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Executive Summary: Design Report

The document provides a design report for a natural gas pretreatment process. It includes an executive summary describing the objectives to complete preliminary mass and energy balances and select materials of construction. It then describes the process, which cools raw natural gas, flashes it to produce gas and liquid streams, further cools the gas stream, and sends it through a Joule-Thomson valve before flashing again. Aspen Plus simulation was used to obtain preliminary mass and energy balances for the process streams. Tables of results are presented.

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Ahmed Younis
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93 views3 pages

Executive Summary: Design Report

The document provides a design report for a natural gas pretreatment process. It includes an executive summary describing the objectives to complete preliminary mass and energy balances and select materials of construction. It then describes the process, which cools raw natural gas, flashes it to produce gas and liquid streams, further cools the gas stream, and sends it through a Joule-Thomson valve before flashing again. Aspen Plus simulation was used to obtain preliminary mass and energy balances for the process streams. Tables of results are presented.

Uploaded by

Ahmed Younis
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Design Report

Executive Summary
Sustainable HC Pty Ltd requested to complete a process design for their process (PFD shown in
figure 1). It is a natural gas pretreatment process. One of this work objectives of is carrying out a
preliminary mass and energy balances for the unit operations that help in building more detailed
process design in the next design stages.
Another objective is the selection of material of construction (MOC) for the process equipment
and pipelines and make optimization study for the selected materials to judge the most suitable
and economic ones.

Figure 1 Process PFD Supplied by the Client

1
Design Report

Project Description
The natural gas obtained from well is cooled in the heat exchanger (E-1000) then flashed in the
vessel (V-1000) which produce 2 Streams one is in gas phase and the other is liquid condensate.
The Gas stream is cooled through exchanger (E-1100) with vapor stream from (V-1100).
The cooled stream goes through Joule –Thomson valve (JT-Valve) and flashed at (V-1100).
The vapor stream from this vessel compressed

Methodology
Aspen plus Simulation was done to make preliminary mass balance and energy balance with the
available data. For identifying the gas feed (Stream -001) the flow rate assumed equal to 100,000 cubic
feet /day. Pressure 70 psig and temperature of 93 °C.

2
Design Report

Part-A
Mass and energy balance results for all process streams which obtained from Aspen Plus Simulation

Stream Number 001 002 003 004 005


Pressure(barg) 9383.965 9383.965 6280.070 3103.894 6280.070
Temperature(°C) 93.33 65.56 50.00 50.00 28.72
Mass Flow
(Kg/hr.) 70.00 69.31 33.46 33.46 18.46
Composition
(mol. %)
H2S 0.030 0.030 0.030 0.027 0.030
Methane 0.750 0.750 0.842 0.128 0.842
Ethane 0.020 0.020 0.021 0.013 0.021
Iso-butane 0.050 0.050 0.046 0.076 0.046
n-butane 0.029 0.029 0.022 0.075 0.022
Iso-pentane 0.010 0.010 0.007 0.031 0.007
n-pentane 0.015 0.015 0.008 0.066 0.008
n-hexane 0.015 0.015 0.007 0.072 0.007
n-heptane 0.045 0.045 0.010 0.281 0.010
n-octane 0.005 0.005 0.001 0.035 0.001
n-nonane 0.010 0.010 0.000 0.075 0.000
n-decane 0.010 0.010 0.000 0.076 0.000
H2O 0.001 0.001 0.000 0.008 0.000

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