Sukhoon Choi

EPEL lab

Aspen PlusIntroduction to Flowsheet Simulation

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• What is flowsheet simulation?- Use of computer program to quantitatively model the characteristic equations of a chemical process

• Uses physical relationships- Mass & energy balance- Equilibrium relationships- Rate correlations (reaction and mass/heat transfer)

• Predicts- Process stream data (flowrate, composition, properties…)- Operating conditions (pressure, temperature, geometry…)

• Advantages- Plant design time- Improve current process / predict new process- Assist plant operation

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Environment

Workspace

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• 1. Property environment- component, properties, EOS selection

• 2. Simulation environment- streams, blocks (unit operations) setting

• 3. Simulation- control panel : converge the simulation by calculating in sequence

• 4. Analysis- sensitivity, cost estimation, energy, EDR, design specification results…

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• All steps needed to fully define the physical properties before the simulation- component selection and characterization- property methods and databases- property estimation / structure drawing- property analysis / data regression

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• Component selection

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• Physical methods

Method advice

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• Stream

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• Tips for mouse buttons

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• Unit operation (block) model types- mixers/splitters- separators- exchangers- columns- reactors- pressure changers- manipulators- solids- solid separators- user models- batch models

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• Mixers/Splitters

Model Mixer Fsplit Ssplit

Description Mixer Splitter Sub-stream splitter

PurposeCombines multiple streams

together. Adiabatic, can change perssure

Separates one (or more) streams into a number of

outlets. Give flow or fraction for each outlet.

Solids from liquid. Separates one (or more) streams into a number of outlets. Give flow

or fraction for each sub-stream.

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Model Flash2 Flash3 Decanter Sep

Description Two-outlet flash Three-outlet flash Liquid-liquid decanter

Component separator

Purpose

Separate feed into two outlet streams,

using rigorous vapor-liquid or

vapor-liquid-liquid equilibrium

Separate feed into three outlet streams,

using rigorous vapor-liquid or

vapor-liquid-liquid equilibrium

Separate feed into two liquid outlet

streams

Separates inlet stream components into multiple outlet streams, based on

specified flow or split fractions

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• Separators

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Model Heater HeatX MHeatX

Description Heater, Cooler Two-stream heat exchanger Multi-stream heat exchanger

Purpose Determines thermal and phase conditions

Exchange heat between two streams

Exchange heat between any number of streams

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• Heat exchanger

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Model DSTWU Distl RadFrac MultiFrac

Description

Shortcut distillation design using the

Winn-Underwood-Gilliland method

Shortcut distillation rating using the

Edmister method

Rigorous fractionation

Rigorous fractionation for

complex columns

Purpose

Determines minimum reflux ratio, minimum number of

stages and either actual reflux ratio or

actual number of stages

Determines separation based on reflux ratio, number

of stages, and distillate-to-feed ratio

Performs rigorous rating and design calculations for single columns

Performs rigorous rating and design calculations for

multiple columns of any complexity

• Distillation

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Model RStoic RYield REquil RGibbs

Description Stoichiometric reactor Yield reactor Equilibrium reactor Equilibrium reactor

PurposeStoichiometric reactor with

specified reaction extent or conversion

Reactor with specified yield

Chemical and phase equilibrium by stoichiometric calculations

Chemical and phase equilibrium by Gibbs energy minimization

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• Reactors

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Model Pump Compr MCompr

Description Pump, Hydraulic turbine Compressor, Turbine Multi-stage compressor, Turbine

Purpose

Change stream pressure when the pressure, power

requirement or performance curve is known

Change stream pressure when the pressure, power

requirement or performance curve is known

Change stream pressure across multiple stages with

inter-coolers. Allows for liquid knock-out streams

from inter-coolers

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• Pressure changers

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• For all reactors : temperature 70, pressure 1 atm

• Make sure to set valid phases option to vapor-liquid

• Rstoic reactor : Ethanol + acid -> water + Ethyl Acetate

• RGIBBS reactor : no reactions needed, 2 fluid phases

• Reaction model for Rplug, RCSTR:- reversible reaction- kinetics for forward reaction : k, E- driving force with equilibrium constant

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• 1. Rstoic reactor

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• 1. Rstoic reactor

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• 2. RGibbs reactor

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• 3. Rplug reactor – reaction

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• 3. Rplug reactor – reaction

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• 3. Rplug reactor

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• 4. RCSTR reactor

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