NOVELTY - The method comprises initially drying a product to be reclaimed and then thermally decomposing in a pyrolysis reactor (2) for the purpose of creating pyrolysis gas. The product is thermally dried in two drier stages arranged after one another, where the waste heat of the drier stage downstream of the product in the transport direction is used as process heat for respectively upstream drier stages. The two drier stages comprise a low temperature dryer (3) as an upstream drier stage, and a high temperature dryer (4) as downstream drier stage.    USE - Method for reclaiming biogenic mass such as sludge, plant residues, wastes and by-products of vegetable and animal origin, organic waste and waste wood.    ADVANTAGE - The method is capable of economically reclaiming the biogenic mass with high efficiency and high throughput, and prevents carbon dioxide emissions.    DETAILED DESCRIPTION - The method comprises initially drying a product to be reclaimed and then thermally decomposing in a pyrolysis reactor (2) for the purpose of creating pyrolysis gas. The product is thermally dried in two drier stages arranged after one another, where the waste heat of the drier stage downstream of the product in the transport direction is used as process heat for respectively upstream drier stages. The two drier stages comprise a low temperature dryer (3) as an upstream drier stage, and a high temperature dryer (4) as downstream drier stage. The heat of the exhaust gases of a supporting burner firing the pyrolysis reactor is used as process heat in the upstream drier stage and/or the downstream drier stage. The heat of the pyrolysis gases produced in the pyrolysis reactor is used as process heat in the upstream drier stage and/or the downstream drier stage. The pyrolysis gas of an energy conversion unit produced in the pyrolysis reactor is led for converting the energy content of the pyrolysis gases into an electrical energy. The energy conversion unit is a fuel cell, and a gas turbine (5), a combustion engine or a stirling engine. The heat of the exhaust gases of a thermal power machine connected with a generator is used as a process heat in the upstream drier stage and/or the downstream drier stage. Each of the drier stages is supplied with process heat over a self-heat carrier circuit. The waste heat of the downstream drier stage is conducted in the form of exhaust vapor by a heat exchanger integrated in the heat carrier circuit of the upstream drier stage. A part of the exhaust vapor emerging from the drier stage is initially solidified with one of the two drier stages and then condensed in the heat exchanger integrated in the heat carrier circuit of the respective drier stage, where the condensation enthalpy is transferred to the heat carrier circuit. A part of the pyrolysis gases produced in the pyrolysis reactor is used as fuel for the burner of a thermal oil boiler (41) integrated in the heat carrier circuit of the upstream drier stage and/or the downstream drier stage. The boiler is arranged in the heat carrier circuit of the downstream drier stage. The exhaust gas of a boiler burner is conducted by the heat exchanger integrated in the heat carrier circuit of the upstream drier stage. The exhaust gas of the thermal power machine is initially conducted by an exhaust gas heat exchanger integrated in the heat carrier circuit of the downstream drier stage. The part of the pyrolysis gases produced in the pyrolysis reactor is used as fuel for the supporting burner of the pyrolysis reactor. A carburetor is led with a pyrolysis coke developed during the pyrolysis of the dried product. A weak gas produced by gasification is supplied as fuel to the supporting burner for the pyrolysis reactor. An INDEPENDENT CLAIM is included for a system of a combined heat and power plant for reclaiming biogenic mass e.g. sludge.    DESCRIPTION OF DRAWING(S) - The figure shows a block diagram of a system for generation electrical energy from clarification sludge.    Drying device (1)    Pyrolysis reactor (2)    Low temperature dryer (3)    High temperature dryer (4)    Gas turbine (5)    Thermal oil boiler. (41)