Method and apparatus for controlling a dynamic compressor

Details Method and apparatus for controlling a dynamic compressor Method and apparatus for controlling a dynamic compressor

1975-02-11

1976-11-30

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

417 20, 417 24, 417 23, 417 28, 417 29, 417 47, F04B 4900

Patent

active

039946231

ABSTRACT:
A method is disclosed for a cascade control of a dynamic compressor to maintain a constant mass flow rate to a process. The method consists of a successive junction of control loops for controlling the speed of rotation, the pressure in the delivery, and the mass flow rate; the output signal of each outer loop being the input signal for the inner loop and each of the loops containing a compensating element to reduce the effects of large time constants of all previous loops.
An automatic control system based on using the above method, distinguished by its great static and dynamic precision in maintaining a controlled parameter, and by the high reliability of protection of the compressor from surge, and protection from a dangerous increase of the speed of rotation and of a dangerous increase of the discharge pressure.

REFERENCES:
patent: 2870716 (1959-01-01), Meneley
patent: 2871671 (1959-02-01), Bartlett et al.
patent: 2933236 (1960-04-01), Mathieson
patent: 2961964 (1960-11-01), Williams et al.
patent: 3068796 (1962-12-01), Pfluger et al.
patent: 3424370 (1969-01-01), Law
patent: 3431858 (1969-03-01), Lynn et al.
patent: 3829232 (1974-08-01), Fieglein et al.
patent: 3859006 (1975-01-01), Randell

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