the water-steam circuit an outgoing live-steam branch, which is connected via a steam line (62a; 74a) to the reactor. - a steam turbine with a steam inlet for live steam and a steam outlet for exhaust steam, for converting energy from the steam into mechanical rotary power, and - a steam providing device (20a, 22a, 24a, 26a, 28a, 30a), which is arranged together with the steam turbine in a water-steam circuit, is connected on the one hand to the steam outlet of the steam turbine and on the other hand to the steam inlet of the steam turbine and can be supplied with thermal energy from a heat providing process of the power plant so as to produce live steam for the steam turbine from the exhaust steam of the steam turbine, - a reactor with a reaction chamber for the hydrothermal carbonization of biological residues, - energy transferring means (44a, 46a, 48a, 50a, 52a) for transferring thermal energy from the carbonization process into the water-steam circuit, - wherein the energy transferring means (44a, 46a, 48a, 50a, 52a) comprise at the steam providing device (20a, 22a, 24a, 26a, 28a, 30a) at least one outgoing branch, which is connected via a line to a heat exchanger, which is provided for discharging heat from the reaction chamber of the reactor and is connected via a return line to an incoming branch at a different location of the water-steam circuit, and - further energy transferring means (60a, 62a, 66a; 70a, 72a, 74a, 80a, 82a) for transferring thermal energy from the water-steam circuit into the reaction chamber of the reactor in order to initiate the carbonization process, wherein the further energy transferring means (60a, 62a, 66a; 70a, 72a, 74a, 80a, 82a) comprise at the steam turbine, in the path between the steam inlet and the steam outlet, at least one outgoing steam branch (60a; 70a, 72a) and/or at the water-steam circuit an outgoing live-steam branch, which is connected via a steam line (62a; 74a) to the reactor.