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  • Aspen HYSYS

    www.cadfamily.comThe document is forUser GuideDynamics EMail:cadserv21@hotmail.com study only,if tort to your rights,please inform us,we will delete

  • www.cThe doVersion Number: 7.0

    Copyright (c) 1981-2008 by Aspen Technology, Inc. All rights reserved.

    Aspen HYSYS, Aspen HYSYS Dynamics, Aspen RefSYS, Aspen HYSYS Refining, Aspen FLARENET, Aspen Flare System Analyzer, Aspen HX-Net, Aspen Energy Analyzer, Aspen RefSYS Catcracker(FCC), Aspen HYSYS Refining CatCracker, Aspen HYSYS PIPESYS, and Aspen HYSYS Pipeline Hydraulics, are trademarks or registered trademarks of Aspen Technology, Inc., Burlington, MA.

    All other brand and product names are trademarks or registered trademarks of their respective companies.

    This manual is intended as a guide to using AspenTechs software. This documentation contains AspenTech proprietary and confidential information and may not be disclosed, used, or copied without the prior consent of AspenTech or as set forth in the applicable license agreement. Users are solely responsible for the proper use of the software and the application of the results obtained.

    Although AspenTech has tested the software and reviewed the documentation, the sole warranty for the software may be found in the applicable license agreement between AspenTech and the user. ASPENTECH MAKES NO WARRANTY OR REPRESENTATION, EITHER EXPRESSED OR IMPLIED, WITH RESPECT TO THIS DOCUMENTATION, ITS QUALITY, PERFORMANCE, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE.

    Aspen Technology, Inc.200 Wheeler RoadBurlington, MA 01803-5501USAPhone: (781) 221-6400Website http://www.aspentech.comadfamily.com EMail:cadserv21@hotmail.comcument is for study only,if tort to your rights,please inform us,we will delete

  • www.cThe doadfamily.com EMail:cadserv21@hotmail.comcument is for study only,if tort to your rights,please inform us,we will delete

  • v

    v

    Technical Support

    Online Technical Support Center ........................................................ vi

    Phone and E-mail .............................................................................. vii

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    w.cadfamily.com EMail:cadserv21@hotmail.come document is for study only,if tort to your rights,please inform us,we will delete

  • vi

    vi

    Online Technical Support

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    ThCenterAspenTech customers with a valid license and software maintenance agreement can register to access the Online Technical Support Center at:

    http://support.aspentech.com

    You use the Online Technical Support Center to:

    Access current product documentation Search for technical tips, solutions, and frequently asked

    questions (FAQs) Search for and download application examples Search for and download service packs and product

    updates Submit and track technical issues Send suggestions Report product defects Review known deficiencies and defects

    Registered users can also subscribe to our Technical Support e-Bulletins. These e-Bulletins proactively alert you to important technical support information such as:

    Technical advisories Product updates and releasesw.cadfamily.com EMail:cadserv21@hotmail.come document is for study only,if tort to your rights,please inform us,we will delete

  • vii

    ii

    Phone and E-mail

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    Customer support is also available by phone, fax, and e-mail for customers who have a current support contract for their product(s). Toll-free charges are listed where available; otherwise local and international rates apply.

    For the most up-to-date phone listings, please see the Online Technical Support Center at:

    http://support.aspentech.comw.cadfamily.com EMail:cadserv21@hotmail.come document is for study only,if tort to your rights,please inform us,we will delete

  • viii

    iii

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  • Table of ContentsTechnical Support..................................................... v

    Online Technical Support Center ............................vi

    Phone and E-mail................................................ vii

    1 Dynamic Theory....................................................1-1

    1.1 Introduction .................................................... 1-3

    1.2 General Concepts ............................................. 1-6

    1.3 Holdup Model .................................................1-13

    1.4 Pressure Flow Solver .......................................1-29

    1.5 Dynamic Operations: General Guidelines ............1-42

    1.6 Aspen HYSYS Dynamics ...................................1-49

    1.7 References .....................................................1-71

    2 Dynamic Tools ......................................................2-1

    2.1 Introduction .................................................... 2-3

    2.2 Dynamics Assistant .......................................... 2-4

    2.3 Equation Summary Property View......................2-28

    2.4 Integrator ......................................................2-38

    2.5 Event Scheduler..............................................2-45

    2.6 Control Manager .............................................2-72

    2.7 Dynamic Initialization ......................................2-73

    3 Control Theory......................................................3-1

    3.1 Introduction .................................................... 3-2

    3.2 Process Dynamics ............................................ 3-3

    3.3 Basic Control ..................................................3-10

    3.4 Advanced Control ............................................3-32

    3.5 General Guidelines ..........................................3-39

    3.6 References .....................................................3-58ix

    Index.................................................................... I-1

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  • Dynamic Theory 1-1

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    1 Dynamic Theory

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    1.6.1 Detailed Heat Model ............................................................... 511.6.2 Nozzles................................................................................. 531.6.3 Control Valve Actuator ............................................................ 571.6.4 Inertia .................................................................................. 621.6.5 Static Head ........................................................................... 681.6.6 Design.................................................................................. 71w.cadfamily.com EMae document is for study 1.1 Introduction................................................................................... 3

    1.2 General Concepts ........................................................................... 6

    1.2.1 Mathematical Model Classification............................................... 6

    1.3 Holdup Model ............................................................................... 13

    1.3.1 Assumptions of Holdup Model .................................................. 141.3.2 Accumulation......................................................................... 141.3.3 Non-Equilibrium Flash ............................................................. 151.3.4 Heat Loss Model..................................................................... 201.3.5 Chemical Reactions................................................................. 231.3.6 Related Calculations ............................................................... 241.3.7 Advanced Holdup Properties .................................................... 24

    1.4 Pressure Flow Solver ................................................................... 29

    1.4.1 Simultaneous Solution in Pressure Flow Balances........................ 301.4.2 Basic Pressure Flow Equations.................................................. 311.4.3 Pressure Flow Specifications .................................................... 34

    1.5 Dynamic Operations: General Guidelines ..................................... 42

    1.5.1 Differences between Dynamic & Steady State Mode .................... 431.5.2 Moving from Steady State to Dynamics ..................................... 44

    1.6 HYSYS Dynamics.......................................................................... 49il:cadserv21@hotmail.comonly,if tort to your rights,please inform us,we will delete

  • 1-2 Dynamic Theory

    1.7 References....................................................................................71

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  • Dynamic Theory 1-3

    -3

    1.1 Introduction

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    Dynamic simulation can help you to better design, optimize, and operate your chemical process or refining plant. Chemical plants are never truly at steady state. Feed and environmental disturbances, heat exchanger fouling, and catalytic degradation continuously upset the conditions of a smooth running process. The transient behavior of the process system is best studied using a dynamic simulation tool like Aspen HYSYS.

    The design and optimization of a chemical process involves