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Real-time in situ multi-parameter TDLAS sensing in the reactor core of an entrained-flow biomass gasifier
SP Energy Technology Center, Piteå.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science. SP Energy Technology Center, Piteå.ORCID iD: 0000-0002-6473-7090
Umea Univ, Thermochem Energy Convers Lab, Dept Appl Phys & Elect.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science. SP Energy Technology Center, Piteå.ORCID iD: 0000-0002-9395-9928
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2017 (English)In: Proceedings of the Combustion Institute, ISSN 1540-7489, E-ISSN 1873-2704, Vol. 36, no 3, p. 4541-4548Article in journal (Refereed) Published
Abstract [en]

Tunable diode laser absorption spectroscopy (TDLAS) was used to measure several important process parameters at two different locations inside the reactor of an atmospheric, air-blown 0.1 MWth biomass gasifier. Direct TDLAS at 2298 nm was employed for carbon monoxide (CO) and water vapor (H2O), calibration-free scanned wavelength modulation spectroscopy at 1398 nm for H2O and gas temperature, and direct TDLAS at 770 nm for gaseous elemental potassium, K(g), under optically thick conditions. These constitute the first in situ measurements of K(g) and temperature in a reactor core and in biomass gasification, respectively. In addition, soot volume fractions were determined at all TDLAS wavelengths, and employing fixed-wavelength laser extinction at 639 nm. Issues concerning the determination of the actual optical path length, as well as temperature and species non-uniformities along the line-of-sight are addressed. During a 2-day measurement campaign, peat and stem wood powder were first combusted at an air equivalence ratio (lambda) of 1.2 and then gasified at lambdas of 0.7, 0.6, 0.5, 0.4 and 0.35. Compared to uncorrected thermocouple measurements in the gas stream, actual average temperatures in the reactor core were significantly higher. The CO concentrations at the lower optical access port were comparable to those obtained by gas chromatography at the exhaust. In gasification mode, similar H2O values were obtained by the two different TDLAS instruments. The measured K(g) concentrations were compared to equilibrium calculations. Overall, the reaction time was found to be faster for peat than for stem wood. All sensors showed good performance even in the presence of high soot concentrations, and real-time detection was useful in resolving fast, transient behaviors, such as changes in stoichiometry. Practical implications of in-situ TDLAS monitoring on the understanding and control of gasification processes are discussed.

Place, publisher, year, edition, pages
2017. Vol. 36, no 3, p. 4541-4548
Keywords [en]
Tunable diode laser absorption spectroscopy Biomass gasification Gas temperature Potassium Carbon monoxide
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-73382DOI: 10.1016/j.proci.2016.07.011ISI: 000393412600136Scopus ID: 2-s2.0-85002619768OAI: oai:DiVA.org:ltu-73382DiVA, id: diva2:1301537
Available from: 2019-04-02 Created: 2019-04-02 Last updated: 2019-04-09Bibliographically approved
In thesis
1. Improving the efficiency of entrained flow gasifiers by real time in-situ diagnostics and burner design
Open this publication in new window or tab >>Improving the efficiency of entrained flow gasifiers by real time in-situ diagnostics and burner design
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Optimering av suspensionsförgasare med hjälp av laserdiagnostik och brännardesign
Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2019. p. 110
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-73406 (URN)978-91-7790-348-2 (ISBN)978-91-7790-349-9 (ISBN)
Public defence
2019-06-14, E231, Luleå, 10:00 (English)
Opponent
Supervisors
Available from: 2019-04-04 Created: 2019-04-03 Last updated: 2019-05-17Bibliographically approved

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Ögren, YngveWiinikka, Henrik

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