Document Type Master's Dissertation Author Muller, Cornelius Jacobus email@example.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
- state-space model
- model predictive control
- dynamic model
- real-time optimization
Date 2011-09-14 Availability unrestricted AbstractIn 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.
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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/ >
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