Method and device for operating turbocompressors with a pluralit

Details Method and device for operating turbocompressors with a pluralit Method and device for operating turbocompressors with a pluralit

1999-06-18

2000-12-26

Look, Edward K.

Rotary kinetic fluid motors or pumps

Method of operation

415 17, 415 28, 415118, F01D 1700

Patent

active

061649015

ABSTRACT:
A process for operating multistage turbocompressors (2, 22, 42) with a plurality of controllers (15, 35, 55) which interact one with each other, in which each compressor stage has anti-surge control valves (5, 25, 45) of its own, which recycle into the suction lines (1, 21, 41) of their respective own compressor stage (2, 22, 42). The control is performed by flow computers (6,26,46) for calculating the suction flow and computers (7,27,47) for determining the minimum acceptable flow from the delivery head. A comparison unit (12, 32, 52) determines the difference between the set point (derived from delivery head) minus the actual value (flow) and whenever the actual value is too low compared with the set point, it brings about a gradual opening of the corresponding surge line control valves (5, 25 and 45) until the actual flow exactly corresponds to the flow set point, which depends on the particular delivery head. The control takes place via a maximum selection (14, 34, 54), which is arranged upstream of the anti-surge controller (15, 35, 55) with the signal lines (16, 36, 56) to the surge line control valve (5, 25, 45).

REFERENCES:
patent: 4298310 (1981-11-01), Blatenberg
patent: 4640665 (1987-02-01), Staroselsky et al.
patent: 4946343 (1990-08-01), Blatenberg
patent: 5347467 (1994-09-01), Staroselsky et al.
patent: 5435122 (1995-07-01), Ahlin et al.
patent: 5726891 (1998-03-01), Sisson et al.
Kono Susumu et al. Nov. 25, 1997 Control Device for Compressor Patent Abstracts of Japan.

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