- DCF-UFLA - Caixa Postal 3037
37200-000 - Lavras/MG - Brasil - 55 35 3829 1415
- Wood Anatomy, Bioenergy Systems, Wood science and technology, Biomass Pyrolysis, Wood chemistry, Sampling, and 15 moreEngenharia Florestal, Ciências florestais, Wood Technology, Wood Science, Drying Technology, Wood Charcoal, Wood anatomy and identification, Materials Technology (Wood Derivatives), Tecnologia de la Madera, Fiber/ Polymer Flammability, Wood Engineering, Pyrolysis, Thermal Decomposition, carbonization process, and Hidrothermal carbonization, biocharedit
- Graduated in Forest Engineering from Federal University of Viçosa (1984), master's degree (1987) and PhD (1995) in Fo... moreGraduated in Forest Engineering from Federal University of Viçosa (1984), master's degree (1987) and PhD (1995) in Forest Science from Federal University of Viçosa and postdoctoral degree in Forest Engineering from Federal University of Paraná (2005). Currently is a Full Professor at Federal University of Lavras in Lavras/MG. I have experience in Wood Science and Technology, Forest Resources and Forest Engineering, with emphasis on Biomass Energy, Wood Quality, Wood Physical and Chemical Properties, specifically working on issues related to Wood and Charcoal Quality, Pyrolysis and Thermal Degradation of Lignocellulosic Materials, Growth stress, Wood Sampling and Non-Destructive Evaluation Techniques.edit
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Research Interests: Biology and Eucalyptus
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<p>The aims of this work were to evaluate the correlation, to adjust and select simple and multiple linear statistical models between elemental components (carbon, hydrogen and oxygen) and ash content with higher heating... more
&lt;p&gt;The aims of this work were to evaluate the correlation, to adjust and select simple and multiple linear statistical models between elemental components (carbon, hydrogen and oxygen) and ash content with higher heating value for plant biomass; to use the principle components analysis for the creation of an energetic development index and to adjust a linear model between energetic development index and higher heating value. Eight types of biomass were used. Three linear and nine multiple statistical models were adjusted. The best models were selected based on the significance of coefficients, adjusted determination coefficient, estimative standard error, coefficient of variation, linearity of parameters, normality, presence of heterocedasticity and lack of error correlation. The variance inflation factor was determined for linear multiple models. High correlation between the variables studied was found. Models 1, 3 and 11 were considered most adequate. Practical use of model 2 is not possible. Principle components analysis was efficient in obtaining an energetic development index of lignocellulosic residues and it may be used for solving multicollinearity found between variables considered.&lt;/p&gt;&lt;p&gt;doi: 10.4336/2011.pfb.31.66.113&lt;/p&gt;<br>&lt;p&gt;Os objetivos do trabalho foram avaliar a correlação, ajustar e selecionar modelos estatísticos lineares simples e múltiplos entre os componentes elementares (carbono, hidrogênio e oxigênio) e o teor de cinzas com o poder calorífico superior da biomassa vegetal; utilizar a análise de componentes principais para a criação de um índice de desempenho energético e ajustar um modelo linear entre o índice de desempenho energético e o poder calorífico superior. Utilizaram-se oito tipos de biomassa. Foram ajustadas equações referentes a três modelos estatísticos lineares simples e nove múltiplos. Os melhores modelos foram selecionados com base na significância dos seus coeficientes, no coeficiente de determinação ajustado, no erro padrão da estimativa, no co [...]
