| 摘要 |
PURPOSE:To enable to perform the quick-response and stable control of flow rate of coal by a method wherein coal is fed in precedence in synchronism with the flow rate of primary air. CONSTITUTION:A control signal sent to a stoker is outputted by summing up the correction signal of the output of a divider B04, which represents the ratio of the differential pressure of a mill and the differential pressure of primary air, to a stoker command B01. A command sent to a primary air damper is an opening command of a damper 204 and controls the air flow for carrying the coal pulverized at the mill 202 to a burner 301. Concretely, the command sent to the primary air damper lets the stoker command output a signal, which has corrected the differential pressure of primary air, through a proportional integrator. A preceding control circuit B08 is added to a stoker system control circuit in order to bring the lag of rise of the differential pressure of a mill so as to be equal to the lag of rise of the differential pressure of primary air. Consequently, the lag of response of the quantity of fed coal with respect to the fuel requiring command is brought so as to be closer to the lag of response of the primary air, resulting in enabling to keep the mill ratio constant and to improve the load following-up properties. |
