control valve on condensate line after steam-water heat exchanger
control valve on condensate line after steam-water heat exchanger
(OP)
Does anyone have experience with control valve on condensate line before steam trap for steam to water heat exchanger application?





RE: control valve on condensate line after steam-water heat exchanger
RE: control valve on condensate line after steam-water heat exchanger
RE: control valve on condensate line after steam-water heat exchanger
rmw
RE: control valve on condensate line after steam-water heat exchanger
Katmar Software - AioFlo Pipe Hydraulics
http://katmarsoftware.com
"An undefined problem has an infinite number of solutions"
RE: control valve on condensate line after steam-water heat exchanger
Like you when I heard about this , it was strange for me to install control valve on condensate line after heat exchanger. in all application I have seen control valve on steam supply line to heat exchanger.
one of the supplier introduced this system that a control valve is installed on condensate before steam trap.
his argue wasthat, a control valve on the steam supply has disadvantage for condensate return, especially when the pressure within the shell of the exchanger provides the driving force for the condensate to flow back to the boiler feed-water makeup equipment.
control valve on condensate will control the level of condensate within the exchanger, which affects the effective heat transfer area, which affects the heat transfer rate.
With regard to condensate return, the pressure within the shell always is the steam supply pressure that this pressure is adequate to return the condensate to the boiler feed-water makeup.
just wanted to know if anyone has seen this system in any project and if it works fine. We don't want to experience something new especially when it comes to steam.
Thanks,
mzgh
RE: control valve on condensate line after steam-water heat exchanger
RE: control valve on condensate line after steam-water heat exchanger
1) Control valve on the steam supply side and a steam trap at the HE’s outlet
2) Control valve in the condensate return line
The two methods listed above imply a different approach in HE design process.
To go deeper on this subject I’ve taken the liberty of suggesting a couple of interesting links.
http://www.chemicalprocessing.com/articles/2008/04...
http://www.chemicalprocessing.com/articles/2008/10...
RE: control valve on condensate line after steam-water heat exchanger
RE: control valve on condensate line after steam-water heat exchanger
On the second method mentioned above, if the control valve fails shut, assuming continued flow on the tube side, the Hx would eventually flood as it continues to condense steam and then after flooding covers the tubes, stop transferring heat altogegher.
rmw
RE: control valve on condensate line after steam-water heat exchanger
Thanks,
mzgh
RE: control valve on condensate line after steam-water heat exchanger
rmw
RE: control valve on condensate line after steam-water heat exchanger
RE: control valve on condensate line after steam-water heat exchanger
To add to moltenmetal's comment above, it also allows full steam pressure (which has a temperature relationship) in the Hx rather than a reduced pressure across a control valve at the inlet, and for some Hx's or processes, that is important. But I have seen it done on steam pressure/temperatures much higher than 100C.
rmw
RE: control valve on condensate line after steam-water heat exchanger
mzgh