Operating method for a solid oxide cell system

A method of operating a solid oxide cell system that is configured to produce at least one of:

• (i) carbon dioxide CO2;
• (ii) hydrogen H2;
• and (iii) synthesis gas CO+H2 from an electrochemical conversion of one of:
• (i) water steam H2O (g);
• and (ii) a mixture comprising water steam H2O (g) and carbon dioxide CO2, the method comprising:
• admixing a quantity of at least one other substance into the one of:
• (i) the water steam H2O (g);
• and (ii) the mixture comprising water steam H2O (g) and carbon dioxide CO2 for conversion into synthesis gas CO+H2, wherein the at least one other substance is selected from the group consisting of natural gas, methane CH4 or another hydrocarbon, wherein an endothermic reforming of the admixed hydrocarbons takes place by coupling in waste heat from the electrochemical conversion and the quantity of the at least one other substance in order to compensate for effects of a degradation of the solid oxide cells of the solid oxide cell system;
• producing a quantity of hydrogen H2;
• determining at least one of:
• (i) a total quantity of hydrogen produced by the system;
• and (ii) a quantity of the synthesis gas produced by the system;
• and
• structuring a control device to,
• receive measurement signals from a mass flow controller,
• transmit signals from the control device to the mass flow controller to control an electrolysis process based on at least one of:
• (i) the determined total quantity of hydrogen produced by the system;
• and (ii) the determined quantity of synthesis gas CO+H2 produced by the system;
• and
• regulating addition of the quantity of hydrogen H2 to the system such that the total quantity of hydrogen H2 generated by the solid oxide cell system is kept constant over a time with respect to an operation under a nominal load.