1 reply to this topic

[Andy. W]

Hello,


I'm a first timer to the website and I've been trying to simulate an Air separation Unit on Hysys in order to acquire Nitrogen, Oxygen and Argon purity. So far i've achieve purities of 0.998%, 0.997% and 0.3% respectively, I'm finding it difficult to acquire a high % argon purity. Presently i've got, argon inlet to its Distillation Column to be 0.0164% and its outlet going through a heat exchanger and to a Storage tank.

My Question is do i use another argon distillation column which i know is gonna cost alot, or wat can i do possibly acquire a higher argon purity.

I could send a copy of the hysys simulation if needed to assist ur suggestion. Thanks as i await ur response.

[Zauberberg]

You can post the file here, or you can upload an Excel document showing basic scheme of process, including available input data and target qualities. To me, this information is not 100% clear from your previous post.

[Andy. W]

You can post the file here, or you can upload an Excel document showing basic scheme of process, including available input data and target qualities. To me, this information is not 100% clear from your previous post.

Aww, thanks for the reply. I tried to upload the hysys and its written that i'm not permitted to upload the file. I could send it in ur mail if u don't mind. Cheers.

[Qalander (Chem)]

Dear Andy Hello/Good Evening,

Probably you missed my friend Zauberberg' mentioning 'excel sheet' posting advice;

Please try again for success.

[Art Montemayor]

Andy:

Can you please supply us – on this Forum – a schematic flow sheet and a description of your proposed process in order to better understand your query and supply you with value-added recommendations?

Also, tell us the degree of your familiarity and experience with the air separation process. Presumably, you are a student and, as such, without a lot of experience on the subject except for that which you have hopefully read about. We can all profit by this input because that will enable us to know at which level of knowledge to jump in and start explaining or detailing out recommendations. It has been our experience that young engineers – particularly students – believe (or want to believe) that a simulation program is all that is needed to resolve an engineering program. This, of course is far from the truth. HySys cannot logic nor think for you. In fact, HySys has no thinking capability. It cannot devise a scheme or process that will give you the product and purity that you desire. YOU must tell HySys what process it must follow as well as what criteria it is to follow. For example, allow me to explain how pure Argon is produced from an air separation unit and perhaps it will refresh your knowledge:

The argon separation system usually consists of two basic parts:
1) a recovery subsystem, in which crude gaseous argon (GAR) is removed from crude liquid Oxygen (LOX);
2) a purification subsystem.

There are two basic types of argon-purification systems available:
a) the catalytic-combustion system; and,
b) the adsorption system.

In the catalytic-combustion system hydrogen gas is added to the argon stream and the mixture of hydrogen, argon and oxygen impurity is compressed and passed through a catalytic-combustion furnace, in which the oxygen is removed by combustion or combination with the hydrogen. The combustion process leaves only about 1 ppm by volume of oxygen, 1 %(v) hydrogen and 1 %(v) nitrogen as impurities in the argon. The water formed during combustion is removed by an adsorption dryer. The product argon is cooled by heat exchange with the incoming cold crude argon and is introduced into a rectification column to remove the final amounts of excess hydrogen and nitrogen. The final argon product can be obtained with less than 40 ppm(v) of impurities.

In the adsorption system the oxygen is removed preferentially in a fixed bed of adsorbent – usually molecular sieves – where the oxygen is removed.

I can describe all of the above in detail by using Excel and drawing a detailed, schematic flow diagram showing all the steps and flows. I will not do this at this time simply because I believe that should be your function. I hope you can now agree that what Zauberberg has requested makes a lot of sense and is a requirement in order to fully understand what you are modeling and how you have set up the simulation and be able to respond to your request intelligently.

If you are an engineering student at Nottingham, then you should know how to write the English language properly. Abbreviations, rap talk, texting, and other stylized or “mod” versions of English are difficult to interpret here and if we are to help you, we need to communicate correctly and accurately. Please identify what percentage you mean in your writings. I presume you mean volume % , but you should identify it in order to avoid confusion or errors.

Await your schematic to learn how you intend to produce pure liquid argon (LAR).

[Padmakar Katre]

Dear,
The purity of Argon and Oxygen changes vice versa if you are simulating the Air Separation as Linde's Double Column system. Argon Purity I have seen that there is inverse relation between their purities. This is not just only based on my simulation results but my operational experience of Air Separation Unit. Your argon purity seems to be quite low(?) why it is so its not getting? Further purification of Argon is possible with the reaction of Argon Stream with Hydrogen which reacts with O2(impurity in Argon Stream) to produce water and leaves pure Argon. I am uploading here the Air Separation File for Hysys Simulation.

[Padmakar Katre]

Dear All,
Problem with upload. Please whoever is interested drop me message with your mail id.

[Andy. W]

Thanks Art, Zeuberberg, Padmakar 4 d reply, Forgive my late reply cos I'm not really familiar with the website. I've been able to attach my process description on Microsoft Word because i was not able to send the Hysys Simulation. Would appreciate any further comments. Have a great week. Cheers.

And Padmakar, Thanks for your help and here is my mail

edublaze@yahoo.com

Attached Files

•  Process_Description.doc   464KB   378 downloads

[davinchi]

Hi ChemEng gurus,
I'm having problem simulating an AIr separation unit in hysys. I trying to simulate a Tonnage plant with the crude argon column and HP and LP column. Should I use Rigorous column or absorption columns?

[Padmakar Katre]

Dear,
Get one copy of the sample file i.e. Air Separation Unit in one column (Custom Column Option in Hysys) from support website of Aspen Tech. Which will guide you how to model the system.

[davinchi]

Dear,
Get one copy of the sample file i.e. Air Separation Unit in one column (Custom Column Option in Hysys) from support website of Aspen Tech. Which will guide you how to model the system.

Thanks Padmakar,
I have converged the HP column but the LP seems not to. Is there anything i might be missing

thanks and waiting for your urgent reply

[davinchi]

Dear,
Get one copy of the sample file i.e. Air Separation Unit in one column (Custom Column Option in Hysys) from support website of Aspen Tech. Which will guide you how to model the system.

Thanks Padmakar,
I have converged the HP column but the LP seems not to. Is there anything i might be missing

thanks and waiting for your urgent reply

I'd like to attach my Hysys simualtion but it's not attaching..can i send it by email?

[Padmakar Katre]

Dear,
Get one copy of the sample file i.e. Air Separation Unit in one column (Custom Column Option in Hysys) from support website of Aspen Tech. Which will guide you how to model the system.

Thanks Padmakar,
I have converged the HP column but the LP seems not to. Is there anything i might be missing

thanks and waiting for your urgent reply

I'd like to attach my Hysys simualtion but it's not attaching..can i send it by email?

Dear,
Please give me your mail id. I will send you the ASU file.

[mohamedelgheriany]

if u can send me the hysis file i will be gratefull to u

[mohamedelgheriany]

if u can send me the hysis file i will be gratefull to u

my email is elgheriany@gmail.com

[jeffreyfrog]

Hi, i have found a website that i think might help you about air separation plants

[imran.idris]

Send me the simulation.
I am also working on a nitrogen plant of Linde, and have also simulated the same. Tell me the argon purity after distillation.
Will look through your simulation and will provide the solution.

Regards,
Imran Idris
http://forums.thepetrostreet.com
imranidris@thepetrostreet.com