we are using honey well flame scanner P/N261A812P012 for MarkVIE. But this scanner is not good for diesel fuel operation. I believe GE recommends to use Geiger-Mueller scanner. Has anybody knows the Geiger-Mueller Part number for MarkVie flame scanner.

 

If you're having problems with flame detection it's likely that something other than the style of flame detection is the real problem. Are you having problems detecting flame during firing? Or at other times? What kind of combustion system does the turbine have (conventional or Dry Low NOx)?

When did this problem start?

Honeywell manufactures flame sensors (detectors) that employ the Geiger-Mueller style of UV flame detection. This method of flame sensing has been commonly used for decades in the power generation industry in boilers as well as combustion turbines.

You can purchase the Reuter-Stokes Flame Trackers, which use SiC (Silicon-Carbide) technology for flame detection. These flame sensors do not require 335 VDC for operation; they are two-wire, 4-20 mA devices. (GE owns Reuter-Stokes.)

Most GE-design heavy duty gas turbine control systems for liquid fuel-fired units (diesel; naphtha; heavy fuel oil; etc.) have always used Geiger-Mueller style flame sensors, mostly manufactured by Honeywell, and have so successfully for decades, regardless of the version of Speedtronic used to control and protect the unit.

 

Thanks CSA.

We have the conventional combustion chamber and Frame5 GT. Now we are retrofiting the control with MarkVie. But the flame scanners are the same. I was wondering does the same scanner will work in MarkVie. We have noticed that the flame detection is good on Natural gas fuel and flame detection is poor in diesel fuel. This is my worry. In diesel fuel during firing and acceleration it is ok. But when we reach FSNL and fsr cuts back, flame detectors goes out and trips on flame loss.

 

Yes; the Geiger-Mueller style, Honeywell flame detectors will work fine with the Mark VIe.

It sounds as if the acceleration rate is excessive and when you are nearing FSNL that FSR gets cut back excessively and causing the low flame intensity/indication. This is something which can be looked at during commissioning. If flame intensity/indication is good at other times while firing on diesel, then it would seem it's not the type or manufacturer of flame detection but something with the way the fuel is being "chopped off".

 

Thanks CSA,

Honeywell flame detector is fine. But the issue is flame level is different in both scanners. One is 600 Hz and the other only 300 Hz on 75% load. This is the same in other Frame 5 unit also. What could be reason for this? How can we correct this.