On the performance of a spouted bed type device for feeding spent coffee grounds to a circulating fluidized bed reactor

Autor(es)

Massaro Sousa, L. ^[1] ; Ferreira, M. C. ^[1]

Afiliação do(s) autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: CHEMICAL ENGINEERING RESEARCH & DESIGN; v. 160, p. 31-38, AUG 2020.
• Citações Web of Science: 0

Resumo

Using solid biomass wastes as feedstocks for industrial generation of renewable energy is appealing to meet company's energy demands with environmental awareness; however, maintain continuous feeding of wastes to reactors remains a challenge in processing. In this study, the performance of a non-mechanical spouted bed (SB) feeder was evaluated for handling dry and moist spent coffee ground (SCG) powders to a circulating fluidized bed reactor. A comprehensive experimental study was carried out to investigate the effects of operating variables and air inlet nozzle configuration on the solids circulation rates and pressure profiles. Using a convergent nozzle at the air inlet improved feeding stability compared to a conventional orifice air inlet. The circulation rates could be varied from 3.0 < W-S < 11.0 g/s by adjusting the air flowrate and the entrainment length. Although SB performance was affected by the powder's flowability, the feeder operation was rather stable, with fluctuations less than 20% in W-S. Moreover, W-S could be accurately predicted from pressures measured at the feeder and riser. The SB showed enhanced flexibility in handling SCGs with different properties compared to a non-mechanical L-valve. It suggests that SBs might be an appealing alternative to feed waste biomass powders into reactors in a continuous mode. (C) 2020 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved. (AU)

• 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
• 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