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Dive into the research topics where Ana María Arias Álvarez is active.

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Featured researches published by Ana María Arias Álvarez.


Bioresource Technology | 2016

Determination of kinetic parameters for biomass combustion.

Ana María Arias Álvarez; Consuelo Pizarro; Ramón Álvarez García; Julio L. Bueno; Antonio Gutiérrez Lavín

The aim of this work is to provide a wide database of kinetic data for the most common biomass by thermogravimetric analysis (TGA) and differential thermogravimetry (DTG). Due to the characteristic parameters of DTG curves, a two-stage reaction model is proposed and the kinetic parameters obtained from model-based methods with energy activation values for first and second stages in the range 1.75·10(4)-1.55·10(5)J/mol and 1.62·10(4)-2.37·10(5)J/mol, respectively. However, it has been found that Flynn-Wall-Ozawa and Kissinger-Akahira-Sunose model-free methods are not suitable to determine the kinetic parameters of biomass combustion since the assumptions of these two methods were not accomplished in the full range of the combustion process.


Carbohydrate Polymers | 2018

Novel method for holocellulose analysis of non-woody biomass wastes

Ana María Arias Álvarez; Sofía Cachero; Carlos González-Sánchez; Jose Montejo-Bernardo; Consuelo Pizarro; Julio L. Bueno

Compositional analysis of non-woody biomass is quite important to determine its possible applications. However, current standard methods developed for woody biomass compositional analysis have been revealed to be unsuitable when applied to non-woody biomass. Therefore, a novel and less-time consuming modified method which enables for a proper isolation of holocellulose in non-woody biomass samples while increasing lignin degradation has been developed. The novel method mainly consists in a treatment with sodium chlorite and glacial acetic acid at boiling point, which precludes changes in the holocellulose crystallinity degree or losses of carbohydrates, as shown by DSC, XRPD, and HPLC analysis. It was successfully applied to the determination of the structural components of 10 different non-woody biomass samples. Also, its use revealed that non-woody biomass belongs to LHC and LCH groups in the biomass structural composition ternary diagram, which are completely different than the ones the woody biomass belongs to.


WIT Transactions on Ecology and the Environment | 2017

COMPARISON BETWEEN OXIDATIVE AND NON-OXIDATIVE TORREFACTION PRETREATMENT AS ALTERNATIVES TO ENHANCE PROPERTIES OF BIOMASS

Ana María Arias Álvarez; Inés Gutiérrez; Consuelo Pizarro; Antonio Gutiérrez Lavín; Julio L. Bueno

Oxidative and non-oxidative torrefaction pretreatments are the most employed in order to enhance some properties of biomass such as hygroscopicity, low energy density, or poor grindability and so biomass could be a more competitive renewable energy source. The aim of this paper is to compare oxidative and non-oxidative torrefaction processes applying to a pine wood sample. Torrefaction in the range of temperatures 200–250oC was conducted in a tube furnace reactor and proximate and ultimate analyses and heating value determination were carried out in order to characterize the torrefied samples. Torrefaction kinetics were obtained at three different temperatures using a thermogravimetric analyser. Both mass and energy yields in oxidative cases were lower as torrefaction temperature was increased compared to non-oxidative treatment. Heating value data of oxidative option were slightly lower than those of non-oxidative one were, although they were higher than the heating value of raw biomass. According to the proximate analysis, the moisture content decreased from 7.63% in raw biomass to 3.46% and 3.15% in pine torrefied at 250°C in oxidizing and inert atmospheres, respectively. H/C and O/C ratios decrease was more drastic for oxidative torrefaction than for non-oxidative one. In addition, the van Krevelen diagram shows that oxidative torrefaction is more interesting than non-oxidative alternative, this circumstance suggests that any optimizing criterion has to take into account at least three variables, including ultimate analysis and mass and energy yields.


Industrial Crops and Products | 2015

Spanish biofuels heating value estimation based on structural analysis

Ana María Arias Álvarez; Consuelo Pizarro; Roberto García; Julio L. Bueno


European Journal of Investigation in Health, Psychology and Education | 2015

Implicación familiar, autoconcepto del adolescente y rendimiento académico

Ana María Arias Álvarez; Natalia Suárez; Ellián Tuero; José Carlos Núñez; Antonio Valle; Bibiana Regueiro


Revista española de financiación y contabilidad | 1999

Metodología para el diseño e implantación de un sistema de información de gestión para PYMES

Angel Machado Cabezas; José Luis García Suárez; Ana María Arias Álvarez


Fems Microbiology Letters | 1987

Dispersion of a gene that codifies fosfomycin resistance among plasmids from enterobacteriaceae isolated from sewage

Ana María Arias Álvarez; Carlos Hardisson; M. Carmen Mendoza


Forests | 2018

Evaluation of Tree Species for Biomass Energy Production in Northwest Spain

Pedro Álvarez-Álvarez; Consuelo Pizarro; Marcos Barrio-Anta; Asunción Cámara-Obregón; Julio L. Bueno; Ana María Arias Álvarez; Inés Gutiérrez; David F. R. P. Burslem


Energy | 2018

Non-oxidative torrefaction of biomass to enhance its fuel properties

Ana María Arias Álvarez; Dositeo Nogueiro; Consuelo Pizarro; María Matos; Julio L. Bueno


Renewable Energy Focus | 2018

Size-up, monitorization, performance optimization and waste study of a 120 kW in-use wood pellet boiler: A case study

Roberto García; Ana María Arias Álvarez; Consuelo Pizarro; Antonio Gutiérrez Lavín; Julio L. Bueno

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Antoni Juan

University of Barcelona

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