Can anyone who has used temp match to shutdown GE turbine going into an outage tell me if there is any benefit to doing this? Is there an average time frame you save? Is there a max stress on steam turbine per GE so as not to cause any damage? Can this be done as a 1on1 or do you need both GT's?Anyone have a procedure or recommendations from GE on this? Thanks 2on1 7fa's.

 

https://patents.google.com/patent/CN104747243A/en

 

Thanks and I appreciate the info. If anyone has anything to add would be great. Does anyone else shutdown using temp matching on gas?

 

Hello sir,
Sorry for my broken english

temperature matching while doing shutdown is also call "maintenance shutdown" for GE combined cycle plant.

the purpose of temp matching is to lower the exhaust gas temp from the gas turbine in order to lower the steam temp from the heat recovery steam generator.
That cool the steam turbine, much faster than let it cool down naturaly after operation.

Steam turbine expected metal temp is about 370°c instead of 595°c, immediately after shutdown

Therefore, if you need to do some maintenance on hot part of the steam turbine, you don't need to wait so long before it's cold enough for the maintenance guys to touch/unassemble it.

it's also reduced time required before being able to stop turning gear and lube oil system.

expected time gain is about 3 days.

you can monitor your steam turbine metal temp from shutdown to complety cold with and without temp matching to determine the amount of time gained for your plant