How should the PID control for the temperature of the superheated steam desuperheater be set?
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Medium-pressure steam at 400°C is cooled to 200°C. The original PID settings were P at 100%, I at 100 seconds, and D at 40 seconds; however, when automatic mode is used, there are significant fluctuations (about ±15°C). Does anyone with experience in this area know how the PID should be set?
This differential time is quite large, which can easily lead to oscillations; it might be possible to reduce it gradually. There are already many forums on PID tuning methods; you can search for them by yourself.
The three PID values can be calculated: reduce the P value and increase the I value.
I searched for some information online, which mentioned PID parameters related to temperature control: P ranges from 20-60%, I ranges from 180-600 seconds, and D ranges from 30-180 seconds. However, no matter how many times I tried using these PID parameters, the results were still not satisfactory.
Try reducing P appropriately; it’s best to adjust it in conjunction with the trend of the controlled parameter!