Greetings all.
In the previous days I have been working on Gas Turbine. And in the next days I will be also working on steam turbine.
Our plant is Combined Cycle with 3 GTs Exhausting into 3HRSGs and the HRSGs supply One Steam Turbine. Our steam turbine is GE D11 and the control mode is IPC (Inlet Pressure Control).
There are many concepts that needs to be cleared. Unfortunately, The level of the manual is not suited for new learners. So If any one can break down the concepts, I will be more than happy.
First, Why the turbine is rolled through the IP turbine (called reverse flow)? I think the turbine will switch into foreword flow @ approximately 10 MW.
Second, During this roll up, what is happening to the control valves of HP, IP, LP?
Third, what is the deciding factor of when to switch from reverse flow into forward flow?
Fourth, what the control valves of Each Turbine (HP, IP, LP) do When Switching from reverse into forwards?
Fifth, there is something I believe called lube oil temperature hold, what does it exactly mean and why it is used?
Sixth, Can you talk and shed some light on Thermal Stress Control and Shell Expansion Control? And why there are necessary not like GAS TURBINE?
Seventh, are the control valve of HP, IP, LP controlled using position loop?
Eighth, usually I see the Steam Turbine of our plant is running on the highest load ( around 260 MW). Is this necessary?
I hope someone knowledgeable in ST like Otised can break down these concepts.
Thanks
In the previous days I have been working on Gas Turbine. And in the next days I will be also working on steam turbine.
Our plant is Combined Cycle with 3 GTs Exhausting into 3HRSGs and the HRSGs supply One Steam Turbine. Our steam turbine is GE D11 and the control mode is IPC (Inlet Pressure Control).
There are many concepts that needs to be cleared. Unfortunately, The level of the manual is not suited for new learners. So If any one can break down the concepts, I will be more than happy.
First, Why the turbine is rolled through the IP turbine (called reverse flow)? I think the turbine will switch into foreword flow @ approximately 10 MW.
Second, During this roll up, what is happening to the control valves of HP, IP, LP?
Third, what is the deciding factor of when to switch from reverse flow into forward flow?
Fourth, what the control valves of Each Turbine (HP, IP, LP) do When Switching from reverse into forwards?
Fifth, there is something I believe called lube oil temperature hold, what does it exactly mean and why it is used?
Sixth, Can you talk and shed some light on Thermal Stress Control and Shell Expansion Control? And why there are necessary not like GAS TURBINE?
Seventh, are the control valve of HP, IP, LP controlled using position loop?
Eighth, usually I see the Steam Turbine of our plant is running on the highest load ( around 260 MW). Is this necessary?
I hope someone knowledgeable in ST like Otised can break down these concepts.
Thanks