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Comparison of Measurement Techniques for Temperature and Soot Concentration in Premixed, Small-Scale Burner Flames
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-6473-7090
RISE-Energy Technology Center AB .
Umeå University, Thermochemical Energy Conversion Laboratory, Department of Applied Physics and Electronics.
Umeå University, Thermochemical Energy Conversion Laboratory, Department of Applied Physics and Electronics.
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2017 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 31, no 10, p. 11328-11336Article in journal (Refereed) Published
Abstract [en]

Optical and intrusive measurement techniques for temperature and soot concentration in hot reacting flows were tested on a small-scale burner in fuel-rich, oxygen-enriched atmospheric flat flames produced to simulate the environment inside an entrained flow reactor. The optical techniques comprised two-color pyrometry (2C-PYR), laser extinction (LE), and tunable diode laser absorption spectroscopy (TDLAS), and the intrusive methods included fine-wire thermocouple thermometry (TC) and electrical low pressure impactor (ELPI) particle analysis. Vertical profiles of temperature and soot concentration were recorded in flames with different equivalence and O2/N2 ratios. The 2C-PYR and LE data were derived assuming mature soot. Gas temperatures up to 2200 K and soot concentrations up to 3 ppmv were measured. Close to the burner surface, the temperatures obtained with the pyrometer were up to 300 K higher than those measured by TDLAS. Further away from the burner, the difference was within 100 K. The TC-derived temperatures were within 100 K from the TDLAS results for most of the flames. At high signal-to-noise ratio and in flame regions with mature soot, the temperatures measured by 2C-PYR and TDLAS were similar. The soot concentrations determined with 2C-PYR were close to those obtained with LE but lower than the ELPI results. It is concluded that the three optical techniques have good potential for process control applications in combustion and gasification processes. 2C-PYR offers simpler installation and 2D imaging, whereas TDLAS and LE provide better accuracy and dynamic range without calibration procedures.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017. Vol. 31, no 10, p. 11328-11336
National Category
Energy Engineering
Research subject
Energy Engineering
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URN: urn:nbn:se:ltu:diva-65767DOI: 10.1021/acs.energyfuels.7b01168ISI: 000413710300104Scopus ID: 2-s2.0-85032857034OAI: oai:DiVA.org:ltu-65767DiVA, id: diva2:1143717
Note

Validerad;2017;Nivå 2;2017-11-09 (andbra)

Available from: 2017-09-22 Created: 2017-09-22 Last updated: 2018-05-02Bibliographically approved

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Ögren, YngveWiinikka, Henrik

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