Mixers¶

Mixer¶

The Mixer is used to mix up to any number of material streams into one, while executing all the mass and energy balances.

The only calculation parameter for mixer is the outlet pressure calculation mode (outPress) variable which is of type parameter String. It can have either of the string values among the following modes:

Inlet_Minimum Outlet pressure is taken as minimum of all inlet streams pressure

Inlet_Average Outlet pressure is calculated as average of all inlet streams pressure

Inlet_Maximum Outlet pressure is taken as maximum of all inlet streams pressure

outPress has been declared of type parameter String. During simulation, it can specified directly under Mixer Specifications by double clicking on the mixer model instance.

Simulating a Mixer¶

Create a package named Mixer

Create a model named MS inside Mixer. This is to extend MaterialStream model
Extend the model MaterialStream and necessary property method from ThermodynamicPackages
extends Simulator.Streams.MaterialStreams;
extends Simulator.Files.ThermodynamicPackages.RaoultsLaw;
Create another new model named MixerSimulation
Similar to the MaterialStream example model, import ChemsepDatabase and create variables for the compounds which are to be used from ChemsepDatabase
import data = Simulator.Files.ChemsepDatabase;
parameter data.Ethanol eth;
parameter data.Methanol meth;
parameter data.Water wat;
Define variables for Number of components Nc and component array C. Also assign the variables created for the compounds to the component array
parameter Integer Nc = 3;
parameter data.GeneralProperties C[Nc] = {meth, eth, wat};
Now, create six instances of the MaterialStream model MS as we require six material streams which will go as input. To do this, open diagram view of MixerSimulation model, drag & drop MS for six times for six input streams as shown in fig. Name the instances as S1, S2, S3, S4, S5 and S6

Similarly, create amother instance of the MaterialStream model MS which will act as the outlet stream. Name the instance as S7

Now, Drag and drop the Mixer model available under UnitOperations. Name the instance as B1

Now double click on S1. Component Parameters window opens. Go to Stream Specifications tab. There are two parameter Nc and C for which the values are to be entered. As the value for Nc and C are already declared earlier in step 6 while defining the variables, these variables are passed here instead of the values. Repeat this for remaining five input material streams and the output material stream.

Now double click on B1. Component Parameters window opens. Go to Mixer Specifications tab and enter the values for parameters as mentioned below:

Nc and C can be entered same as material stream

NI represents the number of input material streams. As there are six material streams going as input, enter 6 against NI

outPress represents the pressure calculation mode for outlet material stream. Currently mixer support three different calculation mode which are inlet minimum,inlet average and inlet maximum. Here inlet average will be selected. So enter "Inlet_Average"
Switch to text view. Following lines of code will be autogenrated
MS S1(Nc = Nc, C = C) annotation( ...);
MS S2(Nc = Nc, C = C) annotation( ...);
MS S3(Nc = Nc, C = C) annotation( ...);
MS S4(Nc = Nc, C = C) annotation( ...);
MS S5(Nc = Nc, C = C) annotation( ...);
MS S6(Nc = Nc, C = C) annotation( ...);
Simulator.UnitOperations.Mixer B1(Nc = Nc, NI = 6, C = C, outPress = "Inlet_Average") annotation( ...);
MS S7(Nc = Nc, C = C) annotation( ...);
Now, connect the streams with unit operations. For this, switch back to Diagram view.
Switch to text view. Following lines of code will be autogenrated under equation section
connect(B1.Out, S7.In) annotation( ...);
connect(S6.Out, B1.In[6]) annotation( ...);
connect(S5.Out, B1.In[5]) annotation( ...);
connect(S4.Out, B1.In[4]) annotation( ...);
connect(S3.Out, B1.In[3]) annotation( ...);
connect(S2.Out, B1.In[2]) annotation( ...);
connect(S1.Out, B1.In[1]) annotation( ...);
Specify the value of pressure for all the six inlet material streams
S1.P = 101325;
S2.P = 202650;
S3.P = 126523;
S4.P = 215365;
S5.P = 152365;
S6.P = 152568;
Specify the value of temperature for all the six inlet material streams
S1.T = 353;
S2.T = 353;
S3.T = 353;
S4.T = 353;
S5.T = 353;
S6.T = 353;
Specify the value of molar flow rate for all the six inlet material streams
S1.F_p[1] = 100;
S2.F_p[1] = 100;
S3.F_p[1] = 300;
S4.F_p[1] = 500;
S5.F_p[1] = 400;
S6.F_p[1] = 200;
Specify the mole fraction of components for all the six inlet material streams
S1.x_pc[1, :] = {0.25, 0.25, 0.5};
S2.x_pc[1, :] = {0, 0, 1};
S3.x_pc[1, :] = {0.3, 0.3, 0.4};
S4.x_pc[1, :] = {0.25, 0.25, 0.5};
S5.x_pc[1, :] = {0.2, 0.4, 0.4};
S6.x_pc[1, :] = {0, 1, 0};
This completes the Mixer package. Now click on Simulate button to simulate the MixerSimulation model. Switch to Plotting Perspective to view the results.
Note

You can also find this package named Mixer in the Simulator library under Examples package.

