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Particle formation ...
Particle formation during pressurized entrained flow gasification of wood powder : Effects of process conditions on chemical composition, nanostructure, and reactivity
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- Winikka, Henrik (författare)
- Luleå tekniska universitet,RISE,ETC Energy Technology Center,Luleå University of Technology, Sweden,Energivetenskap,RISE Energy Technology Center AB
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- Toth, Pal (författare)
- RISE,ETC Energy Technology Center,University of Miskolc, Hungary,RISE Energy Technology Center AB
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- Jansson, Kjell (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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- Molinder, Roger (författare)
- RISE,ETC Energy Technology Center,RISE Energy Technology Center
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- Broström, Markus (författare)
- Umeå universitet,Institutionen för tillämpad fysik och elektronik,Thermochemical Energy Conversion Laboratory (TEC-Lab), Department of Applied Physics and Electronics, Umeå University,Umeå University, Sweden
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- Sandström, Linda (författare)
- RISE,ETC Energy Technology Center,RISE Energy Technology Center AB
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- Lighty, JoAnn S. (författare)
- University of Utah, USA
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- Weiland, Fredrik (författare)
- RISE,ETC Energy Technology Center,RISE Energy Technology Center
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- Lighty, Jo Ann S. (författare)
- Department of Chemical Engineering, University of Utah, Salt Lake City, UT
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(creator_code:org_t)
- Elsevier BV, 2018
- 2018
- Engelska.
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Ingår i: Combustion and Flame. - : Elsevier BV. - 0010-2180 .- 1556-2921. ; 189, s. 1339-1351
- Relaterad länk:
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The influence of operating condition on particle formation during pressurized, oxygen blown gasification of wood powder with an ash content of 0.4 wt% was investigated. The investigation was performed with a pilot scale gasifier operated at 7 bar(a). Two loads, 400 and 600 kW were tested, with the oxygen equivalence ratio (λ) varied between 0.25 and 0.50. Particle concentration and mass size distribution was analyzed with a low pressure cascade impactor and the collected particles were characterized for morphology, elemental composition, nanostructure, and reactivity using scanning electron microscopy/high resolution transmission electron microscopy/energy dispersive spectroscopy, and thermogravimetric analysis. In order to quantify the nanostructure of the particles and identify prevalent sub-structures, a novel image analysis framework was used. It was found that the process temperature, affected both by λ and the load of the gasifier, had a significant influence on the particle formation processes. At low temperature (1060 °C), the formed soot particles seemed to be resistant to the oxidation process; however, when the oxidation process started at 1119 °C, the internal burning of the more reactive particle core began. A further increase in temperature (> 1313 °C) lead to the oxidation of the less reactive particle shell. When the shell finally collapsed due to severe oxidation, the original soot particle shape and nanostructure also disappeared and the resulting particle could not be considered as a soot anymore. Instead, the particle shape and nanostructure at the highest temperatures (> 1430 °C) were a function of the inorganic content and of the inorganic elements the individual particle consisted of. All of these effects together lead to the soot particles in the real gasifier environment having less and less ordered nanostructure and higher and higher reactivity as the temperature increased; i.e., they followed the opposite trend of what is observed during laboratory-scale studies with fuels not containing any ash-forming elements and where the temperature was not controlled by λ.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Energiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Energy Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Naturresursteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Annan teknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Other Engineering and Technologies (hsv//eng)
Nyckelord
- Biomass
- Gasification
- HRTEM
- Nanostructure
- Soot
- Dust
- Electron microscopy
- High resolution transmission electron microscopy
- Internal oxidation
- Meteorological instruments
- Nanostructures
- Oxidation
- Oxidation resistance
- Scanning electron microscopy
- Temperature
- Thermogravimetric analysis
- Transmission electron microscopy
- Elemental compositions
- Mass size distribution
- Ordered nanostructures
- Particle concentrations
- Particle formation process
- Pressurized entrained flow gasification
- Reactive particle shells
- Particle size analysis
- fuel
- inorganic compound
- nanomaterial
- oxygen
- Article
- ash
- chemical composition
- chemical structure
- combustion
- crystallization
- gas flow
- heat loss
- high temperature
- image analysis
- partial pressure
- particle size
- particulate matter
- powder
- priority journal
- solid
- thermal analysis
- thermodynamics
- thermostability
- wood
- Energiteknik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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