DYNSIM Training Tutorials_1-4

DYNSIM Training Tutorials DYNSIM 5.1

DYNSIM Tutorials

Company Confidential

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Table of Contents TUTORIAL 1:

Reverse Flow

TUTORIAL 2:

Drum Lev l Control

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TUTORIAL 3:

Drum Sce arios

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TUTORIAL 4:

Flowsheet Modification

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Table of Contents TUTORIAL 1:

Reverse Flow

TUTORIAL 2:

Drum Lev l Control

22

TUTORIAL 3:

Drum Sce arios

36

TUTORIAL 4:

Flowsheet Modification

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TUTORIAL TUTORIAL1

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TUTO TUTORI RIAL AL 1:

Reve Revers rse Flow

Obj Objecti ectiv ve: Ill Illus usttrate rate the the con conffigur iguration ation of a simple simple flows flowsheet heet to examin examinee rever reverse se fl flow across a valve.

Step 1  

Launch Dy sim Click on Start\Programs\SIMSCI\DSS50, and select Dynsim 5.0, which brings up the Dynsim splash screen. Use SimS SimSci ci for for both both th usern username ame and passw password ord and launch launch the applic applicat ation by clicking on the Login button.

The Dynsim interface incorporat es many of the element elementss found found in the the PRO/II PRO/II GUI, and as in a PRO/ PRO/III sim simu ulati ation, on, the the step stepss to to setup a simulation are as follows:      

Define the Units of Measure (UOM) Select components and define component slates Define a Thermodyna ic method and other default de fault methods Lay Lay down down and and def defin inee t e models and control blocks Conn Connec ectt th the blo block ckss usi usi g appropriate streams Run the simulation and monitor the dynamic behavior of the process

This example demonstrates how to model reverse flow through a valve.

Step 2 

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Create New Simulation Clic Click k Fi File an and se select lect N w and Simulation. The New Simulation dialog ox will appear and prompt for a simul tion name, use ReverseFlow as as the simulation n me and click Create. The simulation will be created in a default user directory, as foll ws:


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C:\SIM CI\DSS50\User\ ReverseFlow.s4m. Tip: All Dynsim simulation ation files files are are save saved d in in a zipped zipped forma formatt using using *.s4m extension. To unzip the file file renam renamee th extension to .zip and then open file using a co pression utility such as WinZip 

Click View\Change Toolbars\Engineer. Toolbars\Engineer.

Not Note: Ther Theree are are four four U er Profile roles under Change Toolbars. Admi access to all Dynsim capabilities whereas Operator, Instructor, differen rent permissions use of the toolbar, e.g. an Engineer role simulation and an Operator role cannot. The Operator role is used Simulators (OTS) program use a single integrated modeling enviro

Step 3

istrator role allows full nd Engineer roles have can edit and modify a or the Operator Training Tr aining ment.

Defin the Units of Measure (UM!

The The UOM UOM icon icon is deno denott d usin using ga rule rulerr icon. con. A stan standa dard rd set set of pred predee ined UOM lists are available for use with D nsim. nsim. To use a custo custom m UOM, UOM, crea create te a New UO Slate and then refer efereence an existing U M and then modify the units as needed. For this example, using SI as the refe referen rence ce UOM UOM and and chang changee Pressu Pressure re units from kPa to kPag. 

Click on , a d the New Slate button and type EngSI as as new UOM slate name, select SI as as new UO base, and then click OK.

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Highlight the ressure parameter, and double click kPa. It will pen Change Unit-ofMeasure wind w Click Custom radio button, select select the pressure new new pressure uni as kPag, and click Change. Note that check marks appear on the UOMs changed.

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Selec Components an# Define Compone t Slates

Select all the componen s needed for the entire simulation and then a cre te a components slate(s) containing all or a subset of those components to improve the computational speed. 

