1 reply to this topic

[ubuntu]

Hi,In the simulation with Hysys,using Utilities in the Tools box, you can choose a type and size of packing in the list,but how to customize the packing that doesn't exist in the list such as 1100Y?
Really appreciated for your answer~

Edited by ubuntu, 26 August 2010 - 07:25 AM.

[ubuntu]

I've got the answer with the help of google.
so I'd like to share it with everyone here.

How do I addmy own packing to the list in the Hysys tray sizing utility?
Adding a "user" defined packingmaterial for use in the tray sizing utility:<br style="mso-special-character:line-break"><br style="mso-special-character:line-break">

As long as the you have the requiredspecifications, you can modify the "packinfo.db" file located in theSupport directory. For example, if Hysys is installed in "c:\ProgramFiles\Hyprotech\Hysys", the file we are looking for is located in"c:\Program Files\Hyprotech\Hysys\Support". A typical entry in thepackinfo.db file looks similar to this:

PackingType BallastRing_Met1&1_2_inch
Desc "Ballast Rings (Metal) 1&1_2_inch"
SLEFactor 30
RobbinsFactor 30
Diameter 0.0381
Pieces 13000
Weight 415
Price -32767
IDNumber 0
SizeID 2
end<br style="mso-special-character:line-break"><br style="mso-special-character:line-break">

With regards to the info presented above,any units associated with the values are in internal units (i.e. SI).

The Packing Factor (SLE or Robbins) usedwill depend on the pressure drop correlation chosen.
Hysys defaults to the Robbins correlation (L. Robbins, Dow Chemical, 1991).Based on a quick glance over Robbins' paper, his contention is that Eckertcorrelates the delta P with the flooding parameter, even when the packing isessentially dry (ie. low values of L/G).
The Robbins packing factor is actually the Dry Bed Packing Factor, which isused to calculate the gas and liquid loading factors (the liq. l.f. isdependent on liquid flow rate), which are in turn used to calculate thepressure drop. The Robbins Packing factor is dimensionless.
In Field units, Fpd=2.7e8 * (rho g/.075) * deltaPpb / (G^2) where rho g is gasdensity (lb/ft3), G is the gas loading (lb/h-ft2) and delta Ppb is specificpressure drop through dry bed, (in. H2O/ft packing).
The other option is the SLE correlation proposed by Sherwood, and modified byLeva, then Eckert. The packing factor (in inverse feet) is empiricallydetermined, and is approximately the ratio: (surface area of packing per unitvolume) / (void fraction in packing)^3.
SLE Factor is in inverse feet.
The "Pieces" entry represents the number of pieces of packing/m3.
The "Weight" entry is the density in kg/m3.
Note that a value of -32767 represents an empty value.

If the customer is interested inevaluating various diameters/sizes of the same type of a certain packing, aseparate packing definition for each diameter would be required with each entryhaving the same IDNumber but a different SizeID as well as different packingtype name. If you look through the database file this should become a clearer.

Additionally, when a new packing is added,an entry(or entries) must be added at the end of the file to add the packingtype(s) to the list of tray packing available. This entry is of the form:

AddPacking BallastRing_Met1_inch<br style="mso-special-character:line-break"><br style="mso-special-character:line-break">

The last thing toensure is that you do not use Notepad (or Wordpad or Word) as a text editor.Any of these programs will convert your file to a .txt file even if you try tosave as .db (if you check the properties of the file you save it will show"packinfo.db.txt" as the file name). Instead, use the Macro LanguageEditor in HYSYS (access under "Tools" menu) to open and edit your .dbfile, then when you save it make sure you use the File Save As and choose SaveAs Type: All Files (*.*). It will remain a .db file. You can then use youredited packinfo.db in HYSYS.