Gas turbine compressor washing
Gas turbine compressor washing
(OP)
What is the best way to evaluate the compressor on line washing?
thanks in advance!
thanks in advance!
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Gas turbine compressor washing
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RE: Gas turbine compressor washing
Gotta show my ignorance by asking a couple of questions.
What do You mean by line washing, and what is size of the compressor?
At 74th year working on IR-One2 PhD from UHK - - -
RE: Gas turbine compressor washing
The compressor is the front half of the gas turbine. "Online washing" is done while the turbine is running - i.e. the wash fluid goes through the engine and is burned up - as compared to "offline washing" where the machine is on barring gear and the wash fluid goes to drain. Offline washing typically uses a more concentrated cleaning solution.
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If we learn from our mistakes I'm getting a great education!
RE: Gas turbine compressor washing
MW (corrected) before washing compared to MW (corrected) after washing.
Or if you have a performance package installed you could use that. Or do an eneregy balance before and after
RE: Gas turbine compressor washing
RE: Gas turbine compressor washing
To do the actual energy balance calculation is a whole different kettle of fish and is probably overkill to evaluate a water wash - you probably don't have the required instrumentation installed. (My last post notwithstanding
RE: Gas turbine compressor washing
The best way to evaluate its effectiveness is in the change in compressor efficiency and in air passing capability. Lok up the definition of "polytropic efficiency" in Marks handbook and monitor the process conditions leaving as many stages as possible, and compute before and after efficiency.
Secondly , I heard that one of the major CTG vendors has internally discoverd that their online washing proceudre and equipment may be the primary cause of compressor blade cracking, but they willnot publically admit this due to warranty issues etc.
RE: Gas turbine compressor washing
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If we learn from our mistakes I'm getting a great education!
RE: Gas turbine compressor washing
RE: Gas turbine compressor washing
Offline Water Washing can be more effective than Online Water Washing as Online Washing tends to move the dirt from the front of the compressor to the back of the compressor in some cases causing compressors to loose efficiency and approach Stall Margins quicker.
If you have the time I would recommend Offline Washing wherever possible.
Kind Regards
Romefu12
RE: Gas turbine compressor washing
RE: Gas turbine compressor washing
RE: Gas turbine compressor washing
Wonder if they make the flue gas smell nice?
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If we learn from our mistakes I'm getting a great education!
RE: Gas turbine compressor washing
I won't go into detail, but it cause lots of problems for lots of people, not least as the design was upgraded as a result, which turned out to cause more problems than it solved!! But that's another story.....
I think the answer given by 'GTSTARTUP' is the most practical approach, i.e. was for 20 minutes or so and the ambients will not have changed by much and do a compare of the results, even correcting will not be necessary in this instance, as long as you look at gross power. Finally, its important to on-line wash regularly after a compressor clean (either off-line or hand clean), as once the dirt is adhered to the blade and vanes for too long, on-line washing has minimal affect.
Good Luck.
RE: Gas turbine compressor washing
rmw
RE: Gas turbine compressor washing
Off-line washing, on the other hand, restores the performance lost from compressor fouling.
If you had two turbines side-by-side and only on-line washed one of them, you'd see a difference in compressor fouling rate.