High Speed Oil-Free Turbomachinery String.
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Date
1998
Journal Title
Journal ISSN
Volume Title
Publisher
Texas A&M University. Turbomachinery Laboratories
Abstract
This paper is a discussion of the design, manufacture, test, and
field operation of a totally oil-free string of rotating equipment. The
turbomachinery string consists of a multistage centrifugal
compressor driven by a single valve multistage steam turbine. The
steam turbine is rated at 1837 kW (2463 hp) with a maximum
continuous speed of 9734 rpm. The string is currently operating in
propane refrigeration service at a petrochemical complex in Saudi
Arabia. Both the steam turbine and the compressor have magnetic
journal and thrust bearings, dry gas face seals to contain the process
gas in the compressor, and pneumatic/electronic actuators control the
steam flow through the steam turbine while providing trip protection.
The design of the compressor, steam turbine, associated
components, and the control theory required by the magnetic
bearings are reviewed and discussed in detail. The development of
the theoretical rotordynarnic simulation for magnetic bearings is
presented and the results are compared with actual operating
conditions. Special consideration is given to the coastdown case
where the rotors are delevitated onto the auxiliary bearings. Shop
testing and control system tuning of the assembled turbomachinery
string along with field operating experience are reviewed. ยท
Finally, the trouble spots encountered during the design,
manufacture, testing, installation, and field operation of this oilfree
string are discussed and suggestions are made in order to avoid
these problems in the future.
Description
Lecture
Pg. 77-84
Pg. 77-84