3 replies to this topic

[MrSimple12345678]

Hello , Good day everybody, I am doing a project on HYSYS. Thanks for looking into the thread hopefully I could get a few insights and experience of anybody!  I just added methanol into the feed stream and the curve became as such shown below. The composition is very mild. Also, I heard inhibitors shifts the hydrate curve to the left, but not changing its shape so drastically. 

 

 

I'm wondering if anybody came across such phenomena, please advise! Hope to hear from you soon! Any type of inputs are greatly welcomed!

 

Warmest Regards!!

[mattb]

for hydrates I adopt a different software (Prode Properties) but I do not remember such kind of curves,

normally you get accurate results up to 60-80%  methanol / water fraction,

with Prode Properties you can compare the (incipient formation) curve

with the result of the multi phase flash and that gives some possibility to identify wrong solutions

(which may happen with all software) 

[cea]

You may refer "Offshore world" Oct-Nov. 2012 issue, title "Estimation of Hydrate Inhibitor Requirement (Methanol) by GPSA method over HYSYS". (www.oswindia.com/archives.html)

Edited by cea, 31 March 2016 - 01:16 AM.

[MrSimple12345678]

Thank you @Mattb and @cea for you suggestions. I would like to ask another question. Lets say if I calculated for MEG using hammerschidmt equation to be W = 31%, does it mean that it is 31% of E-Glycol and 69% Water??. The temperature depression I needed was 19 deg celsius hence I ended up with 31% of wt needed.  If I had set my flow rates to be say..... 10000kg/hr, is it safe to assume that 31% of 10000kg/hr is E-Glycol  while the rest is water? I round up the amount of MEG to do costing. Please advise! Thank you very much!