DIP_simu_01.ppt p. 1
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DIP_simu_01.ppt
Introduction
• Tutor mode• Chemical process simulator structure
DIP_simu_01.ppt p. 2
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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
DIP_simu_01.ppt p. 3
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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
DIP_simu_01.ppt p. 4
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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
DIP_simu_01.ppt p. 5
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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]
DIP_simu_01.ppt p. 6
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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
DIP_simu_01.ppt p. 7
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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
DIP_simu_01.ppt p. 8
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Results ...
DIP04_00.apw
DIP_simu_01.ppt p. 9
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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)
DIP_simu_01.ppt p. 10
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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.
DIP_simu_01.ppt p. 11
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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
DIP_simu_01.ppt p. 12
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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, ...
DIP_simu_01.ppt p. 13
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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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DIP_simu_01.ppt p. 15
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DIP_simu_01.ppt p. 16
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THERMODYNAMIC AND TRANSPORT PROPERTIES CALCULATION MODELS
DIP_simu_01.ppt p. 17
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UNIT OPERATION MODELS
DIP_simu_01.ppt p. 18
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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
DIP_simu_01.ppt p. 19
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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).
DIP_simu_01.ppt p. 20
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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
DIP_simu_01.ppt p. 21
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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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DIP_simu_01.ppt p. 23
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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.
DIP_simu_01.ppt p. 24
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100 kmol/h benzene toluene (50%w) 20ºC 1 atm
3 atm 135ºC1 atm
DIP_simu_01.ppt p. 25
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DIP_simu_01.ppt p. 26
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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
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