Experimental Study of Entrainment and Mixing of Renewable Active Particles in Fluidized Beds

Autor: Pal Szentannai, Mohamed Sobhi Alagha, Botond Szucs
Jazyk: angličtina
Rok vydání: 2020
Předmět:
bark
020209 energy
entrainment
Mixing (process engineering)
02 engineering and technology
lcsh:Technology
lcsh:Chemistry
fluidized bed
020401 chemical engineering
active particle
0202 electrical engineering
electronic engineering
information engineering
mixing
General Materials Science
Coal
0204 chemical engineering
lcsh:QH301-705.5
Instrumentation
Refuse-derived fuel
sunflower shell
Fluid Flow and Transfer Processes
lcsh:T
business.industry
Process Chemistry and Technology
Fossil fuel
General Engineering
Fluid mechanics
Mechanics
lcsh:QC1-999
wheat shell
Computer Science Applications
lcsh:Biology (General)
lcsh:QD1-999
lcsh:TA1-2040
Fluidized bed
SRF/RDF
Particle
Environmental science
renewable
lcsh:Engineering (General). Civil engineering (General)
Entrainment (chronobiology)
business
fuel
lcsh:Physics
Zdroj: Applied Sciences
Volume 10
Issue 12
Applied Sciences, Vol 10, Iss 4268, p 4268 (2020)
ISSN: 2076-3417
DOI: 10.3390/app10124268
Popis: Fluidized bed combustors were initially designed and built basically for the utilization of fossil fuels, mostly coal. The actual worldwide trend of transitioning from fossil fuels to renewables requires sufficient knowledge on the fluid mechanics of these new particle types because of the significant differences in their shapes, sizes, densities, and homogeneities. This article presents experimental results on the particle entrainment and mixing of some industrially relevant fuels such as solid refused fuel/refuse derived fuel (SRF/RDF), bark, sunflower shell, and wheat shell. The measurements were performed on a lab-scale fluidized bed experimental facility. The results show that sunflower shell is entrained in the highest degree
however, at very low velocity, the entrainment of wheat shell is the most intensive. The entrainment behaviors of the investigated SRF and bark samples are similar. On the other hand, the mixing results showed that the SRF has relatively high mass fractions in the bottom and centeral regions of the fluidized bed at low superficial velocities, while at elevated velocities, the entire mass of this fuel is shifted upwards. Interestingly, just the opposite tendency can be observed in cases of all other investigated biomass fuels. Finally, the nonspherical renewable active particles have markedly higher concentrations in the bottom region of the bed compared to spherical ones.
Databáze: OpenAIRE
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