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Validation of online monitoring of PFC by QCL with FTIR spectroscopy

Validation of online monitoring of PFC by QCL with FTIR spectroscopy

Category
Journal publication
Abstract
Monitoring of perfluorocarbon (PFC) evolution from aluminium smelting is gaining attention, not only because of their high greenhouse gas potentials but also due to process optimization purposes. Conventionally, PFC monitoring has been conducted by extractive sampling and subsequent analysis by fourier transform infrared (FTIR) spectroscopy. With FTIR, the quantification can be performed by IR spectral features specific for PFC. The downside is a requirement of gas scrubbing to remove HF detrimental to the instrument as well as relatively poor gas dynamics due to the large internal gas volume of the instrument. With emerging quantum cascade laser (QCL) technology, online monitoring can now be conducted with duct mounted lasers with calcium fluoride optical windows. However, due to a strong spectral overlap of CF4 and other gas constituents present in the process (e.g. methane), the QCL instruments currently suffer from some cross-interference. In this work, QCL single cell PFC monitoring has been validated by simultaneous monitoring with FTIR.
Language
English
Author(s)
Affiliation
  • SINTEF Industry / Sustainable Energy Technology
  • SINTEF Digital / Smart Sensor Systems
  • Norsk Hydro ASA
  • Norsk Elektro Optikk AS
Year
2018
Published in
The Minerals, Metals & Materials Series
ISSN
2367-1181
Page(s)
1487 - 1493