simulation with each tutorial, it is highly recommended that you save your work emphasize one particular feature of Aspen that is covered in the tutorial for that. with HYSYS, as the starting point for your dynamic tutorial case. some of the basic concepts of building a simulation in HYSYS. Three. I have collected some tutorial video for our Learning purpose. You can 6-Gas Processing – LNG Fractionation Unit with Aspen hysys
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This example will build on the simulation you made for the Chemicals Tutorial Case from Chapter 4 of the Tutorials Manual.
You did complete that example, didn’t you? Hint, hint, wink, wink, nudge, nudge. 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. Now we would like to explore that reaction a little more, from a plant design stand point.
Get Started With Hysys V – Chemical Process Simulation – Community
Utility costs, and other issues, are directly tied to the temperatures we use for various operations. In this case, the temperature we set for our reactor determines how much coolant is required and has a direct effect on how well the column runs, and of course, it has a critical effect on the reaction itself.
Another big issue is Capital Costs. 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. Now we could plug about different combinations hyyss temperature and size in tutoriak hand, but what would be the point when HYSYS has so thoughtfully provided us with a tool to do just that.
Start by opening up the file you made from the Tutorial. If you do not have such a file you may start from my version entitled ChemicalsEx. When you begin, your PFD should look approximately like this.
The first thing we should do is refresh ourselves on the current conditions, so open the Reactor ‘s Property View. On the Worksheet Page, you can see that currently the entire contents of the reactor are exiting via Reactor Prods Reactor Vent has zero flow at o F.
On the Reactions Page, you can see that the current Liquid Volume is ft 3 and that the current conversion in the reactor is Since we will be varying the liquid volume by changing the Liquid Level percentage and we like even numbers, go ahead and change the Vessel Volume to ft turorial. In general it is a good idea to be aware of your settings before .73 a case study as the Case Study will not return you to your tutoriak state afterwards.
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. Go ahead and open up the DataBook now under the Tools menu. On the Variables Page, you should see three variables already defined. One of these, Reactor Tempwe will actually use ourselves. We will need two more variables: The Variables Navigator will appear.
Select Reactor from the Object List.
Case Studies Example
Perhaps, you’ve noticed our first problem. Yep, Conversion is nowhere to be found on that list of Variables. All right, we’ll worry about that in a second. Let’s go ahead and get the Liquid Percent while we are here. There are two variables called Liquid Percent: Blissfully, unaware that we just made a mistake, let tuotrial now proceed to doing something about the Conversion.
It doesn’t actually consider it a variable and heaven forbid you should actually want to use it for something. Therefore we must make our own Conversion calculation. And where do we get to make our own calculations? That’s right girls and boys, the Spreadsheet and your profs hhsys you don’t pay attention — Well, actually they complain that tutoriql don’t come to class, but that is neither here nor there.
Begin by adding a Spreadsheet to the simulation on the Object Palette. We are going to do things a little differently from the way we did things in the SET example with the Spreadsheet. Instead of importing variables on the Connections Page, we hysyw going to do it directly tutprial it may take just as long though, because of all the windows you’ll have to wade through to display the number you want. First we need the Molar Flowrate of Propylene Tutoriwl entering the reactor.
You’ll probably need to change the gutorial from Mole Fractions to Mole Flows. Now make sure the Spreadsheet Property View is on the Spreadsheet Page yes, you’ll need to push the little “pin” on the stream’s window to switch out of Modal View.
Now position your cursor over the 12C3Oxide’s Molar Flow and using the hyssy mouse buttondrag the number to cell B2 of the Spreadsheet. You should see a Bull’s Eye when you are over a place you may tutoriao it.
Oh, and make sure the Spreadsheet is also not in Modal View push the little “pin”. Even though the vent tutorkal nominally empty, we need to include it on the off chance that some of the reactor contents do become vapourized. 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:. Now, in cell B6enter the following equation: For more information on the special functions and logical expressions you may use, press Function Help The multiplier is because we wish to express the conversion as a percentage.
Speaking of which, go ahead and add for that cell the Variable Type: Percentageand the Variable Name: That’s all we have to do for the Spreadsheet. When you are finished, the page should look like it does below Note that the conversion, in red because it is a spreadsheet calculated value, is the same as we saw it on the Reactor’s Property .73.
Go ahead and look at the other pages before you close the Spreadsheet window. Pick the Spreadsheet as the Object and B6: Conversion as the variable go ahead and change the Variable Description at the bottom to just Conversion.
Switch to the Case Studies Page. Push Add to create a new Case Study.
Remember our goal is to vary the reactor temperature and reactor size done here by varying what percentage of cubic feet need actually be filled with liquid and observe the effect on the reactor’s efficiency i. Now immediately, you should see we have a problem executing this plan.
The Liquid Percent Level is not offered as an independent variable! This is the reason that that is not the variable we really wanted to use. Since it is the same variable, despite the slightly different nomenclature, HYSYS will change one when it changes the other.
Therefore, that is the variable we truly wanted. Now we are finally, finally ready to set up the Case Study normally it is not at all this much of an ordeal.
Go back to the Case Studies Page actually you might first want to make a recording on the Data Recorder Page, as that is a good habit to get into. Checkmark the reactor temperature and level as independent variables and the convesion as a dependent variable.
Now I did a little experimenting and I discovered that if allowed to run adiabatically i. However, you the boiling point of the mixture is around o F. 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. Therefore we want our maximum temperature to be less than o F.
As you shall see o F is more than sufficient for an upper bound. For a lower bound on temperature, let us take the first temperature we were given to try in the example, 75 o F. Choose a step size of 5 o for a nice continuous curve. Before pushing start and you could at this pointthere is one thing I would point out to you. If you’ve worked with Aspen, you’ve probably done Sensitivity Runs. 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.
In this case that would mean running an unnecessary column times from the Number of States in the upper right corner.
Get Started With Hysys V 7.3
To shorten your simultation time enormously, open the column’s Property View. On the Parameters Page, checkmark the box that says Ignore column during calculations. The column should turn yellow, and you may close its window. Now press Start on the Case Study. You should see a nice, pretty 3 dimensional graph of Conversion vs. You may see one, as in my graph, or even two anamalous points.
Again, I don’t know why, I’m just reporting what I saw and warning you to be aware that the data you get may possibly be buggy.
Also, though the manuals state that you should be able to delete individual points, I was unable to do so the Delete key at the bottom of the window erases the whole Case Study, so don’t try that. We’re done with the example. I recommend that you now look at the results and try to analyze why they came out as they did and play with the various 3D graph controls use the secondary mouse button over the graph to bring up the menu.
Later, I would hysye back and it would work just fine from then on, but I recommend saving your work before ever trying that, just in case. You may also want to try a two dimensional case study, Coolant Duty vs.
It’s easy, because the variables are already defined, and it’s informative. I have included this second Case Study in my file containing this completed example, CaseEx.