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Click on the component icon to define components and ther odynamics methods for the simulation. Using the Library tab select the pure component by either dragging the component fro the library to the Selected Components column or by typing the full name, alias, or the chemical formula in the Add Library Compo ent cell and clicking Add or Enter button. Add the following components Ethylene, Ethane, Propane, and IsoButane to the Selected Components list.

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The next step is to define the co ponent slates. Tip: A component slate contai s all or a subset of the Selected Components list, e.g., in the case of a cooling water stream there may only be one component i.e. water. s a result, when Dynsim calculates, for ex mple, the enthalpy of a particular stream at a particular time step, it only needs to consider those components defined in the component late resulting in faster calculation speeds. This is important for large simulation models containing large numbers of components.

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Click on the Slate tab a nd create a New Component Slate called PROC SS and click Add. Multi select all c mponents from the Selected Components list, Drag and drop Ethane, Ethylene, Propane and IsoButane to the PROCESS Component Slate list.


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Step $

Defin a Thermo#ynamic Metho#

The next step is to speci y a thermodynamic method.  

Click on the Method tab and create a New Method Slate called RK and click Add. Expand the Th rmodynamic Data tree. Right click on Equilibrium, Enthalpy, Entropy and Density an select Soave-Redlich-Kwong Equation of State for the property method. For this simulation, the components selected consist of light hydrocarbons and therefore an equation of state method such as SRK or PR is app opriate.

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Click on the Default ta and under Default Objects select PROCESS for Component Slate and SRK for Met od Slate and click OK to save and close the Co ponents and Thermodynamics wind w.


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All subsequent models laced on flowsheet will use this default component slate and thermodynamic method .

Step %

Lay Down Mo#els

Create the Flowsheet by either using the Icon Palette or the Types tab, as follows: 

Select the Icon Palette icon. This palette appears on the mai toolbar or by clicking on the View m nu and selecting it from there which displays a floating Icon Palette window contai ing streams, models and controls

Tip: Alternatively, select the Types tab on the bottom left hand corner of the screen and contains the same list of the model libraries that the Icon Palette contai s. The Types tree also includes graphical libraries for widgets, primitives, and references that are not on the Icon Palette.  

From the Icon alette, click to select a Source, move the mouse to flowsheet canvas, and then click to drop it on the flowsheet. Do the same with a Valve and a Sink. Double click o the source icon or right click and select Data Entry to bring up a Data Entry Wi dow (DEW) to configure the source.

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Note: The data entry window boxes are color-coded. Red: required data; ellow: strongly suggested optional data. f you override a Red, Yellow, or Green, the entry box will also have no color. Once all o the red and yellow data is completed, the red on the tab will change to a blue . Note: If you select the Edit ption, the Object Editor Viewer (OEV) pops-up. This window contains a super set of all he parameters associated with this Model for advanced users.  

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Enter the following data: Pressure to 3550 kPag, and Temperature to 395 K. Enter the component c mposition data: Ethylene to 3 kg-mol, Ethane to 2 kg-mol, Propane to 4 kg-mol, a d IsoButane to 2 kg-mol. Note: the molar comp sition will be normalized to 1. Click the Thermo Tab nd note that the Thermo method is SRK and the omponent slate is Process. Click OK.


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Enter the follo ing information for the Valve model, CV = 100

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Enter the following inf rmation for the Sink model, Pressure = 200 kPa .


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Step & 

Conn ct the Units Usin' ppropriate Str eams Next, connect the models using the Process Stream type. Note: here are other stream types available in Dynsim as follows:

Stream Type

Description

Process Stream

Used for connecting models from the base equipment library and represents compositional streams.

Heat Stream

Used for connecting utility exchangers to models that can have a duty associated with them, e.g., distillation column a d separator etc.

Mechanical Stream

Used for linking a mechanical drive to a model, e.g., a shaft linked to a pump or compressor.

Electrical Stream

Used for linking electrical models to process eq ipment, e.g., an electrical bus connected to a motor.

