Post on 23-Feb-2018
transcript
7/24/2019 HYSYS Dynamics, Software
1/23
2010 Aspen Technology, Inc. All rights reserved
Wim Van Wassenhove
Aspentech
HYSYS Dynamics
Why Dynamic Modeling and howdoes it work?
7/24/2019 HYSYS Dynamics, Software
2/23
2010 Aspen Technology, Inc. All rights reserved | 2
Why dynamic simulation?
A properly operating plant = Increased benefits
Some of the common plant problems
Start-ups taking too long
Too much off-spec product
Capacity limited because of operability problems
Violating environmental law can be very expensive
2
7/24/2019 HYSYS Dynamics, Software
3/23
2010 Aspen Technology, Inc. All rights reserved | 3
Why dynamic simulation?
Overdesign of security equipment to ensure safety
Energy efficient plants are usually less stable
Finding out the problems late is expensive
Tuning operation directly on the plant is
Less effective or VERY expensive
Potentially dangerous and source of more problems
3
7/24/2019 HYSYS Dynamics, Software
4/23
2010 Aspen Technology, Inc. All rights reserved | 4
Throughout the plant lifecycle
Process design
Hazop type studies
Pre start-up preparations
Process modifications
Analyse / Troubleshoot operability problems
4
7/24/2019 HYSYS Dynamics, Software
5/23
2010 Aspen Technology, Inc. All rights reserved | 5
What does HYSYS Dynamics offer?
Seamless transition from Steady State to Dynamic
Versatile solver, integrator and flash
Rich choice between simple and detailed modeling
A comprehensive library of operations
Event scheduler
Dynamics extensibility
5
7/24/2019 HYSYS Dynamics, Software
6/23
2010 Aspen Technology, Inc. All rights reserved | 6
Completely integrated with HYSYSSteady State
Same program
Same GUI
Same Thermodynamic models
All input data are shared
Steady State results can be used as initialisation fordynamic simulation
6
Steady State
Dynamic mode
7/24/2019 HYSYS Dynamics, Software
7/23 2010 Aspen Technology, Inc. All rights reserved | 7
Interactive Environment
7
7/24/2019 HYSYS Dynamics, Software
8/23 2010 Aspen Technology, Inc. All rights reserved | 8
Solver, integrator and flash
Layered integration approach Pressure flow solver uses implicit Euler integration
Flash efficiencies for real vessel behaviour
Real nozzle behaviour
Forward and backward flow
8
7/24/2019 HYSYS Dynamics, Software
9/23 2010 Aspen Technology, Inc. All rights reserved | 9
Rich choice between simple and detailedmodeling options
A linear valve with instant action
or
An equal percentage valve with
an actuator with linear rate
an actuator with a defined fail mode
a holdup
An offset to simulate leaking
9
7/24/2019 HYSYS Dynamics, Software
10/23 2010 Aspen Technology, Inc. All rights reserved | 10
Rich choice between simple and detailedmodeling options
A vessel with only the volume given
or
A vessel with
Height and width
Vessel elevation defined Nozzle positions defined
Heat losses defined
Entrainment modeling
Level taps
10
7/24/2019 HYSYS Dynamics, Software
11/23 2010 Aspen Technology, Inc. All rights reserved | 11
A comprehensive library of operations
Vessels
Piping
Reactors
Heat transfer
Distillation columns
Rotating equipment
Logical operations
11
7/24/2019 HYSYS Dynamics, Software
12/23 2010 Aspen Technology, Inc. All rights reserved | 12
12
Control features in HYSYS Dynamics
Boolean Gates:
And, Or, delay,
latch, counter,
Split Range Controller
Ratio Controller
PID Controller
and Feedforward
Generic
MPC Controller
DMCplus Controller
Cause&Effect Matrix
Transfer Function:
Lag, Lead, ramp,
Integrator, 2ndorder,
sine wave,
Override Selector
On/Off ControllerSpreadsheet for
custom calculationsAnti-surge
Controller
7/24/2019 HYSYS Dynamics, Software
13/23 2010 Aspen Technology, Inc. All rights reserved | 13
Spreadsheet
13
7/24/2019 HYSYS Dynamics, Software
14/23
2010 Aspen Technology, Inc. All rights reserved | 14
Event scheduler
Timed and logical execution ofcommands
Applicable to
Shut-down logic
Batch recipes
Repeating scenarios
14
7/24/2019 HYSYS Dynamics, Software
15/23
2010 Aspen Technology, Inc. All rights reserved | 15
User Models
Two Options: Modules developed in a programming language via ActiveX
technology
Modules developed in Aspen Custom Modeler
15
7/24/2019 HYSYS Dynamics, Software
16/23
2010 Aspen Technology, Inc. All rights reserved | 16
Dynamics extensibility
If the model library does not supply the model
Programmable in any OLE-compliant language
Ready built blocks can be used
Legacy code can be integrated
Shares the same interface as the HYSYS models
Can use HYSYS properties
16
7/24/2019 HYSYS Dynamics, Software
17/23
2010 Aspen Technology, Inc. All rights reserved | 17
OLE client and server
17
User created unit operation
7/24/2019 HYSYS Dynamics, Software
18/23
2010 Aspen Technology, Inc. All rights reserved
How to transition fromSteady State to Dynamics
7/24/2019 HYSYS Dynamics, Software
19/23
2010 Aspen Technology, Inc. All rights reserved | 19
Transition from Steady State to DynamicsFive Steps to Get There
Add missing Equipment
Size all Equipment
Set the Pressure Flow Specifications
Add Process Control
Set up visualisation and possibly scenarios
7/24/2019 HYSYS Dynamics, Software
20/23
2010 Aspen Technology, Inc. All rights reserved | 20
Add Missing Equipment
A Steady State Model is like a PFD
A Dynamic Model is like a P&ID
Number one missing items are valves
Keep in mind the purpose of the model
If no shutdown modelling is required, why add block valves?
7/24/2019 HYSYS Dynamics, Software
21/23
2010 Aspen Technology, Inc. All rights reserved | 21
Equipment Sizing
Sizing info is almost always on the Rating or Dynamics Tabs
Use actual information as much as possible
HYSYS can estimate some data, but only use if no data
Valve Sizing
Pump Curve Generation
Vessel sizing
Level of detail required in sizing depends on model purpose
No need to add level taps unless level measurement is key
For very fast processes, valve dynamics may be essential
7/24/2019 HYSYS Dynamics, Software
22/23
2010 Aspen Technology, Inc. All rights reserved | 22
Pressure Flow Specs
Pressure-flow specifications and relationships
Material Streams
Pressure specification
Flow specification
Select one of the two Usually only on boundary streams
Equipment
Fixed Pressure drop (Rarely used)
Pressure/Flow equation (prefererd, it is more realistic)
Resistance calculation (for valves)
Conductance Calculation (for process equipment)
7/24/2019 HYSYS Dynamics, Software
23/23
2010 Aspen Technology Inc All rights reserved | 23
Add Process Control
A model can run without controllers But can your process run without them?
Usually essential to keep the process operating
Liquid levels are usually the first ones to control
Enter controllers as on the P&ID
Make sure you have sensor ranges (= PV Range)
Make sure you have the controller tunings