(EP862234-A1)      The fuel cell energy production plant has a reformat production unit (2) containing a reforming reactor (4). A valve (8) in the reformat feed line (7) is controlled in such a manner, that it releases or interrupts, the feeding of the reformat delivered by the reformat production unit (2) in the fuel cell arrangement (1), depending on the output signal of the at least one reformat quality indicating sensor (12,23,14,17). In addition/or a supply air regulating valve (29) is arranged in an air or an acid feed line of the fuel cell feed line (9) of the fuel cell arrangement (1).    The valve is controlled by the control unit (15), depending on the output signal of at least one reformat quality indicating sensor. At least respectively one reformat quality indicating sensor (12,14) is provided at the entry side and the output side of a reformat refining unit (5,6), of the reformat production unit (2), connected to the reforming reactor (4).    ADVANTAGE -   Reacts very quickly to disturbances with reformat preparation to prevent any harming of fuel cell arrangement.    (EP862234-B1)      The fuel cell energy production plant has a reformat production unit (2) containing a reforming reactor (4). A valve (8) in the reformat feed line (7) is controlled in such a manner, that it releases or interrupts, the feeding of the reformat delivered by the reformat production unit (2) in the fuel cell arrangement (1), depending on the output signal of the at least one reformat quality indicating sensor (12,23,14,17). In addition/or a supply air regulating valve (29) is arranged in an air or an acid feed line of the fuel cell feed line (9) of the fuel cell arrangement (1).    The valve is controlled by the control unit (15), depending on the output signal of at least one reformat quality indicating sensor. At least respectively one reformat quality indicating sensor (12,14) is provided at the entry side and the output side of a reformat refining unit (5,6), of the reformat production unit (2), connected to the reforming reactor (4).    ADVANTAGE -   Reacts very quickly to disturbances with reformat preparation to prevent any harming of fuel cell arrangement.    (US6083637-A)      The fuel cell energy production plant has a reformat production unit (2) containing a reforming reactor (4). A valve (8) in the reformat feed line (7) is controlled in such a manner, that it releases or interrupts, the feeding of the reformat delivered by the reformat production unit (2) in the fuel cell arrangement (1), depending on the output signal of the at least one reformat quality indicating sensor (12,23,14,17). In addition/or a supply air regulating valve (29) is arranged in an air or an acid feed line of the fuel cell feed line (9) of the fuel cell arrangement (1).    The valve is controlled by the control unit (15), depending on the output signal of at least one reformat quality indicating sensor. At least respectively one reformat quality indicating sensor (12,14) is provided at the entry side and the output side of a reformat refining unit (5,6), of the reformat production unit (2), connected to the reforming reactor (4).    ADVANTAGE -   Reacts very quickly to disturbances with reformat preparation to prevent any harming of fuel cell arrangement.