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ChE 477 Workshop 1.Hysys Tutorial B. Joseph

This session is meant to introduce you to the use of Hysys for Steady state simulation.The objective is to get familiar with the menu bars and general principles of operation.We will study the flash separation of a mixture of acetone and water into a vapor and aliquid stream. We will study the effect of physical property models used on the results

achieved.

Using Windows xplorer create a new folder in your directory called che477. !ou will

use this directory to store your Hysysruns. Start Hysys.

"pen a new case using the menu File/New/Case. Hysys will set up a new design

case. #ive it a name using the menu File/save. !ou will be prompted for a name and

location.

When you start the simulation Hysys opens up a window called the Simulation

Basis Manager. This is where you define the $hysical property models to be used in

the simulation and the components associated with this physical property model.% called fluid ac!age&

'rom the "oolspull down menu select #references. Then choose Field unitsby

clic(ing on it once. )t should be highlighted. This specifies your preferences for unitsused in the data entry and reports. *ote that there are other tabs available. +urrentlyyou should in the varia$les ta$. The bar at the left shows the other choices available

under this tab. %Units and 'ormats&. !ou might want to inspect the other choicesavailable. When you are done inpecting close the window by clic(ing on the top rightcorner.

Babu Joseph Page 1 10/11/2014 247176618.doc

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*ext clic( the add button on the Simulation Basis Manager,enu as shown

below.

This will ta(e you to the menu of choices for property models.


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'rom this menu choose %ntoine as the Base roerty ac!ageby clic(ing on it.

*ext clic( on the Comonents Tab. This will ta(e you to the menu of components

available for the -ntoine pac(age.

"n the Match cell enter the name water. -s you type Hysys will bring up components

that match your letters. -fter you have located water highlight it and then clic( %dd

#ureto ma(e this one of the components used in your simulation.

+lose the window and then clic( on &nter Simulation &nvironment/utton. This

will put you in the #F'% $rocess 'low 0iagaram& mode. !ou can create a flowsheet on


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this screen. !ou will also see a menubar of available unit operations on the right.% +alled the ($)ect #allette&. See above diagram.

+lic( on the Separator icon from this tool bar %first one on top& and then bring yourcurson to the $'0 area and clic( once to place this unit on the flowdiagram.

*ow double clic( on this new bloc( * +,-& to open this object. This object has thefollowing tabs1 'esign/eactions/ating/0or!sheet/'ynamics. Under 0esign

we have the menu choices1 Connections * currently active as shown

a$ove1/#arameters/2ser +aria$les/Notes.

Type feed- in the )nlets list.

Type va-in the vapor "utlet box

Type li3-in the liquid outlet box.

Type 3--in the energy stream box.

*ext clic( the #arameterson the left menu bar shown above.

nter the ressure droas 23 and the Heat 'uty as 3. This creates an

-diabatic 'lash.


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*ext clic( on the 0or!sheettab and enter the feed stream conditons as shown below.


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0ouble clic( on the molar flow of feed2 % 233.333& to enter its composition. Specify thefeed composition as 43 mole5 water and 435 acetone.

That is it6 The bottom bar should turn green indicating that Hysys has enough data tocalcuate the flash unit.

*ote that the vapor stream is 27.8 lbmoles per hour.What is its composition9 !ou can clic( on the composition menu item on the left tobring up stream compositions.*ote the temperature has dropped to 2:; ' in the flash.

)sothermal flash1 -nother type of flash that is often carried out is an isothermal flash.This fixes the flash temperature and computes the heat duty instead. To do this go to the'esignTab and then select parameters again. et us specify the temperature of vapor stream as 273.What is the heat duty9*ow remove the temperature specification and change the vapor flow to 83.What is thetemperature and heat duty9How much feed should be fed to the flash drum to produce ?3 lbmoles@hr of vaporadiabatically9These exercises show the power and flexibility of Hysys. !ou can change items in bluebut only within the degrees of freedom available. When all degrees of freedom as used


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up Hysys computes the remaining variables using mass and energy balances combinedwith the equilibrium relations.

Save your wor(.

Concept of Degrees of Freeo!.

Hysys waits until it has enough data to do the calculations ie. there are no degrees offreedom left. )f you remove any specification say the feed temperature then it will not beable to do the flash calculation.

)mportance of Using the +orrect 'luid $ac(age.

We used )deal gas model with -ntoine vapor pressure equation. While this is efficient itcan lead to totally erroneous conclusions. >et us compare the compositions of the vaporstream using the -ntoine equation with a fluid pac(age that uses 2N52%Cmodel.

The results from -ntoine equation are shown below. 'or'eed A 233 lbmoles@hr ;33 ' ?3psia -diabatic 'lash.

+lose the windows and return to #F' mode. +hoose Simulation/ Basis

&nvironment.

*ow we can define a new fluid pac(age. 'irst press copy to ma(e a copy of /asisB2.!ou now have Basis,6.+lic( on Basis,6.Then clic( Ciew. Select U*)DU-+

model. +hange Capor model from deal to S.% SoaveB

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*ow close the window and change the association between 'lowsheetB'luid p(g toBasis,6 for the Case * Main1as shown below.


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This defines the property pac(age used for the ,ain flowsheet. We do not have anysubflowsheets in this simulation. /ut we can create subflowsheets and associatedifferent fluid pac(ages with each subflowsheet using this procedure.*ow eturn to Simulation &nvironment. !ou will be as(ed if you want to Hold

the calculations or to proceed with the calculations. -nswer *o so you can see theresults.

+ompare the liquid compositions. *ote that when nonideality is ta(en into account ourmodel predicts almost F5 acetone in the liquid as opposed to almost =ero 5.+hoosing 'luid $ac(age options.There is no simple way to decide which 'luid pac(age is appropriate for a givenapplication.'or a general discussion on the subject see an excellent article by +arlson.

"eport "e#uire!ents$

-nswer first three questions using -ntoine pac(age.2. What is the heat duty for an isothermal flash at ;33 ' and ;3psia9

;. What is the temperature of an adiabatic flash at ;3psia9?. What temperature is needed to vapori=e 435 of feed98. How do the above answers change when U*)DU-+ fluid pac(age is used with S

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$rint the complete Wor(boo( for the last problem. This can be done by clic(ing theWor(boo( icon on the menubar % second line from top& and then using 'ile@print option.Submit this with your report.


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