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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