Abstract
The aim of the study was to evaluate the technical and economic viability of a wood dryer in the charcoal production. Drying was carried out for 72 hours using wood from Eucalyptus sp. in two classes of diameter. The average admission temperature of combustion gases in the dryer was 100-150ºC. It was determined the mass of water withdrawn by drying and estimated the amount of wood that would be consumed during the pyrolysis to remove the same amount of water, being this wood converted into charcoal mass. In the economic analysis were determined the indicators net present value, internal rate of return and discounted payback. The dryer presented technical feasibility, reducing wood moisture by 8% and, consequently, increasing the charcoal productivity by 3.3%, and economic viability, with good financial indicators for current market conditions, including a discounted payback of 6 years. In this way, the use of a wood dryer was presented as an efficient way to take advantage of an environmental liability of pyrolysis, which contributes to the increase of sustainability in the charcoal production.
Highlights
Concerns about fossil fuel dependence and climate change have made the use of renewable energy sources a strategic point for the sustainable development of nations (VERMA et al, 2017)
According to the IEA / ARENA Global Renewable Energy Policies and Measures Database, more than 60 countries have national goals or policies to support the use of renewable energy sources (IEA, 2017)
The present study was developed in a charcoal production unit located in the municipality of Martinho Campos - MG
Summary
Concerns about fossil fuel dependence and climate change have made the use of renewable energy sources a strategic point for the sustainable development of nations (VERMA et al, 2017). Brazil is a privileged country in this regard, being responsible for one of the world's most renewable energy matrices, representing 43.5% of these energy sources. It has great potential for expanding the use of this type of resource (WELFLE, 2017). The use of residues from agroforestry industries, in this sense, contributes to the expansion of sustainability and diversification of the national energy matrix. By converting potential environmental liabilities into economically viable by-products, industrial sectors have the opportunity to develop a circular production chain based on the incorporation of residues as integral components of the production system (KORHONEN et al, 2018)
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