On the design of conical hoppers for spent coffee grounds: Moisture content and particle-size effects

Autor(es)

Sousa, L. Massaro ^{[1, 2]} ; Schulz, C. G. ^[3] ; Condotta, R. ^[3] ; Ferreira, M. C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Drying Ctr Pastes Suspens & Seeds, Chem Engn Dept, POB 676, BR-13565905 Sao Carlos - Brazil

^[2] IFP Energies Nouvelles, Proc Design & Modeling Div, F-69360 Solaize - France

^[3] Ctr Univ FEI, Chem Engn Dept, Av Humberto de Alencar Castelo Branco 3972, BR-09850901 Sao Bernardo Do Campo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Food Engineering; v. 300, JUL 2021.
• Citações Web of Science: 1

Resumo

Spent coffee ground (SCG) is a food waste with promising potential for reuse in pilot-to-industrial scale processes provided that storage and handling issues are overcome. Here some key bulk and flow properties of SCGs were determined with FT4 rheometer, for powders with different particle-size distribution (249.1 <= d(V) <= 583.1 mu m) and moisture content (2.8% <= MC <= 62.5%). These properties were used to evaluate the design of mass-flow silo hoppers following the classical Jenike theory. The SCGs flowability worsened by decreasing d(V) and increasing MC, with indexes between 1.09 <= HR <= 1.92 and 2.5 <= FF <= 15.0. The minimum hopper inclination and outlet diameter ranged from 9.9 degrees to 17.1 degrees and 0.40-1.00 m. A sensitivity analysis for the hopper design was performed, and a densification equation was coupled to Jenike's method to ease future hopper designs for SCGs with different properties. Ultimately, the results showed that careful consideration must be given to d(V) and MC to design effective devices to handle SCGs. (AU)

• Processo FAPESP: 18/11031-8 - Estudo sobre o desempenho de válvulas não-mecânicas como alimentadores de pós de biomassa em reatores de leito pneumático circulante: análise via fluidodinâmica computacional (CFD)
• Beneficiário: Lucas Massaro Sousa
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto
• Processo FAPESP: 16/25946-2 - Estudo sobre o desempenho de válvulas não-mecânicas como alimentadores de pós de biomassa em reatores de leito pneumático circulante
• Beneficiário: Lucas Massaro Sousa
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto