N
In 9FA gas turbine, are there any possibilities to initial excessive gas flow? What are the reason behind this? I know about 9FA, here gas fuel parameters are controlled strictly and very correctly by FSR algorithm. And also by controlling all VGC valve and also VSR valve, fuel flow is controlled accurately. I guess, if any malfunction occurs in control logic or control algorithm, valve controlling will be failed, which will occurs the excessive flow. But without this reason, what are the others factors, which may affect the fuel flow rate? like, calorific value, Gas supply pressure, Gas supply temperature ? and if VGC and SRV will fail to control amount of P2 Pressure(flow), What problems can be happened on GT ? And if really these things happen as a good operator what should do?
Another problem,In our 9FA unit, when we increase load up to base load, when it crosses around 54% load, mode change happens from piloted premixed to premixed (It is about DLN 2.0+ nozzle), I assume, that as our IBH (Bleed heating) works properly, so it is very normal. But yesterday, while we were increasing load, when we set load 110MW , suddenly mode change happens, at 93MW ( piloted premixed to premixed), within 1 minuet, it again changed to (Premixed to piloted premixed), It is very harmful for GT to frequently mode changeover. I don't know, why this happened. If anybody knows, please kindly explain. Also let me know, what factors are related to mode changeover, I mean, what condition should be maintained to successfully mode changeover? As far I know, P2 pressure, CA_CRT value, Fuel gas supply temperature. Any others factor?
As I am not so much familiar with 9FA DLN 2.0+, please help me by answering my curiosities .
Thanx a lot.
Another problem,In our 9FA unit, when we increase load up to base load, when it crosses around 54% load, mode change happens from piloted premixed to premixed (It is about DLN 2.0+ nozzle), I assume, that as our IBH (Bleed heating) works properly, so it is very normal. But yesterday, while we were increasing load, when we set load 110MW , suddenly mode change happens, at 93MW ( piloted premixed to premixed), within 1 minuet, it again changed to (Premixed to piloted premixed), It is very harmful for GT to frequently mode changeover. I don't know, why this happened. If anybody knows, please kindly explain. Also let me know, what factors are related to mode changeover, I mean, what condition should be maintained to successfully mode changeover? As far I know, P2 pressure, CA_CRT value, Fuel gas supply temperature. Any others factor?
As I am not so much familiar with 9FA DLN 2.0+, please help me by answering my curiosities .
Thanx a lot.