| 摘要 |
PURPOSE:To recover efficient energy by opening and closing only a part of stationary vanes when the flow rate of the blast furnace gas that passes through a recovery turbine is low, while opening and closing the whole stationary vanes at the same angle when the flow rate of the gas is high. CONSTITUTION:Stationary vane driving signals xsi which are sent out from a governor 8 is fed to the two converting parts 91, 92 of a signal converter 9 through a line l1 and, then, they are fed to stationary vane driving devices 521, 522 through lines l2, l3, as output signals xsi1, xsi2 respectively. Each of the driving devices 521, 522 controls the stationary-vane angles of a part of stationary vanes 511 and the stationary-vane angles of the remaining stationary vanes 512 through driving rods 531, 532 respectively. That is, when the flow rate of a blast furnace gas passing through a recovery turbine is low, the stationary- vane angles of only a part of stationary vanes 511 are controlled, while controlling the remaining stationary vanes to be in a totally closed condition. On the other hand, when the flow rate of the gas is high, the stationary-vane angle of the whole stationary vanes 511, 512 are controlled so as to be opened or closed at the same angle or almost at the same angle. |
