condenser pressure

[Adam001]

In condenser of power plants , the vacuum is created due to condensation , now if temperature change in the condenser , the pressure will change to be the saturation pressure at the new temperature , so as I understand the temperature controls the pressure in the condenser not vice versa is that true ?

 

[MortenA]

yes - as long as you have sufficient cooling

 

[Adam001]

Thank you for replying but what if I don't have sufficient cooling ? I like to hear new info

 

[racookpe1978]

?

If you do not have sufficient cooling (not enough water flow at a low enough temperature), then your "condenser" will not be able to condense all of the steam coming into the condenser. You MUST have a margin to obtain a vacuum below the turbine exhaust.

So, if you cannot maintain a vacuum, you will near-immediately begin building up pressure in the previously-a-vacuum condenser. That will - if turbine power (steam flow) is not immediately reduced, blow apart the upper walls of the condenser and expansion joint. Mechanical assemblies below the turbine are designed for vacuums. Not pressures.

Turbine performance degrades quickly as the LP blades begin moving against the backpressure of steam.

 

[EdStainless]

The turbine needs a range or pressures, all vacuum, on order to work as designed.
If the condenser pressure drops too low you will get condensation in the last stages of the LP turbine and the water droplets will destroy the blades.
There will be alarms and trips set for both high and low condenser pressure.
Condensers are designed to operate over a range of cooling water flow and temperature.
If you can't get enough water or if it is too hot then you will need to reduce generation (less steam flow) in order to keep the system in balance.

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P.E. Metallurgy, Plymouth Tube

 

[MortenA]

You can more or less find the result in a steam table. Say that you can only cool and condense the steam to 100ºC - the the pressure will be around 1 bar(a) in the condenser. As other people who know more about turbines have stated above - this may not suit your turbine.