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- Third component – Select the component to be the third component in the ternary
system.
- Mole Frac – Specify the mole fraction for the third component (x
3
). The TPXY plot will be
generated at this fixed x
3
value.
- Show XY as actual composition– This is the default option. Check this option if you wish
to have CHEMCAD show the XY plot with the specified composition for the third
component.
- Show XY excluding 3rd component– This option allows you to have CHEMCAD show
the XY plot excluding the third component without having to delete your previous optional
specifications. Check this option if you wish to have CHEMCAD show the XY plot for the
first two components leaving your third component specifications intact.
•
Axis Mode
TPXY plots may be in mole fractions [Default] or mass fractions.
3. Residue Curve Map
Generates a triangular plot for ternary distillation calculations.
•
Enter components of interest (First component, Second component, Third component):
Select the components to be plotted using the list provided.
•
Specify Pressure
Enter pressure for phase equilibrium calculations.
•
Number of lines on each axis
Enter the number of residue curve lines per axis which will be drawn on the map. (default = 25;
10 lines total).
•
Axis Mode
Select mole fraction or weight fraction units.
•
Step Size
Enter calculation step size in selected engineering units (default = 0.02)
•
Point of interest (X1,X2) (Optional):
Enter any specific points that one of the residue curves must pass through.
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4. Binodal Plot
Generates a triangular binodal plot for examining ternary liquid/liquid equilibrium data.
•
1
st
, 2
nd
, 3
rd
Component
Select the three components to be included in the plot by using the combo boxes provided.
•
Temperature
Enter the temperature for which the plot is to be created.
•
Step Length
Indicates the step length used in binodal curve construction. Step length is entered in units of
mole fraction. [Default = 0.05]
•
Y1, Y3
It is only possible to generate a binodal plot if the first and the third components are insoluble in
each other. Y1 and Y3 are estimates of the mole fractions at which this occurs. Typically, it is
not necessary to enter these numbers. However, it may be necessary to enter values if a
message stating “the program did not converge ” is received.
•
Plot experimental data
Click here to superimpose experimental data points over the plot of the calculated values.
•
Flow Units
The binodal plot may be displayed in mole percent or weight percent.
5. Envelope
Generates a plot of the phase envelope for any stream in the flowsheet. To use this option, there
must be a stream of known composition in the flowsheet.
The program will ask you to select the stream to be plotted. It will then display the Phase Envelope
Options dialog box.
•
Estimations (optional)
Initial estimates for the starting bubble point and dew point temperatures, may be entered.
Typically, this is only necessary when the program is having difficulty converging.
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•
Vapor Fractions (optional)
To construct the phase envelope, CHEMCAD calculates bubble point and dew point
temperatures while incrementing the pressure. Once it reaches the critical point, it displays the
plot. You may force the calculation of envelopes at four additional states of vaporization. Enter
the vapor fractions for the intermediate lines.
•
Starting Pressure
Defines the starting pressure for the phase envelope (optional).
6. Heat Curves
Plots heat release curves for either stand-alone heat exchangers or for reboilers and condensers of
distillation columns. When you first select this command, the program will prompt for selection of a
heat exchanger or column. A dialog box will appear where you may set the following options.
•
No. of Points
Specifies how many points will be included in the heat curve calculation. [Default = 11]
•
Zone Cut Option
Indicates whether the zones are to be based on equal temperature, equal enthalpy increments, or
equal enthalpy between the dew and bubble points. [Default = Temp]
•
Plot Option
Select one
of the following,
Plot X-axis – DelH, Y-axis = Temp – The x-axis will be change in enthalpy and the y-axis will be
temperature.
Plot X-axis = % length, Y-axis = Temp – The x-axis will be percent of tube length and the y-axis
will be temperature.
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7. Composite Curves
By selecting a group of heat exchangers, you can generate composite heat curves, combining their
heat release curves. This allows you to examine the system for potential pinch zones. CC-
STEADY STATE first allows you to select up to fifty (50) exchangers to include in the analysis. You
are only allowed to select HTXR’s and LNGH’s. You select the equipment either by clicking it with
the mouse or by entering their ID numbers in the fields provided on the Composite Heat Curve
screen.
•
Select from graphics
A check mark in this field, permits you to select exchangers using the Select UnitOps dialog
box (appears after closing the Composite Heat Curve dialog box).
