an unknown event in gas turbine 1

[caemaniac]

We see that in our turbine which is running at 100 % load suddenly switches to lean-lean mode ( 20-40 % load ). Have any body seen this type of issue, or waht are the sensors that are needed to look into to diagnos this issue.

thanks

 

[abeltio]

depending on what kind of Low NOx system you have... could you give more data?

also... first thing is call the OEM... if you so require they will send a field engineer to troubleshoot the problem...
these load swings are not good for the unit at all and will damage the combustion hardware very fast.


saludos.
a.

 

[caemaniac]

The GT manufacturers are not ackn. this issue...s we have to find a solution by our self. I am tryling to get more data on Low NOX system.

 

[turbinepro]

What model-series turbine are you operating? What is the DLN series? DO you moitor combustor dynamics? when was the last mechanicaloutage and what repairs were made?

 

[irishal]

Definately need more info, but I have seen similar problems with my GT when we've had problems with our gas fuel supply -eg loss of performance heating or even a dodgy input into our gas chromatograph throws out the Wobbe index correction which deloads the GT. Send some more information.

 

[Romefu12]

Caemaniac
If you are using your terms correctly in saying "Lean Lean Mode" You have a GE Unit most likely with a DLN 2.0 or DLN 2.0+ Combustion system.

Lean Lean Mode is a diffusion mode where gas is being directed to the Primary Fuel Nozzle and the Tertiary Premix Fuel Nozzles.The Gas Turbine runs in this mode from approximately 81% speed to the engine reaches TTRF1 (combustion reference temperature) which corresponds to about 40% base load with extended turndown options and 70% base load without extended turn down options.

The unit will experience what is called a "runback" from Premix to Lean Lean if some event ocurrs in the combustion operation. DLN 2 and 2+ should be giving alarms that will acompany these events.

Can you provide details on the alarms present? Would also help to know if you are runing a Mark V or Mark VI Control as they are completely different when troubleshooting.

Romefu12

 

[caemaniac]

Hello All,

What is the maximum temperature a gas generator bearing can withstand. I believe that the gas generator bearing is for a Rolls-Royce Avon engine for industrial engine.

CAE MANIAC

 

[unclesyd]

caemaniac,

You need to start a new thread to post your question. One you start a new thread comeback and red flag this post.

Please do not hijack another's thread.