By pass system for steam turbine
By pass system for steam turbine
(OP)
I have to study a reducing and cooling station for a steam turbine by-pass system.
The reducing plant is controlled in pressure and temperature; it uses water, which injected at a certain temperature via spray nozzles with fixed area, to reduce the temperature of steam.
I want to understand the distance at which to put the PT 100 to measure the temperature on the reduced steam: but, for this purpose, I need to know the time necessary to evaporate the water flow completely, from the initial situation of water to the final situation of steam.
Does anybody know if exist a way to calculate this value?
Thank You very much
The reducing plant is controlled in pressure and temperature; it uses water, which injected at a certain temperature via spray nozzles with fixed area, to reduce the temperature of steam.
I want to understand the distance at which to put the PT 100 to measure the temperature on the reduced steam: but, for this purpose, I need to know the time necessary to evaporate the water flow completely, from the initial situation of water to the final situation of steam.
Does anybody know if exist a way to calculate this value?
Thank You very much





RE: By pass system for steam turbine
RE: By pass system for steam turbine
There are other correction sometimes used. If the spray water is cold condensate at 100 F , rather than heated water from the BFP at 300F, then additional transit time is needed. The measuring thermocouple should be at least 0.15 sec transit time downstream of the spray nozzle.
RE: By pass system for steam turbine
u r talking of a desuperheater, for that u need to contact the vendor for it, they would suggest the distance, as because after the desuperheater , there is a 2 phase flow for which there is a high chance of erosion of the PT if u put it near to the DS. my guess is about a dist. of 4-6m dowstream.
regards,
arup
RE: By pass system for steam turbine
steam flow= C*z*Pi/SWRT (Ti+460)(assumes linear valve characteristic)
inlet steam Hs= f( Pi, Ti)
spray Hw = constant