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Study of rice husk continuous torrefaction as a pretreatment for fast pyrolysis
Journal of Analytical and Applied Pyrolysis ( IF 6 ) Pub Date : 2020-12-22 , DOI: 10.1016/j.jaap.2020.104994
Olivia Paniz Fleig , Lucas Manique Raymundo , Luciane Ferreira Trierweiler , Jorge Otávio Trierweiler

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 %).



中文翻译:

稻壳连续焙烧作为快速热解预处理的研究

稻壳(RH)是巴西南部最可用的生物质之一。一种可能的解决方案是对RH进行快速热解。为了提高液体产品的质量,可以在热解之前将生物质进行焙烧。探讨了焙烧对热解产物物理化学性质的影响。焙干和热解反应均在流化床反应器中以连续模式进行。在500°C下进行焙烧和热解的样品具有最高的生物炭收率(44.2 wt。%)。烘焙步骤产生的生物油产率较低。相反,在没有在500°C下烘烤的样品中,获得了最高的生物油产率(43.6 wt。%)。温度升高至750°C,生物炭的比表面积为16.7m²/ kg。最高的生物油HHV值为28 MJ / kg,通过在750°C下直接热解获得的水,这也导致最低含水量为5.9 wt%。根据NMR分析,烘焙液(TL)在其组成中呈现大量的水和醇(92.5%)。

更新日期:2021-01-06
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