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Two Stage Compression

Engr. Syed Zaheer Abbas

Chemical Engineering Department

University of Engineering & Technology

Lahore

mailto:engr_zaheer@uet.edu.pk

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Process Description

2Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

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Learning Objectives

3Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

After you have completed this section youwill be able to:

Use Compressors in Aspen HYSYSUse Recycle Operation in Aspen HYSYS

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Building the Simulation

4Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

Basis environment enables you to specify thebasic information like components, property

package, reactions and so forth associated to

the simulation.

Case environment enables you to specify the

streams and operation equipment associated

to the simulation, and view the calculated

results from the simulation.

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1) Component List

5Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

Nitrogen i-Butane

CO2 n-Butane

Methane i-Pentane

Ethane n-Pentane

Propane n-Hexane

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2) Defining a Fluid Package

6Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

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Entering the Simulation

Environment

7Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

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Installing Feed Streams

8Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

Add a Material Stream

Name To Compression

Temperature (C) 35

Pressure (kPa) 1725

Molar Flow (kgmole/h) 5000

Component Mole Fraction Component Mole Fraction

Nitrogen 0.0075 i-Butane 0.0652

CO2 0.0147 n-Butane 0.0578

Methane 0.5069 i-Pentane 0.0515

Ethane 0.1451 n-Pentane 0.0431

Propane 0.0725 n-Hexane 0.0357

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Building the Simulation without

the Recycle Operation

9Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

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1. Installing a Mixer

10Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

Connections

Name Mixer 1

Inlet To Compression

Outlet To LP Sep

Parameters

Pressure Assignment Equalize all

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2. Installing a Separator

11Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

Connections

Name LP Sep

Inlet To LP Sep

Vapor Outlet LP Sep Vap

Liquid Outlet LP Sep Liq

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3. Installing a Compressor

Process Modeling by12Engr. S. Zaheer Abbas

Connections

Name Stage 1

Inlet LP Sep Vap

Outlet Stage 1 Out

Energy Stage 1 HP

Parameters

Adiabatic Efficiency 75% (Default)

Worksheet

Stage 1 Out, Pressure 3450 kPa

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4. Installing a Cooler

13Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

Connections

Name Stage 1 Cooler

Inlet Stage 1 Out

Outlet Cooler 1 Out

Energy Stage 1 Q

Parameters

Pressure Drop 0 kPa

Worksheet

Cooler 1 Out, Temperature 50C

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5. Installing 2nd Mixer

14Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

Connections

Name Mixer 2

Inlet Cooler 1 Out

Outlet To IS Sep

Parameters

Pressure Assignment Equalize all

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6. Installing Separator

15Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

Connections

Name IS Sep

Inlet To IS Sep

Vapor Outlet IS Sep Vap

Liquid Outlet IS Sep Liq

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7. Installing a Valve

16Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

Connections

Name Let Down 1

Inlet IS Sep Liq

Outlet LD1 Out

Worksheet

LD1 Out, Pressure 1725 kPa

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8. Installing 2nd Compressor

17Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

Connections

Name Stage 2

Inlet IS Sep Vap

Outlet Stage 2 Out

Energy Stage 2 HP

Parameters

Adiabatic Efficiency 75% (Default)

Worksheet

Stage 2 Out, Pressure 6900 kPa

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9. Installing 2nd Cooler

18Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

Connections

Name Stage 2 Cooler

Inlet Stage 2 Out

Outlet Cooler 2 Out

Energy Stage 2 Q

Parameters

Pressure Drop 0 kPa

Worksheet

Cooler 2 Out, Temperature 50C

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19Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

10. Installing HP Separator

Connections

Name HP Sep

Inlet Cooler 2 Out

Vapor Outlet HP Sep Vap

Liquid Outlet HP Sep Liq

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11. Installing 2nd Valve

20Process Modeling by using Aspen HYSYS

Engr. S. Zaheer Abbas

Connections

Name Let Down 2

Inlet HP Sep Liq

Outlet LD2 Out

Worksheet

LD2 Out, Pressure 3450 kPa

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21Process Modeling by using Aspen HYSYS

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12. Installing the Recycles

RCY-1:

Inlet: LD1 Out

Outlet: RCY 1 Out

RCY-2:

Inlet: LD2 Out

Outlet: RCY 2 Out

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EXERCISE