TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Method: A second amount of heat at least partially derived from the second emission in the form of waste heat of the emitter is supplied to the electrolysis device and/or the reactor, in addition to an optional first amount of heat supplied via the first emission. The second emission in the form of waste heat the emitter is provided at least partially to generate water vapor outside the emitter, with which the electrolysis device is energized. The electrolysis device is at least partially operated with the second emission in the form of water that comes from at least one combustion chamber of the emitter. The generated oxygen in the electrolysis device is supplied into the emitter as an oxidizing agent (7) for its firing. The electrolysis device is supplied with an electrical energy obtained from a renewable energy source. At least two different chemical reactors are operated downstream the electrolysis device for converting at least two identical or different portions of the exhaust gas and hydrogen into at least two different synthetic base- or fuel materials. The first portion of the exhaust gas carbon dioxide is converted into a hydrocarbon compound or its derivative with hydrogen in a first chemical reactor, and the second portion of the exhaust gas nitrogen is converted into ammonia with hydrogen in a second chemical reactor. The electrolysis device and the chemical reactor are operated at same pressure level. Preferred Components: The second emission in the form of heat uses at least one component of the emitter for heating the electrolysis device and/or the reactor. The first emission comprises carbon dioxide as the portion of the exhaust gas, where the formed synthetic base- or fuel material is provided at least partially for firing the emitter. The emitter is a furnace, preferably rotary furnace for producing cement clinker, a metallurgical furnace, a tunnel furnace, a hood-type furnace or a glass furnace. The electrolysis device is formed through a high-temperature electrolysis unit or a low-temperature electrolysis unit, preferably proton exchange membrane electrolysis unit. The second device comprises: at least one heat transferring unit, which is equipped to transfer the second emission in the form of waste heat of the emitter at least partially into the electrolysis device or the reactor; and at least one steam generator, which is equipped to generate water vapor outside the emitter via the second emission in the form of waste heat of the emitter, and the water vapor supply its power at least partially to the electrolysis device. At least one supplying line is provided for the second emission in the form of water that comes at least partially from the combustion chamber of the emitter, to the electrolysis device. At least one gas line is provided, through which the generated oxygen in the electrolysis device is supplied at least partially into the emitter as the oxidizing agent for its firing. At least two chemical reactors are provided, where the reactors exhibit different catalytic materials, and are equipped to convert the identical or different portions of the exhaust gas into the different synthetic base- or fuel materials. At least one collecting device (4) is provided for storing the synthetic base- or fuel material. The collecting device is connected with the emitter via the supplying line, through which the synthetic base- or fuel material is supplied for firing of the emitter.