Connectors

Used for linking a signal variable to the input of a controller and the output of a controller to a final control element, .g., valve.

Note: Valid port locatio s are highlighted green.

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Note: If a big arrow remains on the flowsheet like the figure above, this mean that the stream was not properly connected. Retry connecting the stream to the equipment.

Step )

Start an#

onitor the Dynamic *eha+ior

The flowsheet is ready to run, click the start button , to load and start the simulation in the frozen state. To run the simulati n, click on the Resume button .

Once the simulation up and running, test the dynamic behavior of the system as f llows:  

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Select the Flow Rate Indicator from the References library on the Types tab to monitor the flow rate through the valve Drop the Flow Rate In icator below the valve and enter the stream nam that needs to be tracked, in this case S2. A green arrow denotes a positive flow rate in the direction specified by the stream. A red arrow denotes reverse flow.

Double click on the valve flowsheet icon to open the Valve faceplate an adjust the valve position using th slider. Set the position to 100% open and notice that the Flow Rate Indicator shows a positive flow rate in the direction of flow specifi d by the user (green arrow).


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To modify the boundary condition of the sink (i.e. pressure) without havi g to edit the parameter in the Data Entry Wind w, drop a Slider onto the flowsheet and link it to sink pressure as follows:   

Select a Slider from the Widgets library on the Types tab and drop it onto the flowsheet. Right click and select Draw Attributes. For Point Name type SNK1.PB, which is the name of the Si k followed by the parameter we wish to control. The Min/Max anges for the slider are set to 500 and 5000 kPa respectively, and the orientation is s t to vertical. Set the width and height to 100 and 300.

Before varying this par meter (Sink Pressure Boundary) remotely, cha ge its designation from STATIC to DYNA IC .

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Highlight the Sink, right click and select Edit. This brings up the Object Editor Viewer (OEV) interface Change the Point Class for the parameter PB under the Boundary Conditions to DYNAMIC and click Apply and OK.

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   

Click LF button to load the changes. Click to resume ru ning the simulation. Vary the pressure of th Sink by moving the slider. To display the exact value of the pressure at the sink, select a Point from the References library on the Types ta , place it next to the Sink block, and enter SNK1.PB for the reference variable.

Note: STATIC points are model parameters, which are normally fixed parameters for the simulation and represent hysical dimensions such as valve Cv, drum dia eter, and so on and cannot change during a simulation. DYNAMIC points are temperatures, pressures, and flows that change during t e simulation.

Step , 

Increase the pressure at SNK1 slowly by adjusting the position of the po inter on the vertical slider on the fl wsheet. As the pressure increases at the sink end, the flow rate across the valve reduces and eventually the pressure at the sink end causes reverse flow.

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To customize the flowsheet graphics such as highlighting the slider, select Types\Primitives\Rectangle and draw a rectangle around the slider then right click and select Draw Attributes and choose a fill color. Double click on the fill c lor to customize the colors Click OK to confirm t e selection. To move the primitive bjects, select the object first, move the mouse to the edge of selected object, hold d wn the left button, and move the object.

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-n#uce .e+ rse /low in the Mo#el


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Select Start\Stop to shut down the simulation. Select File\Save to sav the simulation. Select File\Close to close the simulation or File\Exit to close D ynsim. It is important to save this file before yo exit Dynsim, because it will be required in the ext tutorial.


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TUTORIAL 2

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TUTORIAL 2:

Drum

evel Control

Objective: Illustrates how to setup a simple flowsheet with a very basic control scheme. At the end of this section, the flowshe t should look similar to the image below, with a source feeding into a flash drum and a PI co troller to maintain the level in the drum at fixed value by adjusting the valve position.

Step 1

Launch Dy sim

We will start to build on the work already completed in Tutorial 1: 

Launch Dynsim, and type username and password as SimSci and SimSci. Click File\Open and select the previous simulation file ReverseFlow.s4 . to open the simulation Click File\Save As …, and give a new name LevelControl and save the ile.

