DIP_simu_01.ppt p. 1 Integrated Process Design (Simulation) DIP_simu_01.ppt Introduction Tutor mode Chemical process simulator structure

DIP_simu_01.ppt p. 1

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DIP_simu_01.ppt

Introduction

• Tutor mode• Chemical process simulator structure


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EXAMPLE:

A stream with a molar flow of 200 kmol/h of air at 20ºC and 1 bar is compressed to 5 bar in a single-stage positive displacement compressor.

AIR

20ºC1 bar

5 barCOMPRESSOR


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How do you calculate the condition of the compressed stream?

• Inlet stream enthalpy.

• Enthalpy increase in the compressor:

• Polytropic efficiency.

• Inlet and outlet pressure condition.

Outlet stream enthalpy

Outlet stream condition

AIR

20ºC1 bar

5 barCOMPRESSOR


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How do I simulate this process? (Tutor mode)

• Process flow diagram.

• Components (AIR).

• Thermodynamic model (Peng-Robinson EOS)

• Inlet stream definition : 20ºC, 1 bar, 200 kmol/h.

• Compressor characterization : positive displacement, Pout= 5 bar


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1) Process flow diagram (PFD):

2) Setup• Global/Title: Air compression• Description: A stream with a molar flow of 200 kmol/h of air at 20 º C and 1 bar is compressed to 5 bar in a

single-stage positive displacement compressor.3) Components

• ID: AIR• Name: AIR

4) Properties• Check all available Base-method: Process Type = ALL.• Process Type: GASPROC• Base-Method: PENG-ROB

5) Stream S1• 20ºC, 1 bar, 200 kmol/h of AIR

6) Block B1• Positive displacement, Discharge pressure: 5 bar

7) RUN8) Results

• See PFD• Stream S1 results (Select / Right-click / Results)• Stream S2 results (select in the browser)• Select stream S1 in a new column to compare results.• Block B1 results.

Example simulation (Tutor Mode) [F4]


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Main window

ELEMENTS• Titlebar• Menu bar• Toolbars:

• Right-click• Process Flowsheet window• Model library [F10]:

• Select Mode button• Streams• Blocks

•Many: click•One: drag&drop

• Status barDISPLAY MODE (/Window)

• Normal• Workbook • Flowsheet as Wallpaper

1) Draw the PFD of the example.2) NEXT → PFD complete. Continue? → OK


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Forms

TITLEBARBROWSER

• Status symbol.TOOLBAR

• Upper level• Show/Hide data browser• Units• Back/Forward (history)• Previous (<<) Next (>>) Form• All/Input/Results• Comments• Status • Next

SHEETS• Input and Result values.• Text and number fields, drop down menus, radio buttons, ...• Context-sensitive help status line.• Other sheets: Object Manager


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Results ...

DIP04_00.apw


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Stream S1 results (Select / Right-click / Results)Stream S2 results (select in the browser)Select stream S1 in a new column to compare results.Block B1 results (Select / Right-click / Results)


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CHEMICAL PLANT SIMULATION SOFTWARE: GENERAL STRUCTURE

Commercial software:

FLOWTRAN, PROCESS, DESIGN 2000, ASPEN, ChemCAD, HYSIM, SPEEDUP,...

Simulation software objective:

Determine the topology, flow and operating conditions that lead to an optimal design of the process.

Maximize profit. Minimize energy consumption and raw materials. Minimize waste.


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SIMULATION SOFTWARE STRUCTURE

PROBLEM DEFINITION

PFD

Flows

Conditions (P, T, V,...)

Specifications (reflux ratio,...)

MAS & ENERGY

BALANCES

BLOCK

OPERATION

PHASE

EQUILIBRIUM

REACTION (equilibrium, kinetics,...)

PROPIEDADES FISICAS

EQUIPMENT DESIGN

COST EVALUATION

RESULTS

PHYSICAL PROPERTIES


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SIMULATION SOFTWARE ROUTINES:

General management routine.

Physical properties database.

