This means that if you went so far as to run with no coolant, you would lose product out the vent never a good thing. Go ahead and look at the other pages before you close the Spreadsheet window. On the Variables Page, you should see three variables already defined. Choose a step size of 5 o for a nice continuous curve. For more information on the special functions and logical expressions you may use, press Function Help
That’s all we have to do for the Spreadsheet. Go ahead and look at the other pages before you close the Spreadsheet window. Now immediately, you should see we have a problem executing this plan. Perhaps, you might want to develop the habit of always making a record in the Data Recorder also part of the DataBook right before running your Case Studies. This example will build on the simulation you made for the Chemicals Tutorial Case from Chapter 4 of the Tutorials Manual.
Blissfully, unaware that we just made a mistake, let us now proceed to doing something about the Conversion. Before pushing start and you could at this pointthere is one thing I would point out to you.
Conversion as the variable go ahead and change the Variable Description at the bottom to just Conversion. However, you the boiling point of the mixture is around o F.
Case Studies Example
If you do not have such a file you may start from my version entitled ChemicalsEx. Since it is the same variable, despite the slightly different nomenclature, HYSYS will change one when it changes the other.
To shorten your simultation time enormously, open the column’s Property View. Since we will be varying the liquid volume by changing the Liquid Level percentage and we like even numbers, go ahead and change the Gutorial Volume to ft 3. Pick the Spreadsheet as the Object and B6: There are two variables called Liquid Percent: To shorten your simultation time enormously, open the column’s Property View. Now we would like to explore that reaction a little more, from a plant design stand point.
Conversion as the variable go ahead and change the Variable Description at the bottom to just Conversion. With the addition of the appropriate text, your Spreadsheet should now look like this note, if you place an import incorrectly you must delete it from the Connections Page or using the secondary mouse button menu:.
First we need the Molar Flowrate of Propylene Oxide entering the reactor. We will need two more variables: You’ll probably need to change the basis from Mole Fractions to Mole Flows.
case study in hysys
Begin by adding a Spreadsheet to the simulation on the Object Palette. Hint, hint, wink, wink, nudge, nudge.
First we need the Molar Flowrate of Propylene Oxide entering the reactor. Choose a step size of 5 o for a nice continuous curve. When you begin, your PFD should look approximately like this. Since the general rule goes, the bigger the piece of equipment, the more expensive it is, we’d like to see how sensitive the reaction is to the size of the reactor.
Yep, Conversion is nowhere to be found on that list of Variables. In general tutoroal is a good idea to be aware of your settings before running a case study as the Case Study will not return you to your original state afterwards. On the Parameters Page, checkmark the box that says Ignore hyysys during calculations. When you begin, your PFD should look approximately like this. Perhaps, you’ve noticed our first problem.
Where the sensitivity runs only solve as much of the flowsheet as they need to to get all the dependent variables, Case Studies in HYSYS apparently solve the entire flowsheet every time.
Well just in case you didn’t, the example consisted of using a CSTR to react Propylene Oxide with Water to make Propylene Glycol, then separating that out as a product. On the Worksheet Page, you can see that currently the entire hyxys of the reactor are exiting via Reactor Prods Reactor Vent has zero flow at o F. To shorten your simultation time enormously, open the column’s Property View. Even though the vent is nominally empty, we need to include it on the off chance that some of the reactor contents do become vapourized.
Later, I would come yysys and it would work just fine from then on, but I recommend saving your work before ever trying that, just in case.
Now press Start on the Case Study.