giới thiệu về Aspen Plus

Aspen Plus is a market‐leading process modeling tool for conceptual design, optimization, and performance monitoring for the chemical, polymer, specialty chemical, metals and minerals, and coal power industries.

Nation Taiwan University

What is Aspen Plus

• Aspen Plus is a market‐leading process modeling tool  for conceptual design, optimization, and 

performance monitoring for the chemical, polymer,  specialty chemical, metals and minerals, and coal 

power industries.

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Ref: http://www.aspentech.com/products/aspen-plus.cfm

What Aspen Plus provides

What course Aspen Plus  can be employed for

Problem Formulation 1: Calculation  the mixing properties of two stream 

Entropy cal/mol-K ? ? ? ?

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Flash Separation

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T 115

T-x T-y

Saturated Feed

T=105 C P=1atm

What are flowrates and compositions of the two outlets?

xWater and yWater

What are flowrates and compositions of the two outlets?

xWater

• Startup in Aspen Plus (Basic Input) (45 min)

– User Interface

– Basic Input: Setup, Components, Properties.

• Properties Analysis (1 hour)

– Pure Component

– Mixtures (phase equilibrium)

• Running Simulation (1 hour)

– Blocks (Unit Operations)

– Streams (flow streams)

– Results

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Introduction to Aspen Plus – Part 1

Startup in Aspen Plus

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Start with Aspen Plus

A Pl U I t f Aspen Plus User Interface

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Aspen Plus Startup

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Interface of Aspen Plus

Process Flowsheet Windows Process Flowsheet Windows

Model Library Model Library (View| Model Library ) y (View| Model Library ) ( | y )

Stream

Status message 14

More Information

Help for Commands for Controlling Simulations 15

Data Browser

• The Data Browser is a sheet and form viewer with a  hierarchical tree view of the available simulation 

input, results, and objects that have been defined

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Status Indicators

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Setup Setup –– Run Type Run Type Setup  

Setup  –– Run Type Run Type

Assay Data Analysis A standalone assay data 

analysis/pseudocomponents generation run

Analyze assay data when you do not want to  perform a flowsheet simulation in the same run. 

Data Regression property constant estimation and property analysis 

calculations.

VLE, LLE and other mixture data.  Aspen Plus  cannot perform data regression in a Flowsheet  run. 

Prepare a property package for use with Aspen 

C M d l i h hi d i l

Properties Plus A Properties Plus setup run

Custom Modeler, with third party commercial  engineering programs, or with your company's 

Perform property analysis by generating tables 

of physical property values when you do not  want to perform a flowsheet simulation in the  same run

Property Estimation A standalone property constant estimation run

Estimate property parameters when you do not  want to perform a flowsheet simulation in the  same run. 

A Flowsheet run (including sensitivity studies and 

Flowsheet

optimization) also include the following  calculations: Property estimation, Assay data  analysis and Property analysis

Perform process simulations

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Input components

Remark: If available, are

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Find Components

Click “Find”

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Find Components (cont’d)

Input Component name or Formula or CAS number p p

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Property Method Selection

Property Method Selection  

Interactive help in choosing a property method

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Assistant Wizard

Specify Component type

Chemical Systems

Is the system at high pressure? (NO)

Two liquid phases

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Reference: http://www.et.byu.edu/groups/uolab/files/aspentech/

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Modify Property Model

Check “Modify Property Model” y p y

Specify New Method Name p y

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Parameters

Review Databank Data

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Review Databank Data

Including:

Ideal gas heat of formation at 298.15 K g Ideal gas Gibbs free energy of formation at 298.15 K

Heat of vaporization at TB Normal boiling point Standard liquid volume at 60°F

….

Description of each parameter

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Pure Component Databank Parameters

Help for Pure Component Databank Parameters 36

Pure Component  Temperature

Temperature‐‐Dependent Properties Dependent Properties

CPIGDP‐1 ideal gas heat capacity CPSDIP‐1 Solid heat capacity DNLDIP‐1 Liquid density

DHVLDP‐1 Heat of vaporization  PLXANT 1 Extended Antoine Equation PLXANT‐1 Extended Antoine Equation MULDIP Liquid viscosity

KLDIP Liquid thermal conductivity q y SIGDIP Liquid surface tension

UFGRP UNIFAC functional group

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So far, we have finished the basic

settings including setup, components, and properties.

This is enough to perform properties

l i

analysis.

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File Formats in Aspen Plus

Document *.apw Binary File containing simulation input and results and

intermediate convergence information Backup *.bkp ASCII Archive file containing simulation input and

results History *.his Text Detailed calculation history and diagnostic

messages Problem * appdf Binary File containing arrays and intermediate

File Type Characteristics

Introduction to Aspen Plus – Part 2

Properties Analysis in Aspen Plus

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Overview of Property Analysis

Use this form To generate

Ternary maps showing phase envelope tie lines and azeotropes of ternary

Ternary Ternary maps showing phase envelope, tie lines, and azeotropes of ternary 

systems

Azeotrope This feature locates all the azeotropes that exist among a specified set of 

components components. 

