Condensate Flow Through a Vertical Riser
Condensate Flow Through a Vertical Riser
(OP)
Hello,
Does anyone have experience with this? Here's my situation:
We design a power facility which utilizes geothermal steam, which contains about 23% w. of non-condensable gases (mostly CO2). Steam enters to a kettle reboiler and condensed. The two-phase flow of condensate + steam/NCG at the kettle reboiler outlet is separated into a two-phase separator, when condensate is fed to a condensate preheater(see attached sketch). At the reboiler outlet conditions (pressure and temperature) condensate is at equilibrium with non-condensable gases (NCG),based on my estimation, the condensate contains about 0.15% w. of NCG , which is completely soluble into condensate. Due to the layout limitations we have to design the condensate pipeline to the preheater as a vertical riser(elevation about 5 m). As results of the elevation/friction losses, the condensate is flashed along the pipeline and part of the NCG is released. Based on my estimation, the concentration of the "free" NCG/Steam into the condensate pipeline is about 5%vol.
My question is: Should I be concerned from any flow problems(vapor locks, flow restriction and pipe vibration) through the vertical condensate pipeline, which contains about 5%vol. of free gas?
Thanks in advance, Mike
Does anyone have experience with this? Here's my situation:
We design a power facility which utilizes geothermal steam, which contains about 23% w. of non-condensable gases (mostly CO2). Steam enters to a kettle reboiler and condensed. The two-phase flow of condensate + steam/NCG at the kettle reboiler outlet is separated into a two-phase separator, when condensate is fed to a condensate preheater(see attached sketch). At the reboiler outlet conditions (pressure and temperature) condensate is at equilibrium with non-condensable gases (NCG),based on my estimation, the condensate contains about 0.15% w. of NCG , which is completely soluble into condensate. Due to the layout limitations we have to design the condensate pipeline to the preheater as a vertical riser(elevation about 5 m). As results of the elevation/friction losses, the condensate is flashed along the pipeline and part of the NCG is released. Based on my estimation, the concentration of the "free" NCG/Steam into the condensate pipeline is about 5%vol.
My question is: Should I be concerned from any flow problems(vapor locks, flow restriction and pipe vibration) through the vertical condensate pipeline, which contains about 5%vol. of free gas?
Thanks in advance, Mike





RE: Condensate Flow Through a Vertical Riser
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RE: Condensate Flow Through a Vertical Riser
b) This condensate - NCG mix appears to be cooled from 134 to 85degC from your simulation map at the condensate preheater. To enable proper operation of this preheater, noncondensibles should be vented off to prevent accumulation in this unit. No details posted on how this condensate preheater is configured.
c) Sounds like this steam- NCG mix is on the tubeside of this kettle reboiler. Why not on the shellside-that way, you avoid the need for this phase separator ?
RE: Condensate Flow Through a Vertical Riser
Thank you for your answers.
Is it possible to estimate the minimum condensate velocity (low operation mode) through the vertical riser so that gas bubbles will be swept out?
Thanks, Mike
RE: Condensate Flow Through a Vertical Riser
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RE: Condensate Flow Through a Vertical Riser
Technology is stealing American jobs. Stop H1-Bs for robots.
RE: Condensate Flow Through a Vertical Riser