Journal
BIOMASS & BIOENERGY
Volume 93, Issue -, Pages 60-71Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.biombioe.2016.06.015
Keywords
Biomass pyrolysis; Biomass gasification; Fast pyrolysis; Lumped mechanism; Bio-oil; Tars
Funding
- European Union [654650]
- CAPES Foundation, Ministry of Education of Brazil-Science without Borders Mobility Program-Full PhD Scholarship [10131/13-2]
- H2020 Societal Challenges Programme [654650] Funding Source: H2020 Societal Challenges Programme
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Comprehensive chemical models to describe the behavior of biomass pyrolysis, gasification and combustion are crucial for the simulation and design of thermochemical processes of ligno-cellulosic materials. Despite this importance, reliable and predictive models are still not well known. The original aspect of this work is to present a comprehensive and predictive model of pyrolysis, gasification, and combustion, starting from biomass characterization, through the description of released volatiles at the particle scale, until the effect of the secondary gas-phase reactions at the reactor scale. All these aspects can play a relevant role in the biomass thermo-valorization processes. Most of released species from biomass devolatilization are oxygenated hydrocarbons. This study aims at identifying some reference rate parameters, based on analogy and thermochemistry rules, for the different reaction classes. Once rate rules are defined, they allow an easy extension to analogous compounds. In this way, the kinetic mechanism already developed for jet and diesel fuels is extended to the new tar species released by biomasses. Despite unavoidable approximations when the interest is also at the reactor scale, this model is the only one, to our knowledge, able to describe the whole process from biomass to final products, in a predictive and satisfactory way. (C) 2016 Elsevier Ltd. All rights reserved.
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