Ternary Maps

Ternary diagrams in Aspen Distillation Synthesis feature: Azeotropes,  Distillation boundary, Residue curves or distillation curves, Isovolatility curves, 

Tie lines, Vapor curve, Boiling point

Generic

Tables and plots of properties of either multi‐phase mixtures (for example,  VLE, VLLE, LLE) resulting from flash calculations, or single‐phase mixtures 

(

Generic

without flash calculations. Properties analysis of multi‐components  (more  than three) is  also included.

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Tables and plots of properties of either multi‐phase mixtures (for example,  VLE, VLLE, LLE) resulting from flash calculations, or single‐phase mixtures  without flash calculations. Properties analysis of multi‐components  (more  than three) is  also included.

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Example1: CP (Heat Capacity)

7 click Go to generate the results

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Example1: Calculation Results of CP

6 Select property method

7 click Go to generate the results

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Example: Calculation Results of H

Data results

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Tables and plots of properties of either multi‐phase mixtures (for example,  VLE, VLLE, LLE) resulting from flash calculations, or single‐phase mixtures  without flash calculations. Properties analysis of multi‐components  (more  than three) is  also included.

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Binary Component Properties Analysis

Use this Analysis type To generate

Txy Temperature‐compositions diagram at 

constant pressure Pxy Pressure‐compositions diagram at Pxy

constant temperature Gibbs energy of mixing diagram as a  function of liquid compositions. The 

Gibbs energy of mixing Aspen Physical Property System uses this 

diagram to determine whether the  binary system will form two liquid phases 

at a given temperature and pressure

at a given temperature and pressure.

Example: T

Example: T

1 Select analysis type (Txy) y yp ( y) 2 Select phase (VLE, VLLE)

3 Select compositions basis

6 Select property method

4 Specify composition range

6 Select property method

7 click Go to generate the results

Example: calculation result of T

Example: calculation result of T

Data results

Example: Generate XY plot

Click “plot wizard” to generate XY plot

Example: Generate XY plot (cont’d)

Shortcoming of Binary Analysis

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Water-BuOH

100 110

Mole Fraction (Water)

Binary Analysis cannot generate LLE data below azeotrope

Tables and plots of properties of either multi‐phase mixtures (for example,  VLE, VLLE, LLE) resulting from flash calculations, or single‐phase mixtures  without flash calculations. Properties analysis of multi‐components  (more  than three) is  also included.

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Ternary Map

1 Select three component

4 Select phase (VLE, LLE)

1 Select three component

5 Specify pressure

2 Specify number of tie line

3 Select property method

6 Specify temperature (if LLE is slected)

7 click Go to generate the results

Calculation Result of Ternary Map (LLE)

Data results

Tables and plots of properties of either multi‐phase mixtures (for example,  VLE, VLLE, LLE) resulting from flash calculations, or single‐phase mixtures  without flash calculations. Properties analysis of multi‐components  (more  than three) is  also included.

Generic analysis is used if properties analysis of mixture is performed.65

When to Use Generic Analysis

Mole Fraction (Water)

LLE? Specific composition?

Property Analysis

Property Analysis 

Select Property analysis

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Add New Analysis

Select Generic

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Specification of System

2 Select phase (VLE, LLE)

4 Specify the corresponding composition

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Determine Adjusted Variables

Specify feed condition

Temperature Pressure Vapor fraction Mole flow

Mass flow StdVol flow Mole fraction Mass fraction StdVol fraction Specify range of adjusted variables

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Specify Property‐‐Sets for  Sets for 

Calculation Results

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Add New Property

Add New Property Set (User Set (User Defined) Defined) Add New Property

Add New Property‐‐Set (User Set (User‐‐Defined) Defined)

Select Physical Property

Description

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Add New Property

Add New Property Set (cont’d) Set (cont’d)

Add New Property

Add New Property‐‐Set (cont d) Set (cont d)

If the system requires VLLE calculation

If the system requires VLLE calculation…

Select “Vapor” “1 st liquid” “2 nd liquid”

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Run Properties Analysis

Click ► to generate the results

Click ► to generate the results

Check “simulation status”

“Results Available” means convergency

“Results Available” means convergency.

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Change  Change for binary mixtures for binary mixtures

-64000 -62000 -60000 -58000

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Example 2: Calculation of  Calculation of LLE  LLE 

for  for Binary system Binary system

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Water-BuOH

100 110

Add New Property

Add New Property

Select “Vapor” “1 st liquid” “2 nd liquid”

Specify System Variable and Property

Tables and plots of properties of either multi‐phase mixtures (for example,  VLE, VLLE, LLE) resulting from flash calculations, or single‐phase mixtures  without flash calculations Properties analysis of multi‐components (more

without flash calculations. Properties analysis of multi‐components  (more  than three) is  also included.

