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Temporal temperature measurement on burning biomass pellets using phosphor thermometry and two-line atomic fluorescence

Weng, Wubin LU ; Feuk, Henrik LU ; Li, Shen LU ; Richter, Mattias LU ; Aldeń, Marcus LU and Li, Zhongshan LU (2021) In Proceedings of the Combustion Institute 38(3). p.3929-3938
Abstract

We report accurate in-situ optical measurements of surface temperature, volatile gas temperature, and polycyclic aromatic hydrocarbon (PAH) emission over the whole burning history of individual biomass pellets in various combustion atmospheres. Two biomass fuels, wood and straw, were prepared in cylindrical pellets of ~300 mg. The pellets were burned in a well-controlled combustion atmosphere provided by a laminar flame burner with temperature ranging from 1390 K to 1840 K, and oxygen concentration from zero to 4.5%. The surface temperature of burning biomass pellets was accurately measured, for the first time, using phosphor thermometry, and the volatile gas temperature was measured using two-line atomic fluorescence thermometry. PAH... (More)

We report accurate in-situ optical measurements of surface temperature, volatile gas temperature, and polycyclic aromatic hydrocarbon (PAH) emission over the whole burning history of individual biomass pellets in various combustion atmospheres. Two biomass fuels, wood and straw, were prepared in cylindrical pellets of ~300 mg. The pellets were burned in a well-controlled combustion atmosphere provided by a laminar flame burner with temperature ranging from 1390 K to 1840 K, and oxygen concentration from zero to 4.5%. The surface temperature of burning biomass pellets was accurately measured, for the first time, using phosphor thermometry, and the volatile gas temperature was measured using two-line atomic fluorescence thermometry. PAH emission was monitored using two-dimensional laser-induced fluorescence. During the devolatilization stage, a relatively low surface temperature, ~700 K, was observed on the burning pellets. The volatile gas temperature was ~1100 K and ~1500 K 5 mm above the top of the pellets in a gas environment of ~1800 K with 0.5% and 4.5% oxygen, respectively. PAH mainly released when the temperature of the pellet exceeded ~600 K with the highest concentration close to the surface and being consumed downstream. The weight of the released PAH molecules shifted towards lighter with a reduction of gas environment temperature. The wood and straw pellets had almost the same surface and volatile gas temperature but different compositions in the released volatile gases. The temperature information provided in the present work aids in revealing the reactions in the burning biomass fuels regarding species release, such as various hydrocarbons, nitrogen compounds, and potassium species, and is valuable for further development of biomass thermal conversion models.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Biomass combustion, PAH laser-induced fluorescence, Phosphor thermometry, Temperature, Two-line atomic fluorescence
in
Proceedings of the Combustion Institute
volume
38
issue
3
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:85089510533
ISSN
1540-7489
DOI
10.1016/j.proci.2020.06.095
language
English
LU publication?
yes
id
5e7e0556-7645-4f13-b3b1-6a0829df7a72
date added to LUP
2020-08-28 10:41:26
date last changed
2022-04-19 00:23:40
@article{5e7e0556-7645-4f13-b3b1-6a0829df7a72,
  abstract     = {{<p>We report accurate in-situ optical measurements of surface temperature, volatile gas temperature, and polycyclic aromatic hydrocarbon (PAH) emission over the whole burning history of individual biomass pellets in various combustion atmospheres. Two biomass fuels, wood and straw, were prepared in cylindrical pellets of ~300 mg. The pellets were burned in a well-controlled combustion atmosphere provided by a laminar flame burner with temperature ranging from 1390 K to 1840 K, and oxygen concentration from zero to 4.5%. The surface temperature of burning biomass pellets was accurately measured, for the first time, using phosphor thermometry, and the volatile gas temperature was measured using two-line atomic fluorescence thermometry. PAH emission was monitored using two-dimensional laser-induced fluorescence. During the devolatilization stage, a relatively low surface temperature, ~700 K, was observed on the burning pellets. The volatile gas temperature was ~1100 K and ~1500 K 5 mm above the top of the pellets in a gas environment of ~1800 K with 0.5% and 4.5% oxygen, respectively. PAH mainly released when the temperature of the pellet exceeded ~600 K with the highest concentration close to the surface and being consumed downstream. The weight of the released PAH molecules shifted towards lighter with a reduction of gas environment temperature. The wood and straw pellets had almost the same surface and volatile gas temperature but different compositions in the released volatile gases. The temperature information provided in the present work aids in revealing the reactions in the burning biomass fuels regarding species release, such as various hydrocarbons, nitrogen compounds, and potassium species, and is valuable for further development of biomass thermal conversion models.</p>}},
  author       = {{Weng, Wubin and Feuk, Henrik and Li, Shen and Richter, Mattias and Aldeń, Marcus and Li, Zhongshan}},
  issn         = {{1540-7489}},
  keywords     = {{Biomass combustion; PAH laser-induced fluorescence; Phosphor thermometry; Temperature; Two-line atomic fluorescence}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{3929--3938}},
  publisher    = {{Elsevier}},
  series       = {{Proceedings of the Combustion Institute}},
  title        = {{Temporal temperature measurement on burning biomass pellets using phosphor thermometry and two-line atomic fluorescence}},
  url          = {{http://dx.doi.org/10.1016/j.proci.2020.06.095}},
  doi          = {{10.1016/j.proci.2020.06.095}},
  volume       = {{38}},
  year         = {{2021}},
}