A comparative study in 3D of bed particle layer characteristics in quartz and K-feldspar from fluidized bed combustion of woody biomass using X-ray microtomography

Valizadeh, AliLuleå tekniska universitet,Energivetenskap,Division of Energy Engineering, Luleå University of Technology, Luleå, Sweden (author)

Godkänd;2023;Nivå 0;2023-03-08 (joosat);Konferensartikel i tidskriftPart of special issue: 28th International Conference on the Impact of Fuel Quality on Power Production and the Environment, Edited by Flemming J. Frandsen, Stanley Harding, Terry Wall, Markus Broström, Maria ZevenhovenLicens fulltext: CC BY License
Bed particle layer and crack layer characteristics at different ages were studied for quartz and K-feldspar bed particles from a 30 MWth bubbling fluidized bed and a 90 MWth circulating fluidized bed, both using woody biomass as fuel. X-ray microtomography (XMT) was utilized to determine the bed particle layer distribution on the bed particles' surface. For each bed particle type, the average bed particle layer thickness as well as average volume fractions of the bed particle layer and crack layers to the entire bed particle volume were determined at three different bed particle ages by utilizing XMT analysis. Comparison of the two different bed particle types showed that K-feldspar retains a thinner bed particle layer in both conversion processes compared to quartz. Crack layers were observed extensively in quartz bed particles to the extent of 19.3 vol% and 32.1 vol% after 13 days in the BFB and the CFB, respectively, which could cause deposition of the bed particle fragments. On the contrary, K-feldspar has almost no tendency toward forming crack layers.

Skoglund, NilsUmeå universitet,Institutionen för tillämpad fysik och elektronik,Thermochemical Energy Conversion Laboratory, Department of Applied Physics and Electronics, Umeå University, SE-90187 Umeå, Sweden(Swepub:umu)nisskd01 (author)
Forsberg, FredrikLuleå tekniska universitet,Strömningslära och experimentell mekanik,Division of Fluid and Experimental Mechanics, Luleå University of Technology, Luleå, Sweden(Swepub:ltu)fred (author)
Lycksam, HenrikLuleå tekniska universitet,Strömningslära och experimentell mekanik,Division of Fluid and Experimental Mechanics, Luleå University of Technology, Luleå, Sweden(Swepub:ltu)henlyc (author)
Öhman, Marcus,1969-Luleå tekniska universitet,Energivetenskap,Division of Energy Engineering, Luleå University of Technology, Luleå, Sweden(Swepub:ltu)ohmmar (author)
Luleå tekniska universitetEnergivetenskap (creator_code:org_t)

By the author/editor: Valizadeh, Ali; Skoglund, Nils; Forsberg, Fredri ...; Lycksam, Henrik; Öhman, Marcus, 1 ...

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