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Träfflista för sökning "WFRF:(Molinder Anna) srt2:(2017)"

Sökning: WFRF:(Molinder Anna) > (2017)

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1.
  • Holmgren, Per, et al. (författare)
  • Size, shape, and density changes of biomass particles during rapid devolatilization
  • 2017
  • Ingår i: Fuel. - : Elsevier BV. - 0016-2361 .- 1873-7153. ; 206, s. 342-351
  • Tidskriftsartikel (refereegranskat)abstract
    • Particle properties such as size, shape and density play significant roles on particle flow and flame propagationin pulverized fuel combustion and gasification. A drop tube furnace allows for experiments athigh heating rates similar to those found in large-scale appliances, and was used in this study to carryout experiments on pulverized biomass devolatilization, i.e. detailing the first stage of fuel conversion.The objective of this study was to develop a particle conversion model based on optical informationon particle size and shape transformation. Pine stem wood and wheat straw were milled and sieved tothree narrow size ranges, rapidly heated in a drop tube setup, and solid residues were characterized usingoptical methods. Different shape descriptors were evaluated and a shape descriptor based on particleperimeter was found to give significant information for accurate estimation of particle volume. The opticalconversion model developed was proven useful and showed good agreement with conversion measuredusing a reference method based on chemical analysis of non-volatilized ash forming elements.The particle conversion model presented can be implemented as a non-intrusive method for in-situ monitoringof particle conversion, provided density data has been calibrated.
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2.
  • Strandberg, Anna, et al. (författare)
  • Effects of Pyrolysis Conditions and Ash Formation on Gasification Rates of Biomass Char
  • 2017
  • Ingår i: Energy & Fuels. - : American Chemical Society (ACS). - 0887-0624 .- 1520-5029. ; 31:6, s. 6507-6514
  • Tidskriftsartikel (refereegranskat)abstract
    • Pyrolysis conditions and the presence of ash-forming elements significantly influence char properties and its oxidation or gasification reactivity. In this study, intrinsic gasification rates of char from high heating rate pyrolysis were analyzed with isothermal thermogravimetry. The char particles were prepared from two biomasses at three size ranges and at two temperatures. Reactivity dependence on original particle size was found only for small wood particles that had higher intrinsic char gasification rates. Pyrolysis temperature had no significant effect on char reactivity within the range tested. Observations of ash formation highlighted that reactivity was influenced by the presence of ash-forming elements, not only at the active char sites but also through prohibition of contact between char and gasification agent by ash layer formation with properties highly depending on ash composition.
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  • Resultat 1-2 av 2
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refereegranskat (2)
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Broström, Markus (2)
Umeki, Kentaro (2)
Molinder, Roger (2)
Wiinikka, Henrik (2)
Holmgren, Per (2)
Strandberg, Anna (2)
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Wagner, David R. (2)
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