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Step 2 

Click the UOM icon and make sure to select EngSI UOM created in the Tutorial 1. Close the UOM windo by clicking OK.

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Click to open the Components and Thermodynamics window. Add ew components Methane, Propane, and n-Butane under the Library Tab. Select the Slate Tab an create new slate called NATURALGAS , which contains Methane, Ethane, Propane and n-Butane. Click the Method Tab; and select SRK thermodynamic slate created pre iously.

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Define Sim lation


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Step 3

Click the Defa lt Tab; change the Component Slate from PRO ESS to NATURALGAS and keep the Method Slate as SRK and click OK.

Chan e /lowsheet Can+as

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Select the Lasso key and draw a box around the primitive rectangle object. Right click and selec the Delete from the menu. Repeat the procedure to delete Slide also.

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Click on the stream S2 to highlight it, then place your mouse pointer on the black square that covers the connection between S2 and SNK1, Disconnect ill appear. Click on the square and dra the stream away from SNK1, and then disconn ct it from SNK1. Move SNK1 to the top right hand corner of the flowsheet canva .

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Step " 

Lay Down ase 0uipment Mo#els Drop down the followi g new models on the flowsheet canvas. Unit

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Name

Attributes

Drum

V1

Configuration = Vertical, Diameter = 1.5 m, Length = 3 m, Thickness = 12.7 mm Inlet port height = 0.01 m Port Diameter = 100 mm Source Initialization Object = SRC1

Valve

PV1

Cv = 75, Time to Open & Close = 5 sec

Valve

LV1

Cv = 50, Time to Open & Close = 5 sec

Sink

SNK2

Pressure = 100 kPag

Connect the models using process streams as shown in the figure below:


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Step $ 

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Confi ure *ase 0uipment Mo#els Right click on he source SRC1 and select the Data Entry . Click on the Thermo tab, change the Co ponent Slate from Process to NaturalGas, and select External phase as two phases. Click on the B sic tab and enter the following data SRC1 Property

Specification

Pres ure

8,000 kPag

Temperature

300 K

Composition

kg-mol

Met ane

1.0

Etha e

0.5

Propane

0.3

n-Butane

0.1

Click OK to save the modifications. Right click on he sink SNK1 and select the Data Entry . Reset the pressure to 100 kPag, and click OK. Right click on he valve XV1 and select the Data Entry . On t e Thermo tab, change the Component Slate to NaturalGas. On the Actuator tab, enter 5 seconds for the time to both open and lose the valve. On the Basic tab, check the box t Calculate Outlet Properties opti n. Right click on he drum V1 and select the Data Entry . and enter the following details

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   

On the Thermo tab, sel ct SRK as the method slate and NaturalGas as the component slate. On the Feeds tab, specify that S2 is the inlet stream with a Port Height f 0.01 m and a Port Diameter of 100 m. On the Initialization Tab, list the source SRC1 as the initialization object. Right click on the valv PV1 and select the Data Entry and enter the following details:

PV1 Valve Parameter

Valve

Valve Coefficient

75 Cv

Calculate Critical Flow

Check

Critical flow Coefficient XT

0.7

Time to Open Valve

5 sec

Time to Close Valve

5 sec

Thermo Method

SRK

Component Slate

NaturalGas

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Right click on the sink SNK2 and select the Data Entry and set the boundary pressure to 100 kPag Right click on the valv LV1 and select the Data Entry enter the followi g details:

LV1 Valve Parameter

Valve

Valve Coefficient

50 Cv

Time to Open Valve

5 sec

Time to Close Valve

5 sec

Thermo Method Slate

SRK

Component Slate

NaturalGas

Step %

Lay Down ontroller Mo#el

Add a level controller for the dr m. 

