Potassium release from biomass particles during combustion—real-time in situ tdlas detection and numerical simulation
(2021) In Applied Sciences (Switzerland) 11(19).- Abstract
Potassium (K) is one of the main and most hazardous trace species released to the gas-phase during thermochemical conversion of biomass. Accurate experimental data and models of K release are needed to better understand the chemistry involved. Tunable diode laser absorption spectroscopy (TDLAS) is used for simultaneous real-time in situ measurements of gas-phase atomic K, water (H2O) and gas temperature in the vicinity (boundary layer) of biomass particles during combustion in a laboratory single-particle reactor. Atomic K is detected in a wide dynamic range, including optically thick conditions, using direct absorption spectroscopy at the wavelength of 770 nm, while H2O and temperature are determined by calibration-free scanned... (More)
Potassium (K) is one of the main and most hazardous trace species released to the gas-phase during thermochemical conversion of biomass. Accurate experimental data and models of K release are needed to better understand the chemistry involved. Tunable diode laser absorption spectroscopy (TDLAS) is used for simultaneous real-time in situ measurements of gas-phase atomic K, water (H2O) and gas temperature in the vicinity (boundary layer) of biomass particles during combustion in a laboratory single-particle reactor. Atomic K is detected in a wide dynamic range, including optically thick conditions, using direct absorption spectroscopy at the wavelength of 770 nm, while H2O and temperature are determined by calibration-free scanned wavelength modulation spectroscopy at 1398 nm. The high accuracy and repeatability of the setup allows to distinguish measurements with varying initial particle mass, laser beam height above the particle and fuel type. Four types of biomass with different ash composition are investigated: softwood, Salix, Miscanthus and wheat straw. For Salix and wheat straw, the K release behaviour is, for the first time, compared to a detailed numerical particle model taking into account the interaction between K/S/Cl composition in the particle ash. A good agreement is achieved between the measured and calculated time-resolved atomic K concentrations for the devolatilization phase of the biomass particles.
(Less)
- author
- Qu, Zhechao ; Fatehi, Hesameddin LU and Schmidt, Florian M.
- organization
- publishing date
- 2021-10-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Biomass, Combustion, Laser spectroscopy, Numerical particle model, Potassium (K), TDLAS
- in
- Applied Sciences (Switzerland)
- volume
- 11
- issue
- 19
- article number
- 8887
- publisher
- MDPI AG
- external identifiers
-
- scopus:85115743471
- ISSN
- 2076-3417
- DOI
- 10.3390/app11198887
- language
- English
- LU publication?
- yes
- id
- 351c1014-c4df-4e35-b132-8019855ac828
- date added to LUP
- 2021-10-08 13:46:04
- date last changed
- 2022-04-27 04:32:15
@article{351c1014-c4df-4e35-b132-8019855ac828,
abstract = {{<p>Potassium (K) is one of the main and most hazardous trace species released to the gas-phase during thermochemical conversion of biomass. Accurate experimental data and models of K release are needed to better understand the chemistry involved. Tunable diode laser absorption spectroscopy (TDLAS) is used for simultaneous real-time in situ measurements of gas-phase atomic K, water (H2O) and gas temperature in the vicinity (boundary layer) of biomass particles during combustion in a laboratory single-particle reactor. Atomic K is detected in a wide dynamic range, including optically thick conditions, using direct absorption spectroscopy at the wavelength of 770 nm, while H2O and temperature are determined by calibration-free scanned wavelength modulation spectroscopy at 1398 nm. The high accuracy and repeatability of the setup allows to distinguish measurements with varying initial particle mass, laser beam height above the particle and fuel type. Four types of biomass with different ash composition are investigated: softwood, Salix, Miscanthus and wheat straw. For Salix and wheat straw, the K release behaviour is, for the first time, compared to a detailed numerical particle model taking into account the interaction between K/S/Cl composition in the particle ash. A good agreement is achieved between the measured and calculated time-resolved atomic K concentrations for the devolatilization phase of the biomass particles.</p>}},
author = {{Qu, Zhechao and Fatehi, Hesameddin and Schmidt, Florian M.}},
issn = {{2076-3417}},
keywords = {{Biomass; Combustion; Laser spectroscopy; Numerical particle model; Potassium (K); TDLAS}},
language = {{eng}},
month = {{10}},
number = {{19}},
publisher = {{MDPI AG}},
series = {{Applied Sciences (Switzerland)}},
title = {{Potassium release from biomass particles during combustion—real-time in situ tdlas detection and numerical simulation}},
url = {{http://dx.doi.org/10.3390/app11198887}},
doi = {{10.3390/app11198887}},
volume = {{11}},
year = {{2021}},
}