FLUIDIZATION BEHAVIOR OF WOOD/SAND MIXTURES

In conversion of biomass to secondary energy carriers, several routes are possible, such as gasification, combustion and pyrolysis. In many of these processes it is necessary or advantageous to dry the biomass before further processing. For wooden biomass, fluidized bed drying in superheated steam i...

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Autores principales:	Ramakers,Bram J, de Ridder,Ronny, Kerkhof,Piet J.A.M
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2004
Materias:	drying of wood fluidization binary mixture
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2004000200005
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spelling	oai:scielo:S0718-221X20040002000052019-05-30FLUIDIZATION BEHAVIOR OF WOOD/SAND MIXTURESRamakers,Bram Jde Ridder,RonnyKerkhof,Piet J.A.M drying of wood fluidization binary mixture In conversion of biomass to secondary energy carriers, several routes are possible, such as gasification, combustion and pyrolysis. In many of these processes it is necessary or advantageous to dry the biomass before further processing. For wooden biomass, fluidized bed drying in superheated steam is a promising option. Given the difficulty to fluidize wood particles alone, it is very common to fluidize these kinds of particles with sand. This also gives better defined fluidization behavior. Especially when the wood particles come in various size and shape (i.e. from sawdust to chopped wood), this gives a more reliable scale-up. Also heat transfer to the wood particles may benefit from the use of sand. However, not much is known about fluidization behavior in pressurized steam of binary mixtures with large particle size ratio and large particle density ratio. Therefore minimum fluidization velocity and bed porosity of wood/sand mixtures in air have been experimentally determined and compared to correlations known from literature. The experimental values show a clear trend, but correlations from literature appear not to be very accurate. So more experiments have to be done to find a correlation that gives more accurate predictions in case of the specific particles used in this work. From segregation experiments could be found that, to keep the wood/sand bed well-mixed, finer sand (0.1-0.5 mm) with maximum 10 weight-% wood should be used, and the superficial gas velocity should be at least 3-4 times the minimum fluidization velocityinfo:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.6 n.2 20042004-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2004000200005en10.4067/S0718-221X2004000200005
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	drying of wood fluidization binary mixture
spellingShingle	drying of wood fluidization binary mixture Ramakers,Bram J de Ridder,Ronny Kerkhof,Piet J.A.M FLUIDIZATION BEHAVIOR OF WOOD/SAND MIXTURES
description	In conversion of biomass to secondary energy carriers, several routes are possible, such as gasification, combustion and pyrolysis. In many of these processes it is necessary or advantageous to dry the biomass before further processing. For wooden biomass, fluidized bed drying in superheated steam is a promising option. Given the difficulty to fluidize wood particles alone, it is very common to fluidize these kinds of particles with sand. This also gives better defined fluidization behavior. Especially when the wood particles come in various size and shape (i.e. from sawdust to chopped wood), this gives a more reliable scale-up. Also heat transfer to the wood particles may benefit from the use of sand. However, not much is known about fluidization behavior in pressurized steam of binary mixtures with large particle size ratio and large particle density ratio. Therefore minimum fluidization velocity and bed porosity of wood/sand mixtures in air have been experimentally determined and compared to correlations known from literature. The experimental values show a clear trend, but correlations from literature appear not to be very accurate. So more experiments have to be done to find a correlation that gives more accurate predictions in case of the specific particles used in this work. From segregation experiments could be found that, to keep the wood/sand bed well-mixed, finer sand (0.1-0.5 mm) with maximum 10 weight-% wood should be used, and the superficial gas velocity should be at least 3-4 times the minimum fluidization velocity
author	Ramakers,Bram J de Ridder,Ronny Kerkhof,Piet J.A.M
author_facet	Ramakers,Bram J de Ridder,Ronny Kerkhof,Piet J.A.M
author_sort	Ramakers,Bram J
title	FLUIDIZATION BEHAVIOR OF WOOD/SAND MIXTURES
title_short	FLUIDIZATION BEHAVIOR OF WOOD/SAND MIXTURES
title_full	FLUIDIZATION BEHAVIOR OF WOOD/SAND MIXTURES
title_fullStr	FLUIDIZATION BEHAVIOR OF WOOD/SAND MIXTURES
title_full_unstemmed	FLUIDIZATION BEHAVIOR OF WOOD/SAND MIXTURES
title_sort	fluidization behavior of wood/sand mixtures
publisher	Universidad del Bío-Bío
publishDate	2004
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2004000200005
work_keys_str_mv	AT ramakersbramj fluidizationbehaviorofwoodsandmixtures AT deridderronny fluidizationbehaviorofwoodsandmixtures AT kerkhofpietjam fluidizationbehaviorofwoodsandmixtures
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FLUIDIZATION BEHAVIOR OF WOOD/SAND MIXTURES

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