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Click the Types tab an the Controls Library and select a PID controller model. Lay it down on the flowsheet canvas; name it LC1. Click OK.


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Step &

The Configure PID LC1 window pops-up. Select Level radio button and click OK

Confi ure Connectors

The measured variable i the liquid level in the drum. The manipulated v riable is the valve position .  To make the c nnection, go to the Types tab, select the Connectors library, and click Default Conne tor. Click on the drum V1 and keeping the left ouse button pressed

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drag the connector stre m to the controller LC1. Dynsim automatically efaults to which parameters are to link ased on type of controller configuration selected. Note: Always click and drag the connector in the direction of data flow, i.e. from the vessel to the controller.

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If Dynsim cannot deter ine the parameters automatically because there may be more than one, then define them manually using Parameter Assignment wind w that pops up. Select the Process Variable from the Inputs node of controller LC1 and select Level of liquid phase from the alculated Values node of the drum L1.

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Link the controller LC1output to the valve LV1 using Default Connector and drag a connector stream from the controller to the valve. In this case, controller parameter is the Output , and the val e parameter is the Open Command under the Ex ernal Inputs, which are linked automatically.


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Step ) 

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Confi ure Controller Mo#el Right click on he controller LC1 and select Data Entry. Spe ify the Action of controller to Direct (PV-SP). Provide High limit on input to 3. m and Low limit on input to 0.0 m. On the Connections tab, note that V1.L has alrea y been entered as the process variable. In the Set Point section of the connections tab, leave the Set point parameter reference equal to zero. Click OK.

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Step , Loa# Sim lation an# Specify Set oint  

Click the tart button, to load the simulation model. Double click o the controller LC1 to open the faceplate to change mode, controller output and set oint values. Specify LC1 Setpoint (m) to 1 m. Click OK to close the window.

Note: Note the controller faceplate will only appear during simulation m de. When the simulation is shutdown, double clicking on the controller, brings up DEW for the model.

Step 1 Create . ference oints  

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Click on the T pes tab and select the References library. Place low Rate Indicators under the strea s S3 and S5. S1 should already have one. Click on the Instances tab and extend the object tree all the way to XV1\External Inputs, and select OP Open Command, then drag it to the flowsheet c nvas to create the point of valve open rate XV1.OP. This displays the position of the valve as a fraction where 1.0 represents fully open valve and 0.0 represents a fully closed valve. Similarly creat valve open rate points for valve PV1 and LV1 and also add these additional points:

Point Name

Parameter

SRC1.FLASH.VF

Vapor fraction in Source SRC1

SIMSPD

Speed of simulation as a % of real time

V1.Flash.P

Pressure in the drum V1

V1.Flash.T

Temperature in the drum V1

V1.Flash.MWV

Molecular weight of Vapor in V1

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Step 11 Create Tren#s 

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Click on the icon rends, and drop it on the flowsheet canvas. Any point can be typed into the point cell or selected using the Instances tab drilling down to the point of interest and clicking th Add button. Examine the behavior f the system when V1 is depressurized. Add the rum pressure, liquid level, metal tem erature, and flash and fluid temperature to the chart for monitoring. Click Apply once to save the changes. Deselect the check marks under the Auto column and set Ymin and Yma as shown in the following picture.

Click OK and enter the Trend Name as well as the Flowsheet name with which to associate the trend as f llows:


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Step 12 Create S apshots Run the simulation and  Click on the  Click on the R  Double click o on the valve P

iew the behavior of the system. Save key to save the modifications to LevelCont rol.s4m. sume button to start the simulation. the valve XV1 and using the slider open valve 100% and double click 1 to 10% open position and let the system come a steady state condition.

Hint: To reach steady st te quickly, increase the simulation speed in the  

unning Panel.

