ge reverse flow startingand loading
ge reverse flow startingand loading
(OP)
We have retrofitted 2 300 mw ge turbines to reverse flow turbines with a bypass system, and only got the old SALI charts for a foward flow turbine fron GE, IE:The predicted steam block calculates steam temp after the stop valve bypass and nozzle blocks wereas we roll on the intercepts,Does anyone have something more current?





RE: ge reverse flow startingand loading
I don't Know what a reverse flow design is, but if you are rolling with hot reheat pressure, I have to believe another valve other than the IVs are controlling steam flow. the steam conditions (temperature)being applied to the RH rotor will need to be controlled to also limit the amount of mismatch temperture
RE: ge reverse flow startingand loading
It had a Sulzer 100% Bypass system composed of HP and LP bypass valves and 100% flow capacity compact coolers for both main and reheat steam. The unit could take a full load rejection and the when the unit rpm returned to synchronous the Intercept on one side would begin to open to control and maintain synchronous speed...when the generator reconnected the station was in island mode (no external system load) the emergency diesel would stop... all in about 15 minutes as I recall. The Intercept valve was the controlling valve.
Also, when GE closed its Lynn Mass facility, they had let go all the controls test personnel. The last MkIII system to ship (for Talkha, Egypt combined cycle station) was not tested and I was asked to do testing on these last two systems. I was surprised when I got there and saw that the control valve circuit had 3 separate ramp curves and that there was only one control valves for each turbine AND that the control valve was a intercept valve from a cancelled order sitting on the shelf. If it can be done, they'll usually do it before losing money. The Intercept valve size and flow characteristics required the special control ramps to make linear steam flow for the 100mw steam turbine in a combined cycle configuration with sliding pressure control.
ps: Have not seen a reverse flow turbine...have seen reversing stages for marine applications though...???
RE: ge reverse flow startingand loading
I found ger4201 on line that implies that the unit is rolled with IP steam and steam is reversed through the HP to keep it cool.
Back in MY days, I had to go to Salam to factory test the last Schenectady MIIA
RE: ge reverse flow startingand loading
RE: ge reverse flow startingand loading