Our GE 7FA.03 unit has been experiencing high exhaust temperature variations during dual-fuel operations. The issue occurs primarily when switching from gas to liquid fuel, causing uneven temperature profiles across the exhaust.
Here’s what we’ve checked so far:
Fuel nozzles have been cleaned and inspected.
Combustion tuning was performed.
Purge air systems are functioning correctly.
What could be causing these temperature variations, and what steps can we take to stabilize exhaust temperatures during fuel transitions?
We had a similar issue caused by carbon buildup in the fuel nozzles. Ensure that regular cleaning procedures are being followed, especially after extended gas operations.
Look into your control system logic for fuel switchover. We’ve seen cases where delays in valve actuation caused combustion instability, leading to temperature spreads.