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&lt;p&gt;This research aimed to evaluate briquettes made from coffee husk, eucalyptus sawdust and maize harvesting residues, and the influence of post compaction interval on some properties of the briquettes. After oven drying of... more
&lt;p&gt;This research aimed to evaluate briquettes made from coffee husk, eucalyptus sawdust and maize harvesting residues, and the influence of post compaction interval on some properties of the briquettes. After oven drying of the biomass, the briquettes were produced in a laboratory briquetting machine at 120 ºC and 15 MPa. Bulk density and heating value of the fresh biomass were analyzed. After compaction, influence of time on moisture content, volumetric expansion an bulk density of the briquettes was analyzed. From the results, it was observed that milled coffee husk had the highest mean value of bulk density. There was no statistical difference for higher heating value among the biomass analyzed. The effect of pos compaction interval was significant on moisture content based on dry mass and bulk density for all briquettes produced. The briquettes produced from maize harvesting residues had high volumetric expansion. Considering tensile strength by diametric compression, coffee husk briquettes were more resistant. The results highlight the potential of energetic use of briquettes obtained by compaction of coffee husks.&lt;/p&gt;&lt;p&gt;doi: 10.4336/2011.pfb.31.68.273&lt;/p&gt;<br>&lt;p&gt;O objetivo do presente trabalho foi avaliar briquetes produzidos a partir de casca de café, serragem de eucalipto e resíduos da colheita do milho, e a influência do tempo após a compactação em algumas propriedades dos briquetes. Após a biomassa ser previamente seca em estufa, os briquetes foram produzidos em uma briquetadeira laboratorial, à temperatura de 120±5ºC e pressão de 15 MPa. Determinaram-se a densidade a granel e o poder calorífico das biomassas in natura. Após a compactação, avaliou-se a influência do tempo sobre a umidade, a expansão volumétrica e a densidade aparente dos briquetes. A partir dos resultados obtidos, pode-se observar que a casca de café moída apresentou o maior valor médio para densidade a granel. Estatisticamente, as biomassas analisadas apresentaram o mesmo poder calorífico superior. O efeito [...]
Research Interests: Biofuel and Compaction
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Coffee has a prominent position in Brazilian economy, especially in southern Minas Gerais, the main producing state. Despite extensive research involving coffee plantations, there is a lack in literature concerning wood and charcoal from... more
Coffee has a prominent position in Brazilian economy, especially in southern Minas Gerais, the main producing state. Despite extensive research involving coffee plantations, there is a lack in literature concerning wood and charcoal from Coffea arabica. There are currently 5.6 billion coffee trees in a 2.3 million hectare area, generating residues, such as fruit bark and wood, which have potential as renewable fuels. Thus, the objective of this study was to evaluate the energetic potential of wood and charcoal from Coffea arabica in three cropping systems (organic, natural agroforestry and conventional) and two cultivars (Catuai and Mundo Novo), by elemental chemical analysis. Carbonizations were carried out in an electric oven (muffle) with a final temperature of 450°C. The bioenergy use of wood from Coffea arabica, as well as of the charcoal from this plant, proved satisfactory based on inferences made from the elemental chemical composition of these fuels. In general, cultivation systems and cultivars little influenced the levels of carbon, hydrogen, oxygen and sulfur of wood and charcoal, as well as the ratios N/C, H/C and O/C.
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Fibres and vessels represent the largest proportion of anatomical elements in hardwood tree species. They exert significant effects on various properties of the wood, which, consequently, have several implications for the use of the wood.... more
Fibres and vessels represent the largest proportion of anatomical elements in hardwood tree species. They exert significant effects on various properties of the wood, which, consequently, have several implications for the use of the wood. However, the effect of these elements on wood combustion behaviour is still poorly analysed in the literature. The present study aimed to evaluate the effect of fibre and vessel biometry on wood combustibility. The length, width and cell wall thickness of fibre, diameter of the lumen, and length and width of vessels were measured from five native Miombo tree species in Mozambique, namely Brachystegia boehmii Taub., Brachystegia spiciformis Benth., Julbernardia globiflora (Benth.) Troupin, Parinari curatellifolia Planch. ex Benth. and Uapaca kirkiana Müll. Arg. The fibre quality index and cell wall thickness were determined based on fibre biometry. The flexibility coefficient and the wall fraction are inversely proportional indices and individually affected most of the combustion parameters. Wood ignition is driven by large lumen diameter and flexibility in fibres. In addition, cell wall thickness and a larger wall fraction increase wood combustion.
