Download - Anti-Surging Control System
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SURGING
Compressor surge is an unstable flow pattern in a compressor where the total flow athe airfoil alternately stops, flows backwards, and then flows forward.
Surge is associated with a sudden drop in delivery pressure and with violent aerody
pulsation which is transmitted throughout the whole machine.
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REASONS OF SURGING
Poor matching of the compressor to the system requirements.
Inappropriate compressor design.
Inadequate anti-surge control system.
Unfavorable arrangement of piping and process components of the system, which o
magnify surge.
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EFFECTS OF SURGING
Rapid flow and pressure oscillation causes process in stability
Rising temp. inside compressor
Mechanical damage
Tripping of compressor
Changes in the production rate
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IDENTIFICATION OF SURGING
SURGING CAN BE CLEARLY IDENTIFIED BY FOLLOWING SYMPTOMS.
HEAVY THUMPING NOISES IN COMPRESSOR.
EXCESSIVE VIBRATIONS.
RAPID FLUCTUATION IN FLOW.
RAPID FLUCTUATION IN DISCHARGE PRESSURE.
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COMPRESSOR OPER TING CURVE
Pressure
Flow rate
1
2
3 .
MAX.STABLE COMP. FLOW POINT
MIN.STABLE FLOW POINT
WHEN FLOW AT I/L REACHES SONICVEL.NO FURTHER FLOW INCREASE
IS POSSIBLE
DUE TO LOW FLOW ,IT NO LONGER
CAN ADHERE TO SUC. SIDE OF BLADE
SO STALLING OF FLOW
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AB
C D
Pressure
Flow Rate
Flow
which
pressu
resista
discha
from D
SURG CYCLE
o
As flow decreases continuously
to point Acomp loses its
ability to make pressure hence
Ps drops i.e. Pd >Ps and flow
reverses Compressor Operating
point move fromA
toB
. Resultof flow reversal Is that pressure
goes down pressure goes down
at discharge and curve move
from Bto C.
System pressure is going down
comp is again able to developsPressure comp jumps back to
performance curve to Dforward
flow established
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ANTI-SURGE SYSTEM
Anti surge controller protect the compressor against surge by opening recycle valve. this resistance (back press) and system will again come in normal situation.
Recycle the streams icture
Vent the discharge stream
Performance controller
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CHARACTERISTIC CURVE
Operating line
Surge control line
Recycle trip line
Surge limit line
Safety online
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SURGE CONTROL LINE
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RECYCLE TRIP LINE
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SURGE LIMIT LINE
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SAFETY ONLINE
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PICTURE
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AIR EXTRACTION SYSTEM
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SECURITIES ON ANTI SURGE SYSTE
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ANTI SURGE OF GT-601/602
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ANTI SURGE ON GT-603
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ANTI-SURGE ON GT-604
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ANTI SURGE ON C-702
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ANTI SURGE ON K-2502
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MODIFICATIONS IN AS SYSTEM OF G
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RECOMMENDATIONS
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