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from the gas turbines department...
stall and surge
Engineering and workplace issues. topic
Posted by new user on 28 April, 2007 - 5:07 pm
hi
I would like to know about the difference between the stalling and surging of the axial flow compressor in turbines.

1)The IGV s serve to protect from surging.
2) the Ilnet bleed heating and the compressor bleed valves are used for preventing from stalling.

I would like to have my doubt clarified.
Thanks in advance


Posted by markvguy on 29 April, 2007 - 11:15 am
There is an excellent resource on the World Wide Web known as Wikipedia. If one Googles "compressor+stall", the very first listing is the Wikipedia definition of combustion turbine compressor stall, and it mentions compressor surge in the first sentence or two.

http://www.wikipedia.org--one of the only things it lacks is a decent, understandable definition of Droop Speed Control/Governor Mode....

When a "generic" GE-design heavy-duty gas turbine is at rated speed, the IGVs (Inlet Guide Vanes, or Modulated Inlet Guide Vanes) are used to control the air flow through the unit ("generic" as in a unit without DLN (Dry Low NOx) combustors). This is usually done to limit combustor pulsations and/or to maximize exhaust temperature (for Combined Cycle operation).

The compressor bleed valves are used to protect the compressor during start-up and shutdown--below rated speed.

Inlet Bleed Heat is used to protect the compressor during operation with the IGVs less than approximately 57-62 DGA (DeGrees Angle)--which is usually only done on DLN combustor-equipped units. Some--NOT all--units with Inlet Bleed Heat also have Anti-Icing Control which is used to protect the inlet against iding through the use of the Inlet Bleed Heat system.

markvguy

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