Microwave fluidized bed for biomass pyrolysis. Part II: Effect of process parameters

Adam, Mohamed and Beneroso, Daniel and Katrib, Juliano and Kingman, Sam and Robinson, John P. (2017) Microwave fluidized bed for biomass pyrolysis. Part II: Effect of process parameters. Biofuels, Bioproducts and Biorefining . ISSN 1932-1031

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Abstract

The microwave fluidized bed process developed in Part I (DOI: 10.1002/bbb.1780), in which the heating heterogeneity issues are overcome, has been applied to the pyrolysis of biomass. The degree of pyrolysis was established by studying the behavior of sycamore and pine under different operational conditions. Homogeneous heating was obtained, and it is shown that larger particles undergo more pyrolysis within the fluidized bed, consistent with the Biot number. Two limiting values of fluidization velocity were identified, a higher value above which unhydrolyzed particles are entrained with the fluidizing gas and a lower value below which thermal runaway takes place before fluidization. Theoretical correlations for minimum fluidization velocity were found to be unreliable for the biomass used within this study. The energy consumption obtained with optimal process parameters was found to be 3.5–4.2 kJ g−1 to obtain 60–70% of pyrolyzed solid, which is comparable with conventional pyrolysis and presents a significant opportunity for the scale-up of a microwave fluidized bed. The use of a cold fluidizing gas promoted heat losses from the particles and increased the energy consumption; however, it prevented undesired thermal runaway effects. Pine and sycamore required different fluidization velocities and corresponding energy requirements, which was due to the fibrous nature of the feedstock.

Item Type: Article
Keywords: Microwave pyrolysis; Bio-oil production; Biomass fluidization; Microwave scale-up; Energy consumption
Schools/Departments: University of Nottingham, UK > Faculty of Engineering
Identification Number: 10.1002/bbb.1781
Depositing User: Adam, Mohamed
Date Deposited: 05 Jun 2017 09:51
Last Modified: 05 Jun 2017 09:51
URI: http://eprints.nottingham.ac.uk/id/eprint/43377

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