Basic Tutorial on Aspen HYSYS Dynamics - Process Control

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: Hamed Hoorijani
Tutorial Aspen HYSIS v8.8- Dynamic mode
Dynamic process 1
Author: Hamed Hoorijani

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: Hamed Hoorijani
Tutorial 2. Simulate below gas process in steady state and dynamic using the
provided data.
Supplementary data:
Feed composition: Feed operating condition
Proper Fluid Package: Peng-Robinson
 Pressure drop for the gas-gas heat exchanger on the tube side is 35 kPa and
in shell side 5kPa.
Temperature(℃) 0
Pressure(kPa) 6200
Molar
Flow(kgmole/h)
1440
Gas Plant Feed
Components %Mole
N2 0.0066
H2S 0.0003
CO2 0.0003
C1 0.7576
C2 0.1709
C3 0.0413
i-C4 0.0068
n-C4 0.0101
i-C5 0.0028
n-C5 0.0027
C6 0.0006
H2O 0

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 Consider the Minimum approach temperature for the gas-gas heat exchanger
as 5℃.
 Solve the gas-gas exchanger using weighted model.
 Specs for the chiller is as: -20℃ for the outlet stream and pressure drop in
exchanger as 35 kPa.
For dynamic mode try to maintain the liquid level in the first separator at
50% with controlling the liquid flow from this separator and control the
system’s pressure by controlling the flow of Sale Gas.
You can use below settings for dynamic mode simulation:
 Consider the separator’s volume at 2 m3
and size the valves.

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Solution.
1. First open Aspen HYSIS and create a new case.
2. Add the given materials at the Properties/Component Lists
3. Add the proper fluid package “Peng-Robinson” at the Properties/Fluid
Packages

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4. At the simulation section define a material stream and set the operating
conditions of the feed and at the composition tab enter the given
composition for feed stream.

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5. Place appropriate process equipment as the given PFD on the path of the
process flow.
Set the given operating conditions for each equipment.

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Separators
V-100 (1st
Separator)
Feed stream: Gas Plant Feed
Gas Product stream: 2 Liquid Product stream: 3
(No need for any specific settings for steady state simulation.)
V-101 (2nd
Separator)
Feed stream: 5
Gas Product stream: 6 Liquid Product stream: LNG
(No need for any specific settings for steady state simulation.)
Heat Exchangers
E-100 (gas-gas heat exchanger)
Tube side inlet stream: 2 Shell side inlet stream: 6
Tube side outlet stream: 4 Shell side outlet stream: Sale
Gas
Tube side pressure drop: 35 kPa Shell side pressure drop: 5 kPa
Simulation Hint:
1. At the Design/Parameters define the pressure drops of the tube and
shell sides. 2. At Design/Specs in the specifications section press the
Add button and in the opened window choose the “Min Approach”
option from the types and set the specified value as 5 as given in the
question.
3. Return to the Design/Parameters and change the “Heat Exchanger
Model” to Simple Weighted.

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E-101 (Chiller)
Feed stream: 4 Outlet stream: 5 Energy stream: QQ
Exchangers pressure drop: 35 kPa

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Valves
VLV-100, 101, 102
Consider pressure drop for each valve in its process stream as: 5 kPa
Simulation Hint:
As the Aspen HYSIS have backward calculations for solving the
mathematical models there shouldn’t be any problems for getting results
after setting each equipment in the PFD.
6. After setting each equipment’s operating conditions, use quick size and
valve size on the separator and valve rating’s tab, respectively.
Vessel sizing:
In the separator settings, try Rating tab and sizing in the Rating’s tree
chart  “Quick Size”

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Valve Sizing:
For the valve sizing, try Rating tab and sizing in the Rating’s tree
chart  “Size Valve”
7. Now you have the results of the steady state simulation.
8. Now place the PID controllers on the workspace and define their settings as
given data in the tables.

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The PIC-100 controller:
The LIC-100 controller:
9. Use the Dynamic Assistant for tips and required changes for transforming
your simulation from steady state to dynamic simulation.

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Press the Make Changes on the Dynamic assistant’s window to make that
happens.
10.In the PID controller settings window in the StripChart choose the
appropriate variables to display on the charts to study the changes of each
variable for each controller.

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11.In the Dynamics tab using Integrator/General you can specify the start, end
time and time steps for your dynamic simulations.

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Simulation hint:
 Try using Integrator simultaneously with Stripcharts to have the
displays of the controllers at the same time.
 You can add some options such as considering static head in the
calculations to your dynamic simulation in the Integrator/options.

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: hamed hoorijani
: Hamed Hoorijani

Basic Tutorial on Aspen HYSYS Dynamics - Process Control

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