Title page for ETD etd-04042011-121021


Document Type Master's Dissertation
Author De Clerk, Niel
Email ndeclerk@angloplat.com
URN etd-04042011-121021
Document Title Flash dryer unit optimization through advanced process control
Degree MEng
Department Chemical Engineering
Supervisor
Advisor Name Title
Prof P L de Vaal Supervisor
Keywords
  • flash dryer
  • platinum processing
  • model predictive control
Date 2011-04-19
Availability unrestricted
Abstract
In line with Anglo Americanís asset optimization and environmental policies, the coal burning flash dryer operations at its smelters have been identified for potential optimization by means of advanced process control. For this project, the process and related literature were studied in detail and a revised control philosophy, which includes modifications to the existing basic control structure as well as a hybrid rule and model-predictive advanced control layer, was developed, installed and tested on one of these flash drying operations.

Since commissioning of the APC, the flash dryerís average throughput has increased by more than 6 %, despite higher feed moistures. Furthermore, even though coal consumption has increased slightly, the operation efficiency has improved by almost 5 %. This was made possible by improving the stability of the drying column outlet temperature by approximately 40 %, which in turn enabled the selection of a more optimal setpoint. Recent data has shown that APC utilization now exceeds 95 %. This is indicative of a successful controller installation with good site acceptance.

© 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:

De Clerk, N 2011, Flash dryer unit optimization through advanced process control , MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-04042011-121021/>

C11/106/ag

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