Hi Gents,
I seek your support in understanding and rectifying issues related to secondary flame scanners on GE Make 7EA Gas Turbines- Machines Installed in KSA, Cogeneration plant, ambient condition high temperatures, and less humidity. 04 UV water-cooled secondary flame scanners have a history of the issue initially with primary flame scanners showing less intensity and later with secondary flame scanners intensity issue. Recently, we changed problematic flame scanners 7S & 8S and cleaned the remaining 3S & 4S, tested their intensity above 90 %. After completion of Hot Gas path inspection, once we started the machine, before DLN (DLN-1 machine) mode transfer, secondary and primary flame scanners showed normal behavior, however, once mode transfer happened, Flame scanners 3S & 4S drastically changed from around 50 % each to 0 & 8 % respectively.
Note that we had just prior to startup performed rinsing of the machine, however, note that our same capacity machine has no such issues reported.
I seek your support in understanding and rectifying issues related to secondary flame scanners on GE Make 7EA Gas Turbines- Machines Installed in KSA, Cogeneration plant, ambient condition high temperatures, and less humidity. 04 UV water-cooled secondary flame scanners have a history of the issue initially with primary flame scanners showing less intensity and later with secondary flame scanners intensity issue. Recently, we changed problematic flame scanners 7S & 8S and cleaned the remaining 3S & 4S, tested their intensity above 90 %. After completion of Hot Gas path inspection, once we started the machine, before DLN (DLN-1 machine) mode transfer, secondary and primary flame scanners showed normal behavior, however, once mode transfer happened, Flame scanners 3S & 4S drastically changed from around 50 % each to 0 & 8 % respectively.
Note that we had just prior to startup performed rinsing of the machine, however, note that our same capacity machine has no such issues reported.