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Conceptual Design

Azeotrope Analysis

1 Select components (at least two) 2 Specify pressure

3 Select property method

4 Select phase (VLE LLE)

6 click Report to generate the results

4 Select phase (VLE, LLE)

5 Select report Unit

Error Message

Close analysis input dialog box (pure or binary analysis)

Azeotrope Analysis Report

Ternary Maps

3 Select property method

4 Select phase (VLE, LLE)

1 Select three components

3 Select property method

2 Specify pressure 5 Select report Unit

6 Click Ternary Plot to generate the results

6 Specify temperature of LLE (If liquid-liquid envelope is selected)

Introduction to Aspen Plus – Part 3

Running Simulation in Aspen Plus

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Example 2: Flash Separation

120

T 115

T-x T-y

Saturated Feed

T=105 C P=1atm

What are flowrates and compositions of the two outlets?

xWater and yWater

What are flowrates and compositions of the two outlets?

1 0 0.8

xWater

Reveal Model Library

View|| Model Library

or press F10

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Model Library: Mixer/Splitter

Mixer Stream mixer Combines multiple streams 

into one stream

Mixing tees. Stream  mixing operations.  g p Adding heat streams.  Adding work streams FSplit Stream splitter Divides feed based on splits Stream splitters Bleed

FSplit Stream splitter Divides feed based on splits 

specified for outlet streams

Stream splitters. Bleed  valves

SSplit Substream splitter Divides feed based on splits Stream splitters Perfect

SSplit Substream splitter Divides feed based on splits 

specified for each substream

Stream splitters. Perfect  fluid‐solid separators

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Model Library: Pressure Changers

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Model Description Purpose Use for

Pump Pump or hydraulic 

turbine

Changes stream pressure when the  power requirement is needed or  known

Pumps and hydraulic  turbines

Compr Compressor or 

turbine

Changes stream pressure when  power requirement is needed or  known

Polytropic compressors,  polytropic positive 

displacement compressors,  isentropic compressors

isentropic compressors,  isentropic turbines

Mcompr Multistage 

compressor or

Changes stream pressure across  multiple stages with intercoolers

Multistage polytropic compressors polytropic

compressor or  turbine

multiple stages with intercoolers. 

Allows for liquid knockout streams  from intercoolers

compressors, polytropic positive displacement  compressors, isentropic  compressors isentropic

compressors, isentropic  turbines

Valve Valve pressure 

drop

Models pressure drop through a  valve

Control valves and pressure  changers

Pipe Single segment 

pipe

Models pressure drop through a  single segment of pipe

Pipe with constant diameter  (may include fittings)

Pipeline Multiple segment Models pressure drop through a Pipeline with multiple

Pipeline Multiple segment 

pipeline

Models pressure drop through a  pipe or annular space

Pipeline with multiple  lengths of different  diameter or elevation 103

Adding Material Streams

Click “Materials” and then click again on the flowsheet window

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Adding Material Streams (cont’d)

When clicking the mouse on the flowsheet window

When clicking the mouse on the flowsheet window, arrows (blue and red) appear.

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Adding Material Streams (cont’d)

When moving the mouse on the arrows, some description appears.

Blue arrow: Water

decant for Free water

of dirty water

Red arrow(Left) Feed

(Required; one ore more

if mixing material

Red arrow(Right):

Product (Required; if

mixing material streams)

of dirty water. if mixing material

streams)

mixing material streams)

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Adding Material Streams (cont’d)

After selecting “Material Streams”, click and pull a stream line Repeat it three times to generate three stream lines

Repeat it three times to generate three stream lines.

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(Feed Stream)

Right Click on the stream and

select Reconnect Destination

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(Product Stream)

Right Click on the stream and

select Reconnect Source

Specifying Feed Condition

Right Click on the stream

and select Input

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Specifying Feed Condition

You must specify two of the following

If you specify component fractions, you must specify the total mole,

If you specify component fractions, you must specify the total mole, mass, or standard liquid volume flow.

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Specifying Feed Condition (cont’d) Specifying Feed Condition (cont d)

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Specifying Input of Mixer

Right Click on the block and select Input

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Specifying Input of Mixer (cont’d)

Specify Pressure and valid phase

The corresponding description about this blank:

Outlet pressure if value > 0 Pressure drop if value ≦ 0

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Run Simulation

Click ► to run the simulation

Run Start or continue calculations Step Step through the flowsheet one block at a time Stop Pause simulation calculations

Reinitialize Purge simulation results

Check “simulation status”

“Required Input Complete” means the input is ready to run simualtion q p p p y

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Status of Simulation Results

Status of Simulation Results 

Results available The run has completed normally, and results are 

present present.

Results with warnings 

Results for the run are present. Warning  messages were generated during the 

l l i Vi h C l P l Hi

esu ts t a gs

calculations. View the Control Panel or History  for messages. 

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Control Pannel

Click here

1.A message window showing the progress

of the simulation by displaying the most

recent messages from the calculations

2.A status area showing the hierarchy and

order of simulation blocks and convergence

order of simulation blocks and convergence

loops executed

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