| 摘要 |
PURPOSE:To obtain uniform, high fuel utilization coefficient by computing a fuel utilization coefficient based on the CO2 concentration in fuel gas on cell stack side and the CO2 concentration on each outlet, and controlling the fuel gas supply amount so that a fuel utilization coefficient in each part is uniform. CONSTITUTION:CO2 in fuel gas does not react in cell reaction but H2 in the fuel gas is consumed in the cell reaction, so, CO2 concentration in the fuel gas is increased on an outlet side. Fuel gas samples are gathered from representative cells by sampling pipes 8 and CO2 concentration in each fuel gas is analized with an analyzer 12 and the results are sent to an arithmetic unit 13 to calculate the fuel utilization coefficient in each representative cell. The fuel utilization coefficient is compared with a standard utilization coefficient, and the deviation is entered into each flow rate control valve 5 of each branch pipe 4 as a control signal 14 from the arithmetic unit 13. When the deviation is plus (flow rate is low), the valve 5 is controlled so as to open it. When the deviation is minus (flow rate is high), the valve 5 is controlled so as to throttle it. Fuel gas supply amount to each part of the stack is made uniform. |
