Refrigeration generation method and system

Prime-mover dynamo plants – Turbogenerators

Reexamination Certificate

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C290S04000F

Reexamination Certificate

active

08004102

ABSTRACT:
The present invention provides a method and apparatus for generating refrigeration in a process operating at sub-ambient temperatures in which the refrigeration is generated by a turboexpander. The turboexpander is coupled to a generator controlled so that its speed is maintained at a setpoint through electromagnetic braking and its power output is maintained at line matching voltage and frequency. The speed control of the generator therefore, also controls the speed of the turboexpander. The setpoint is calculated to be equal to a product of an operational efficiency parameter, U/Co, and a square root of twice the enthalpy drop in the flow passing through the turboexpander divided by a product of pi and a diameter of an impeller employed within the turboexpander.

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Reuter, K., “Integrated System of Turboexpander with Magnetic Bearings and High Frequency Generator”, Third Symp on Magnetic Bearings, 1992.
Reuter, K., “Integrated Machinery Systems for Cryogenic Processes Consisting of Turboexpander, Compressor, High-Frequency Motor and Generator with Magnetic Bearings”, Proceedings of the 1997 IEE Colloquium on High Speed Bearings for Electrical Machines, IEE Colloquium Digest, No. 164, 1997.

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