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Proceedings Paper

Low-resolution FTIR continuous monitoring/process control system to minimize HCl emissions in aluminum casting operations
Author(s): Thomas A. Dunder
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Paper Abstract

In a Department of Energy funded project, a low resolution Fourier Transform IR Continuous Emissions Monitoring (FTIR CEM) and Process Control system was developed and evaluated for use in minimizing HCl emissions during aluminum casting operations. In the casting process, molten aluminum is treated by fluxing with chlorine to remove alkali and hydrogen impurities. The industry has traditionally used a stoichiometric excess of chlorine to ensure metal quality, with resulting atmospheric emissions of HCl. The FTIR system can potentially be used to reduce emission when employed as a closed-loop process control device to monitor the HCl concentration and thereby reduce chlorine usage while maintaining product quality. In the initial project phase, tests were conducted under varying process conditions at a pilot-scale casting facility. The goals of these test included demonstrating that the FTIR monitor could provide closed-loop control of chlorine use, correlating HCl emission with metal quality, and verifying that the instrumentation could operate under harsh casting facility conditions. The system will subsequently be tested at two aluminum production facilities. This paper summarizes the results from the initial evaluation of the FTIR CEM/Process Control system.

Paper Details

Date Published: 9 December 1999
PDF: 10 pages
Proc. SPIE 3859, Optical Online Industrial Process Monitoring, (9 December 1999); doi: 10.1117/12.372942
Show Author Affiliations
Thomas A. Dunder, Entropy, Inc. (United States)

Published in SPIE Proceedings Vol. 3859:
Optical Online Industrial Process Monitoring
Robert J. Nordstrom; Wim A. de Groot, Editor(s)

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