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Feeding biomass powders into circulating fluidized bed reactors using non-mechanical devices: a computational fluid dynamics (CFD) analysis

Grant number: 18/11031-8
Support type:Scholarships abroad - Research Internship - Doctorate (Direct)
Effective date (Start): January 15, 2019
Effective date (End): January 14, 2020
Field of knowledge:Engineering - Chemical Engineering
Principal Investigator:Maria Do Carmo Ferreira
Grantee:Lucas Massaro Sousa
Supervisor abroad: Aibing Yu
Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
Local de pesquisa : Monash University, Australia  
Associated to the scholarship:16/25946-2 - Study on the performance of non-mechanical valves as feeders devices of biomass powders in circulating fluidized beds reactors, BP.DD

Abstract

Biomass residues are generated in huge amounts in processing and are often used as a feedstock in industrial-scale energy cogeneration processes. In spite of that, a common problem in the operation of thermoelectric reactors is to ensure a stable, efficient and low-cost feeding of the particulate materials into the reactor. The solids feeding can be particularly limiting when using biomass particles, as these powders have unusual characteristics in terms of size distribution, composition and shape when compared to the conventional materials. The operability of feeding devices is also affected by the feeder's configuration and geometry, resulting in a complex interaction of factors to be simultaneously evaluated. The influence of this whole set of variables on the flow has not been clearly assessed so far. The aims of this internship project are: to perform Computational Fluid Dynamics (CFD) simulations aimed at describing two-phase flow of biomass powders in Circulating Fluidized Bed (CFB) reactors using the spouted bed and L-valve feeding devices; to investigate the flow patterns in the valves, standpipe and riser; to analyze scale-up features of the feeding devices and to perform a model verification by comparing the simulations with experimental data, acquired in the Drying Center of the Federal University of São Carlos, Brazil (FAPESP grant 2016/25946-2). Specifically, the influence of the mean diameter, moisture content of spent coffee ground powders, as well as aeration velocities and riser diameter on feeders' operability will be verified.

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