Clogging Of Burner Nozzles 1

[MAH82]

Dear All

The nozzels of fuel gas burners in our gas turbine have been clogged due to ingress unclean fuel gas flow through them. It seems the gas line was not enough clean and was including some particles and sands. Now, the manufacture company is commenting to remove all the burners out and clean them. This is very difficult to do for us at the bieng time because of project schedule and we are looking for a procedure that can clean the burners without take them out. we already have accomplished the reverse blow out via the cumbostion chamber pressure in full speed no load which was creating a pressure about 12 bars. It could help just little.Any comment would be appreciated.

 

[Romefu12]

MAH82
Sounds like you just answered you flame instability issue. Your fuel nozzles need to be clean, especially in DLN systems.

Romefu12

 

[TPL]

The fuel gas filters should be taking take of any particles that are the size of grains of sand. Are these functioning correctly? If not, have you considered what is happening to the particles that are not being 'caught' by the burners - they are likely going through the engine to sandblast the turbine blades, removing the protective coatings and shortening the life of some of the most expensive components in your engine and almost certainly bringing an overhaul closer.

What sort of gas turbine is this? How do you achieve reverse blow out (and what is reverse blow out?) - are you surging the compressor section?

How often do you have to change out the burners and what are the indicators that a change is required? If your engine is fitted with more than one exhaust gas thermocouple, have you tried plotting each individual thermcouple reading on a 'radar' plot and looking for changes in the profile in order to detect burner problems at an early stage?

Can you get a spare set of burners and carry out a replacement each time the turbine is down for a crank wash?

 

[abeltio]

I would be worried about insurance and warranty issues when going outside the manufacturer's recommendations.

Not following written OEM recommendations may void your insurance coverage.

saludos.
a.

 

[turbinepro]

Do you know for sure that the burners are fouled? You can use a borescope to visually confirm this condition. Are you performing a purge of the fuel lines and system between starts. Did the blow out occur during tuning/test or normal operations? Additionally, it is very common for turbine and compressor blades to rub during a reverse blow out.