Adhemar ASPEN

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Heat and Power Technology, Stockholm, Sweden

ASPEN ENGINEERING SUITEOVERVIEW


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Software for integrated process engineering, including steady-stateand dynamic process simulation, equipment design, and costevaluation.

General Overview

Source: Aspen Technology, 2012


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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 AspenTechs Process Engineeringapplications.

Given thermodynamic data, realistic operating conditions, andrigorous equipment models Its possible to simulate actual plantbehaviors, by using basic engineering relations such as mass

and energy balances, and phase and chemical equilibrium Features Best-in-class physical properties methods and dataDiverse Model library : Simulation of a wide range of processesScalability for large and complex processesOnline deployment of models: real-time optimization/advancedprocess control applicationsWorkflow automation: Aspen Plus models can be linked to MicrosoftExcel using Aspen Simulation Workbook or Visual Basic


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Aspen Plus


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Example


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Define Process Flow SheetCoal 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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FeaturesDesigned for process engineers : ACM uses a flow

sheeting environment based on streams and equipment

and includes built-in understanding of components andprocess thermodynamics.


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FeaturesEquation oriented architecture : ACM language isdeclarative , 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 Optimization and estimation tools enabling

parameter fitting, data reconciliation, and steady-state

and dynamic process optimization.

Estimation example


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FeaturesOptimization example


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Features

Flexible Task Language to define batch recipes,

transition schemes, or to simulate process equipmentfailures or other disturbances

Heating System example:


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Features Export Equipments or process models


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Model Example


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Department of Energy Technology

Stirling Engine Adiabatic Model + Losses

Assumptions

-Adiabatic expansion and compressionspaces

- Sinusoidal volume variations

-Ideal gas inside the engine

- Heat Losses

-Friction and Pressure drop losses

- Non ideal Regenerator

- Heat transfer model from the externalsource to the engine included.


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Heater

Regenerator

Cooler

StirlingS7

S8

S9

Ideal Adiabatic LossesSolution Aspen- C++

Pressure Losses

Internal Conducction HeatExchangers

Regenerator Losses

Shuttle Effect Losses

)(1 dQridQ

JLd TcTd kpDd z

dQ )(4.0 2

2

.

2

Ad V m fr

P

PmdQ

T LkA

dQ

+

Ths(source)Tks(source)

Tho(heater)Tko(cooler)

Teo=ThoTco= Tko

Solve DifferentialEquations

Calculate Tc, Te

After 360(cycle)

If TcTcoTeTeo

Tco=TcTeo=Te

Qheater Q cooler

Qloss

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

If ThThoTkTko

Tho=ThTko=Tk

Qheater Q cooler

Qloss


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THANKS

Documents

Adhemar ASPEN