Aluminum Smelters

Advanced Optical Technologies for Emissions and Airflow Monitoring in Aluminum Smelting

Aluminum smelting is a highly energy-intensive process that produces substantial emissions, including hydrogen fluoride (HF), sulfur dioxide (SO₂), and particulate matter. Managing airflow effectively within pot rooms and associated ventilation systems is critical—not only to minimize fugitive emissions, but also to safeguard worker health and maintain process integrity.

Conventional airflow measurement and gas detection techniques often under-perform in the extreme operating conditions of aluminum smelters, where high temperatures, corrosive gases, and heavy particulate loading are common. In contrast, advanced optical instrumentation provides a robust, high-accuracy alternative that overcomes these limitations.

OPSIS DOAS Gas Analysis
The OPSIS Differential Optical Absorption Spectroscopy (DOAS) system enables continuous, multi-gas monitoring for key smelter emissions including HF, SO₂, NOx, and VOCs. The system provides real-time measurement across long optical paths, enabling accurate quantification of stack, duct, and ambient air emissions without sample extraction. OPSIS DOAS is particularly effective in detecting fugitive releases and validating compliance with environmental standards.

Additionally, OPSIS offers fenceline monitoring systems that provide perimeter-based air quality surveillance. These systems help detect and track emissions beyond the facility boundary, supporting environmental impact assessments and community health protection.

There are multiple reasons for choosing OPSIS as supplier of systems for gas analysis. Among the key benefits of the methods and solutions offered by OPSIS are:

• One system for all components
• A single system can measure at several monitoring points
• Combines the benefits of the UV-DOAS, FTIR-DOAS, and TDL techniques
• Best performance according to QAL1 certification
• Longest calibration interval according to QAL1 certification
• Optional automatic QAL3 control
• Non-contact monitoring, no sampling
• Long maintenance interval
• Low energy consumption
• Gas calibration only once a year
• Thousands of systems installed worldwide

Link is for a variety of short informational videos found on the OPSIS website : OPSIS Play

Contact us for more information

Sales is restricted to the province of Quebec and the Maritime Provinces.

Optical Scientific, Inc. (OSI) optical scintillation anemometry offers a non-intrusive, path-integrated method for measuring airflow and emissions in large ducts and open pot room environments. It is ideally suited for high-temperature, dusty, and chemically aggressive conditions. OSI systems deliver real-time data with high resolution, minimal signal degradation, and low maintenance requirements—making them a dependable choice for continuous ventilation and emissions monitoring in very difficult and demanding environments.

For more information refer to our product page: Optical Scintillation