Modelling and practical operation results of a dryer for wood chips

Jukka Yrjölä, Jaakko Saastamoinen

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

A model of drying of fixed and moving bed in cross-flow is presented. A single particle model described as a multiple moving boundary problem applicable for an icy wood particle is proposed. The simultaneous drying and melting are described by shrinking cores and the effect of thermal storage is taken into account approximately. The results with both the single particle and the bed model compare favourably with the reported laboratory measurements. The drying of a deep fixed bed is a two-stage process. A constant rate of drying period with saturated outlet air at constant temperature is followed by a decreasing rate of drying with increasing air outlet temperature and decreasing degree of saturation. The bed modelling is performed to support the development work of a boiler plant using a dryer. Practical operation of dryers within the boiler plants is discussed.
Original languageEnglish
Pages (from-to)1077-1099
JournalDrying Technology
Volume20
Issue number6
DOIs
Publication statusPublished - 2002
MoE publication typeA1 Journal article-refereed

Fingerprint

drying apparatus
Driers (materials)
drying
Wood
Drying
chips
beds
boilers
outlets
Boilers
cross flow
air
Air
Melting
melting
saturation
Temperature
temperature

Keywords

  • biomass
  • biofuels
  • wood fuelas
  • wood chips
  • drying
  • dryers
  • modelling

Cite this

Yrjölä, Jukka ; Saastamoinen, Jaakko. / Modelling and practical operation results of a dryer for wood chips. In: Drying Technology. 2002 ; Vol. 20, No. 6. pp. 1077-1099.
@article{de9e3cbb4dd64dd79f60c9f59ea6a728,
title = "Modelling and practical operation results of a dryer for wood chips",
abstract = "A model of drying of fixed and moving bed in cross-flow is presented. A single particle model described as a multiple moving boundary problem applicable for an icy wood particle is proposed. The simultaneous drying and melting are described by shrinking cores and the effect of thermal storage is taken into account approximately. The results with both the single particle and the bed model compare favourably with the reported laboratory measurements. The drying of a deep fixed bed is a two-stage process. A constant rate of drying period with saturated outlet air at constant temperature is followed by a decreasing rate of drying with increasing air outlet temperature and decreasing degree of saturation. The bed modelling is performed to support the development work of a boiler plant using a dryer. Practical operation of dryers within the boiler plants is discussed.",
keywords = "biomass, biofuels, wood fuelas, wood chips, drying, dryers, modelling",
author = "Jukka Yrj{\"o}l{\"a} and Jaakko Saastamoinen",
note = "Project code: N0SU00276",
year = "2002",
doi = "10.1081/DRT-120004041",
language = "English",
volume = "20",
pages = "1077--1099",
journal = "Drying Technology",
issn = "0737-3937",
publisher = "Marcel Dekker Inc.",
number = "6",

}

Modelling and practical operation results of a dryer for wood chips. / Yrjölä, Jukka; Saastamoinen, Jaakko.

In: Drying Technology, Vol. 20, No. 6, 2002, p. 1077-1099.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Modelling and practical operation results of a dryer for wood chips

AU - Yrjölä, Jukka

AU - Saastamoinen, Jaakko

N1 - Project code: N0SU00276

PY - 2002

Y1 - 2002

N2 - A model of drying of fixed and moving bed in cross-flow is presented. A single particle model described as a multiple moving boundary problem applicable for an icy wood particle is proposed. The simultaneous drying and melting are described by shrinking cores and the effect of thermal storage is taken into account approximately. The results with both the single particle and the bed model compare favourably with the reported laboratory measurements. The drying of a deep fixed bed is a two-stage process. A constant rate of drying period with saturated outlet air at constant temperature is followed by a decreasing rate of drying with increasing air outlet temperature and decreasing degree of saturation. The bed modelling is performed to support the development work of a boiler plant using a dryer. Practical operation of dryers within the boiler plants is discussed.

AB - A model of drying of fixed and moving bed in cross-flow is presented. A single particle model described as a multiple moving boundary problem applicable for an icy wood particle is proposed. The simultaneous drying and melting are described by shrinking cores and the effect of thermal storage is taken into account approximately. The results with both the single particle and the bed model compare favourably with the reported laboratory measurements. The drying of a deep fixed bed is a two-stage process. A constant rate of drying period with saturated outlet air at constant temperature is followed by a decreasing rate of drying with increasing air outlet temperature and decreasing degree of saturation. The bed modelling is performed to support the development work of a boiler plant using a dryer. Practical operation of dryers within the boiler plants is discussed.

KW - biomass

KW - biofuels

KW - wood fuelas

KW - wood chips

KW - drying

KW - dryers

KW - modelling

U2 - 10.1081/DRT-120004041

DO - 10.1081/DRT-120004041

M3 - Article

VL - 20

SP - 1077

EP - 1099

JO - Drying Technology

JF - Drying Technology

SN - 0737-3937

IS - 6

ER -