Difference between revisions of "DWSIM-3.4/C2/Rigorous-Distillation/English-timed"

|We will learn to specify '''column pressure profile'''.

|We will see where to specify '''tray efficiencies'''.

|How to open a '''simulation file''' in DWSIM  

|How to add components to a '''flowsheet'''

|How to select '''thermodynamic packages'''

|How to add '''material''' and '''energy streams''' and specify their properties.

|I have already loaded the file '''shortcut dash end dot dwxml'''.

|Press right-click on the '''Shortcut column '''and '''delete''' it.

| Go to the '''Selected Object''' window.

|Immediately after clicking it, a button appears at the right extreme;

|a button with three dots, click on it.

|Now, there is a pop-up window.

|Under the '''Feeds '''menu, click on the + (plus) button which is the '''Add '''button.

|Under '''To Stage '''column, the option is '''Condenser''' by default.

|Here, we have to specify the stage at which the '''feed''' enters.

|We can see the list of '''stages'''.

|Select the '''stage''' where we want the '''feed''' to enter the '''Distillation column'''.

|The actual connection will be done later in the '''flowsheet'''.

|Let us see it in the slide, we see the '''optimal feed location''' to be six.

|Let us go back to '''DWSIM'''.

| In a similar way, we have to pair the '''product streams'''.

|Pair the '''Condenser''' to '''Distillate''',

|pair the '''Reboiler '''to '''Bottoms.'''

| Now, we will connect '''heat duties''' to '''reboiler''' and '''condenser'''.

|Let me '''close''' this.

|It is the first option.This section is used to specify the various attributes of a '''Distillation Column'''.

|We will leave it as it is.Next is the '''Reboiler Pressure'''.

|Using this, I will show how to establish a '''linear profile''' in the '''column'''.

|Locate the '''Number of Stages''' option next.

|You have to enter the total number of '''tray'''s here.

|We plan to use a '''total condenser'''.So, this number should be one more than the equilibrium stages given by shortcut method.

|Let us go back.The next option is '''Edit Stages.''' Click it.

|It shows the '''condenser''' and '''reboiler pressures''' at 1 and 1.1 atmosphere.

|The new stages that have been added have been assigned zero pressures which is incorrect.

|We would like, infact, all the intermediates stage pressures to take interpolated values.

|Go to the left column and click the '''interpolation''' symbol at the bottom.

|For example, I will click this pressure and change it to one (1) atmosphere.

|Let me '''undo''' this by pressing the interpolated values again.

|Whenever the number of '''trays''' changes, you will have to press the '''interpolate''' button.

|For example, there could be negative '''flow rates'''.

|Remember to do this in '''Assignment 3''', at the end of this tutorial.

|One may also change the '''efficiency''' in one or more stages, as given here.

|'''Close''' this popup.

|By default, it is '''Total condenser'''.

|Under this menu, we have the type as '''Stream_Ratio ''' by default.

|Click on the '''field''' besides it.

|Enter the required '''Reflux ratio'''.

|Here we enter it as '''2'''.

|Recall that the minimum reflux ratio from the '''shortcut distillation''' was 1.47.

|Under this menu, we have the '''type''' as '''Product Molar Flow Rate '''by default.

|Change the units to '''kmol/per hour''', if necessary.

|Enter the required '''Molar flow rate'''. Here we enter it as '''61.1'''.

|11:13

|Now we will select the solution method.

|Locate the '''Solving Method''' option from the '''Properties''' tab; it is item 7.

|Click on the '''field''' besides it.

|We can see a list of '''solving methods'''.

| Now we will '''run''' the '''simulation'''.

| To do this, go to the '''calculator''' options.

|Click on the '''Play''' button.

|Now click on the '''Recalculate All''' button.

|Choose a '''stream''', for example, '''distillate'''.

|This shows all the required results like '''Condenser Duty, Reboiler Duty''' and '''Column Profiles'''.

|We can see the button appearing on the right extreme; click on it.

|Now we can see the '''pop-up''' window.

|We can see the '''temperature''' and '''pressure profile'''s,

|'''Flows''' profiles,

|'''Component flows''' and '''Component fractions'''.

|If you want to know the exact numbers, use the '''Table''' tab to the right of the '''Graph''' tab.

|Let me '''close''' this.

|Let us '''save''' this file.

| Let me summarize.

| We learnt how to simulate a rigorous '''Distillation column''',

| Specified pressure profile,

| Found out where to give tray efficiencies,

| Verify column profiles.

| Repeat the calculations for a constant '''column pressure''' of 1 atmosphere. That is, with '''reboiler pressure = 1 atmosphere'''.

| Next, simulate the '''distillation column''' at a constant pressure of 1 atmosphere. That is, the reboiler pressure also is at 1 atmosphere.

|If the '''reflux ratio''' is increased beyond 2, does the purity improve?

|Keep the '''column pressure''' constant at 1 atmosphere.

|Increase the total number of trays by 1, that is, from 15 to 16.

|As the number of trays has changed, you have to use the '''interpolate''' option.

| '''Composition of vapour flow to the condenser = distillate product composition'''.

|Compare the results.Compare the computation times.

| We have come to the end of this tutorial.

| This video summarizes the '''Spoken Tutorial''' project.

| We conduct workshops using '''Spoken Tutorials '''; give certificates. Please contact us.

|Choose the '''minute''' and '''second''' where you have the question.

|The '''FOSSEE''' team helps migrate commercial simulator labs to '''DWSIM'''.

| '''Spoken Tutorial''' and '''FOSSEE''' projects are funded by NMEICT, MHRD, Government of India.