1 reply to this topic

[daniel düsentrieb]

Hello all together,

here I am again with brand new and bloody interesting questions I would like to pose to you guys
Thanks already in advance for discussing with me.


I am working on the dynamics of a post-combustion CO2 capture. Hower, that is not very important here. More important is the steam heated reboiler that extracts steam from the pipeline between the IP and the LP turbine of a power plant (interm. & low pressure).

Please find attached the .pdf showing the setup.


Well, let's assume the reboiler is cold and the process fluid is hanging around at 20°C (vaporization occurs at 120°C, about 2 bar in the column). When I now open the valve (not shown in .pdf) so that steam is able to flow from the location of extraction to the reboiler, what will be the pressure of steam condensation and the mass flow?

- Does the temperature of the cold process fluid have influence on the pressure of the condensing steam?
- What determines the mass flow to the reboiler? (pressure difference or rate of condensation [with pressure difference as a result])
- Is the pressure in the reboiler (condensate side) or does it change with changing process fluid temperature?
- Does the reboiler have to be evacuated from air in advance? Or put under pressure?

Could it be that the rate of condensation determines the mass flow to the reboiler and the mass flow determines the pressure of the condensing steam. The pressure at the location of extraction is kept konstant as shown in the .pdf.

Thank you for your answers and participation in this discussion.
Daniel.

Attached Files

•  setup_forforum.pdf   11.44KB   27 downloads

[Zauberberg]

There has been quite a number of topics on the subject above, including quality materials attached. Search through the forums and I bet you'll find all the answers on your questions. I remember I had participated in several such discussions.

As an introduction, look into the attached pages.

Attached Files

•  Steam Reb.pdf   69.43KB   38 downloads

Edited by Zauberberg, 27 November 2009 - 06:45 AM.