S
Dear Sir,
Our plant configuration is two blocks. Each block consists two 9fa Gas turbines and one GE D-11 steam turbine. we are facing the problem with one block steam turbine whose output is around 5 to 6 mw less than other steam turbine.
The steam turbine which is giving less output is connected to upgraded 9fa turbines. Recently pkg 4 upgradation done for one block 2 9fa turbines means some R zero and R 11 blades changed. so these upgraded turbines can able to produce 180 MW at lesser IGV around 5 deg compared to other 9fA's which are not upgraded.
Initially it was thought less steam turbine output is because of the less heat input as IGV opening is less for upgraded units. less heat energy is available to produce steam as there is change in exhaust mass flow of around 5 to 6 kg/sec.
at base load operation upgraded GT's giving more load around 8 MW more than non upgraded GT's. however even at baseload the steam turbine output is around 5 to 7 MW less for the upgraded GT's block.
Not much difference in condenser pressure variation with other steam turbine is around 0.010 bar. and High pressure steam header flow is around 20 ton/hr less than other steam turbine.
and steam turbine with less output was feed with around the HP steam at 5 bar less than the Other non upgraded steam turbine.
than this we felt all other parameters seems same for both steam turbines.
What can be the reasons for drop in HP steam pressure inlet pressure to turbine around 5 bar compared to other?
what can be the possible reasons for reduced steam turbine power output?
I mean can you please suggest what are the main factors influencing steam turbine power output. and also suggest me the best way to troubleshoot. so that i can come up with solution. please guide me how to troubleshoot, and what parameters i must be mainly looking. so that i can make trends for various parameters. almost we are running both blocks on same load I mean all GT's are at same load.
Please some one help us in troubleshooting the loss in steam turbine output. I will follow up with you till the problem solved. one can contact me on [email protected]
Our plant configuration is two blocks. Each block consists two 9fa Gas turbines and one GE D-11 steam turbine. we are facing the problem with one block steam turbine whose output is around 5 to 6 mw less than other steam turbine.
The steam turbine which is giving less output is connected to upgraded 9fa turbines. Recently pkg 4 upgradation done for one block 2 9fa turbines means some R zero and R 11 blades changed. so these upgraded turbines can able to produce 180 MW at lesser IGV around 5 deg compared to other 9fA's which are not upgraded.
Initially it was thought less steam turbine output is because of the less heat input as IGV opening is less for upgraded units. less heat energy is available to produce steam as there is change in exhaust mass flow of around 5 to 6 kg/sec.
at base load operation upgraded GT's giving more load around 8 MW more than non upgraded GT's. however even at baseload the steam turbine output is around 5 to 7 MW less for the upgraded GT's block.
Not much difference in condenser pressure variation with other steam turbine is around 0.010 bar. and High pressure steam header flow is around 20 ton/hr less than other steam turbine.
and steam turbine with less output was feed with around the HP steam at 5 bar less than the Other non upgraded steam turbine.
than this we felt all other parameters seems same for both steam turbines.
What can be the reasons for drop in HP steam pressure inlet pressure to turbine around 5 bar compared to other?
what can be the possible reasons for reduced steam turbine power output?
I mean can you please suggest what are the main factors influencing steam turbine power output. and also suggest me the best way to troubleshoot. so that i can come up with solution. please guide me how to troubleshoot, and what parameters i must be mainly looking. so that i can make trends for various parameters. almost we are running both blocks on same load I mean all GT's are at same load.
Please some one help us in troubleshooting the loss in steam turbine output. I will follow up with you till the problem solved. one can contact me on [email protected]