Heat exchanger control problems: Part 4, accommodating the change in process behaviour
The other strategy is adaptive tuning. Here, we assume that the DCS can provide three separate PID tuning constants. The zones, shown in figure below, are selected to span the operating conditions from 20,000 kg/h (gain of 6) to 110,000 kg/h (gain of 0.8), with a uniform ratio from one zone to the next. Now that we have…