Ch E 310 - Fall 10 - Lecture 10

Ch E 310 - Fall 10 - Lecture 10 - Lecture 10 September 28,...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 10 – September 28, 2010 Agenda: Introduction to Sequential Modular Simulations Work with mixer.m during remaining time (Discussion of Exam 1 will have to wait until I receive distance students’ exams)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Process Modeling of Large Systems Two approaches to solving large systems: Equation-based approach (e.g., A x = b) o Set up a system of equations/unknowns o Solve everything simultaneously Sequential Modular approach Equations for each unit are defined Calculations move unit-to-unit in sequence Recycle streams require trial-and-error
Background image of page 2
Sequential Modular Simulation Sequential Modular approach: Reconstruct the flowchart in terms of blocks or modules (and streams connecting them) modules calculate and define characteristics ( T, P, x i , y i , etc.) of the output stream(s) Examples of modules: o mixer – adiabatic mixing of inlets o splitter – multiple outlets, constant T and P o column – vapor-liquid equilibrium expressions o reactor – account for reactions (moles, energy) o pump – raise the pressure of a fluid stream
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Sequential Modular Simulation Each process unit has its own module that performs the necessary calculations Inlet streams have input parameters and unknowns Outlet streams leave as defined quantities The modules should be flexible to account for a variable number of inlets and outlets Let’s consider a simple mixer unit example to see how this would work (see Felder & Rousseau pages 511-514) mixer stream 1 stream 2 stream 3
Background image of page 4
Sequential Modular Simulation mixer stream 1 stream 2 stream 3 n 1A (mol A/s) n 1B (mol B/s) n 1C (mol C/s) T 1 n 2A (mol A/s) n 2B (mol B/s) n 2C (mol C/s) T 2 n 3A (mol A/s) n 3B (mol B/s) n 3C (mol C/s) T 3 P mixer = 1 atm T mixer = T 3 Degree of freedom: 12 variables (9 flows, three temperatures) Need to specify all inlet conditions 4 unknowns (outlet stream) Mass balances on A, B, C: n 1A + n 2A = n 3A n 1B + n 2B = n 3B n 1C + n 2C = n 3C all molar outlet flows are defined; only need T 3 Example: 2 inlets, 3 components (A, B, C)
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Sequential Modular Simulation mixer stream 1 stream 2 stream 3 n 1A (mol A/s) n 1B (mol B/s) n 1C (mol C/s) T 1 n 2A (mol A/s) n 2B (mol B/s)
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/21/2011 for the course CH E 310 taught by Professor Staff during the Spring '08 term at Iowa State.

Page1 / 17

Ch E 310 - Fall 10 - Lecture 10 - Lecture 10 September 28,...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online