AVALIAÇÃO DO TEOR DE UMIDADE DA MADEIRA DE Eucalyptus grandis POR MEDIDORES ELÉTRICOS RESISTIVOS

Wood drying is one of various stages in the carbonization process, therefore proper monitoring is key to improving yield and obtaining quality charcoal. Prior to being subjected to carbonization by charcoal production plants and once trees have been felled, logs are piled up by the roadside or close to carbonization furnaces and left air drying for 90 days until an optimal 30% moisture content is reached. This work aims to evaluate air drying of logs from an Eucalyptus urophylla clone for carbonization use, analyzing moisture reduction over time and also the influence of log diameter and bark. Logs with and without bark were used, 6.0cm to 21.0cm in diameter, 3.60m in length, with average basic density of 0.496 g/cm 3 , obtained from a commercial stand of Eucalyptus urophylla at age 8 years. Air drying log piles were arranged outdoors in Paraopeba, Minas Gerais State, Brazil and monitoring consisted of periodic log weighing for a period of 80 days. At the end of the experiment, higher rates of moisture loss were observed in the three initial weeks. Moisture in logs without bark (54%) and with bark (50%) was close after 80 drying days, with a higher level of moisture reduction being observed for logs without bark. Bark influence on moisture loss was more pronounced in the first three weeks. Moisture reduction varied in intensity as a function of log diameter. After 80 days, the highest level of moisture reduction was observed in logs without bark: 65% for logs larger in diameter and 80% for logs smaller in diameter. As regards logs with bark, results were 56% and 75% respectively.Key words: Charcoal, log piles, moisture content. SECAGEM AO AR LIVRE DE TORAS DE UM CLONE DE Eucalyptus urophylla EMPREGADO NA CARBONIZAÇÃO RESUMO: A secagem da madeira é uma das etapas do processo de carbonização e seu controle é de grande importância no rendimento e na qualidade do carvão vegetal produzido. Nas empresas produtoras de carvão, após o corte, a madeira é empilhada nas margens das estradas ou próxima aos fornos de carbonização e é carbonizada após 90 dias de secagem ao ar livre, quando se deseja alcançar 30% de umidade. Neste trabalho, objetivou-se avaliar a secagem ao ar livre de toras de um clone de Eucalyptus urophylla empregado na produção de carvão vegetal, analisando-se a perda de umidade no tempo, influência da casca e do diâmetro das toras no processo. Foram utilizadas toras com casca e sem casca, com diâmetros variando de

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

Rezende

Lima

Silva

et al. 2010

CERNE

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Instant Determination of Moisture and Bulk Density of Woodchips in Cellulose Industry

Kumov,

Cremonez

2023

RGSA

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Purpose: This research aims to achieve the instantaneous determination of moisture content and bulk density of wood chips for energy generation and pulp production in the pulp and paper industry. Theoretical framework: The moisture content and bulk density of woodchips influence the quality of biomass for energy generation and cellulose production in various ways. These variables affect the calorific value, mass and volume of logistical transport, the quantity of reagents in the reactor for wood delignification, among other factors. For this reason, a quick and accurate evaluation of these factors in the field is of fundamental importance to improve industrial quality and productivity. Method: To achieve this goal, a pilot test was conducted using a capacitive sensor and a portable scale to determine the moisture and bulk density of wood chips. Calibration equations were developed in the laboratory for the sensor, correlating the readings with the actual moisture content of seven types of wood chips, including Eucalyptus spp. and Pinus spp. The results of field measurements using these equations were compared with the gravimetric method, as well as bulk density measurements. Results and conclusion: The moisture calibration equations showed a high correlation between the capacitive sensor and the gravimetric method. The field density results were similar to those obtained in the laboratory. It was concluded that the investigated methods show promise for use in the pulp and paper industry. Research implications: The validation and accuracy of portable instruments for the instantaneous determination of moisture content and bulk density of wood chips are of utmost importance for manufacturers of portable meters and for industries that use this raw material. Originality/value: The instantaneous determination of moisture content and bulk density can contribute to improving the energy and production efficiency of boilers that generate heat for pulp digesters. Moreover, it optimizes logistical transportation and quality control against the attack of xylophagous organisms, preventing waste of raw materials, which is essential for sustainable development.

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AVALIAÇÃO DO TEOR DE UMIDADE DA MADEIRA DE Eucalyptus grandis POR MEDIDORES ELÉTRICOS RESISTIVOS

Cited by 2 publications

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

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

Instant Determination of Moisture and Bulk Density of Woodchips in Cellulose Industry

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