148165 20250114175434.0 doi 10.1016/j.energy.2019.04.078 sideral 112434 ART-2019-112434 eng Ábrego, J. Universidad de Zaragoza (orcid)0000-0003-4493-6540 Heat requirement for fixed bed pyrolysis of beechwood chips 2019 The evaluation of heat of pyrolysis reactions at conditions relevant to the industrial practice is of great importance from the point of view of reactor design. Here, the evolution of heat during the pyrolysis of beechwood chips was experimentally measured in a lab-scale fixed bed pyrolysis system. Wood was heated and pyrolyzed by means of heat transferred from a mass of surrounding inert material (sand) initially heated at temperatures between 400 and 800 °C. Monitoring the evolution of temperatures in the system allowed calculation of heat for pyrolysis (Q P ) as a function of wood bed temperature. At pyrolysis conditions where slow heating rates of the wood bed are realized, changes in Q P were clearly linked to the decomposition of the individual constituents of biomass (cellulose, hemicellulose and lignin), with consecutive exothermic and endothermic stages. When high temperature gradients were present, these stages were simultaneous and Q P continuously increased with temperature, reaching 550 kJ kg -1 . Under these circumstances, a correlation is provided for Q P (T) up to 556 °C. The enthalpy of the pyrolysis reactions (¿H P ) was also estimated. Results show good coincidence with previously reported literature values. The proposed experimental system could be useful for determining heat requirements of pyrolysis under different operational conditions. © 2019 Elsevier Ltd Access copy available to the general public Unrestricted info:eu-repo/grantAgreement/ES/UZ/JIUZ-2016-TEC-01 info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 6.082 2019 THERMODYNAMICS 3 / 61 = 0.049 2019 Q1 T1 ENERGY & FUELS 20 / 112 = 0.179 2019 Q1 T1 2.166 2019 Building and Construction 2019 Q1 Civil and Structural Engineering 2019 Q1 Electrical and Electronic Engineering 2019 Q1 Management, Monitoring, Policy and Law 2019 Q1 Energy Engineering and Power Technology 2019 Q1 Fuel Technology 2019 Q1 Industrial and Manufacturing Engineering 2019 Q1 Energy (miscellaneous) 2019 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Atienza-Martínez, M. Universidad de Zaragoza (orcid)0000-0002-5047-5106 Plou, F. Arauzo, J. Universidad de Zaragoza (orcid)0000-0002-5959-3168 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 5005 790 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Tecnologi. Medio Ambiente 178 (2019), 145-157 Energy Energy 0360-5442 743229 http://zaguan.unizar.es/record/148165/files/texto_completo.pdf Postprint 1505202 http://zaguan.unizar.es/record/148165/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:148165 articulos driver 2025-01-14-15:48:39 ARTICLE