DIP_simu_01.ppt Introduction Tutor mode Chemical process simulator structure

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 20ºC 1 bar 5 bar COMPRESSOR

How do you calculate the condition of the compressed stream? AIR 20ºC 1 bar 5 bar COMPRESSOR 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

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

Example simulation (Tutor Mode) [F4] 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) RUN 8) 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.

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 bar DISPLAY MODE (/Window) Normal Workbook Flowsheet as Wallpaper 1) Draw the PFD of the example. 2) NEXT → PFD complete. Continue? → OK

Forms TITLEBAR BROWSER 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

Results ... DIP04_00.apw

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)

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.

REACTION (equilibrium, kinetics,...) SIMULATION SOFTWARE STRUCTURE PROBLEM DEFINITION PFD Flows Conditions (P, T, V,...) Specifications (reflux ratio,...) PHASE EQUILIBRIUM REACTION (equilibrium, kinetics,...) PROPIEDADES FISICAS MAS & ENERGY BALANCES BLOCK OPERATION PHYSICAL PROPERTIES EQUIPMENT DESIGN COST EVALUATION RESULTS

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, ...

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),...

THERMODYNAMIC AND TRANSPORT PROPERTIES CALCULATION MODELS

UNIT OPERATION MODELS

Help Menus: Context-sensitive status line. Forms: 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

COST (€/h) = A WkW + B Nºunits €/kW-h (Capital + Operating costs) Another example (DIP04_01) 800 kg/h Acetone (20%mol) + N2 20ºC, 1 bar 200ºC, 16 bar Utilities: Cooling water at 30ºC and saturated steam at 220ºC (ΔTmin= 10ºC) Unit operations: heaters and isentropic compressors (GPSA). 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

First case (DIP04_01A): 1) Compress to 16 bar 2) Heat up to 200ºC

Condensation in stream 3 !! Second case (DIP04_01B): 1) Compress to 4 bar 2) Cool down to 40ºC 3) Compress to 16 bar 4) Heat up to 200ºC Condensation in stream 3 !!

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.

100 kmol/h benzene toluene (50%w) 20ºC 1 atm 1 atm 3 atm 135ºC

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’ Examples Applications