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Magnetic Bearings in Turboexpander Applications

Source: AIChE
  • Type:
    Conference Presentation
  • Conference Type:
    AIChE Spring Meeting and Global Congress on Process Safety
  • Presentation Date:
    March 21, 2010
  • Duration:
    30 minutes
  • Skill Level:
  • PDHs:

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Magnetic bearings in turboexpander have become the standard for the installation in gas processing and ethylene plants; there are areas of the design that are challenging to the designer for each application. This paper begins with a review of magnetic bearings, the components and how they operate with a focus on ethylene applications followed by a discussion of enthalpy drop and its relation to the effect on tip speed, and spouting velocity and efficiency and power related to magnetic bearing design. The rotor length for a magnetic bearing is longer than for oil bearing machines and with high tip speed it is possible to hit several machine limits. A discussion on these rotordynamic effects will be covered including dynamic stiffness and tuning.

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