7 replies to this topic

[Eng.Mohamed Magdeldin]

I want to build up a simulation interface for LNG plant on hysys but i cant really figure out which fluid package to be used as the concern for the presence of the acid removal unit which i dont know does it require an amine package or can i use any normal fluid package as SKR or NRTL? and if so should i apply the amine package to the whole plant or divide the acid removal unit to a seperate interface with its seperate package??

Thanks

[Zauberberg]

Exactly. For simulating liquefaction unit, Peng-Robinson package is the recommended one. If you want to include amine (acid gas removal) unit, you will need a separate sub-flowsheet where amine package will be used and components transferred from the main flowsheet. Amine units cannot be simulated py using PR thermo.

If you are not interested in actual simulation of amine unit, you can use Component Splitter and remove any H2S/CO2/H2O from the feed gas stream prior to introducing it in cryogenic section of the plant.

[Padmakar Katre]

Dear,
The LNG train will have multiple units like Feed Natural Gas would pass thorugh a adsorbent bed for removal of mercury and other metals. Here you need to have component splitter and the outlet specification of these impurities shoud be based on the available opertaing plant sample analysis data. The outlet stream then goes to amine sweetening for removal of H2S and CO2 from feed gas. Here you can model the amine sweetening unit as a dedicated subflowsheet with the Amine Package while as the main flowsheet can have either PR/SRK (Hysys-PR is preffered) as a default Fluid Package. Then the sweet gas will go dehydration Unit if its the glycol dehydration same as sweetening unit have a dedicated subflowsheet with Glycol package else for adsoprtion you need another component splitter and outlet water spec as per the unit data. Then it goes to demethanizer/ Scrubber via propane refrigeration loop where your N2/He/C1 will be ovhd product and will go to liquifaction unit while as the bottom will go to the NGL Fractionation train for these two units you can use PR.
One thing to add on my experience in Algeria i.e. the natural gas contains helium which is not compatible with the amine package so you need to have another component splliter before it enters to amine sweetening. In general always check the components compatibility with the package you select. Hope this will help you. Waiting for your reply.

[sheiko]

I want to build up a simulation interface for LNG plant on hysys but i cant really figure out which fluid package to be used as the concern for the presence of the acid removal unit which i dont know does it require an amine package or can i use any normal fluid package as SKR or NRTL? and if so should i apply the amine package to the whole plant or divide the acid removal unit to a seperate interface with its seperate package??

Thanks

Hello,

As far as i know there is an option in the property package screen that allow HYSYS to propose you the best available package for your application.
You can also send an email to HYSYS support with you flowsheet. They will propose you some thermo packages....

[Skyline]

Guys, I'm wondering wheteher there is a general guide to choose the fluid package for a given components. If you have it, i would like to know it. Sometimes I just don't know which fluid package to use.
Thank you very much. I'd really appreciate your help.

[Padmakar Katre]

Guys, I'm wondering wheteher there is a general guide to choose the fluid package for a given components. If you have it, i would like to know it. Sometimes I just don't know which fluid package to use.
Thank you very much. I'd really appreciate your help.

Dear,
I will recommend you to go through the documentation of the concerned simulator which you are going to use as far as selection of the theromodynamic fluid package. While peroforming the simulations use of thermo methods plays key role or infact choosing wrong therom methods will lead to absurd or unrealistic results. While preparing the models of any unit keep the information handy like the components, temp and pressure range through your flowsheet and the data base for the basic properties like acentricity, Pc,Tc and dipole moments while working with the EOS. BIPs while working with the activity coefficient methods. Hope this could help you a little.

[Wan Zhi]

Hi All,

I am doing sweetening gas unit in a LNG plant but the problem there is not amine, Kent-Eisenberg thermodynamics or any other recommended package mentioned before. Is there any other fluid package that I can use?

[Padmakar Katre]

Hi All,

I am doing sweetening gas unit in a LNG plant but the problem there is not amine, Kent-Eisenberg thermodynamics or any other recommended package mentioned before. Is there any other fluid package that I can use?

Dear,
Which simulator you are using and the way you present your quesry is really confusing. Mr. Zauberberg has alrady mentioned in his post regarding simulation of the sweetening unit could be done by using a component splitter in absence of the amine package still why confusion over the this topic.