Heat requirement for fixed bed pyrolysis of beechwood chips

Ábrego, J. (Universidad de Zaragoza) ; Atienza-Martínez, M. (Universidad de Zaragoza) ; Plou, F. ; Arauzo, J. (Universidad de Zaragoza)

Resumen: 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

Idioma: Inglés

DOI: 10.1016/j.energy.2019.04.078

Año: 2019

Publicado en: Energy 178 (2019), 145-157
ISSN: 0360-5442

Factor impacto JCR: 6.082 (2019)

Categ. JCR: THERMODYNAMICS rank: 3 / 61 = 0.049 (2019) - Q1 - T1
Categ. JCR: ENERGY & FUELS rank: 20 / 112 = 0.179 (2019) - Q1 - T1

Factor impacto SCIMAGO: 2.166 - Building and Construction (Q1) - Civil and Structural Engineering (Q1) - Electrical and Electronic Engineering (Q1) - Management, Monitoring, Policy and Law (Q1) - Energy Engineering and Power Technology (Q1) - Fuel Technology (Q1) - Industrial and Manufacturing Engineering (Q1) - Energy (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/UZ/JIUZ-2016-TEC-01

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)
Área (Departamento): Área Tecnologi. Medio Ambiente (Dpto. Ing.Quím.Tecnol.Med.Amb.)