Study of rice husk continuous torrefaction as a pretreatment for fast pyrolysis

• Autor(a) principal: Fleig, Olivia Paniz
• Data de Publicação: 2021
• Outros Autores: Raymundo, Lucas Manique, Trierweiler, Luciane Ferreira, Trierweiler, Jorge Otávio
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/219494
• topic: Casca de arroz; Torrefação; Pirólise; Rice husk; Continuous torrefaction; Fast pyrolysis; Bio-oil

Rice husk (RH) is one of the most available biomasses in southern Brazil. One possible solution is to carry out the fast pyrolysis of RH. To improve the quality of liquid products biomass can be torrefied before being pyrolyzed. The influence of torrefaction on the physical and chemical properties of pyrolysis products was explored. Both torrefaction and pyrolysis reactions were performed in a fluidized bed reactor in a continuous mode. Sample with torrefaction and pyrolysis at 500 ◦C presented the highest biochar yield (44.2 wt.%). The torrefaction step produced a lower yield of bio-oil. In contrast, the highest bio-oil yield (43.6 wt.%) was achieved in the sample without torrefaction at 500 ◦C. The increase in temperature to 750 ◦C provided a specific area of 16.7 m2 /kg for biochar. The highest value of HHV for bio-oil, 28 MJ/kg, was obtained via direct pyrolysis at 750 ◦C, which also led to the lowest water content of 5.9 wt%. According to the NMR analysis, the torrefaction liquid (TL) presented a high quantity of water and alcohols in its composition (92.5 %).