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May I ask the experts how this step-by-step control is implemented? How do the A, B, and C valves function? Thanks! ! !
During startup, nitrogen injection and flare venting form a proportional control loop; under normal conditions, fuel gas and flare venting constitute the proportional control loop!
The pressure of V101 is controlled via a split-control system; when the pressure is low, control valve B or C (selected by the HS switch) is used to regulate the pressure of V101； When the pressure is high, valve A is used to control the pressure of V101.
The pressure of V101 is controlled via a split-control system; when the pressure is low, control valve B or C (selected by the HS switch) is used to regulate the pressure of V101； When the pressure is high, valve A is used to control the pressure of V101. Agree