Instrument loop control
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I hope an expert can explain this circuit control
1. The P&ID diagrams are incomplete and not clear enough； 2. Complex control loops must have control loop diagrams, which make the logical relationships clearer; they can also be understood in conjunction with descriptions of the complex control mechanisms ； 3. Personally, I think it is about the calculation and control of heat. (The heat that can be generated through calculations based on the temperature difference, heat capacity, and flow rate of the material; the required heat amount is a set value, and the necessary material flow rate is determined by reversing these calculations.)
It’s quite vague; at first glance it seems to be temperature compensation, and secondly, cascade control
In addition to PID diagrams, complex control systems also include textual explanations. Some things cannot be clearly expressed through pictures.
The diagram is not clear; a simple guess would be steam flow rate, temperature, and pressure compensation plus cascade control, while for a more complex setup it’s unclear what calculations are being performed and whether there is any feedforward control. . .