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Process modeling & simulation

CH-401

Course outline

Roger G. E. Franks, “Modeling and Simulation in Chemical Engineering”

W. L. Luyben, “Process Modeling, Simulation, and Control for Chemical Engineers” R. W. Gaikwad, “Process Modelling And Simulation” Amiya K. Jana, “Chemical Process Modelling and Computer Simulation

• P process is a routine activity • M representation of a process as a

real system • S interaction between process and

model

Models A model is the simplification of reality used to predict system behavior. • Physical Model • Mathematical Model Mathematical models can be useful in all phases of chemical engineering, from research and development to plant operations, and even in business and economic studies. • Research and development • Design • Plant operation:

**Principles of Formulation
**• Basis
• Assumptions
• Mathematical Consistency Of Model
• Solution Of The Model Equations
• Verification

Modeling and Simulation procedure

• Translating the description of a physical system into an appropriate mathematical form.

• Selecting a suitable computational technique.

• Implementing the computational technique in the form of a computer program.

Simulation What is process simulation for? 1. To interpret process flowsheets, 2. To locate malfunctions, and 3. To predict the performance of process.

Simulation methodology 1. Problem definition 2. Design the study 3. Design the conceptual model 4. Formulate inputs, assumptions and process

definitions 5. Build, verify & validate the simulation model 6. Conduct design of experiments 7. Documentation 8. Define the model life cycle

Limitations of simulation o Lack of good data and knowledge of process mechanism. o Character of the computational tools o the danger of forgetting the assumptions mode in modeling the process

Fundamental of chemical engineering

Fundamental of chemical engineering

• System and its types • Open • closed • isolated

Classification of models

• Linear vs nonlinear • Steady state vs unsteady state • Lumped parameter vs distributed

parameter • Continuous vs discrete variables

Fundamental laws Continuity Equations

COMPONENT CONTINUITY EQUATIONS (COMPONENT BALANCES).

• Energy Equation

• Equations of State

Unit operations • Absorption and stripping • Distillation and its types • Reactor and its types • Phase separation • Heat exchanger,condensor,evaporator • Adsorption • Extraction • Humidification

FLOWSHEETING

BFD PFD

AND P&ID

Representation of process
• **Process flow diagrams (PFDs) are used in chemical and process
**

engineering. These diagrams show the flow of chemicals and the equipment involved in the process. Generally, a Process Flow Diagram shows only the major equipment and doesn't show details. PFDs are used for visitor information and new employee training.

• **A Process and Instrument Drawing (P&ID) **includes more details than
a PFD. It includes major and minor flows, control loops and
instrumentation. P&ID is sometimes referred to as a Piping and
Instrumentation Drawing. These diagrams are also called flow sheets.
P&IDs are used by process technicians and instrument and electrical,
mechanical, safety, and engineering personnel.

• In both diagrams arrows show the flow of material and symbols show tanks, valves, and other equipment.

• The symbols used vary somewhat from organization to organization. So you may see several different symbols that all represent a motor.

Equipment symbols