Reactor facility for producing a carbon-enriched solid product by increasing a carbon content and/or by reducing an oxygen content of a carbon-containing material, having a control unit and a reactor, comprising (a) a first inlet opening for inserting the carbon-containing material, (b) at least one second inlet opening for inserting a reaction fluid, (c) a first outlet opening for removing the carbon-enriched solid product, (d) a second outlet opening for removing the reaction fluid, (e) a conveying unit for transporting the carbon-containing material from the first inlet opening to the first outlet opening, and (f) a temperature control device at least for setting or maintaining a reaction temperature in the reactor, where the reactor further is coupled to the control unit, which is designed to control the inlet and/or outlet openings (102, 105, 109, 110) and/or the temperature control device such that a temperature of between 100 °C and 450 °C and a pressure of between 1 bar and 5 bar prevail in the reactor, where reaction conditions are selected such that the reaction fluid remains gaseous during the reaction, where the conveying unit can be operated to supply the carbon-containing material continuously and to discharge the carbon-enriched solid product continuously, such that the carbon-containing material can be continuously moved through the reactor during the conversion to carbon-enriched solid product, and where furthermore a recirculation device connecting the second inlet opening and the second outlet opening is provided, using which the reaction fluid can be at least partly recirculated in order to further increase the carbon proportion of the carbon-enriched solid product by organic constituents separated out of the biomass in the recirculated reaction fluid. (a) a first inlet opening for inserting the carbon-containing material, (b) at least one second inlet opening for inserting a reaction fluid, (c) a first outlet opening for removing the carbon-enriched solid product, (d) a second outlet opening for removing the reaction fluid, (e) a conveying unit for transporting the carbon-containing material from the first inlet opening to the first outlet opening, and (f) a temperature control device at least for setting or maintaining a reaction temperature in the reactor, where the reactor further is coupled to the control unit, which is designed to control the inlet and/or outlet openings (102, 105, 109, 110) and/or the temperature control device such that a temperature of between 100 °C and 450 °C and a pressure of between 1 bar and 5 bar prevail in the reactor, where reaction conditions are selected such that the reaction fluid remains gaseous during the reaction, where the conveying unit can be operated to supply the carbon-containing material continuously and to discharge the carbon-enriched solid product continuously, such that the carbon-containing material can be continuously moved through the reactor during the conversion to carbon-enriched solid product, and where furthermore a recirculation device connecting the second inlet opening and the second outlet opening is provided, using which the reaction fluid can be at least partly recirculated in order to further increase the carbon proportion of the carbon-enriched solid product by organic constituents separated out of the biomass in the recirculated reaction fluid.