Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Tunable diode laser absorption spectroscopy diagnostics of potassium, carbon monoxide, and soot in oxygen-enriched biomass combustion close to stoichiometry
RISE - Research Institutes of Sweden, Bioeconomy, ETC Energy Technology Center.ORCID iD: 0000-0003-2253-6845
RISE - Research Institutes of Sweden, Bioeconomy, ETC Energy Technology Center.ORCID iD: 0000-0002-6473-7090
Umeå University, Sweden; PTB Physikalisch-Technische Bundesanstalt, Germany.
RISE - Research Institutes of Sweden, Bioeconomy, ETC Energy Technology Center.ORCID iD: 0000-0002-9395-9928
Show others and affiliations
2019 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029Article in journal (Refereed) Epub ahead of print
Abstract [en]

Combustion facilities run on pulverized biomass often exhibit fluctuations in fuel feeding and, thus, equivalence ratio and would benefit from fast process control based on optical λ sensors installed in the reactor core. The conversion of softwood powder is investigated in an atmospheric entrained-flow reactor (EFR) operated close to stoichiometry using two different burners (swirl and jet) and three oxygen concentrations (21, 30, and 40%). Tunable diode laser absorption spectroscopy (TDLAS) is used to conduct time-resolved (0.1-1 s) in situ measurements of the gas temperature, carbon monoxide (CO), water vapor (H2O), gaseous atomic potassium [K(g)], and soot volume fraction in the lower part of the reactor core and in the exhaust of the EFR. At both locations, the measurement parameters show significant, correlating fluctuations. The local equivalence ratio is derived from a comparison of measured CO and H2O concentrations (for fuel-rich and fuel-lean conditions, respectively) to thermodynamic equilibrium calculations (TEC) and found to vary in a wide range (0.8-1.3). Soot production decreases with an increasing local equivalence ratio and oxygen enrichment and is lower for the swirl compared to the jet burner. The measured K(g) concentrations follow the general behavior predicted by TEC around stoichiometry. In the relevant temperature range (1100-1700 K), K(g) is 2-4 orders of magnitude higher under fuel-rich than fuel-lean conditions, with a sharp transition at stoichiometry. While K(g) concentrations are lower than TEC in the reactor core and under fuel-rich conditions, excellent agreement is found at the exhaust after complete fuel conversion. Precise, wide dynamic range detection of K(g) using TDLAS enables discrimination between fuel-rich and fuel-lean conditions and has the potential for lambda sensing close to the hot reaction zone of combustion plants.

Place, publisher, year, edition, pages
American Chemical Society , 2019.
Keywords [en]
Absorption spectroscopy, Atmospheric movements, Carbon monoxide, Combustion, Laser diagnostics, Oxygen, Potassium compounds, Reactor cores, Semiconductor lasers, Soot, Stoichiometry, Thermoelectricity, Water absorption, Entrained flow reactors, Fuel-rich conditions, Local equivalence ratio, Measurement parameters, Oxygen concentrations, Soot volume fraction, Thermodynamic equilibrium calculation, Tunable diode laser absorption spectroscopy, Pulverized fuel
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-40631DOI: 10.1021/acs.energyfuels.9b02257Scopus ID: 2-s2.0-85073682107OAI: oai:DiVA.org:ri-40631DiVA, id: diva2:1369241
Note

 Funding details: Energimyndigheten; Funding details: Kempestiftelserna, Bio4Energy; Funding details: Swedish Insitute, SI; Funding text 1: This work has been performed within the platform for entrained-flow gasification (Bio4Gasification) in the Swedish Gasification Centre financed by the Swedish Energy Agency and the member companies. The authors acknowledge financial support from the Swedish Energy Agency, the Kempe Foundations, and the Swedish strategic research program Bio4Energy.

Available from: 2019-11-11 Created: 2019-11-11 Last updated: 2019-11-11Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records BETA

Sepman, AlexeyÖgren, YngveWiinikka, Henrik

Search in DiVA

By author/editor
Sepman, AlexeyÖgren, YngveWiinikka, Henrik
By organisation
ETC Energy Technology Center
In the same journal
Energy & Fuels
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 3 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
v. 2.35.8