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Resumo O melhoramento genético aplicado ao gênero Eucalyptus apresenta-se como opção potencial para o aumento da produção de madeira de qualidade. Conhecer a variabilidade contida ea forma de sua expressão é fundamental no processo de... more
Resumo O melhoramento genético aplicado ao gênero Eucalyptus apresenta-se como opção potencial para o aumento da produção de madeira de qualidade. Conhecer a variabilidade contida ea forma de sua expressão é fundamental no processo de seleção ...
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This research aimed to apply the near infrared spectroscopy technique (NIRS) for fast prediction of basic density and morphological characteristics of wood fibers in Eucalyptus clones. Six Eucalyptus clones aged three years were used,... more
This research aimed to apply the near infrared spectroscopy technique (NIRS) for fast prediction of basic density and morphological characteristics of wood fibers in Eucalyptus clones. Six Eucalyptus clones aged three years were used, obtained from plantations in Cocais, Guanhães ...
Research Interests: Mathematics, Forestry, Biology, Near Infrared, Near Infrared Spectroscopy, and 15 moreMinas Gerais, Cross Validation, Eucalyptus, Prediction Model, Forestry Sciences, Bois, Clone, Standard Error, Correlation coefficient, Specific Gravity, Densité, Basic Density, Cerne, Universidade Federal de Lavras, and Partial least square regression
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In general, the wood segment shows low competitively when compared to other economic segments, due to basic factors such low-tech machinery, excessive vertical production, low cooperation among companies, absent of design, and unqualified... more
In general, the wood segment shows low competitively when compared to other economic segments, due to basic factors such low-tech machinery, excessive vertical production, low cooperation among companies, absent of design, and unqualified labor. To acquire quality improvement of the products, labor, wood machines and other factors that would affect the production system, is very important a diagnostic. The main purpose of this study was to suggest an methodology to diagnostic the wood segment, using as principal tool the technological, social, and economic surveys. It was created a form emphasized items such as labor, machines, security and general layout. Based on these database is possible suggest adequate techniques for wood processing and product finishing.
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Abstract Lignocellulosic wastes from Amazonian crops are promising for the production of biochar. However, there are scientific gaps concerning the thermodegradation mechanisms of widely diverse biomass. This research explored the... more
Abstract Lignocellulosic wastes from Amazonian crops are promising for the production of biochar. However, there are scientific gaps concerning the thermodegradation mechanisms of widely diverse biomass. This research explored the relationships between the chemical compounds and the pyrolysis behavior of the açai seed, cocoa pod husk, coconut husk, palm empty fruit bunch, and maize cob by thermogravimetric analysis. The cocoa pod husk and palm empty fruit bunch showed the lowest temperatures of initial degradation (≤ 230 °C) because of the highest proportions of total extractives (≥ 17% dry basis) and ashes (≥ 5.7% dry basis) combined with the lowest contents of holocellulose (≤ 56% dry basis). Biomasses with higher extractives contents showed pronounced mass losses at temperatures ≤ 300 °C. The maize cob, with more holocellulose (68% dry basis), revealed a high maximum rate of thermal degradation of 7.9% min −1 and mass loss between 200 and 400 °C of 65.6% wet basis. The high level of acetone-soluble extractives raised the temperature necessary for the initial thermal degradation of açai seed. The coconut husk, açai seed, and cocoa pod husk were the most suitable wastes for the production of biochar based on the average mass yields (≥ 41% wet basis) at the pyrolysis final temperature of 400 °C. Graphic abstract
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O objetivo do trabalho foi avaliar o potencial energético das madeiras de espécies sob plano de manejo florestal provenientes da região do Seridó, no estado do Rio Grande do Norte. Utilizou-se na pesquisa, madeiras das espécies... more
O objetivo do trabalho foi avaliar o potencial energético das madeiras de espécies sob plano de manejo florestal provenientes da região do Seridó, no estado do Rio Grande do Norte. Utilizou-se na pesquisa, madeiras das espécies Jurema-preta, Pereiro, Marmeleiro, Catingueira, Mororó, Imburana, Jurema-branca e Mofumbo, aos 20 anos de idade, originadas da fazenda Dominga no município de Caicó/RN. Foram realizadas na madeira, as análises da densidade básica, teores de materiais voláteis, cinzas e carbono fixo, poder calorífico superior, composição química elementar e relações carbono/nitrogênio (C/N) e carbono/ hidrogênio (C/H). Adicionalmente, estimou-se a quantidade de energia produzida em kW.h.m-3 e em kW.h.ha-1 para todas as espécies. O experimento foi realizado segundo um delineamento inteiramente casualizado com oito tratamentos (espécies), quatro repetições (árvores-amostra), totalizando 32 unidades amostrais. Houve diferença significativa, a 5% de significância, entre os tratame...
