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Maderas. Ciencia y tecnología

versão On-line ISSN 0718-221X

Resumo

TORRES-FUCHSLOCHER, Carlos  e  VARAS-CONCHA, Felipe. Design and efficiency of a small-scale woodchip furnace. Maderas, Cienc. tecnol. [online]. 2015, vol.17, n.2, pp.355-364.  Epub 07-Mar-2015. ISSN 0718-221X.  http://dx.doi.org/10.4067/S0718-221X2015005000033.

Although advances have been made in combustion efficiency in large-scale woodchip furnaces, less experimental results are available at the <20 kW range. Compact feed systems, as well as optimized grates and combustor chambers, continue to represent a challenge for the wider use of low-cost wood chips. This study describes the design and testing of a small-scale woodchip furnace that operates at a range of 9-18 kW. The efficiency test takes account of the feedstock Eucalyptus nitens, with three moisture contents and the combination of different air excess (?) and primary/secondary air ratios. The results reveal a maximum of combustion efficiency of 85% for the low moisture content sample (16%) at ?=1,5 and 82% for samples with 29% and 40% moisture content, at ?= 2,0 and 2,1 respectively. The integrated heat exchanger proved to be highly efficient by reducing gas temperature by up to 69% prior to its exit.

Palavras-chave : Combustion efficiency; fixed grate; hearth appliances; stove design; wood chips.

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