| 摘要 |
A method for controlling the level of a drum in a drum-type boiler includes adjusting a gain of a drum level PID 102 (a Proportional Integral Derivative control) in accordance with a signal representative of a set of tuning constants, a signal representative of drum level, and a signal representative of a drum level setpoint. The method also includes utilizing a flow control PID 106 to adjust a drum level control valve 108, wherein the flow control PID adjusts the drum level control valve in accordance with an output of the drum level PID, a signal representative of steam flow, and a signal representative of drum feedwater flow. A constant differential pressure may be maintained across the drum level control valve. The tuning constants may include minimum and maximum proportional gain and minimum and maximum drum level error. |
