Saw video on 10-Aug-2024
- 1939 ABB Switzerland - 4MW gas turbine had 17.4% efficiency
- Installed by Prof Stodola
- ran till 2002
- acquired by Alstom in 2005
- V94.2 Industrial grade gas turbine with silo type combustor
- bearings: Siemens bearings of gas turbines are sealed
- Alstom bearings are accessible during operation
- Combustion can be diffusion flame or premixed flame.
- diffusion : only outer perphery of yellow flame touches oxygen. inside CH4 is unburnt.
- Premixed: CH4+O2 already thoroughly mixed, blue flame
- VIGV = to vary the air mass flow rate to control
- EGT: not enter unstable combustion zone.
- sero actuator valves pid are tuned to have one overshoot and no undershoots, used in the fuel supply lines.
- TUning of pid controllers are done at 50% open position
- in case control signal to the control valve is interrupted like cable cut, the spring loaded valve must close the line in 200 ms
- double side block and bleed are required before opening fuel gas pipelines for repair
- lvms: vibration diagonostics for insity balancing of turbines
- temperature should drop when bleed valve closes
- startup burner is diffusion burner
- run up premixed burner
- power producing turbines are of 3 manufacturers
- ge= frame 9
- siemens = v94.2
- alstom =13e2
- fame = fatty acid material esters in pipe lines that use vegetable oil attack seals of ball valves.
