4 replies to this topic

[Hamidihizami]

Hi

Regarding to NGL recovery, currently I am developing and studying different processes of NGL recovery using HYSYS simulation. In the middle of my studies, I got some problems

• How to calculate ethane and propane recovery?
• What is different between ethane recovery and ethane rejection?
• How to calculate relative compression power?

All your help is highly appreciated. Thanks in advance

Regards

[Zauberberg]

Seems like you need some general information about NGL recovery processes. Have a look at:

http://www.ortloff.c...chnical-papers/

[Padmakar Katre]

Hi

Regarding to NGL recovery, currently I am developing and studying different processes of NGL recovery using HYSYS simulation. In the middle of my studies, I got some problems

How to calculate ethane and propane recovery?

This is as simple as the componet % recovery across a distilaation column i.e. recovered as a product w.r.t. original concentration in the feed.

What is different between ethane recovery and ethane rejection?

LNG is mainly sold based on the calorific value in the interational trading, ethane concentraion is kept in LNG to the extent the calorific value requirement is met. The split of the original ethane concentration is 1. ethane conc. in LNG is ethane rejection and 2. Ethane as a product is the ethane recovery.

How to calculate relative compression power?

All your help is highly appreciated. Thanks in advance

Regards

What do you mean by this term?

[Hamidihizami]

Thanks for the explaining. Basically, what I understand by relative compression is at a given horsepower level where we hold heat exchanger UA instead of minimum approach, various recovery for different NGL recovery process is captured and graph recovery vs. relative compression can be develop as I attached with this thread.

In my case, I already finished run the GSP, RSV, and RSVE simulations and now continue to achieve the same total heat exchanger UA between GSP, RSV, and RSVE so that I can compare the horsepower and recovery of NG. but I cannot achieve that. Some notes from HYSYS that math error are encounter. How to make total UA between GSP, RSV, and RSVE are same? Which part of heat exchanger need to adjust; heat exchanger at the feed or subcooler? Do I need to increase flowrate in GSP process?

I hope someone can suggest and recommend to my problem. All your help is highly appreciated

Thanks in advance

Attached Files

•  ethane recovery.jpg   200.02KB   55 downloads

[NGL Licensor]

Hamidihizami

What are the levels of recoveries you are aiming to have in the comparison process?
Each process can offer certain recovery range. Also the following can have an impact on the recovery for each selected scheme and/or licensed technology:

• Feed inlet conditions
• Presence of CO2
• Ethane rejection mode is required or not

Tell me more about your case so I can offer some help

Regards,
A.King
ngltechnology@yahoo.com
nglprocess@gmail.com