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Open AccessArticle

Experimental and Modeling Analysis of Brewers´ Spent Grains Gasification in a Downdraft Reactor

1
CT2M—Centre for Mechanical and Materials Technologies, Mechanical Engineering Department of Minho University, 4804-533 Guimarães, Portugal
2
VALORIZA—Research Center for Endogenous Resource Valorisation, Polytechnic Institute of Portalegre, 7300-555 Portalegre, Portugal
3
CIENER-LAETA/Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
*
Author to whom correspondence should be addressed.
Energies 2019, 12(23), 4413; https://doi.org/10.3390/en12234413
Received: 12 October 2019 / Revised: 12 November 2019 / Accepted: 16 November 2019 / Published: 20 November 2019
(This article belongs to the Special Issue Biomass Wastes for Energy Production)
The first part of the current reported work presents experimental results of brewers’ spent grains gasification in a pilot-scale downdraft gasifier. The gasification procedure is assessed through various process characteristics such as gas yield, lower heating value, carbon conversion efficiency, and cold gas efficiency. Power production was varied from 3.0 to 5.0 kWh during the gasification experiments. The produced gas was supplied to an internal combustion engine coupled to a synchronous generator to produce electricity. Here, 1.0 kWh of electricity was obtained for about 1.3 kg of brewers’ spent grains pellets gasified, with an average electrical efficiency of 16.5%. The second part of the current reported work is dedicated to the development of a modified thermodynamic equilibrium model of the downdraft gasification to assess the potential applications of the main Portuguese biomasses through produced gas quality indices. The Portuguese biomasses selected are the main representative forest residues (pine, eucalyptus, and cork) and agricultural residues (vine prunings and olive bagasse). A conclusion can be drawn that, using air as a gasifying agent, the biomass gasification provides a produced gas with enough quality to be used for energy production in boilers or turbines. View Full-Text
Keywords: autothermal gasification; downdraft reactor; thermodynamics; chemical equilibrium; carbon boundary point autothermal gasification; downdraft reactor; thermodynamics; chemical equilibrium; carbon boundary point
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MDPI and ACS Style

Ferreira, S.; Monteiro, E.; Calado, L.; Silva, V.; Brito, P.; Vilarinho, C. Experimental and Modeling Analysis of Brewers´ Spent Grains Gasification in a Downdraft Reactor. Energies 2019, 12, 4413.

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