•
Zone cut option
Select whether the zones are to be based on equal temperature or enthalpy increments.
[Default = Temp]
•
Plot individual heat curve
A check mark in this field tells the program to plot individual heat curves of the equipment on
the same graph along with the composite curves.
•
UnitOps IDs
Enter the unit ID numbers for the heat exchangers you wish to include in the analysis. If you
select the unit operations graphically, then the program will fill these fields with the unit Ids the
next time you visit this screen.
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8. Properties
With this command you can obtain plots of ten properties for any stream in the flowsheet. The
stream must be fully defined. Selection is made using the Select Streams dialog box. After you
select the stream, you get the Properties Options dialog box.
•
Select a property to plot
Select one of the following entries on the screen.
•
Temperature Range
Enter the lower (T
min
) and upper (T
max
) temperatures for the properties plot.
•
No. of Points
Enter the number of points to be generated. [Default = 20]
9. Distillation Curves
Plot distillation curves for one or more streams. You can display up to 30 streams on the same plot.
To use this feature, you first select what type of distillation curve you have from the list.
The program will then ask you to select the streams to plot.
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10. Plug Flow Reactor Profile
This plot option is only available for kinetic reactors (KREA), which have been specified as PFR
(Plug Flow) reactors.
-
Plot frequency
Specify the number of points to be plotted per number of points recorded. Normally one point is
recorded per time step.
-
Composition options
Select the desired composition option for the plot. Options are:
Mole fractions
Moles
Mass fractions
Mass
Volume fractions
Volume
-
Temperature
Click here if you want the temperature profile to be plotted.
-
Select components to be plotted
Select the components to be plotted and enter the scale (factor) by which that component value is to
be multiplied before it is plotted. Leaving the scale field blank sets the scale equal to one.
11. Pipe Profile
This option plots fluid properties for pipe unit operations with multiple segments. There is no dialog
for this plot option if the # of segments in the pipe is less than two.
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12. Controller convergence
This option plots controller convergence errors as a function of controller iteration number. There is
no dialog box for this plot option other than the one asking the user to identify the relevant controller
(if necessary). The controller must have already been run and an iteration history file exist for the
program to plot this option.
13. Batch Reactor/DVSC History
Batch Reactor History
-
Time Unit – Use the combo box to choose from hours, minutes, or seconds for the x-
axis units.
-
Plot frequency - The number of points plotted per points recorded.
-
Composition Options – Open this combo box by clicking it. Choose the desired
value for the y-axis. Options are listed:
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% mole fraction
moles
% mass fraction
mass
% liquid volume fraction
liquid volume
moles/volume
rate of formation
% conversion
% selectivity
rate ratio
-
Components to be plotted – Select the component and the scale to be plotted.
-
Reactor, Jacket/Coil Options -- Each of these tabs lists variables, which can be
included in the batch reactor plot. Toggling variables on (with a checkmark) will
include them in the plot. Up to ten variables may be simultaneously plotted. You must
verify that units are consistent for all variables; otherwise the plot will not make sense.
Dynamic Vessel
-
Plot Frequency
The number of points plotted per points recorded.
-
Time Unit
Use the combo box to choose from hours, minutes, or seconds for
the x-axis units.
Open this combo box by clicking on it. Choose the desired value for
the y-axis. Options are as listed:
-
Composition Options
Mole fractions
Mass fractions
Liquid volume fractions
Mole
Mass
Liquid volume
-
Phase
Choose the phase that the above option, Composition Options,
applies to. Available options are as listed below:
Total
Liquid
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Vapor
Light liquid
Heavy liquid
-
Enter the component
to be plotted
Select the component(s) to be plotted.
-
Vessel Options
Instead of compositions, the following variable may be plotted:
Vessel temperature
Vessel pressure
Liquid level 1 (light)
Liquid volume 1 (light)
Liquid level 2 (heavy)
Liquid volume 2 (heavy)
Vapor volume
Heat duty
Utility temperature out
14. Batch Column History
•
Operation Step
Select the operation step for which to make the plot. Enter the number of the individual step
you wish to examine. If this field is empty, the program will plot a history for ALL the steps.
•
Variable to be plotted
Define the variable to be plotted on the y-axis. Select one from the pull-down list:
Mole Fraction
Reflux Ratio
Mass Fraction
Reboiler Duty
Documents you may be interested
Documents you may be interested
