CALCULATOR - aspentk.blog.ugm.ac.idaspentk.blog.ugm.ac.id/files/2012/11/TUTOR-7-CALCULATOR.pdfContoh...
Transcript of CALCULATOR - aspentk.blog.ugm.ac.idaspentk.blog.ugm.ac.id/files/2012/11/TUTOR-7-CALCULATOR.pdfContoh...
Fungsi CALCULATOR
• Menghitung suatu nilai variable tertentu yang ingin diketahui
• Menghitung suatu nilai variable tertentu yang selanjutnya digunakan dalamproses simulasi
Cara
• Buat blok calculator
• Identifikasi variabel-variabel yang akan digunakan dalam menghitung
• Susun formula di fortran atau excel
• Tentukan kapan blok kalkulator dilaksanakan
Contoh Soal
Pembuatan Propilen Glikol di dalam RCSTR
• C3H6O + H2O C3H8O2
Propylene oxide Water Propylene glycol
• Property methods : Wilson
• Kondisi Umpan:
• T = 25O C
• P = 3,5 bar
• C3H6O = 18,762 kmol/hr
• H2O = 250 kmol/hr
• Methanol = 32,73 kmol/hr (ditambahkan agar C3H6O larut dalam air)
• Kondisi Operasi Adiabatik dengan P = 3,5 bar
• T = 25o C
• Volum RCSTR = 1,1357 m3
• Valid phases = Vapor-Liquid
• Reaction Phase = Liquid
• (-ra) = k Cp2
• k = 9,15E+22exp(-155600000/RT)
• E[=] J/kmol
Kemudian : RUN!!!!
Contoh Soal
ResultPRODUK REAKTAN
Temperature C 25 25
Pressure bar 3,5 3,5
Vapor Frac 0 0
Mole Flow kmol/hr 300,257 301,492
Mass Flow kg/hr 6642,258 6642,258
Volume Flow cum/hr 7,149 7,16
Enthalpy Gcal/hr -19,488 -19,485
Mole Flow kmol/hr
PO 17,527 18,762
WATER 248,765 250
PG 1,235 0
M 32,73 32,73
Case 1
Ingin diketahui konversi yang dicapai
• Flowsheeting Option >> Calculator >> New >> C-01
• Define :
IN = mol flow, REAKTAN, PO, import variable
OUT = mol flow, PRODUK, PO,import variable
Case 1
• Import Variables: menentukan arus informasi dari blok atau stream yang sudah tersedia datanya untuk diinput ke calculator blok.
• Export Variables: menentukan arus informasi dari calculator block ke AspenPlus.
Calculator > SequenceIf you choose this option The block is executed
First At the beginning of a simulation
Last At the end of a simulation
Before Immediately before the specified block
After Immediately after the specified block
Report While the report is being generated
Based on order in sequenceAs specified on the Convergence Sequence from
specifications sheet
Use Import/Export variables
Automatically based on Import variables and Export
variables; allows Aspen Plus to place the Calculator
block in the execution sequence
Fortran Write Statement
Unit DestinationNTERM Control Panel (if running from the
user interface)NHSTRY Simulation history
Excel
• Open excel spreadsheet
> Add-Ins
> Define masing-masing variabel
> Buat format hitungan konversi
> RUN!!!• Hasilnya langsung dilihat di form excel
Case 2
• Bila ratio umpan air : propylene oxide = 8
• Berapa konversi yang dicapai??
• Flowsheeting Option >> Calculator >> New >> C-02
PO = mol flow, feed, PO, import variable
W = mol flow, feed, WATER, export variable