| 摘要 |
The focus of the invention is a control method for a fuel cell device utilizing fuel, which comprises essentially varying species content values, in which method fuel cells of the fuel cell device are arranged to fuel cell stacks (103), and the fuel is flown through the anode sides (100) of the fuel cells in said stacks. In the control method acoustic signals are transmitted into the fuel flow by transmitters (124, 125), and the transmitted acoustic signals are received from the fuel flow by receivers (126, 127) to form measurement information, which is processed at least on the basis of time differences of the received acoustic signals to determine fuel flow velocity and average acoustic speed information of the fuel. In a separate fuel analysis process is formed content information of at least one species in the fuel, which content information is utilized together with said average acoustic speed information for determination of contents of last two species in fuel composition to determine the fuel composition for controlling at least fuel utilization rate and O/C ratio of the fuel cell device on the basis of the determined fuel composition and the determined fuel flow velocity. |
