K
Dear all,
I am working in PG 6551B GT 35 MW open cycle (10 combustion chambers, spark plug in 1st and 10th chamber, four flame scanners -2, 3, 7, 8). Last 20 days we are struggling to start GT.
On 20/11/2014 plant was blackout in night shift. After power resumed from grid we start our plant at normal procedure. But ignition failure happened more than 2 startup. We are using liquid fuel (LDO for startup and HFO for running) as our fuel. We people did following maintenance.
1. 2 sparks plugs checked by forcing logic L2TVX1 found normal. More than that ignition transformer input voltage checked normal &that is 115 v.
2. Four flame scanners checked. That is also found normal.
3. All 10 fuel nozzles removed and chocked nozzle by HFO cleaned and fitted again.
4. Air intake primary and secondary filters also replaced by new.
5. Water wash also done
After this we start the plant again. But again failure to ignite alarm came. Some white color smoke found in chimney after ignition failure. After this we did the following maintenance.
1. Calibrate the liquid fuel bypass valve VC3 and IGV (IGV opening and closing visually inspected). Both found normal during calibration.
2. Starting booster compressor discharge pressure checked, that is 0.1 bar. Discharge NRV also normal.
3. For clarification we checked also VA22 (isolation valve of starting booster compressor) valve open and close. Found normal.
GT started again, but we got same result-failure to ignite. After this we started following the maintenance.
1. 2 spark plugs replaced by new. After boroscope 1st and 10th chamber linear changed.
2. Startup time FSR value raised from 17.5% to 18% and started again but same result we got.
3. After this atomizing air flow checked and found normal. This time startup time FSR value changed from 18% to 16.5%,but we got failure to ignite as our result.
Maximum things we checked to start our plant. But ignition failure happening. I need your help for this problem.
mailid:[email protected]
I am working in PG 6551B GT 35 MW open cycle (10 combustion chambers, spark plug in 1st and 10th chamber, four flame scanners -2, 3, 7, 8). Last 20 days we are struggling to start GT.
On 20/11/2014 plant was blackout in night shift. After power resumed from grid we start our plant at normal procedure. But ignition failure happened more than 2 startup. We are using liquid fuel (LDO for startup and HFO for running) as our fuel. We people did following maintenance.
1. 2 sparks plugs checked by forcing logic L2TVX1 found normal. More than that ignition transformer input voltage checked normal &that is 115 v.
2. Four flame scanners checked. That is also found normal.
3. All 10 fuel nozzles removed and chocked nozzle by HFO cleaned and fitted again.
4. Air intake primary and secondary filters also replaced by new.
5. Water wash also done
After this we start the plant again. But again failure to ignite alarm came. Some white color smoke found in chimney after ignition failure. After this we did the following maintenance.
1. Calibrate the liquid fuel bypass valve VC3 and IGV (IGV opening and closing visually inspected). Both found normal during calibration.
2. Starting booster compressor discharge pressure checked, that is 0.1 bar. Discharge NRV also normal.
3. For clarification we checked also VA22 (isolation valve of starting booster compressor) valve open and close. Found normal.
GT started again, but we got same result-failure to ignite. After this we started following the maintenance.
1. 2 spark plugs replaced by new. After boroscope 1st and 10th chamber linear changed.
2. Startup time FSR value raised from 17.5% to 18% and started again but same result we got.
3. After this atomizing air flow checked and found normal. This time startup time FSR value changed from 18% to 16.5%,but we got failure to ignite as our result.
Maximum things we checked to start our plant. But ignition failure happening. I need your help for this problem.
mailid:[email protected]