Kinetic modeling of coal/agricultural by-product blends

Vamvuka, D; Pasadakis, N; Kastanaki, E; Grammelis, P; Kakaras, E

dc.contributor.author	Vamvuka, D	en
dc.contributor.author	Pasadakis, N	en
dc.contributor.author	Kastanaki, E	en
dc.contributor.author	Grammelis, P	en
dc.contributor.author	Kakaras, E	en
dc.date.accessioned	2014-03-01T01:19:05Z
dc.date.available	2014-03-01T01:19:05Z
dc.date.issued	2003	en
dc.identifier.issn	08870624	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15369
dc.subject	Kinetic Model	en
dc.subject.other	Activation energy	en
dc.subject.other	Agricultural products	en
dc.subject.other	Biomass	en
dc.subject.other	Byproducts	en
dc.subject.other	Coal	en
dc.subject.other	Combustion	en
dc.subject.other	Decomposition	en
dc.subject.other	Fossil fuels	en
dc.subject.other	Pyrolysis	en
dc.subject.other	Reaction kinetics	en
dc.subject.other	Renewable energy resources	en
dc.subject.other	Thermogravimetric analysis	en
dc.subject.other	Agricultural by-product blends	en
dc.subject.other	Devolatilization	en
dc.subject.other	Thermochemical processes	en
dc.subject.other	Blending	en
dc.title	Kinetic modeling of coal/agricultural by-product blends	en
heal.type	journalArticle	en
heal.identifier.primary	10.1021/ef020179u	en
heal.identifier.secondary	http://dx.doi.org/10.1021/ef020179u	en
heal.publicationDate	2003	en
heal.abstract	There is renewed interest worldwide in the production of sustainable energy from renewable sources, such as biomass, aimed mainly at the decrease of fossil fuels use. Except for its potential to be CO2 ""neutral"" during combustion, biomass has a low sulfur content and a high volatile concentration: these characteristics favor clean combustion conditions. The knowledge of the kinetics of biomass pyrolysis and combustion is important for the control of such thermochemical processes. The main objective of this work was to determine the kinetic parameters of thermal decomposition of two biomass materials, olive kernel and straw, and of their mixtures with a high- and a low-rank coal. The study was carried out using a thermogravimetric analyzer (TGA) in nitrogen atmosphere, at a heating rate of 10°C/min. A kinetic model, involving first-order independent parallel reactions, was used. Activation energies and frequency factors were determined for two different particle sizes. The analysis indicated that the pyrolysis of the coals and the biomass samples could be modeled successfully via the independent reactions models, the pyrolysis of biomass being described by reactions corresponding to hemicellulose, cellulose, and lignin decomposition. The results showed that the chemical composition of each biomass type plays a fundamental role in the kinetics determination. Smaller conversion times and increased devolatilization rates were obtained, when biomass was added in the fuel blend with coal. The additive properties of coal and biomass, pyrolyzed in blends, were examined. It was proven that the mass loss vs time during thermal conversion of coal/biomass blends is well-described by the sum of each individual coal and biomass decomposition.	en
heal.journalName	Energy and Fuels	en
dc.identifier.doi	10.1021/ef020179u	en
dc.identifier.volume	17	en
dc.identifier.issue	3	en
dc.identifier.spage	549	en
dc.identifier.epage	558	en