Questions about DCS
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For a reactor, with parameters such as the reactor temperature, jacket temperature, and reactor pressure – 3 control variables used to regulate 1 pneumatic control valve – how should this be configured and programmed in a DCS?
Is there a PID diagram or control scheme?
There is one control valve for the kettle temperature, jacket temperature, and kettle pressure, right? There must be a logical relationship here; it’s not the kind of control system with three controls and one actuator as you mentioned. Analyzing the question, the temperature and pressure of the reactor itself aren’t really related. But since you mentioned the jacket temperature, I guess it might be a control valve used to regulate the flow rate of the heat source medium in the jacket. This control valve regulates the amount of heat source medium that enters the jacket, which in turn affects the temperature of the reactor; and the reactor temperature then affects the pressure. In this way, it’s possible to directly observe these three values through two temperature changes and one pressure change, right? ? ? Is that so? If that’s the case, reply and let me know how you think about this issue; if not, just ignore what I said... Even if it means having three controls and one more thing, I still won’t do it……
It can form a cascade control system for the reactor temperature and jacket temperature, with the reactor pressure used for compensation calculations.
This requires cascade control, I’m not sure about the specifics
The analysis on the 4th floor is very thorough; that’s exactly how it is – the drawings produced by the design institute show a circuit consisting of 3 variables and one control valve. I hope experts can provide some guidance
One variable controls a valve, while the other two variables are interlocked with the control valve for estimation and adjustment purposes
There should be no problem with this. I’m from a process engineering field; I proposed choosing one out of three temperatures and one out of three pressures, in order to control the control valve or shut-off valve
What was said on the 5th floor is correct: use a valve for jacket temperature control, add cascade control for the reactor temperature, and pressure can be used as a feedforward element or for interlock purposes.