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Chemsheet Can Be Used As A Very Powerful Tool at The Heart of A Process Simulation Program To Determine The Chemical

This document discusses using ChemSheet, a chemical process simulation program, to model combustion processes. It provides an example using the C-NO system to simulate combustion and vary the temperature from 200-1000°C. The amount of soot (graphite precipitation) is charted as the temperature changes. The formula for varying the temperature with each calculation step is provided. Users can modify parameters marked in red or green and calculate the ChemSheet model to obtain results.

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Thaigroup Cement
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88 views6 pages

Chemsheet Can Be Used As A Very Powerful Tool at The Heart of A Process Simulation Program To Determine The Chemical

This document discusses using ChemSheet, a chemical process simulation program, to model combustion processes. It provides an example using the C-NO system to simulate combustion and vary the temperature from 200-1000°C. The amount of soot (graphite precipitation) is charted as the temperature changes. The formula for varying the temperature with each calculation step is provided. Users can modify parameters marked in red or green and calculate the ChemSheet model to obtain results.

Uploaded by

Thaigroup Cement
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 XLS, PDF, TXT or read online on Scribd
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ChemSheet can be used as a very powerful tool at the heart of a process simulation program to determine the chemical

equilibria and heat balances involved. The concept of streams in ChemSheet is especially helpful in this respect. A stream
is a mixture of non-reacted matter of constant temperature and pressure which is transferred to a reaction zone. Several
such streams can be defined to constitute the material input for an equilibrium calculation.

It is easy to see how, using the concept of streams, ChemSheet can be used to model complex processes and to
supplement existing flowsheet programs and process simulators through its ability to calculate highly complex
multicomponent, multiphase equilibria very quickly and reliably.

In the example on worksheet App a combustion process is simulated using the system C-N-O. While the chemical system
itself is very simple, it provides a good basis for demonstration. Particular attention will be paid to the conditions leading to
the formation of condensed phases (i.e. precipitates formed during the combustion). With the simple data-file used, the
possible precipitates are solid carbon as graphite or diamond.

The temperature is varied such that the result is a chart of the soot formation (precipitated graphite). The formula for the
temperature is in cell E8. You can change the constant values that are marked with red and the formulas that are marked
with green.

You can calculate the model by clicking the Calculate ChemSheet Model command in the ChemSheet menu or by
pressing the Calculate ChemSheet Model button in the ChemSheet toolbar.
ermine the chemical
this respect. A stream
ction zone. Several

esses and to
complex

the chemical system


conditions leading to
data-file used, the

The formula for the


ulas that are marked

eet menu or by
Gas T
Formula for the temperature. It uses C
StepIndex variable to vary the value of 200.000
the cell between the successive
calculation steps. 400.000
600.000
800.000
Conditions 1000.000
200 C
Stream 1 bar Stream
CO2/CO Air (O2/N2) Total precipi
200 C 25 C 10.00
1 bar 1 bar
8.00

Amount/gram/s
Constituents Constituents
CO2 O2 N2 6.00
CO
mol/s mol/s mol/s mol/s 4.00
0.5 2.5 0.5 2
2.00

0.00
100 200 300 400 500 60

Total precipitation Tempera


Total precipitation A/C_DIAMOND_A4 A/C
gram/s gram/s gram/s
9.008 0.000 9.008
8.847 0.000 8.847
3.796 0.000 3.796
0.000 0.000 0.000
0.000 0.000 0.000

Total precipitation
10.00

8.00
Amount/gram/s

6.00

4.00

2.00

0.00
100 200 300 400 500 600 700 800 900 1000 1100
Temperature/C
Thermodynamic data-file
C:\ChemSheet\Data\cno.dat

Options
CalculationInitial cond Previous eqChemSageUpdate
r chaClear ranges
EquilibriumStreams 0 1 1

Number of steps
5

Streams
Name Temperatu Unit Pressure Unit Equilibrium
CO2/CO 200 C 1 bar 0
Air 25 C 1 bar 0

Constituents
Stream Phase ConstituentAmount Unit
CO2/CO GAS CO2 0.5 mol/s
CO2/CO GAS CO 2.5 mol/s
Air GAS O2 0.5 mol/s
Air GAS N2 2 mol/s

Conditions
Option Phase Value Unit
Temperature 200 C
Pressure 1 bar

Targets
Option Phase ConstituentInitial valu Lower limit Upper limit Unit

Results
Option Stream Phase ConstituentComponentOutput ran Unit Headers Comments
Amount C_DIAMOND_A4 #VALUE! gram/s 1 1
Amount C #VALUE! gram/s 1 1
Temperature #VALUE! C 1 1

Status
Phase ConstituentComponentStatus
Comments

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