Rotary kinetic fluid motors or pumps – Method of operation
Patent
1997-11-21
1999-09-14
Look, Edward K.
Rotary kinetic fluid motors or pumps
Method of operation
415 13, 415 17, 415 26, 415 27, 415 28, 415 47, 415 49, 417440, F01B 2500
Patent
active
059512407
ABSTRACT:
The stroking speed of an antisurge control valve is impeded by the combined damping effects of signal dead time and the inherent lag of ancillary pneumatic components within a primary control loop. Furthermore, as control valve actuator size increases, the negative influence of these two impediments (dead time and lag) is amplified. As a result, control valve response times are adversely affected; and the possibilities of surge-induced compressor damage and process upsets are heightened. For these reasons, this disclosure relates to a method for protecting turbocompressors from impending surge, and for preventing subsequent process upsets, by improving antisurge control. But more specifically, it describes a technique for decreasing damping effects by evacuating control valve actuators (diaphragm or piston) through restrictions having a lower resistance to compressible-fluid flow rather than through volume boosters--consequently, increasing a control valve's opening speed to that of an emergency shutdown. The proposed method (1) allows continuous control of antisurge control valves and (2) incorporates both solenoid valves and quick exhaust valves (located adjacent to the actuators) which are manipulated by predefined discrete signals from antisurge controllers.
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Fisher Paul F.
Mirsky Saul
Compressor Controls Corporation
Look Edward K.
Shanley Matthew T.
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