Tutorial chemcad

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  • Publicado : 22 de enero de 2011
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Table of Contents

Welcome to the CHEMCAD TUTORIAL! 2
HOW TO USE THE MOUSE 3
A DESCRIPTION OF THE TUTORIAL PROBLEM 3
GETTING STARTED 4
STARTING A NEW JOB – THE SIMULATION WINDOW 5
SELECTING ENGINEERING UNITS 7
DRAWING THE FLOWSHEET 7
PUTTING STREAMS ON THE FLOWSHEET 12
SELECTING COMPONENTS 14
SELECTING THERMODYNAMIC OPTIONS 16
DEFINING THE FEED STREAMS17
Inputting equipment parameters 19
RUNNING THE SIMULATION 21
REVIEWING THE RESULTS INTERACTIVELY 21
RE-RUNNING THE SIMULATION 25
PRODUCING A REPORT 26
GENERATING THE PROCESS FLOW DIAGRAM 29
SUMMARY 32

Welcome to the CHEMCAD TUTORIAL!

This tutorial provides basic input skills for operating CHEMCAD. CHEMCAD is a very easy program to learn, and the bestway to master it is by using it. Here we provide a step-by-step description of how to solve the condensate stabilizer problem given below. The input procedure is simple and straightforward. It is designed to be intuitive for a chemical engineer familiar with the Windows environment. However, for the sake of clarity and for those new to Windows, a review of some of the basic rules for usingCHEMCAD is given.

BASIC Steps

THE FOLLOWING TEN BASIC STEPS ARE USED TO RUN A FLOWSHEET SIMULATION IN CHEMCAD.

1. Starting a new job

2. Selecting engineering units

3. Creating a flowsheet

4. Selecting components

5. Selecting thermodynamics options

6. Defining the feed streams

7. Input equipment parameters

8. Running thesimulation

9. Reviewing the results

10. Generating hardcopy output

The steps do not have to be performed in this order nor do all of them have to be done for each flowsheet. All should be considered for each problem.

There are a series of Help facilities available throughout the program. The bottom line of the screen provides a one-sentence description of the currenthighlighted item. The Help command provides access to the On-line Manual, which contains comprehensive technical information. The [F1] key provides context sensitive help (place the cursor in a specific field and press the [F1] key). Use of these help facilities will ease your way through the program.

CHEMCAD is object oriented. Therefore, most input and editing can be done by doubleclicking or right clicking the object of the operation, as well as by using the menu commands.

All stream and unit operations specifications (input) are accomplished using dialog boxes. These dialog boxes are context specific and employ some combination of character fields, combo boxes, choice boxes and check boxes.

HOW TO USE THE MOUSE

The mouse is a very easy to use way to getthe computer to do what you want. CHEMCAD, like many Windows program, requires the use of a mouse, trackball, or similar pointing device with both a primary and secondary button (i.e. a standard Microsoft 2-button mouse). The basic Mouse techniques are summarized below:

|Click |To press and release the primary mouse button (normally the left button). ||Right-click |To press and release the secondary mouse button (normally the right button). |
|Double-click |To press the primary button twice in rapid succession. |
|Drag |To press and hold down the primary mouse button while moving the mouse. |
|Point|To move the mouse arrow until it touches the item of choice. |
|Right-click hold |Point to a specific area, then click and hold the secondary mouse button. |

USING THE KEYBOARD

• THE [TAB] KEY IS USED TO MOVE TO THE NEXT FIELD ON A DATA ENTRY DIALOG BOX.

• The [PgUp] and [PgDn] keys may be used to "page" or...
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