Seeking help with constant-rate pressure release control method
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I encountered a project in which the pressure inside the container was 30 MPa; the container contained a liquid, and it was required that the pressure be reduced at a rate of 1 MPa/min during depressurization, until it reached atmospheric pressure. I’m not sure what control and adjustment methods to use, so I’m seeking advice from experts here. I would be extremely grateful if you could kindly offer your guidance!
Achieving an absolutely constant rate of pressure release should be quite difficult to control. The only approach is to divide that 1 MPa/min value into several segments, calculate the state of the system before and after each segment, determine how much material should be released during each short time interval, and use control valves and flow meters to continuously adjust so as to maintain the desired flow rate throughout those intervals. That’s all I can think of; I’m hoping that experts in automatic control can tell me if this is feasible.
Hysys-Utility contains a depressing module that can dynamically simulate the pressure relief process. The process of filling a container with liquid is a bit more complex, as issues related to flashing and heat transfer need to be taken into account.