aspen custom modeler overview

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Heat and Power Technology, Stockholm, Sweden

ASPEN ENGINEERING SUITE OVERVIEW

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Software for integrated process engineering, including steady-state and dynamic process simulation, equipment design, and cost evaluation.

General Overview

Source: Aspen Technology, 2012

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ASPEN PLUS

OVERVIEW

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Aspen Plus • Aspen Plus is a process modeling tool for conceptual design,

optimization, and performance monitoring for diverse industries. Aspen Plus is a core element of AspenTech’s Process Engineering applications.

• Given thermodynamic data, realistic operating conditions, and rigorous equipment models Its possible to simulate actual plant behaviors, by using basic engineering relations such as mass and energy balances, and phase and chemical equilibrium

• Features Best-in-class physical properties methods and data Diverse Model library : Simulation of a wide range of processes Scalability for large and complex processes Online deployment of models: real-time optimization/advanced

process control applications Workflow automation: Aspen Plus models can be linked to Microsoft

Excel® using Aspen Simulation Workbook or Visual Basic®

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Aspen Plus


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Simulation Steps

1. Define Process Flow Sheet. Units –Streams-Models

2. Specify Chemical Components

3. Specify Thermodynamic Model Estimation of physical properties

4. Specify Flow Rates and Thermodynamic conditions

5. Run Simulation – Analyze Results

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Example

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Define Process Flow Sheet Coal Drying Flowsheet

WET-COAL

NITROGEN

DRY-REAC

IN-DRIER

DRY-FLSH

EXHAUST

DRY-COAL


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Specify Chemical Components


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Specify Thermodynamic Model


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Specify Flow Rates conditions


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Simulation Results


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ASPEN CUSTOM MODELER

OVERVIEW

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General Overview • Aspen Custom Modeler is a process and equipment

model development and simulation environment

• Aspen Custom Modeler (ACM) is used to create rigorous models of processing equipment and to apply these equipment models to simulate and optimize continuous, batch, and semi-batch processes.

• It is used across many industries including chemicals, power, nuclear, food and beverage, metals and minerals, pharmaceuticals, and othrers

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Features Designed for process engineers : ACM uses a flow

sheeting environment based on streams and equipment and includes built-in understanding of components and process thermodynamics.


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Features Physical properties methods and data: ACM is fully

integrated with Aspen Properties, it includes extensive databases of pure component and phase equilibrium data for chemicals, electrolytes, solids, and polymers


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Features Equation oriented architecture : ACM language is declarative, you say “what” you want and leave it to ACM to find out “how”.

- Solver for system of Algebraic Equations, based on Newton iterative procedure


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Features - System of differential and algebraic equations

Integration Algorithms - Implicit: Implicit Euler (fixed or variable step), gear - Explicit: Explicit Euler, Runge Kutta


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Features Flexible user-defined forms

Volume

Time Hours

Vol

ume

9,0 9,5 10,0 10,5 11,0 11,5 12,0 12,5 13,0 13,5 14,0

0,0

50,0

100,

0

Table Forms Time series Plot forms

Phase Plots

Pressure vs Volume

Volume (m3)

Pre

ssur

e (P

a)

2,e-004 4,e-004 6,e-004 8,e-004 0,001

1,5e

+007

2,e+

007

2,5e

+007

Mass distribution

Crank angle (Rad)

Reg

ener

ator

spa

ce (k

g)E

xpan

sion

spa

ce (k

g)C

ompr

essi

on S

pace

(kg)

0,0 1,57 3,14 4,71 6,28

0,00

250,

0075

0,01

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Profile Plots

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Features • Optimization and estimation tools enabling

parameter fitting, data reconciliation, and steady-state and dynamic process optimization.

Estimation example


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Features Optimization example

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Features

• Flexible Task Language to define batch recipes, transition schemes, or to simulate process equipment failures or other disturbances

Heating System example:


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Features • Export Equipments or process models


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Features

•Library of control models : to simulate process control systems.

•Online deployment of models : ACM includes an OLE for Process Control (OPC) interface, enabling links to process control and information management systems

•Workflow automation: ACM models can be linked to Microsoft Excel® using Aspen Simulation Workbook or Visual Basic®, enabling workflow automation and allowing model deployment to casual users

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Model Example

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Department of Energy Technology

Stirling Engine Adiabatic Model + Losses

Assumptions

-Adiabatic expansion and compression spaces

- Sinusoidal volume variations

-Ideal gas inside the engine

- Heat Losses

-Friction and Pressure drop losses

-Non ideal Regenerator

- Heat transfer model from the external source to the engine included.

Source: Urielli 2014, http://www.ohio.edu/mechanical/stirling/me422.html

Source: Genoa Stirling, http://www.genoastirling.com/

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Heater

Regenerator

Cooler

StirlingS7

S8

S9

Ideal Adiabatic Losses Solution Aspen- C++

Pressure Losses

Internal Conducction Heat Exchangers

Regenerator Losses

Shuttle Effect Losses

)(1 dQridQ ε−=

JLdTcTdkpDdzdQ )(4.0 2 −

=

ρµ

ρ

2

.2Ad

VmfrP

PmdQ

−=∆

∆=

TLkAdQ ∆=

+

Ths(source)Tks(source)

Tho(heater)Tko(cooler)

Teo=ThoTco= Tko

Solve DifferentialEquations

Calculate Tc, Te

After 360(cycle)

If Tc<>TcoTe<>Teo

Tco=TcTeo=Te

QheaterQ cooler

Qloss

Th=Ths-Qhs/UATk=Tks-Qks/UA

If Th<>ThoTk<>Tko

Tho=ThTko=Tk

QheaterQ cooler

Qloss

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Preliminary Results – Adiabatic model Mass distribution

Crank angle (Rad)

Reg

ener

ator

spa

ce (k

g)E

xpan

sion

spa

ce (k

g)C

ompr

essi

on S

pace

(kg)

0,0 1,57 3,14 4,71 6,28

0,00

250,

0075

0,01

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Pressure vs Volume

Volume (m3)

Pre

ssur

e (P

a)

2,e-004 4,e-004 6,e-004 8,e-004 0,001

1,5e

+007

2,e+

007

2,5e

+007

Heat

Crank angle (Rad)

Q c

oole

r (Jo

ules

)Q

hea

ter (

Joul

es)

0,0 1,57 3,14 4,71 6,28-400

0,0

0,0

4000

,0800

0,0

Work

crank angle

Isot

herm

al W

ork

(Jou

les)

Expa

nsio

n w

ork

(Jou

les)

Com

pres

sion

Wor

k(Jo

ules

)To

tal W

ork

(Jou

les)

0,0 1,57 3,14 4,71 6,28

0,0

2000

0,0

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THANKS

aspen custom modeler overview

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