What is the impact on the overall operation of the unit when a two-cylinder centrifugal CO2 compressor extracts some CO2 from the second-stage outlet of the low-pressure cylinder?
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For the CO2 compressors in Novi Bilongo, Italy (two-cylinder, four-stage design, 2MCL606+2BCL306/A; speed increase is achieved through a gearbox between the two cylinders), what impact would it have on the operation of the entire unit if half of the CO2 flow were extracted from the outlet of the second stage? How will the surge curve change?
Think of it as two centrifugal compressors: the outlet at the second stage removes half of the flow, which is equivalent to a reduction in the inlet flow rate of the second compressor
The flow rate at the second-stage inlet has decreased, and surge is possible.