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Source: alexandria.tue.nl
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Sat May 19, 2012 05:14:29 AM
Short Desciption:
The anti surge valve is a fail open solenoid valve. This means that it needs a ... Figure 2.10 Characteristic of solenoid valve at u = 1. 2.5 Disturbances
Summary:
In order to obtain natural gas from a well, it is necessary to pump it to the surface and
into a network. The pump normally used in this case is a centrifugal compressor. Besides
the pressurization and transportation of fluids in the process and chemical industries,
other appiications of centrifugai compressors invoive fiuid compression for use in aircraft
engines, in industrial gas mbines and in nubocharged combustion engines j i j. The
working principle of a centrifugal compressor is to increase the kinetic energy of the fluid
with a rotating impeller. The fluid is then slowed down in a volume called the plenum,
where the kinetic energy is converted into potential energy in the form of a pressure rise.
Centrifugal compressors have an instable working region. In this region, a decrease of
flow results in a decrease of outlet pressure. When the plenum pressure behind the
compressor is higher then the compressor outlet pressure, the fluid tends to reverse or
even flow back in the compressor. As a consequence, the plenum pressure will decrease,
inlet pressure will increase and the flow reverses again. This phenomenon, called surge,
repeats and occurs in cycles with frequencies varying from 1 to 2 Hz. Another
aerodynamic instability that can occur in centrifugal compressors is stall. Both
instabilities dramatically decrease the efficiency and severe surge can even cause
mechmical danage to the compressor. In the case study of this internal traineeship, stall
is not taken into account and all attention is focused on avoiding surge.
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Leave comment :
"Modeling simulation and evaluation of a centrifugal compressor with surge avoidance control"
Posted by james
Tue Mar 13, 2012 01:34:18 PM
very helpful...thank you so much please keep up the good work...God Bless and more power
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