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Simultaneous diagnostics of fuel moisture content and equivalence ratio during combustion of liquid and solid fuels
RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.ORCID iD: 0000-0003-2253-6845
RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.ORCID iD: 0000-0002-6473-7090
RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.
RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.ORCID iD: 0000-0002-9395-9928
2022 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 324, article id 119731Article in journal (Refereed) Published
Abstract [en]

The precise control of bio-based combustion is challenging due to the varying composition and moisture content of the fuels, difficulties in achieving stable fuel feeding, and complex underlying thermochemical processes. We present simultaneous online diagnostics of two combustion parameters, the equivalence ratio and fuel moisture content, in a pilot-scale environment. The parameters were evaluated by analysing the H2O and CO2 concentrations. These were measured using a Fourier transform infrared (FTIR) spectrometer (exhaust) and tuneable diode laser (TDL) absorption spectroscopy (combustion chamber) in pilot-scale diesel and pulverized biomass combustion. Liquid H2O was added into the combustion chamber to represent fuel moisture. The equivalence ratio of diesel and wood combustion was varied by adjusting the flows of combustion air in a staged manner or by using rapid periodic variations (on the order of seconds). The moisture fuel levels calculated using the measured fuel and water flow rates (flow method) and the FTIR and TDL H2O and CO2 concentrations agree within 3% (absolute) for both fuels. The TDL and FTIR equivalence ratios agreed quantitatively for both diesel and biomass combustion. However, close to stoichiometry, the TDL values for biomass are up to 15% lower than the FTIR values, indicating ongoing combustion at the location of the TDL measurements. © 2022 The Authors

Place, publisher, year, edition, pages
Elsevier Ltd , 2022. Vol. 324, article id 119731
Keywords [en]
Biomass, Entrained flow reactor, Equivalence ratio, Fuel moisture content, tuneable diode laser absorption spectroscopy (TDLAS), Absorption spectroscopy, Carbon dioxide, Combustion, Combustion chambers, Diesel engines, Flow of water, Fourier transform infrared spectroscopy, Fuels, Moisture determination, Semiconductor lasers, Spectrometers, Biomass combustion, CO 2 concentration, Diode-laser, Equivalence ratios, Fourier transform infrared, Pilot scale, Tuneable diode laser absorption spectroscopies, Tuneable diode laser absorption spectroscopy
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:ri:diva-59893DOI: 10.1016/j.apenergy.2022.119731Scopus ID: 2-s2.0-85134966967OAI: oai:DiVA.org:ri-59893DiVA, id: diva2:1686832
Note

Correspondence Address: Sepman, A.; RISE AB, Box 726, Sweden; email: alexey.sepman@ri.se; Funding details: Energimyndigheten; Funding text 1: We gratefully acknowledge financial support from the Swedish Energy Agency through the 50470-1 project.

Available from: 2022-08-11 Created: 2022-08-11 Last updated: 2023-05-19Bibliographically approved

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Sepman, AlexeyÖgren, YngveWiinikka, Henrik

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