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Comparison of measurement techniques for temperature and soot concentration in premixed, small-scale burner flames
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. (Applied Laser Spectroscopy, TEC-Lab)
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. (Applied Laser Spectroscopy, TEC-Lab)ORCID iD: 0000-0002-5065-7786
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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
Washington: American Chemical Society (ACS), 2017. Vol. 31, no 10, p. 11328-11336
Keywords [en]
flow coal gasifier, volume fraction, wavelength dependence, optical diagnostics, refractive index, gas temperature, pyrometry, biomass, size, extinction
National Category
Atom and Molecular Physics and Optics Energy Systems Chemical Process Engineering
Identifiers
URN: urn:nbn:se:umu:diva-141034DOI: 10.1021/acs.energyfuels.7b01168ISI: 000413710300104OAI: oai:DiVA.org:umu-141034DiVA, id: diva2:1151103
Available from: 2017-10-22 Created: 2017-10-22 Last updated: 2018-06-09Bibliographically approved

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Qu, ZhechaoSchmidt, Florian M.

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