NOVELTY - The device (100) comprises a combustion system (10) having an exhaust gas line (11) and an oxygen input (22), by which the gas containing oxygen is fed into a combustion chamber of the combustion system, a turboreactor (30) connected to the exhaust gas line, so that it is fed with carbonaceous exhaust gases and heat energy from the combustion system, a compressor device having an air inlet, an oxygen outlet, a nitrogen outlet and an air separation device, a generator, and an accumulator. The turboreactor comprises a first reaction area designed for performing a redox reaction.    USE - Device for stationary use or mobile use such as ships, buses, trains, cars and trucks, for increasing the efficiency of a combustion system, for further processing the exhaust gases from the combustion system, and useful as auxiliary power supply units for vehicles and as heating system or energy supplier for the household or smaller operations.    ADVANTAGE - The device is capable of simply and inexpensively increasing the efficiency of the combustion system thus reducing the displacement potential and the fuel consumption of the combustion engine without any compromise on performance, and allows mobile and remote energy supply.    DETAILED DESCRIPTION - The device (100) comprises a combustion system (10) having an exhaust gas line (11) and an oxygen input (22), by which the gas containing oxygen is fed into a combustion chamber of the combustion system, a turboreactor (30) connected to the exhaust gas line, so that it is fed with carbonaceous exhaust gases and heat energy from the combustion system, a compressor device having an air inlet, an oxygen outlet, a nitrogen outlet and an air separation device, a generator, and an accumulator. The turboreactor comprises a first reaction area designed for performing a redox reaction, a nitrogen input, and a second reaction area. The second reaction area is fed by the nitrogen input with nitrogen-containing gas, and is designed primarily for performing a nitriding reaction, where a reduced intermediate product from the first reaction area reacts with the nitrogen-containing gas. The oxygen-containing gas and the nitrogen-containing gas are readily provided by the compressor device. The compressor device is drivable mechanically by the combustion system over a mechanical coupling and/or electrically with a current from the accumulator. The turboreactor is mechanically drivable by the combustion system over a further mechanical coupling, and has an exit side for delivering reaction products and/or a connection to the generator. The generator is drivable by the turboreactor and the accumulator is supplyable with current by the generator. The turboreactor has an inlet for supplying silicon dioxide, where in this case the reduced intermediate product is elementary silicon, which reacts in the second reaction area with the nitrogen-containing gas exothermally to silicon nitride, where the heat energy is released. The silicon nitride is converted to ammonia in a downstream system. The device includes a tank for storing ammonia or a fuel cell for the conversion of ammonia in current. The turboreactor has an inlet for hydrocarbon-containing gas that is blowable to run a carbothermal nitriding in the turboreactor, and/or an inlet for oxygen-containing gas that is blowable to run an oxidation as partial reaction of the redox reaction. The device comprises a flow controller to control the reactions in the turboreactor by the supply of carbon-containing exhaust gas, the heat energy, nitrogen-containing gas, hydrocarbon-containing gas and/or oxygen-containing gas. The combustion system is designed for carrying out a combustion reaction of hydrocarbon with oxygen. An INDEPENDENT CLAIM is included for a method for increasing the efficiency of a combustion system and for reprocessing the exhaust gases from the combustion system.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of a first device.    Combustion system (10)    Exhaust gas line (11)    Oxygen input (22)    Turboreactor (30)    Device. (100)