Impact of Wood Moisture in Charcoal Production and Quality

Canal, Wagner Davel; Carvalho, Ana Márcia Macedo; Figueiró, Clarissa Gusmão; Carneiro, Angélica de Cássia Oliveira; Fialho, Lucas de Freitas; Donato, Danilo Barros

doi:10.1590/2179-8087.099917

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ORIGINAL ARTICLE, Wood Science and Technology • Floresta Ambient. 27 (1) • 2020 • https://doi.org/10.1590/2179-8087.099917 copy

Impact of Wood Moisture in Charcoal Production and Quality

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The charcoal production when performed in woods with high moisture content negatively impacts the pyrolysis and causes an increase of greenhouse emissions. The aim of this study was to investigate the effects of moisture on the production and quality of charcoal for the pig iron industry. The slow pyrolysis of Eucalyptus sp. was carried out in four different wood moistures, 0, 20, 40 and 60% (dry base). The charcoal and gas yield decreased according to the increase of wood moisture. On the other hand, the bio-oil yield and charcoal friability increased along with the moisture content. The proximate analysis, bulk density and higher heating value of the charcoal were not influenced by the moisture content. The use of wood with moisture content below 20% in the production of charcoal is an alternative to improve productivity, contributing for the economic sustanainability of this sector.

Keywords:
pyrolysis; friability; yield

Property	Parameters	Estimation of parameters	p-value	Regression	Residual standard error	R²
Charcoal yield	β₀	31.47	<0.01*	$y = 31.47 - 0.23 x$	1.36	94.39
Charcoal yield	β₁	−0.23	<0.01*	$y = 31.47 - 0.23 x$	1.36	94.39
Bio-oil yield	β₀	50.34	<0.01*	$y = 50.34 + 0.32 x$	1.55	96.14
Bio-oil yield	β₁	0.32	<0.01*	$y = 50.34 + 0.32 x$	1.55	96.14
Gas yield	β₀	18.20	<0.01*	$y = 18.20 - 0.09 x$	0.91	84.99
Gas yield	β₁	−0.09	<0.20	$y = 18.20 - 0.09 x$	0.91	84.99

Property	Parameters	Estimation of parameters	p-value	Regression	Residual standard error	R²
Friability	β₀	6.46	<0.01*	$y = 6.46 + 0.05 x$	0.43	87.56
Friability	β₁	0.05	<0.01*	$y = 6.46 + 0.05 x$	0.43	87.56
Energy yield	β₀	51.83	<0.01*	$y = 51.83 - 0.37 x$	2.17	94.07
Energy yield	β₁	−0.37	<0.01*	$y = 51.83 - 0.37 x$	2.17	94.07
Fixed carbon yield	β₀	21.61	<0.01*	$y = 21.61 - 0.15 x$	1.04	92.82
Fixed carbon yield	β₁	−0.15	<0.01*	$y = 21.61 - 0.15 x$	1.04	92.82

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[1] CORRESPONDENCE TOClarissa Gusmão Figueiró Universidade Federal de Viçosa (UFV), Av. Peter Henry Rolfs, s/n, Campus Universitário, CEP 36570-900, Viçosa, MG, Brasil e-mail: clarissagfigueiro@gmail.com