Hi everyone,
Please see the attached image. I recover gases (H2, CH4, CO) from the top of col DIST-1 at -118 degC and 7 bar. I have to bring this to room temp and ambient pressure. I also want to save energy in doing so.
In order to do so, I first installed a valve that brought the pressure down to 1 bar but also further reduced the temp of stream 404 to -125 degC. I now use a heater to simply heat this stream to 25 degC.
Does this make sense? Look at the heat duty required by heater (HX-400-2) = 6013 cal/sec.
Instead should I use other approach? For example, using this low temp stream to advantage rather than simply wasting it?
Note: I am separating a stream of gases to recover C2,C3,C4 olefins using a de-ethanizer, de-propanizer and de-butanizer type columns. The DIST-1 col is the first one in the series that will remove other gases (H2, CO, CH4) from these olefins.
Thank you,
Geetanjali