Method of regulation that prevents surge in a turbocompressor by

Details Method of regulation that prevents surge in a turbocompressor by Method of regulation that prevents surge in a turbocompressor by

1989-03-09

1990-06-26

Garrett, Robert E.

Rotary kinetic fluid motors or pumps

With control means responsive to non-cyclic condition...

Responsive to moving member developed fluid force, current...

F04D 2702

Patent

active

049367412

ABSTRACT:
A regulating method for preventing surges in a turbocompressor by initiating blow-off when necessary during operation. Flow to the turbocompressor and the compressor outlet pressure are measured continuously, and a first regulating difference is calculated from these measurements. This first regulating difference is then applied as an input parameter to a regulator which has a limited response rate. The output of this regulator is then used as a regulating parameter for a blow-off valve. The blow-off valve is opened rapidly by safety controls under malfunctioning conditions that tend to stress the limited response rate of the regulator. A second regulating difference is calculated from the preceding measurements or from the first regulating difference to indicate the need to open rapidly the blow-off valve. The calculation of the second regulating difference is carried out with predetermined reference values, and this calculated second regulating difference is applied to a threshold stage which emits a rapid-opening parameter when the second regulating difference exceeds a predetermined threshold stored in that threshold stage. The rapid-opening parameter is forwarded to the regulator, and an accelerated change in a valve-adjustment parameter is generated in the regulator by additive superposition for activating the valve in the opening direction to protect the turbocompressor against occurrence of pressure surges.

REFERENCES:
patent: 4139328 (1979-02-01), Kuper et al.
patent: 4384818 (1983-05-01), Blotenberg
patent: 4464720 (1984-08-01), Agarwal
patent: 4781524 (1988-11-01), Blotenberg
patent: 4789298 (1988-12-01), Blotenberg
patent: 4796213 (1989-01-01), Blotenberg
patent: 4831534 (1989-05-01), Blotenberg

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