Rotary kinetic fluid motors or pumps – With control means responsive to non-cyclic condition... – Plural diverse condition responsive
Patent
1995-11-03
1997-02-04
Kwon, John T.
Rotary kinetic fluid motors or pumps
With control means responsive to non-cyclic condition...
Plural diverse condition responsive
415 1, F01D 1700
Patent
active
055991610
ABSTRACT:
Compressors for processes, as used for refrigeration systems applied to ethylene production, are multiple stage machines; furthermore, sidestreams enter/exit between the stages. Since a flow measurement device is not available between stages, and the gas temperature entering most stages is unknown, it is difficult to calculate an accurate value for reduced flow for antisurge control purposes. A new method is described, whereby reduced flow alone is replaced by the product of the reduced flow and the equivalent speed. This allows accurate calculation of the distance of the operating point to the surge line since the inlet temperatures into the separate compression units (except the first) are not necessary. The invention described herein can be applied to multistage compression systems for a variety of processes.
REFERENCES:
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Manual--200-pages from Compressor Controls Corporation printed 1987-1995 and entitled Series 3 Plus Antisurge Controller for Centrifugal and Axial Compressors--Publication IM301 (4.0) Sofware Revision: 753-002 Dec. 1995.
Copy--33 page document by Dr. Naum Staroselsky and Saul Mirsky, P.E.--dated 1986 and entitled More Effective Control Of Refrigeration Compressors.
Compressor Controls Corporation
Kwon John T.
LandOfFree
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