Thermodynamic and transport properties calculation package.

Operating blocks routines.

User Interface.

Other: optimization, sensitivity analysis, dynamic simulation, properties correlation, ...


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PHYSICAL PROPERTIES DATABANK

The PURE20 databank contains parameters for 1,898 (mostly organic) components. The databank is based on the data developed by the AIChE DIPPR® data compilation project.

The parameters stored in the databank can be categorized as:.

· Universal constants, such as critical temperature, and critical pressure

· Temperature and property of transition, such as boiling point and triple point

· Reference state properties, such as enthalpy and Gibbs free energy of formation

· Coefficients for temperature-dependent thermodynamic properties, such as liquid vapor pressure

· Coefficients for temperature-dependent transport properties, such as liquid viscosity

· Safety properties, such as flash point and flammability limits

· Functional group information for all UNIFAC models

· Parameters for RKS and PR equations of state

· Petroleum-related properties, such as API gravity, octane numbers, aromatic content, ...

· Other model-specific parameters, such as the Rackett and UNIQUAC parameters

Other databanks: INORGANIC (2,477 components), AQUEOUS (1,676 ionic species), COMBUST (59 components typically found in combustion products, including free radicals),...


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THERMODYNAMIC AND TRANSPORT PROPERTIES CALCULATION MODELS


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UNIT OPERATION MODELS


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Help

• Menus: Context-sensitive status line.• Forms:

• Context-sensitive status line. • F1 (/B1/Results: Volumetric Efficiency, Select, F1)

• Expert system (NEXT):• Completing input specifications (Tutor mode)• Tells you when your specifications are inconsistent

or incomplete.• If the field where you want to enter data is inactive,

the Prompt for the field tells you why. • Tells you which are the missing values in incomplete

forms.

Windows conventional help:

• Menu: /Help/Help Topics

• Menu: /Help/What’s this

• Manuals:

Inicio /Todos los Programas /AspenTech /aspenONE V7.1 Documentation /Aspen Engineering V7_1 /Aspen Plus

• AspenPlusProcModelV7_1-Start.pdf• AspenPhysPropMethodsV7_1-Ref.pdf• AspenPhysPropModelsV7_1-Ref.pdf


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Another example (DIP04_01)

800 kg/h

Acetone (20%mol) + N2

20ºC, 1 bar

200ºC, 16 bar

COST (€/h) = A WkW + B Nºunits

€/kW-h(Capital + Operating costs)

Compressor Heating Cooling

A 0.18 0.052 0.011

B 0.03 0.010 0.010

Utilities: Cooling water at 30ºC and saturated steam at 220ºC (ΔTmin= 10ºC)

Unit operations: heaters and isentropic compressors (GPSA).


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First case (DIP04_01A):1) Compress to 16 bar2) Heat up to 200ºC

No.Wcomp

(kW) No.Wcalef

(kW) No.Wrefr

(kW)

S

(kW)€/h

1 83.85 0 1 -36.47 47.38 15.53


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) Condensation in stream 3 !!

Second case (DIP04_01B):1) Compress to 4 bar2) Cool down to 40ºC3) Compress to 16 bar4) Heat up to 200ºC


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Another example (DIP04_02)

Flash operation

A stream of 100 kmol/h of benzene and toluene, 50% by weight, at 20ºC and 1 atm, is compressed with a pump up to 3 atm and then heated in a heat exchanger up to 135ºC. The mixture is finally expanded to 1 atm into a flash vessel, where one vapor and one liquid streams are obtained.


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100 kmol/h benzene toluene (50%w) 20ºC 1 atm

3 atm 135ºC1 atm


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Applications and Examples

Applications: Files showing several several options. Real examples with comments.

Examples: example files used in the getting started manuals.

Open / More Files / ‘Favorites’

ExamplesApplications

Documents

DIP_simu_01.ppt p. 1 Integrated Process Design (Simulation) DIP_simu_01.ppt Introduction Tutor mode Chemical process simulator structure