Thermal Parameters of Beech Wood Dust

Marková, Iveta; Ladomerský, Juraj; Hroncová, Emília; Mračková, Eva

doi:10.15376/biores.13.2.3098-3109

Cited by 17 publications

(11 citation statements)

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“…Particles with the size ≤0.08 mm settle very slowly or do not settle at all (<10µm) and predominate in contaminated air. These particles are dangerous for humans due to their ability to penetrate deep into the airways, including the lung alveoli [26][27][28]. According to some authors, wood dust is more dangerous that formaldehyde [29].…”

Section: Introductionmentioning

confidence: 99%

Occupational Exposure to Dust Produced when Milling Thermally Modified Wood

Očkajová

Kučerka

Kminiak

et al. 2020

IJERPH

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During production, thermally modified wood is processed using the same machining operations as unmodified wood. Machining wood is always accompanied with the creation of dust particles. The smaller they become, the more hazardous they are. Employees are exposed to a greater health hazard when machining thermally modified wood because a considerable amount of fine dust is produced under the same processing conditions than in the case of unmodified wood. The International Agency for Research on Cancer (IARC) states that wood dust causes cancer of the nasal cavity and paranasal sinuses and of the nasopharynx. Wood dust is also associated with toxic effects, irritation of the eyes, nose and throat, dermatitis, and respiratory system effects which include decreased lung capacity, chronic obstructive pulmonary disease, asthma and allergic reactions. In our research, granular composition of particles resulting from the process of longitudinal milling of heat-treated oak and spruce wood under variable conditions (i.e., the temperature of modification of 160, 180, 200 and 220 °C and feed rate of 6, 10 and 15 m.min−1) are presented in the paper. Sieve analysis was used to determine the granular composition of particles. An increase in fine particle fraction when the temperature of modification rises was confirmed by the research. This can be due to the lower strength of thermally modified wood. Moreover, a different effect of the temperature modification on granularity due to the tree species was observed. In the case of oak wood, changes occurred at a temperature of 160 °C and in the case of spruce wood, changes occurred at the temperatures of 200 and 220 °C. At the temperatures of modification of 200 and 220 °C, the dust fraction (i.e., that occurred in the mesh sieves, particles with the size ≤ 0.08 mm) ranged from 2.99% (oak wood, feed rate of 10 m.min−1) to 8.07% (spruce wood, feed rate of 6 m.min−1). Such particles might have a harmful effect on employee health in wood-processing facilities.

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Section: Introductionmentioning

confidence: 99%

Occupational Exposure to Dust Produced when Milling Thermally Modified Wood

Očkajová

Kučerka

Kminiak

et al. 2020

IJERPH

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“…Thermogravimetric analysis (TGA) or differential thermal analysis (DTA) has been frequently employed in obtaining kinetic parameters and evaluating the thermal behaviour of woody biomass during pyrolysis though with variety of arguments on the absolute use of model-fitting and isoconversional [3,5,7,8]. Markova et al [9] carried out thermal parameter analyses of beech wood dust and it was reported that, at lower pyrolysis temperature of 260 C, 90% of the beech wood sample degraded. It was further reported that thermal degradation of the beech wood is a single-step mechanism.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of thermal decomposition characteristics and kinetic parameters of melina wood

et al. 2019

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The evaluation of thermal decomposition characteristics and kinetic parameters of melina wood were investigated. Proximate, ultimate and calorific value analyses of the melina wood were carried out based on standards. Melina wood was subjected to multiple heating rates (5-15 C/min) in thermogravimetric experiment. Two prominent isoconversional methods (Flynn-Wall-Ozawa and Starink) were adopted to obtain kinetic parameters from the non-isothermal thermogravimetric analysis curves. The ash, volatile matter and carbon contents of the melina were 2.15, 81.42 and 47.05%, respectively, while the calorific value was 18.72 MJ/kg. The main devolatilization stage of melina ranged from 220 C to 350 C while 80% weight loss was obtained below 400 C. The activation energy varied between approximately 15 and 162 kJ/mol as a function of degree of conversion. The pre-exponential factors varied between 1.60E þ 2 and 5.67 E þ 12/min. The decomposition kinetic mechanism of melina is concluded to be a multi-step reaction.

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“…The formed chip is a polydispersive bulk mass consisting of coarse, medium coarse, and dust fractions. Wood dust with a grain size in interval 1-500 µm [19][20][21][22][23][24][25][26] is a hygroscopic, low abrasive, explosive bulk mass. The ratio of dust particles depends on the characteristics of the processed material, the parameters of the tool, as well as the technical and technological parameters of the machining process [27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Impact of Sycamore Maple Thermal Treatment on a Granulometric Composition of Chips Obtained due to Processing on a CNC Machining Mentre

Kminiak

Dzurenda

2019

Sustainability

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This article deals with a granulometric composition of chips from the milling process of native and thermal treatment maple cuttings on a 5-axial Computer numerical control (CNC) machining center SCM Tech Z5. The aim of this article was to determine the changes in the granulometric composition of chips due to the thermal treatment of wood and to assess the potential risk of the creation of harmful dust fractions. Cuttings were milled with a shank cutter with exchangeable razor blades at feed speed vf = 1 ÷ 5 m·min−1 and material removal e = 3 mm. The thermal treatment in order to modify the color of the maple wood was done with water vapour at temperatures of tI = 112.5 ± 2.5 °C for a period of τ = 5.5 h (Mode I), tII = 127.5 ± 2.5 °C for a period of τ = 6.5 h (Mode II), and tIII = 137.5 ± 2.5 °C for a period of τ = 7.5 h (Mode III). The granulometric composition of the chips was detected by sifting. A granulometric analysis of the chips provided that more than 2/3 of the produced chips are a coarse fraction consisting of flat chips with dimensions over 1 mm. Dust fractions smaller than 500 μm form isometric grains, i.e., chips having approximately the same size in all three dimensions. Inhalable dust particles, smaller than 125 μm, do not exceed a 2.5% share. The granulometric analysis of chips shows that the thermal treatment of maple wood does not create respirable fractions, and therefore, the thermal treatment of the wood does not have a negative impact on the living and working environments.

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Thermal Parameters of Beech Wood Dust

Cited by 17 publications

References 0 publications

Occupational Exposure to Dust Produced when Milling Thermally Modified Wood

Occupational Exposure to Dust Produced when Milling Thermally Modified Wood

Evaluation of thermal decomposition characteristics and kinetic parameters of melina wood

Impact of Sycamore Maple Thermal Treatment on a Granulometric Composition of Chips Obtained due to Processing on a CNC Machining Mentre

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