Exhaust Spread High

A

Thread Starter

ahmedaj

Dear All

We have Issue with GE frame 9e gas turbine. when we operate it on Gas fuel, The Exhaust spread increasing and exceed the allowable on 20 MW.
But when we operate it on Liquid Fuel LDO all the spread its ok.

the spreads value on 20 MW on Gas fuel
spread 1 40
spread 2 38
spread 3 37

the spreads value on 20 MW on LDO fuel
spread 1 10
spread 2 9
spread 3 8
 
ahmedaj,

Gas fuel flows out of different passages and orifices on the fuel nozzle assembly than liquid fuel.

The most common cause of high exhaust temperature spreads ON ANY FUEL is plugged fuel nozzle orifices. It's most likely the gas fuel nozzle orifices of one or more fuel nozzle assembles is plugged or restricted--or has become loose.
 
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