Air drying of logs from an Eucalyptus urophylla clone for carbonization use

Rezende, Raphael Nogueira; Lima, José Tarcísio; Silva, José Reinaldo Moreira da; Napoli, Alfredo; Andrade, H. B.; Faria, André Luiz Raimundo

doi:10.1590/s0104-77602010000400016

Cited by 18 publications

(27 citation statements)

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“…Environmental factors such as relative humidity, temperature, and wind speed as well as wood factors such as anatomy, density, and diameter of the logs affect the drying process (Larsen and Ormarsson 2013, Mugabi et al 2010, Rémond et al 2013, Rezende et al 2010.…”

Section: Introductionmentioning

confidence: 99%

Predicting moisture content from basic density and diameter during air drying of Eucalyptus and corymbia logs

Zanuncio

Carvalho

Silva

et al. 2015

Maderas, Cienc. tecnol.

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In air drying of Eucalyptus urophylla and Corymbia citriodora logs for the production of charcoal it is necessary to be able to predict when logs have reached the required moisture content of ≤ 35%. This study is aimed to produce models using basic density and diameter to predict the moisture content of Eucalyptus urophylla and Corymbia citriodora logs after 30, 60 and 90 days drying. 1,2 m long logs were taken at three different heights from three C. citriodora trees and three trees each from two E. urophylla clones (VM4 and Mn463). The 27 debarked, end sealed logs were air dried under cover for 90 days during which the change in moisture content was monitored. The relationship between density and drying was analyzed by Pearson's correlation coefficient and the models for predicting the moisture content based on the basic density and diameter were produced. The density and the drying showed a high correlation coefficient. The coefficient of determination of the models was above 0,89 with a standard error lower than 6%. The use of the density and diameter to estimate the wood moisture content simplifies the production of the models, which can be used for Eucalyptus and Corymbia genetic materials.

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Section: Introductionmentioning

confidence: 99%

Predicting moisture content from basic density and diameter during air drying of Eucalyptus and corymbia logs

Zanuncio

Carvalho

Silva

et al. 2015

Maderas, Cienc. tecnol.

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“…During this period, the wood has high quantity of free water, requiring low energy expenditure for its removal and resulting in high loss of moisture per unit of time (ANANIAS et al, 2013;ENGELUND et al, 2013). This trend was also reported for Eucalyptus urophylla logs (REZENDE et al, 2010), Betula papyrifera fl akes (BEDANE et al, 2011) and Eucalyptus cloeziana, Eucalyptus pellita (REDMAN et al, 2010) and Paulownia fortune (TARIA et al, 2015) lumber.…”

Section: Resultsmentioning

confidence: 64%

“…This occurred because the distance traveled by the water inside the wood is shorter, reaching the surface quickly and, thus, increasing drying rate (REZENDE et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

“…The model [3], based in the log drying behavior (REZENDE et al, 2010;ZANUNCIO et al, 2013), was used to estimate moisture, fuel consumption and the number of trips as a function of days of drying (Equation 3). Where: Y= moisture (%) or fuel consumption per ton of wood transported (L .…”

Section: Methodsmentioning

confidence: 99%

“…The drying rate over time is heterogeneous due to different relations between water and wood (REZENDE et al, 2010;KORKUT et al, 2013), which complicates its control. The water in the vessel elements, lumen and others void spaces are connected to the wood by weak capillary connections, forming the free water (SKAAR, 1988).…”

Section: Introductionmentioning

confidence: 99%

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Importance of Wood Drying to the Forest Transport and Pulp Mill Supply

Zanuncio

Carvalho

Silva

et al. 2017

CERNE

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ABSTRACT:The forest transportation represents a great proportion of raw material cost for pulp and paper production and, for this reason, the wood moisture content should be low to reduce these cost. The objective was to relate the wood moisture with fuel consumption per kilometer in each vehicle and the number of trips to supply a pulp mill. Three trees of Eucalyptus urophylla clone and three of Corymbia citriodora from seeds were used. These trees were felled and their logs removed from its base and at 50 and 100% of the commercial height. The basic density and initial moisture of wood were determined and the air drying monitored during 90 days. The fuel consumption to transport one ton of dry wood and the number of trips required to supply a pulp mill were estimated based on the number of air drying days. Air drying reduced the fuel consumption and the number of trips to supply the pulp mill. The accuracy of models to estimate the wood moisture, fuel consumption and the number of trips based in days of drying was high. Therefore, wood drying is an essential tool to reduce forest transport costs. IMPORTÂNCIA DA SECAGEM DA MADEIRA PARA O TRANSPORTE FORESTAL E ABASTECIMENTO DE FÁBRICAS DE POLPA CELULÓSICARESUMO: O transporte florestal representa uma grande proporção do custo da matéria-prima para a produção de papel e celulose, por esse motivo, o teor de umidade da madeira deve ser baixo para reduzir esses custos. O objetivo deste trabalho foi relacionar a umidade da madeira com o consumo de combustível por quilômetro em cada veículo e o número de viagens necessárias para abastecer uma fábrica de celulose. Três árvores de um clone de Eucalyptus urophylla e de Corymbia citriodora com produção seminal foram utilizadas. As árvores foram abatidas e seus troncos foram removidos de sua base e 50% e 100% da altura comercial. A densidade básica e a umidade inicial da madeira foram determinadas e a secagem ao ar foi monitorada durante 90 dias. O consumo de combustível para transportar uma tonelada de madeira seca e o número de viagens necessárias para abastecer uma fábrica de celulose foram estimados com base no número de dias de secagem. A secagem ao ar livre reduziu o consumo de combustível e o número de viagens para abastecer a fábrica de celulose. A precisão dos modelos para estimar a umidade da madeira, o consumo de combustível e o número de viagens com base nos dias de secagem apresentaram alta precisão. Portanto, a secagem de madeira é uma ferramenta essencial para reduzir os custos do transporte florestal.

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