CONDENSATE
CONDENSATE
(OP)
Hi,
I was wondering if anybody would be able to help me with this problem?
I need to calculate the amount of condensate formed in a pipeline after shutdown?
Initial parameters:
Steam flow = 250 kg/hr
Pressure = 45 bar
Temperature = 260oC
I tried to do this in hysys. I put in a stream with the initial conditions and then put in a pipe segment to obtain the amount of condensate that has formed.
Is this approach right? Can this be modelled in dynamic simulation? Can this be done in depressurisation utility in hysys? Any suggestions would be helpful.
Thanks
svv
I was wondering if anybody would be able to help me with this problem?
I need to calculate the amount of condensate formed in a pipeline after shutdown?
Initial parameters:
Steam flow = 250 kg/hr
Pressure = 45 bar
Temperature = 260oC
I tried to do this in hysys. I put in a stream with the initial conditions and then put in a pipe segment to obtain the amount of condensate that has formed.
Is this approach right? Can this be modelled in dynamic simulation? Can this be done in depressurisation utility in hysys? Any suggestions would be helpful.
Thanks
svv





RE: CONDENSATE
Take the diameter of pipe and length of run to get a total volume. Take the volume of steam at your working pressure based on the steam tables. This will give you the weight of steam which will be weight of condensate.
RE: CONDENSATE
This is an example trying to use a computer simulation program like Hysys for a simple calculation is way overkill.
RE: CONDENSATE
You should be careful about not letting the steam condense in the pipeline because the volume of fluid inside reduces by approximately 44 times, and this may damage the pipe over a period of time. It is better to let the steam drained off.
RE: CONDENSATE
RE: CONDENSATE
How do I now calculate the amt of condensate (excess) that will form in the pipeline during startup (assuming 20 mins), when the pipeline is cold and when the same steam is pushed through the pipeline.
Can anyone point me in the right direction?
Thanks
svv
RE: CONDENSATE
A rough answer might be enough for your purposes:
Ignore the steady state heat loss throught the pipe insulation (I assume that your pipe IS insulated; if not, this approximate solution will be less correct).
You can then say (approximately) that the "excess" condensate formed at start-up is equal to the energy required to heat the mass of pipe from room temp. to the saturation temp. at 45 Bar (~255deg.C).
Calculate the mass of the piping in question
(handbook information is available for standard pipe sizes)
Add some extra for heavy valves and fittings, if they comprise a significant amount of the pipe run.
The amount of condensate = [(mass of pipe)*(thermal conductivity of pipe)*((255 - 25) deg.C)] / (latent heat of vaporization of steam at 45 bar)
RE: CONDENSATE
This is the best source to know about condensate and traps.