On-Line Monitoring Of Products Generated In The Combustion Of Polymeric Materials Using Fourier Transform Infrared Spectroscopy

Marc R. Nyden

doi:10.1117/12.969577

1 December 1989 On-Line Monitoring Of Products Generated In The Combustion Of Polymeric Materials Using Fourier Transform Infrared Spectroscopy

Marc R. Nyden

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Proceedings Volume 1145, 7th Intl Conf on Fourier Transform Spectroscopy; (1989) https://doi.org/10.1117/12.969577
Event: Seventh International Conference on Fourier and Computerized Infrared Spectroscopy, 1989, Fairfax, VA, United States

Abstract

The distribution of products which evolve during the course of a fire is sensitive to prevailing conditions of temperature, fuel composition, and oxygen availability. The dynamic nature of the combustion process has implications for the design and safe operation of controlled burning units such as municipal and hazardous waste incinerators. Spectroscopic measurements provide a means for obtaining a continuous signature of the incineration process which is suitable for input into a servo-mechanism which is designed to achieve optimal combustion efficiency. We have designed and constructed a facility for making time-resolved concentration measurements of combustion effluents. The setup consists of an FTIR spectrometer interfaced to an oxygen consumption calorimeter through a heated sample line. The gases which are evolved during the combustion of bulk materials, typically wood and plastics, are pulled through the sample line into a thermostatted gas cell at a rate of≈ 30 ℓ/min. Interferograms are co-added over 30 second intervals and processed into absorbance spectra with a resolution of = 0.5 cm-1. The concentrations for a small number of target compounds are determined from numerically robust curve-fitting techniques which make use of predetermined analytical windows and the derivative spectra obtained from a representative spectral data base. The details of our methodology and spectral data collected during the combustion of representative materials will be presented. The possibility of integrating this information into a useful model of incinerator performance will also be discussed.

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Marc R. Nyden "On-Line Monitoring Of Products Generated In The Combustion Of Polymeric Materials Using Fourier Transform Infrared Spectroscopy", Proc. SPIE 1145, 7th Intl Conf on Fourier Transform Spectroscopy, (1 December 1989); https://doi.org/10.1117/12.969577

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KEYWORDS

Combustion

FT-IR spectroscopy

Spectroscopy

Oxygen

Polymers

Absorbance

Gases

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