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Research Interests: Biology and Eucalyptus
The objective of this study was to evaluate chemical and physical characteristics of the wood of commercial clones of Eucalyptus at different ages, correlate them to the Pilodyn® pin penetration, as well as their bioenergetic use. Two... more
The objective of this study was to evaluate chemical and physical characteristics of the wood of commercial clones of Eucalyptus at different ages, correlate them to the Pilodyn® pin penetration, as well as their bioenergetic use. Two commercial clones of Eucalyptus were sampled (I220 and I144), at two ages (49 and 61 months). The dendrometric characteristics of the trees were evaluated; in the wood basic density, chemical composition, higher and lower calorific values, energetic density and carbon stock were evaluated. Furthermore, the wood was subjected to thermogravimetry in inert atmosphere. A completely randomized design (CRD) was used, arranged in a double factorial design 2 x 2 with 4 replicates, besides an analysis of simple linear correlation between the Pilodyn® pin penetration and the characteristics analyzed. Clone I144 showed lower values for basic density, energetic density and carbon stock in wood than clone I220. However, clone I144 stood out in growth characteristic...
Research Interests: Biology and Eucalyptus
The physical-mechanical characteristics of Eucalyptus wood must be studied to promote its improvement and better utilisation. In order to become Eucalyptus urophylla a growing market alternative for flooring, beyond this characterization,... more
The physical-mechanical characteristics of Eucalyptus wood must be studied to promote its improvement and better utilisation. In order to become Eucalyptus urophylla a growing market alternative for flooring, beyond this characterization, it is important to assess the behaviour of this wood in conditions that simulate its use in service. So, the objective of this work was to evaluate the performance of wood of seven Eucalyptus urophylla clones in use for flooring. The tests of application of rolling load, coefficient of friction, surface indentation from small area loads and impact of the falling ball were carried out to simulate the behaviour of finish flooring in service, all based on ASTM D 2394. The results showed that significant statistical difference occurred between clones and between wood from central and peripheral regions of the stem both for the tests that simulate the application of the floor in service, except for the test of the falling ball that did not present diffe...
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The objective of this study was to evaluate the quality of charcoal from Coffea arabica L., for bioenergy purposes, using three existing cultivation systems in the South of Minas Gerais (natural agroforestry, organic and conventional) and... more
The objective of this study was to evaluate the quality of charcoal from Coffea arabica L., for bioenergy purposes, using three existing cultivation systems in the South of Minas Gerais (natural agroforestry, organic and conventional) and two cultivars (Mundo Novo and Catuai). Univariate and multivariate statistical techniques were used, besides the identification of mineral components for the selection and evaluation of the quality from coffee charcoal. The following properties were quantified in charcoal: apparent relative density, actual relative density, immediate chemical composition (volatiles, ash and fixed carbon), fixed carbon stock, energy densities, porosity, heating values; besides carbonization yields. The charcoal of the cultivar Catuai, with organic and conventional systems, stood out for steel and energy use, mainly by the higher values of apparent relative density, energy densities, fixed carbon stock and yields in charcoal and in fixed carbon. The effect of cultiva...
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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... more
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.