Title page for ETD etd-08232011-113626


Document Type Master's Dissertation
Author Muller, Cornelius Jacobus
Email nelismuller@gmail.com
URN etd-08232011-113626
Document Title Modelling, validation, and control of an industrial fuel gas blending system
Degree MEng
Department Electrical, Electronic and Computer Engineering
Supervisor
Advisor Name Title
Prof I K Craig Supervisor
Keywords
  • validation
  • state-space model
  • model predictive control
  • dynamic model
  • real-time optimization
Date 2011-09-14
Availability unrestricted
Abstract
In industrial fuel gas preparation, there are several compositional properties that must be controlled within specified limits. This allows client plants to use the fuel gas mixture safely without having to adjust and control the composition themselves. The variables to be controlled are the Higher Heating Value (HHV), Wobbe Index (WI), Flame Speed Index (FSI), and Pressure (P). These variables are controlled by adjusting the volumetric flow rates of several inlet gas streams of which some are makeup streams (always available) and some are wild streams that vary in composition and availability (by-products of plants). The inlet streams need to be adjusted in the correct ratios to keep all the controlled variables (CVs) within limits while minimising the cost of the gas blend. Furthermore, the controller needs to compensate for fluctuations in inlet stream compositions and total fuel gas demand (the total discharge from the header). This dissertation describes the modelling and model validation of an industrial fuel gas header as well as a simulation study of three different Model Predictive Control (MPC) strategies for controlling the system while minimising the overall operating cost.

2011 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria.

Please cite as follows:

Muller, CJ 2011, Modelling, validation, and control of an industrial fuel gas blending system, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-08232011-113626/ >

C/11/9/117/ag

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