19 replies to this topic

[jatinder]

Dear All,

 

I need your support regarding the Hysys simulation for GOR matching. I am already done with the simulation but my output stream is not showing the correct Liq. Vol. flow at st. conditions. It must be around 30,000 barrel/day but Simulations shows it around 99181 barrels/day. 

 

Process description:

 

Basically I have two streams:

 

I have a dry crude stream with component composition also including hypo component which is very clear to me. To accommodate the varying GOR of the fluids with time, the stream composition should be flashed at standard conditions and I have done it already. So after flash calculation, I obtain two streams from the flash separator. Stream 1 vaporFlash and Stream 2 LiquidFlashStream(oil).

 

Liquid Flash Stream must have a Liq. Vol. flow = 31400barrels/day and therefore I just adjust option by using the molar flow for the input dry crude stream. 

 

Vapor flash stream must have a std. gas flow of 83.5 MMSCFD and therefore I have done it by using VS option. 

 

I am done with both steps but now I am getting the problem at my output. 

 

Area of main problem.

 

These are the results from both streams

 

1. Vapor Stream - Liq. Vol. flow at st. condtions = empty barrels/day

2. Oil Stream - Liq. Vol. flow at st. condtions = 29,830 barrel/day

 

When I connect both streams using a mixer, I get my Liq. Vol. flow at st. condtions = 99181 barrels/day which does not make any sense at all as my vapor stream has no Liq. Vol. flow at st. condtions. So, the final Liq. Vol. flow at st. condtions should be around 30,000 barrels/day. 

 

Could anyone tell me that where am I doing the mistake?

 

Thank you so much in advance.

 

Regards,

 

Jatinder Singh 

 

 

[jatinder]

@Correction  - basically I have only one dry crude stream**********

[thorium90]

Would it be possible to put it here? You could put it in a zip file.

Edited by thorium90, 18 February 2013 - 08:10 AM.

[jatinder]

Would it be possible to put it here? You could put it in a zip file.

Thank you very much for your response. I think I can not upload the hysys simulation. I got an error 

[jatinder]

You can find the screenshot of the hysys simulation over here. 

Attached Files

•  untitled.bmp   1.97MB   36 downloads

[thorium90]

Yup the forums doesnt allow .hsc, but .xml or .zip is allowed

[jatinder]

Yup the forums doesnt allow .hsc, but .xml or .zip is allowed

Are you able to see the screenshot that i have added above? Thanks

[thorium90]

Yes, the picture is visible but its not enough to be able to tell why...

[jatinder]

let me make things bit easier:

 

Given

 

I have crude stream composition

pressure = 14.70 psia

temperature = 60 F

molar flow = unknown

std. Liq. Vol flow should be equal to 31400 barrels per day. Therefore I have used (A) adjust function by adding specific input target = 31400 B/day and calculated my molar flow rate. 

 

Than I have used value Set function for the same stream with 31400 b/day. 

 

In vapor stream my gas flow should be 83.5 MMSCFD and therefore I have used valueset function again to find the st. gas flow  = 83.5 MMSCFD by adding molar flow = 9170 lbmol/h

 

Now we can see that in oil stream my st. volume flow is 31400B/day and in vapor stream it is 0. So, when I add both streams by using a mixer my St. Liq. Vol flow results as 99605barrels/day which is wrong. 

 

This is the main problem

[jatinder]

Yes, the picture is visible but its not enough to be able to tell why...

let me make some remarks on the picture and I will add it again

[jatinder]

Here is the pic. again 

Attached Files

•  untitled.bmp   1.97MB   26 downloads

[thorium90]

I think the only difference is the 2 circles... LOL

I thought for 1.97mb you would have added bells and whistles to it.

 

Ok, I think I see the problem already. This example will clarify things

Attached Files

•  liquid flow.jpg   77.18KB   22 downloads

Edited by thorium90, 18 February 2013 - 09:55 AM.

[jatinder]

I think the only difference is the 2 circles... LOL

I thought for 1.97mb you would have added bells and whistles to it.

 

Ok, I think I see the problem already. This example will clarify things

Thank you very much for your efforts but to be honest with you, i didn't get your point. Could you be more specific please? Thank you

[thorium90]

Perhaps you can take a screenshot of the "conditions" and "properties" tab for the streams "Vapor" and "Oil"? Would help to confirm the reason.

Edited by thorium90, 18 February 2013 - 10:09 AM.

[jatinder]

Perhaps you can take a screenshot of the "conditions" and "properties" tab for the streams "Vapor" and "Oil"?

Yes .. here we go 

[jatinder]

@Thorium90, I have made all the screenshots

 

Please have a look 

Attached Files

•  PreFlashVap condition screenshot.bmp   774.62KB   16 downloads
•  Crude Stream condition screenshot.bmp   1.02MB   8 downloads
•  crude stream properties screenshot.bmp   1.9MB   6 downloads
•  dry crude oil condition screenshot.bmp   799.91KB   6 downloads
•  dry crude oil properties screenshot.bmp   1.86MB   9 downloads
•  main PDF screen shot.bmp   1.04MB   10 downloads
•  Oil condition screenshot.bmp   642.38KB   8 downloads
•  Oil properties screenshot.bmp   1.41MB   7 downloads
•  PreFlashLiq condition screen shot.bmp   901.81KB   7 downloads
•  PreFlashLiq properties screen shot.bmp   1.88MB   6 downloads
•  VS-2.bmp   622.29KB   6 downloads
•  PreFlashVap properties screenshot.bmp   1.95MB   5 downloads
•  Vapor condition screenshot.bmp   618.68KB   6 downloads
•  vapor properties screenshot.bmp   1.37MB   8 downloads
•  VS-1.bmp   632.07KB   8 downloads

[thorium90]

Under your "dry crude oil properties screenshot", liquid phase number 1, std liq vol flow is 3046barrel/day, liquid phase number 2, std liq vol flow is 26740barrel/day. Stream temperature 60.72F

 

3046+26740=29786barrel/day

 

Under your "Oil properties screenshot", liquid phase std liq vol flow is 29830barrel/day. Stream temperature 60.08F

 

Slight difference could be due to the temperature.(although it says std, well dont always trust simulators to give the correct answers...)

Edited by thorium90, 18 February 2013 - 11:00 AM.

[jatinder]

Under your "dry crude oil properties screenshot", liquid phase number 1, std liq vol flow is 3046barrel/day, liquid phase number 2, std liq vol flow is 26740barrel/day. Stream temperature 60.72F

 

3046+26740=29786barrel/day

 

Under your "Oil properties screenshot", liquid phase std liq flow is 29830barrel/day. Stream temperature 60.08F

 

Slight difference could be due to the temperature.

Yes exactly, I understand. But if you check the vapor and oil screenshot than vapor has no stand. liq. volume flow and only oil has liq. volume flow = 29830 barrels per day. But when I combined these both streams using a mixer that is vapor+oil, I should get my total Liq. flow around 30,000 barrels per day but i am getting around 90,000 barrels per day. That is the main problem :-(

[thorium90]

Perhaps hysys uses a different method of calculating that property because its clearly different.. The total of the liquid is just those two numbers so maybe that 90k barrels hysys uses something else to get that value.

Edited by thorium90, 18 February 2013 - 11:49 AM.

[jatinder]

Perhaps hysys uses a different method of calculating that property because its clearly different.. The total of the liquid is just those two numbers so maybe that 90k barrels hysys uses something else to get that value.

Could be possible but I would like to thank you for your efforts to help me. 

 

Thank you very much