Help request: Three-element control for boiler drum pressure
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The three-input control of the drum uses steam flow and feedwater flow for feedforward control, but is cumulative flow (FICQ) used for feedforward control as well? What’s the difference from real-time flow (FIC) control? A newcomer seeking advice; I hope the more experienced members will kindly share their knowledge.
The issue has been resolved; ficq is merely for display purposes and does not play any role in control
The three impulses refer to the steam generation rate, the control between the boiler water level and the water inflow rate; it has nothing to do with the cumulative flow rate, right?
Yes, the cumulative amount is merely a display used for cost calculation and is not involved in control
In the three-interaction control system for the drum, the drum liquid level is the primary controlled variable, while the feedwater flow rate is the secondary controlled variable. The drum liquid level and feedwater flow rate form a cascade control system; steam flow rate, acting as a disturbance, is introduced into the control system for feedforward control. The water supply flow rate is not a feedforward quantity.