F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
121/63
F15B 13/02 (2006.01)
Patent
CA 1108946
ABSTRACT OF THE DISCLOSURE A control apparatus for antisurge protection of a dynamic compressor including a junction of a closed antisurge loop with a surge limit computing module and a two-mode controller with a relay backup system with deviation alarms provided herein. In its opera- tion during a slow disturbance, the two mode controller provides modulated antisurge protection by opening a relief valve, if the operating point of the compressor crosses the surge control line. During a dangerously fast disturbance, the relay backup system provides antisurge protection if a preestablished deviation of the operating point from the surge control line appears. A relay backup system opens the relief valve very quickly. When the relief valve is so opened, the process of the user of fluid from the compressor is compensated by increasing the performance of the compressor to maintain pressure or flow rate. Then the relay system closes the relief valve with a relatively slow speed, which prevents a danger- ous deviation of the operating point from the surge control line. In time, the surge limit line may change so that the surge control line is no longer correctly placed. If under such circumstances surge appears, then the backup relay system opens the relief valve very fast, closes it with a relatively slow speed and changes the position of surge control line. A much higher reliability of con- trol of the compressor is thus achieved when operating close to the surge control line. This permits an expansion of the safe operating zone of the dynamic compressor and also increases the safety of operation of the process using the compressed gas.
317129
Compressor Controls Corporation
Marcus & Associates
LandOfFree
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