| 摘要 |
PURPOSE:To reduce a fluctuation in a furnace top pressure as low as possible, by installing a controller, which is backed up by a regulator on the blast furnace side when a controller on the turbine side is brought to a trouble or performs a reverse operation to the above. CONSTITUTION:On the blast furnace 1 side, a signal of a pressure indicating regulator 10 is controlled by bringing the characteristics of a bypass valve 4 into a rectilinear one by means of a high selector 32 and a function operator 33. On the turbine 6 side, a signal of a pressure indicating regulator 13 enters a ratio setter 36, and outputs of another function operator 37 and a pressure control signal are selected at a low level via a low selector 38 to control them by means of a governor valve 5 and a static vane driving device. The two control systems are selectable by a switching device 31, and a regulator in an inoperative state, follows up a regulator operated by means of an external feedback signal. This enables reduction of a fluctuation in a pressure at a furnace top to as low as possible since an insensible zone is prevented from being created if the switching device 31 is happened to be operated. |
