Insert the anti-surge valve and provide all the dynamic parameters.
Rotating stall involves only one sector of the cross sectional area of the compressor, where the flow recirculates instead of moving forward.
During surge, the flow oscillates axially and this perturbation involves the full cross sectional area of passage.
When this practice involves the last stage of compression of carbon dioxide in a multistage configuration, the process fluid is firstly compressed from subcritical state to supercritical state inside the centrifugal compressor and then it expands from supercritical state to subcritical state along the recycle line. However in the refrigeration industry the research goal is the thermal optimisation of the cycle and positive displacement machines are employed (Conboy et al., 2013 and Salazar and Mendez, 2014).
Dear All, I have to validate an Antisurge Valve of a centrifugal compressor using Dynamic Simulation in Aspen HYSYS. Also I have to specify initial tuning parameters for the Antisurge controller.
The paper demonstrates that compared to the hot recycle, the process configuration including a cold gas recycle has better overall stability, but higher power consumption and lower values for the control performance indicators.
Based on the previous considerations, the paper gives suggestions regarding the choice of the recycle configuration.If rotating stall takes place, the efficiency of the machine decreases and this can locally damage the machine, especially the blades.If surge happens, the most likely consequence is vibration that can damage blades, casing and bearings ().Voltage or power dips are electric disturbances encountered in EDC which are mainly caused by faults in the electrical grid and might last for durations up to 150 ms.For gas compression applications, the loss of driver torque often puts the gas compression process at risk of surge conditions, which is a safety critical constraint.The manipulated variables of the proposed advanced controller are the electric motor torque and the position of a recycle valve, whereas the measured quantities are the same as those of a typical compressor control application including the pressure ratio and the gas flow.