When the system is stable, double click on the valve PV1 (if yo closed the faceplate) and open it full 100%. Observe the point references on the Depressurizing Trend

Note: Model changes ar uploaded without reloading the simulation by c licking the click the Resume utton to start again. 



and then

Wait for the si ulation to reach steady state conditions, and the save an initial condition snap hot or IC by clicking on the Snapshot butto on the tool bar and name the IC St ady State. Click Shutdown button, save, and close the simulation. This workshop answer will be required for next tutorial.

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TUTORIAL 3

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TUTORIAL 3:

Drum

cenarios

Objective: Set up and record scenarios, scenarios capture the flowsheet changes

ith time.

Step 1Launch Dynsim

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Launch Dynsim and O en the LevelControl simulation created in Tutorial 2 and click the button to start he simulation.

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After the simulation has loaded, the IC Summary icon becomes acti e. Click on IC Summary icon to bring up the IC SteadyState previously saved in Tutorial 2.


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Click on the “ um” column to highlight the IC SteadyState and click Load to restore the simulation mo el to the SteadyState condition. Click Yes whe asked Are you sure?

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Step 2 .ecor# two Scenarios The next step is to record two different scenarios. First is a depressurizing scenari . 

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Isolate the flash drum y closing all three valves (i.e. the inlet and two outlet valves). Continue to run the si ulation without changing anything for a minute f simulation time. The Depressuring trend located in the Instances tab under the FS tab, double click to open it. Display the Scenario S mmary Window by clicking on the scenario icon. Click on the button. Open the valve PV1 on the vapor outlet line from the drum slowly and atch how the trends change as the vessel depressurizes down to atmospheric pressure. Create Scenarios manu lly using a custom scripting language or record scenario as one would record a macro i Microsoft Excel. Clicking the record scenario utton changes the icon to . lick on the Stop Recording button to stop scena io recording or click the button to pause scenario recording. Pause the simulation o ce the flow rates are steady and then close the v lves to isolate the drum.


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Hint: To close the valve on the liquid outlet stream from the drum, LV1, double click on the level controller to bring up the controller’s “faceplate” within which the controller can be toggled between manual a d automatic control and specify a new set point for the controller.

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Click on “Manual” button to override the controller and manually close the valve by dragging the slider to zero.

Step 3Chec4 stea y state 

Hit the resume key and watch as the valves change color, going from green to yellow to red. llow the simulation to run for a minute of simul tion time with all the valves closed. ring up the Depressuring trend to examine the pressure, temperature and liquid level in the drum.

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Note a slight disturbance to the rum pressure and liquid level as the valves close, isolating the drum from the rest of the model.

Step " With the drum isolated and the imulation running, open PV1, the valve on the vapor outlet from the drum. Watch how the trends change as the valve moves from fully closed to f lly open.

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When the pres ure in the drum reaches atmospheric pressure, st p the scenario by clicking on the

button. Save the scenario as Depressuring Drum V1.

Dynsim will automatically bring up the script of the scenario just r ecorded which can be modified by editing the script itsel f.

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At any time review or run the re orded scenario by clicking on the

scenario ummary icon.

Step $ .ecor# blow#o n scenario The second scenario simulates blowdown of the drum V1. Restore the simul tion back to the steady state IC. icon, select “SteadyState” and hit restore. This restores and freezes the  Click on the simulation.  Resume the simulation and isolate the drum by closing all three valves. scenario icon. Click on  Display the Scenario S mmary Window by clicking on the the button.  To model a blowdown, slowly open valve LV1 after a minute of simulation time by double clicking on the C1 controller, switch to manual operation and slow open the valve by manipulating he slider.

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Observe the re ulting trend that tracks both the temperature insi e the drum and temperature of the drum wall as the blowdown occurs. Stop and save the scenario when the pressure inside the drum reaches atmospheric pressure.

Note to compare changes in metal and fluid temperature in the drum use he same Ymin and Ymax values for V1.TM and V1.Flash.T.

Step % Having saved the two scenarios they can be run at any time during the si ulation by clicking on the scenario summ ry icon, highlight the scenario and hit the “Run” key on the Scenario Summary window.

