1.0 OBJECTIVE

The objective of this control simulation laboratory is to understand the usage of

condenser, valve and separation process on the process system.

2.0 PROCEDURE

By using ASPENTECH Aspen HYSYS V8.6 software. We create a simulation process based

on the given process condition in first laboratory manual. Step by step procedure was given to

create this process on the program.

Figure 2.1: Aspen HYSYS software.

1. First, select a new project and then properties. At the properties section, added 2

components which is ammonia and water onto the system feed component and used

Advance Pend-Robinson property package.

2. Then at the simulation section, the Stream material icon was selected and named it

into ammonia and water stream. This value on table 2.1 was inserted into it.

Temperature 143.6°C

Pressure 1724 kPa

Molar flowrate 4536 kgmole/hr

Composition (weight percent) Ammonia : 0.2

Water : 0.8

Table 2.1: Properties of ammonia and water stream.

Figure 2.2: Feed stream parameter.

3. After that, select the condenser icon to connect with the feed stream of water and

ammonia and then insert the value as follow. Create a output stream labelled as

stream 2.

Figure 2.3: Condenser flow connection.

Figure 2.4: Condenser working parameter.

4. Then, select a Control Valve icon and connect it into stream 2. Put the parameter

value as given in a manual into the system to reduce the output pressure of the stream

to 1034 kPa. The output stream from the Control Valve was labelled as Stream 3 and

is connected to separator equipment.

Figure 2.5: Control Valve connection.

5. Select the Separator/Flash icon and connected it into Stream 3. This equipment will

separated the vapour and liquid. The upper stream which is vapour stream is for

ammonia. The lower stream was for liquid stream that is water.

Figure 2.6: Separator connection.

3.0 PROCESS FLOW DIAGRAM

Figure 2.7: The finish process flow simulation.

4.0 STREAM SUMMARY

Ammonia and water stream

Temperature 143.6 °C

Pressure 1724 kPa

Molar flow rate 4536 Kgmole/h

Composition Ammonia: 0.2

Water: 0.8

Stream 2

Temperature 143.6 °C

Pressure 1724 kPa

Molar flow rate 4536 Kgmole/h

Stream 3

Temperature 131.6 °C

Pressure 690.0 kPa

Molar flow rate 4536 Kgmole/h

Ammonia Stream

Temperature 131.6 °C

Pressure 690.0 kPa

Molar flow rate 4536 Kgmole/h

Mole fraction(ammonia) 0.8088

Mole fraction(water) 0.1912

Water stream

Temperature 131.6 °C

Pressure 690.0 kPa

Molar flow rate 0 Kgmole/h

Mole fraction(ammonia) 0.2020

Mole fraction(water) 0.7980

5.0 QUESTION AND DISCUSSION

1) What is the temperature of the outlet stream of the condenser?

The temperature of the outlet stream of the condenser should be lower than inlet

stream. However, because of the some error during the data input on simulation

program, the temperature on both stream does not change.

2) What are the mole fractions for ammonia and water in the vapour and liquid stream of

the separator?

Mole fraction for ammonia and water in vapour stream was 0.8088 for ammonia and

0.1912 for water. While, at the liquid stream the mole fraction for ammonia and water

was 0.2020 and 0.7980 respectively.

3) Determine the mass flowrate for outlet stream of the separator?

The mass flow rate for the vapour stream is 7.810x104 kg/h. While, the mass flow rate

for liquid stream is 0. This number is not possible because the flow rate of vapour

stream is too big and there are no flow on liquid stream even thought that there are

water and ammonia composition in there. This error may cause by false data input on

the condenser equipment.