Upscaling Severe Torrefaction of Agricultural Residues to Produce Sustainable Reducing Agents for Non-Ferrous Metallurgy
| Autor: | André Chatroux, Maguelone Grateau, Elvira Rodriguez-Alonso, Thierry Melkior, Elie Lacombe, Hary Demey, Sébastien Thiery, Nicolas Jaricot, Muriel Marchand |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Mining engineering. Metallurgy Reducing agent agricultural biomass almond shells olive stones pilot-scale torrefaction reducing agents Batch reactor Metals and Alloys TN1-997 chemistry.chemical_element Thermal treatment Proximate Torrefaction Pulp and paper industry Pilot plant chemistry media_common.cataloged_instance General Materials Science European union Carbon media_common |
| Zdroj: | Metals, Vol 11, Iss 1905, p 1905 (2021) Metals; Volume 11; Issue 12; Pages: 1905 |
| ISSN: | 2075-4701 |
| Popis: | Torrefaction of almond shells and olive stones, which are typically considered agricultural waste in the southern regions of the European Union, was investigated in this work for application as reducing agents in the metallurgical industry. Four different temperatures were tested: 250, 280, 300 and 350 °C. The evolution of the solid yields with the temperature was determined with TGA measurements. This showed that the duration of torrefaction should not exceed 45 min. The kinetic profiles were successfully fitted using the pseudo-first-order rate equation (PFORE). Then, torrefaction for 45 min was systematically carried out at every temperature and for each resource in a laboratory-scale batch device. The raw and torrefied biomasses were characterized using proximate, ultimate and calorific analyses. The carbon/oxygen ratio and the heating values were increased as a result of the torrefaction severity (from 20 MJ/kg for both raw biomasses to 30 MJ/kg at 350 °C). The highest mass losses were obtained at the highest temperature (67.35 and 65.04 %w for almond shells and olive stones, respectively, at 350 °C). The fixed carbon value also increased, being higher than 67 %w for torrefaction at 350 °C. The large-scale torrefaction at 350 °C (45 min) of these biomasses was carried out in a continuous pilot plant. The solids were characterized as well, and their properties were close to those of the biomasses torrefied in the laboratory-scale batch reactor under the same conditions. This thermal treatment provided biochars with all the required properties to be used as reducing materials in metallurgy. |
| Databáze: | OpenAIRE |
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