Splitter¶

The Splitter is used to split up to a material streams into two, while executing all the mass and energy balances.

The only calculation parameter for splitter is the calculation type CalcType variable which is of type parameter String. It can have either of the string values among the following types:

Split_Ratio Mass and molar flow rate of the outlet streams are to be calculated depending on the specified split ratio

Mass_Flow Molar flow rate of the outlet streams are to be calculated depending on the specified mass flow rates of outlet stream

Molar_Flow Mass flow rate of the outlet streams are to be calculated depending on the specified molar flow rate of the outlet stream

CalcType has been declared of type parameter String. During simulation, it can specified directly under Splitter Specifications by double clicking on the splitter model instance.

Depending on the CalcType specified in the Splitter Specification, its value has to be specified through the variable Specification Value SpecVal_s. It is declared of type Real. During simulation, value of this variable need to be defined in the equation section.

Simulating a Splitter¶

Create a package named Splitter

Create a model named MS inside Splitter. This is to extend MaterialStream model
Extend the model MaterialStream and necessary property method from ThermodynamicPackages
extends Simulator.Streams.MaterialStreams;
extends Simulator.Files.ThermodynamicPackages.RaoultsLaw;
Create another new model named SplitterSimulation
Similar to the MaterialStream example model, import ChemsepDatabase and create variables for the compounds which are to be used from ChemsepDatabase
import data = Simulator.Files.ChemsepDatabase;
parameter data.Benzene benz;
parameter data.Toluene tol;
Define variables for Number of components Nc and component array C. Also assign the variables created for the compounds to the component array
parameter Integer Nc = 2;
parameter data.GeneralProperties C[Nc] = {benz, tol};
Now, create three instances of the MaterialStream model MS as we require one material stream which will go as input and two material streams which will come as output. To do this, open diagram view of SplitterSimulation model, drag & drop MS for three times as shown in fig. Name the instances as S1, S2 and S3

Now, Drag and drop the Splitter model available under UnitOperations. Name the instance as B1

Now double click on S1. Component Parameters window opens. Go to Stream Specifications tab. There are two parameter Nc and C for which the values are to be entered. As the value for Nc and C are already declared earlier in step 6 while defining the variables, these variables are passed here instead of the values. Repeat this for remaining two material streams.

Now double click on B1. Component Parameters window opens. Go to Splitter Specifications tab and enter the values for parameters as mentioned below:

Nc and C can be entered same as material stream

No represents the number of output material streams. As we have two material streams coming out, enter 2 against No

CalcType represents the calculation type specification for outlet material stream. Currently splitter support three different calculation type which are split ratio,mass flow and molar flow. Here molar flow will be selected. So enter "Molar_Flow"
Switch to text view. Following lines of code will be autogenrated
MS S1(Nc = Nc, C = C) annotation( ...);
MS S2(Nc = Nc, C = C) annotation( ...);
MS S3(Nc = Nc, C = C) annotation( ...);
Simulator.UnitOperations.Splitter B1(Nc = Nc, No = 6, C = C, CalcType = "Molar_Flow") annotation( ...);
Now, connect the streams with unit operations. For this, switch back to Diagram view.
Switch to text view. Following lines of code will be autogenrated under equation section
connect(B1.Out[2], S3.In) annotation( ...);
connect(B1.Out[1], S2.In) annotation( ...);
connect(S1.Out, B1.In) annotation( ...);
Specify the pressure, temperature, component mole fractions and molar flow rate for the inlet material stream
S1.P = 101325;
S1.T = 300;
S1.x_pc[1, :] = {0.5, 0.5};
S1.F_p[1] = 100;
Now specify the specification value for the selected calculation type in splitter
B1.SpecVal_s = {20, 80};
This completes the Splitter package. Now click on Simulate button to simulate the SplitterSimulation model. Switch to Plotting Perspective to view the results.
Note

You can also find this package named Splitter in the Simulator library under Examples package.