Method and apparatus for antisurge control of multistage compres

Rotary kinetic fluid motors or pumps – With control means responsive to non-cyclic condition... – Plural diverse condition responsive

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415 1, F01D 1700

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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:
patent: 3876326 (1975-04-01), Weitz
patent: 4156578 (1979-05-01), Agar et al.
patent: 4274260 (1981-06-01), Bukajlo
patent: 4656589 (1987-04-01), Albers et al.
patent: 4687410 (1987-08-01), Cline et al.
patent: 4781525 (1988-11-01), Hubbard et al.
patent: 4810163 (1989-03-01), Blotenberg
patent: 4949276 (1990-08-01), Staroselsky et al.
patent: 5000459 (1991-03-01), Swearingen et al.
patent: 5355691 (1994-10-01), Sullivan et al.
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.

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