98301 20210902121930.0 doi 10.1016/j.apenergy.2020.115842 sideral 120291 ART-2020-120291 eng Greco, Gianluca Universidad de Zaragoza (orcid)0000-0001-6609-1601 Effects of slow-pyrolysis conditions on the products yields and properties and on exergy efficiency: A comprehensive assessment for wheat straw 2020 Access copy available to the general public Unrestricted In the present work, the effects of the peak temperature (400–550 °C), absolute pressure (0.2–0.9 MPa), gas residence time (100–200 s) and reactor atmosphere (pure N2 or a mixture of CO2/N2) on the pyrolysis behavior of wheat straw pellets were investigated. A factorial design of experiments was adopted to assess the effects of the above-mentioned factors on the pyrolysis products, the exergy efficiencies related to them and to the overall process, and the heat required. The pyrolysis energy/exergy assessment is nowadays of great interest, for the scaling of the installations from lab-scale to commercial-scale. Results showed that, as expected, the peak temperature was the most influential factor on the yields and distributions of all the pyrolysis products as well as the char properties related to its potential stability and pore size distribution. However, an increased pressure enhanced the release of the gas species at the expense of the liquid products, without altering the final char yield. The char exergy efficiency was negatively affected by an increase in peak temperature, whereas its effect on the exergy efficiency of the produced gas resulted to be positive. It was also found that pressurized pyrolysis favored the exergy efficiency of the process, even at relatively high pyrolysis peak temperature. For the biomass feedstock and the range of operating conditions studied here, thermodynamic irreversibilities of the pyrolysis system were considerably lowered when the process was conducted at 550 °C, 0.9 MPa and using a mixture of CO2 and N2 as carrier gas at relatively short residence times. info:eu-repo/grantAgreement/ES/DGA-FEDER/T22-20R info:eu-repo/grantAgreement/EC/H2020/721991/EU/Advanced Carbon Materials from Biowaste: Sustainable Pathways to Drive Innovative Green Technologies/ GreenCarbon This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 721991- GreenCarbon info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 9.746 2020 ENGINEERING, CHEMICAL 6 / 143 = 0.042 2020 Q1 T1 ENERGY & FUELS 9 / 114 = 0.079 2020 Q1 T1 3.035 2020 Building and Construction 2020 Q1 Mechanical Engineering 2020 Q1 Management, Monitoring, Policy and Law 2020 Q1 Energy (miscellaneous) 2020 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Di Stasi, Christian Universidad de Zaragoza (orcid)0000-0001-5266-398X Rego, Filipe González, Belén Universidad de Zaragoza (orcid)0000-0001-7125-4997 Manyà, Joan J. Universidad de Zaragoza (orcid)0000-0002-0118-3254 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 279 (2020), 115842 1-13 Appl. energy Applied Energy 0306-2619 1310134 http://zaguan.unizar.es/record/98301/files/texto_completo.pdf Postprint 699325 http://zaguan.unizar.es/record/98301/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:98301 articulos driver 2021-09-02-10:54:34 ARTICLE