| 摘要 |
PURPOSE:To effectively recover a fluctuation in a gas pressure as an electric power through simple constitution, by a method wherein a back pressure turbine for controlling a pressure is connected to a gas producing device, a deviation between a gas pressure and a set pressure is controlled by a control generator directly coupled to a turbine. CONSTITUTION:A back pressure turbine 2 serving as a governor is coupled to a furnace top part 1a of a blast furnace 1, through a governor valve 3 on the incoming side and a control generator 7 is coupled directly to the turbine 2. A gas pressure in the blast furnace 1 is detected by a detector 15, and the detecting result is input to a pressure control circuit 11 of a control device 8. The pressure control circuit 11 determines a deviation between a set pressure and a gas pressure to send a control signal to a power converter 10. When the pressure of a furnace top is higher than a set pressure, a power amount fed from a generator 7 to a power system is increased, and when lower than the set pressure, a power amount is decreased to hold the pressure of the top furnace at a set pressure. This enables a fluctuation in a top furnace pressure to be recovered as an electric power without closing a governor valve on the incoming side and incurring of a pressure loss. |
