Anti-surge control in a centrifugal compressor working with co2 in supercritical conditions based on flow measurement at discharge
AssigneeNuovo Pignone Tecnologie Srl
InventorAlessandro MEO
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Abstract
The compressor arrangement comprises a centrifugal compressor configured to work with CO2 in supercritical conditions and comprises an anti-surge control system; the anti-surge control system is configured to measure CO2 flow at the discharge side of the centrifugal compressor and to calculate CO2 suction density and CO2 discharge density based on temperature and pressure both at suction side and at discharge side so that compressor maps may be used for anti-surge control of the centrifugal compressor when CO2 is in supercritical conditions at an inlet of the centrifugal compressor.
Claims15
A method for performing anti-surge control in a centrifugal compressor working with CO2 in supercritical conditions, the method comprising:
- providing an anti-surge loop including an anti-surge valve configured to control CO2 flow in the anti-surge loop;
- calculating a CO2 suction density at a suction inlet of the centrifugal compressor;
- calculating a CO2 discharge density at a discharge outlet of the centrifugal compressor;
- calculating a distance of the centrifugal compressor operating point from a surge limit;
- and
- regulating the anti-surge valve as a function of the distance of the centrifugal compressor operating point from the surge limit taking into account:
- the calculated CO2 suction and discharge densities, and
- a CO2 volumetric flow at a discharge outlet of the centrifugal compressor or a parameter related to the CO2 volumetric flow at a discharge outlet of the centrifugal compressor, the CO2 volumetric flow at a discharge being related to a CO2 mass flow at a suction inlet.
Dependencies are inferred from the claim text.