and all possible exit ports for each unit operation are now marked. Required outlet ports are red; optional ports are green.Building the Flowsheet
If you are new to PRO/II, or are looking for an overview on how to set up a simulation, see Process Simulation Using PRO/II's GUI.
Adding Unit Operations to the Flowsheet
The icons and names for the unit operations appear in the PFD Palette which may be moved or resized as desired. To add a unit operation to the flowsheet, click the unit icon in the palette, move the cursor to the desired location on the draw area, and click the left mouse button. The icon for the unit will be placed on the flowsheet.
Depending on the choice provided in the Drawing Preferences Window, PRO/II assigns the selected default unit identifier or prompts you for an identifier as each unit operation is added to the flowsheet.
Adding / Connecting Streams
From the PFD Palette, push the Stream button. The cursor changes its shape to and all possible exit ports for each unit operation are now marked. Required outlet ports are red; optional ports are green.
To add a stream, click the left mouse button at the point of origin for the stream, either a unit exit port or a vacant location on the draw area for an external feed stream. Move the cursor to the desired terminus of the stream and click the left mouse button. The terminus for the stream can be a unit input port or a vacant portion of the draw area for a flowsheet exit stream. When each stream is being added to the flowsheet, all ports that are not yet satisfied are colored red, whereas the ports which are valid but satisfied are colored green.
Depending on the choice provided in the Drawing Preferences Window, PRO/II assigns the selected default unit identifier or prompts you for an identifier as each unit operation is added to the flowsheet.
Each stream added to the flowsheet is displayed in an orthogonal fashion, following a rectangular grid pattern. Thus, you need merely to define the origin and terminus for a stream; the routing will be determined automatically.
Revising Stream Connections
You may find that you want or need to change a stream connection. This may be accomplished quite easily by placing the cursor on the origin or the terminus of the desired stream, and depressing the left mouse button. Drag the end of the stream to the desired location and release the mouse button to complete the revised connection.
Note that the origin of the stream can be connected only to a product port, whereas the terminus of the stream can be connected only to a feed port of a unit operation.
As soon as a valid flowsheet has been built, i.e., all required inlet, outlet, and connector streams have been added for all the process units, the red border around the Stream button changes to black. Click the right mouse button, press the <Esc> key, or push the Stream button to change the cursor back to its original shape.
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