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The scenario changes from yellow to green indicating it is active and running.

Dynsim freezes the simulation a d notifies the user with a pop-up window at the nd of the scenario run.

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Shutdown the existing imulation and click on File\Save As “LevelControl2”.


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TUTORIAL 4

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TUTORIAL 4:

Flows eet Modification

Objective: This tutorial looks at how to add a pump and attach a utility exchanger to the drum in the existing simulation. When y u are finished, the model should look something like this, refer to this schematic for point references and flow indicator locations.

We would like to build on the w rk already completed in Tutorial 2.

Step 1 Define UM The UOM, the component and method slates are unchanged and there are som changes to the definition of the unit operations. 

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Make the following ch nges to the flowsheet equipment models: Unit

Name

Attributes

Source

SRC1

Pb = 8000 kPag

Valve

PV1

Cv = 300

Sink

SNK1

Pressure = 100 kPag


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Step 2  

Start the simul tion in freeze mode using the button . Open XV1 to 100% and PV1 to 50%. Unfreeze the simulation and let it run using the resume simulation.

Step 3 

Allow the simulation to reach steady state and then create a sna shot called “SS” by clicking the “Camera” icon on the Snapshot pane.

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Display the sn pshot summary window, by clicking on the Initi l Conditions Icon (Snapshots are also called Initial Conditions) saved.

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to see that the snapshot has been


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Step " 

Add a pressure controller on the drum to provide a constant suction to the pump: Unit

Name

Attributes

Controller

PC1

Action= PV-SP, High Range of Input Hi_In = 10000 kPa, Low Range of Input Lo_In = 0 kPa

Step $  

Connect the controller y dragging the Default Connector from V1 to P 1 and connect PC1.PV to V1.P. You an find V1.P under the “Calculated Values” nod . Drag the Default Conn ctor from PC1 to PV1which will connect the PV1.Op to the PC1.Out automatically.

Step %   

Press LF to load your odel changes. Resume the simulation and change make the Setpoint of PC1= 5000 kP . Save a snapshot when t he pressure lines out at 5000 kPa.

Step & 

Add a Pump between t e Drum V1 and Valve LV1 to the flowsheet Unit

48

Name

Attributes


DYNSI

Tutorials

Pump Valve Sink

Flow Curve Scale Qscale = 0.1 m /sec, Head Curve Scale DHScale = 500 m, Efficiency Curv Scale ETAScale = 0.7, Reverse Flow Factor KJR = 0, Use efault Curve = True

P1 V1 SNK2

Valve Cv = 100 Cv, Reverse Flow Factor KJR = 0 Pressure Pb = 6000 kPag

Step )  

Press LF to load your model changes. Resume simulation and make the Setpoint of PC1 = 5000 kPa. Save a snapshot when the pressure steadies out at 5000 kPa.

Step , 

Add a separate flow path for the utility exchanger: Source SRC , Valve XV2, Utility Heat Exchanger E1 (Heat Stream type) and Sink SNK3.

Unit

Name

Source

SRC2

Valve

XV2

Utility Ex

E1

Sink

SNK3

Attributes Pressure PB = 800 kPag, Temperature Composition: Methane = 0.1, Ethane = 0.2, Butane = 1 Valve Cv = 500, Reverse Flow Factor KJR = Open 20% Metal Mass MM = 5000 kg, Volume Vol2 Transfer Area = 50 m2, Constant Overall Coefficient ConstUFlag = True, Overall Coefficient U = 4 kW/m2-K

b = 500 K, ropane = 1, N, = 2 m3, Heat Heat Transfer Heat Transfer

Pressure Pb = 500 kPag

Step 1 

Drag a heat str am from the E1 to V1. Note: Connect to the flui heat stream port of V1.

DYNSIM Tutorials


49

DYNSIM Training Tutorials_1-4

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