Effect of Natural Drying Methods on Moisture Content and Mass Change of Scots Pine Roundwood

Tomczak, Karol; Tomczak, Arkadiusz; Jelonek, Tomasz

doi:10.3390/f11060668

Cited by 25 publications

(25 citation statements)

References 30 publications

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“…Therefore, managing moisture content is a key way to improve the net calorific value and cost-efficiency of the energy wood supply [17]. Fortunately, natural drying of raw material in terms of transpirational drying of full-trees [18,19], seasoning of logging residues [20][21][22], energy roundwood [23][24][25][26][27][28], and firewood [29] proved to be an effective measure for reducing the moisture content. Reduction of moisture content is also possible while storing wood chips, either naturally [26,[30][31][32] or artificially [12,[33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Variability of Normative Properties of Wood Chips and Implications to Quality Control

et al. 2021

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The research was conducted with the goal to determine the variability of the quality parameters of the wood chips produced from the most favorable raw material (energy roundwood), and in the most controllable operational conditions (pellet factory), as the first step in identifying opportunities to optimize the wood chips’ quality monitoring. Four raw material types were tested: fir/spruce and beech debarked energy roundwood, as well as energy wood with bark of the same species. Sampling was conducted during six consecutive months along with laboratory testing, all according to the HRN EN ISO standards for solid biofuels. Interpretation of the results was done in relation to deviation from the first sampling results (as an indicator of the possibility to retain the quality of wood chips), and repeatability and reproducibility set in the standards (as an indicator of acceptable variability). The influence of the species and debarking process on the wood chips’ quality was analyzed as well. Relative deviation from the first sampling as well as the quality class change pointed moisture content as a normative property with the lowest possibility to retain initial values over the six-month period. Ash content results indicated a strong possibility to maintain the initial ash content class in the majority of the samples. In just three cases, the results of ash content were outside the reproducibility limits with first sampling as a reference. Gross calorific value results pointed only four samples outside the reproducibility limits with the first sampling results are set as a reference. Wood species influenced gross calorific value and the median value of the particle size distribution and debarking showed a significant positive effect on the moisture content reduction as well as on the ash content reduction. Presented findings are indicative for the investigated raw materials, however for the general conclusion on the subject of wood chips normative properties variation, various raw material types will have to be examined in further research.

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Section: Introductionmentioning

confidence: 99%

Variability of Normative Properties of Wood Chips and Implications to Quality Control

et al. 2021

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“…He emphasized the difference between formulations that need to be fed by experimental measurements or identified parameters and approaches that permit. Tomczak et al, [15] compared the most popular natural drying methods for stem wood of transpiration and air drying. For moisture content and mass all methods were comparable.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Drying Model of Water Vapor Pressure for Imbibed Porous Material with Sea Water subjected to Weather Conditions

Mohamed

2021

ARFMTS

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The drying model of porous material has been studied and solved. The drying model solves the drying of porous material if the porous material is saturated or unsaturated with salt solution. Local thermodynamic equilibrium was not assumed in the mathematical model for describing the multi-phase flow in the unsaturated porous media using the energy and mass conservation equations to describe the heat and mass transfer during the drying. The vapor pressure inside porous material voids is built from the vapor mass transport through material thickness and from the void’s water content evaporation. The new equation in the model is water vapor pressure’s equation. The drying model included advection and capillary transport of the water in porous material pores, the gases transport by advection and diffusion and soluble salt transports by diffusion only. The environment of the boundary condition of the model is atmospheric condition in the day’s hours. The model consists of 5 equations for mass and heat transfer phenomenon. The model was solved by Matlab software. The case study of the model is concrete block.

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“…Na secagem natural, não há o controle das variáveis, isso garante longos períodos para se atingir o teor de umidade adequado, em contrapartida, apresenta um baixo custo de instalação, por não necessitar de equipamentos sofisticados para a realização do processo (Simpson, 1983;Erber et al, 2015;Tomczak et al, 2020).…”

Section: Introductionunclassified

Secagem de toras de clones de Eucalyptus urograndis em estufa solar

Silva

Brito

Souza

et al. 2021

J. Biotechnol. Biodivers.

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A secagem é uma etapa importante no processo da industrialização da madeira, tendo como finalidade melhorar a qualidade do material. Porém, é um processo oneroso havendo a necessidade da redução dos seus custos, por meio de métodos que demandem menos investimento. Desse modo, os objetivos deste estudo foram avaliar a eficiência de estufa solar na secagem de toras de clones de Eucalyptus urograndis instalada no município de Macaíba, estado do Rio Grande do Norte, com o intuito de verificar se a região é adequada para esta prática; e ii) avaliar a influência de diferentes classes de diâmetro das toras no processo de secagem. Foram seccionadas toras de 1,50m e separadas em função de quatro classes de diamétricas. Em seguida foram pesadas e acondicionadas em estufa solar, sendo realizado medições diárias da temperatura e umidade relativa do ar e pesagens quinzenais durante o período de observação até que atingissem o ponto de saturação das fibras. Os dados foram submetidos a análise de regressão, aplicando-se o procedimento de seleção de variáveis. Aos 35 dias, todas as toras já haviam atingido o PSF. Entretanto, as medidas do diâmetro não afetaram significativamente na secagem, que se demonstrou eficiente quando comparada aos métodos convencionais e naturais. Portanto a secagem de toras em estufa solar torna-se um método viável para região.

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Effect of Natural Drying Methods on Moisture Content and Mass Change of Scots Pine Roundwood

Cited by 25 publications

References 30 publications

Variability of Normative Properties of Wood Chips and Implications to Quality Control

Variability of Normative Properties of Wood Chips and Implications to Quality Control

Theoretical Drying Model of Water Vapor Pressure for Imbibed Porous Material with Sea Water subjected to Weather Conditions

Secagem de toras de clones de Eucalyptus urograndis em estufa solar

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