Fluid dynamics analysis and pyrolysis of brewer's spent grain in a spouted bed reactor--颗粒学报PARTICUOLOGY

Barrozo, M. A. S., Borel, L. D. M. S., Lira, T. S., & Ataíde, C. H. (2019). Fluid dynamics analysis and pyrolysis of brewer’s spent grain in a spouted bed reactor. Particuology, 42, 199-207. https://doi.org/10.1016/j.partic.2018.06.001

Fluid dynamics analysis and pyrolysis of brewer's spent grain in a spouted bed reactor

Marcos A.S. Barrozo ^a *, Lidja D.M.S. Borel ^a, Taísa S. Lira ^b, Carlos H. Ataíde ^a

a School of Chemical Engineering, Federal University of Uberlândia, Brazil
b Department of Engineering and Technologies, Federal University of Espírito Santo, Brazil

10.1016/j.partic.2018.06.001

Volume 42, February 2019, Pages 199-207

Received 29 November 2017, Revised 4 June 2018, Accepted 7 June 2018, Available online 13 October 2018, Version of Record 21 January 2019.

E-mail: masbarrozo@ufu.br

Highlights

• Good mixing of sand and BSG was observed in a spouted bed.

• Correlations for the prediction of the minimum spouting conditions were proposed.

• Spouted bed pyrolysis produced a bio-oil rich in phenolic compounds.

• The distribution of the products was compared with Py–GC/MS results.

• Secondary reactions can explain variations between analytical and spouted bed pyrolysis.

Abstract

Brewer’s spent grain (BSG) is a large-scale agroindustrial waste that could be more efficiently utilized. This waste is composed of lignocellulosic material and so may serve as a good source of biomass for thermochemical conversion. The present study investigated the fluid dynamics behavior of mixtures of sand and BSG in a spouted bed to assess the viability of the thermochemical conversion of this biomass via fast pyrolysis. Fluid dynamics analyses were performed while varying the mass fraction of BSG (6–80%) and the static bed height (6.6–13.4 cm). Empirical equations for predicting the minimum spouting conditions and the mixing index were obtained using a regression technique, and the selected fluid dynamics parameters were employed in the spouted bed pyrolysis. The bio-oil resulting from this process was rich in phenolic compounds, various nitrogenated compounds (representing precursors for pharmaceuticals) and long-chain hydrocarbons. The products obtained from the analytical and spouted bed pyrolysis processes were also compared.

Graphical abstract

Keywords

Brewer's spent grain; Agroindustrial residue; Spouted bed; Fast pyrolysis; Particle mixing

文章导读