condenser higher than steam turbine?

[estatetraining]

Dear All,
What do you think if condenser higher than steam turbine? is a hard problem? what an advantage and disadvantage?

 

[byrdj]

I have not seen them yet for the STG, but that seems to be the popular design for combined plants.

From a plant design, the "side" condensor does not need a basement so the turbine pedistal does not need to be as massive.

Now for FPTs, this has been a very common design.

 

[rmw]

The steam turbine doesn't care where the condenser is and the condenser doesn't care where the steam turbine is.

As long as you have means to drain all affected areas adequately, you can put the condenser where you want it.

As ByrdJ notes, side out let and axial outlet condensers are at the same elevation as the turbine.

I can guarantee you that for some large air cooled condensers, the top of the condenser is higher than the steam turbine.

rmw

 

[estatetraining]

thanks to Mr byrdj and rmw,
but i worried can i get a vacuum (-0.7 bar)? and water (condensation) back to turbine ?

 

[byrdj]

I don't think in bar, but shouldn't that be 0.07?

The vacuum in the condensor will depend upon its design, ie size and heat transfer to handle the steam volume. there should be very little back pressure due to the connection between the LP hood and condensor. the connection should be size to handle the exhuast flow.

This connection should also be design to drain any condensation that occurs allong the way towards the condensor. there can even be several "dams" in the connection. For FPTs where the connection to the exhaust is many feet above the turbine (and over to one side), the exhaust casing has a lower section for collection of condesate with drain to the condesate hotwell. there is also a level alarm to warn if condensate is collecting there and getting close to the tips of the last stage busckets