Massaro Sousa, Lucas ORCID: https://orcid.org/0000-0002-4182-9347 and do Carmo Ferreira, Maria (2020) On the performance of a spouted bed type device for feeding spent coffee grounds to a circulating fluidized bed reactor. Chemical Engineering Research and Design, 160. pp. 31-38. ISSN 0263-8762 (doi:10.1016/j.cherd.2020.05.002)

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Abstract

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 < WS < 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 WS. Moreover, WS 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.

Item Type:	Article
Uncontrolled Keywords:	non-mechanical feeder; biomass; spent coffee ground; solids handling
Subjects:	G Geography. Anthropology. Recreation > GE Environmental Sciences T Technology > TP Chemical technology
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Science (SCI) Faculty of Engineering & Science > Wolfson Centre for Bulk Solids Handling Technology
Last Modified:	11 Jun 2022 01:38
URI:	http://gala.gre.ac.uk/id/eprint/35830

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