INTRODUCTION TO HYSYS ppt

INTRODUCTION TO HYSYS HYSYS is a flow-sheeting package for the design and simulation of processes.. • Select the components for the simulation, e.g.. • Select a distillation column: clic

INTRODUCTION TO HYSYS

HYSYS is a flow-sheeting package for the design and simulation of processes Full

documentation can be found in the extensive on-line manuals, available via the Start Menu in Windows In this introduction to

the package you will consider

some simple systems such as

distillation columns, reactors and

heat exchangers There will be

three sessions in which you will

cover some of the basics You will

then be able to use the package

throughout the remainder of your

course and beyond You will also

get to use the package in Design

Week so this should be considered

as grounding in the basics

EXERCISE 1

Open HYSYS.Plant using the path:

Start|Programs|Applications|Engineering|AEA Technology|HYSYS.Plant|HYSYS.Plant

• Open a New Case (File|New Case)

• Add a fluids package The one you choose will depend on the simulation you want to

perform Here we will use Peng Robinson

• Select the components for the simulation, e.g a hydrocarbon separation Type in

Match to find components (SimName used by HYSYS)

o Select propane, n-butane, i-butane, n-pentane, i-pentane, and n-hexane

o Input the Parameters (interaction parameters) if required

o Input the Binary coefficients if required (0 = unknown) Use the defaults for now

• Return to the simulation Basis Manager

• You now need to add Reactions if required We will set up an equilibrium reaction

• First you need to define an Associated Fluids Package Click Add to FP, then select Basis-1 and Add Set to Fluid Package

• Next select Add Comps and then Add This Group of Components

• Click Add Rnx Chose Equilibrium then Add Reaction

• Click on the *add comp* cell and chose a component from the dropdown selector !

o For this example choose n-butane and i-butane with stoichiometry coefficients

of +1 and –1

• If the set up is correct, a green ‘Ready’ box replaces the red ‘Not Ready’

• Close down the open windows to get back to the Simulation Basis Manager

Now the Fluids Package is set up, press ‘Enter Simulation Environment’, this takes you into the plant main flowsheet

Take some time to familiarise yourself with the HYSYS simulation environment Usually holding your cursor above an icon in the floating toolbar will describe the engineering item associated with it

Back to the simulation

• Select a distillation column: click on the toolbar and again on the main window There may be a wait of a few seconds while HYSYS retrieves the template

• Now select a Material Stream and place it to the left of the column This will be

Stream1

• Double click on stream1 and under Worksheet Properties enter the following data:

Temperature 30 °C Pressure 500 kPa Mass Flow 100 kg/h

• Click on Worksheet Composition and enter mole fractions for each of the components (use integers for now) and then Normalise to 1 To start with try 1, 2, 4, 1, 1, 1.5 as relative compositions

• Close the box down and then double click on the Distillation Column

• Define the Inlet Stream as Stream1 and the Inlet Stage as 15_Main TS with a total of 20 stages The default for the stages is to number down from the top of the column

• Set the condenser to total

• Set the overhead liquid outlet as stream 2

• Set the bottoms outlet as stream 3

• Set the reboiler as energy stream q-101 and the condenser energy stream as q-102

• Press Next

• Set the condenser pressure (Pcond) as 400 kPa (4 bar) and the reboiler pressure (Preb)

as 450 kPa (4.5 bar)

• Press Next and Next again

• Set the Reflux Ratio to 3 and the distillation Liquid Rate to 8 kg/h You will need to set

the materials Flow Basis to Mass

• Now press Done

• You are now ready to run the simulation PRESS Run

If you get any error messages you should try to solve them They are usually self-explanatory

If really you do have a problem, see a demonstrator

Assuming everything has worked it is time to analyse the simulation data

Things you should consider after the simulation has converged:

• What are the compositions of the materials streams leaving the column?

• What are the temperatures of the two output streams and heat flows at q-101 and q-102?

• What are the heat flows and power requirements at q-101 and q-102?

• From the Worksheet you should compare the compositions of the materials streams to establish the efficiency of the separation process What comes off as liquid and what as vapour? How good is the separation?

• You should consider how to design a more efficient process by varying the parameters used (temperatures, materials flow, etc) This can be achieved easily and the simulation re-run each time

• You should include all the above considerations in your report

Now extend the system by adding a Side Draw

• Double-click on the distillation column

• On the Design tab select Side Draws

• Under tray Selection choose the Vapour radio button and set the vapour draw to 4 (to give materials stream 4)

• Select a Tray Number from the dropdown menu Start low, e.g 10_Main TS, bearing in mind where the input stream enters the column

• You will need to define the draw rate on the side draw, start with 2 kg/h and vary this during the course of your simulation

Things you should consider:

• Re-run the above simulation to see how adding a side draw effects separation This should again be performed using a range of initial parameters as above

• Change the Tray Number and study the effect

• Change the Side Draw Rate and again note the effect

Deciding on a final design for the column

Explore the initial parameters used to define the simulation system and their effect on

separation Design a column to maximise:

• Removal of the heavier fractions (pentanes and hexanes)

• Separate as efficiently as possible n-butane and i-butane

• Cost (simple design with low energy requirements)

Your Report

• Use the same formal as in previous sessions (Introduction, Results and Discussion, Conclusions)

• Enter considerations of initial parameters and discuss the implications in the Results and Discussions section

• Justify tour chosen design in the Conclusions section