Energy density of lignocellulosic biomass briquettes and its relationship with briquetting parameters

• Autor(a) principal: Souza, Frederico de
• Data de Publicação: 2016
• Outros Autores: Vale, Ailton Teixeira do
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Pesquisa Florestal Brasileira (Online)
• Texto Completo: https://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/879
• topic: Bioenergia; Compactação de biomassa; Resíduos agroflorestais; Bioenergy; Biomass compression Agroforestry waste

Energy density is one of the main properties that define the quality of briquette as it summarizes chemical characteristics, moisture conditions and amount of heat of the final product in only one variable. We made six briquettes per treatment (pine, tauari, cumaru, rice husk, sugarcane bagasse and jatropha press cake) in a briquetting press Lippel LB-32 model with 40 g biomass each and 5 min of pressing. Briquetting parameters evaluated were: two temperatures (130 and 200 °C), two compacting pressures (80 to 120 kgf cm-²) and two particle sizes (thick - retained on 35 mesh sieve, thin - passing through 35 mesh sieve). The energy density was obtained by multiplying the useful heat content by bulk density. Additionally, we carried out chemical analysis. Forest residues had fixed carbon 9.0% higher and ash 2.3% lower when compared to agricultural waste. Briquettes bulk density ranged from 1.088 to 1.305 g cm-³ and energy density between 3.11 and 4.67 Gcal m-³. Cumaru briquettes were considered of better quality, presenting 1.23 g cm-³ and 4.61 Gcal m-³ respectively for bulk and energy densities. It was concluded that the effect of temperature favors briquettes quality, overcoming effects of compression pressure and particle size.