College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China.
School of Engineering, National Engineering & Technology Research Center of Wood-Based Resources Comprehensive Utilization, Zhejiang Agriculture & Forestry University, Lin'an, Zhejiang 311300, China.
Bioresour Technol. 2017 Mar;228:62-68. doi: 10.1016/j.biortech.2016.12.088. Epub 2016 Dec 24.
This study presented an approach to upgrade biomass and pyrolysis products using a process based on torrefaction liquid washing combined with torrefaction pretreatment. The torrefaction of cotton stalk was first conducted at 250°C for 30min and then the resulting torrefaction liquid products were collected and reused to wash cottonstalk. The pyrolysis of the original and pretreated cotton stalk was performed at 500°C for 15min in a fixed-bed reactor. The results indicated that the combined pretreatment obviously reduced the metallic species in cotton stalk, decreased the water and acids contents while promoted phenols in bio-oil, declined the ash content in biochar, as well as improved the heating value of non-condensable gas. Overall, the combined pretreatment did not only allow to reuse the liquid products issued from torrefaction pretreatment but also improved the quality of biomass and the pyrolysis products, making it a novel promising pretreatment method.
本研究提出了一种利用基于热解液洗涤和热解预处理相结合的方法来升级生物质和热解产物的方法。首先在 250°C 下对棉秆进行热解，持续 30min，然后收集所得热解液产物并重新用于洗涤棉秆。在固定床反应器中，将原始和预处理的棉秆分别在 500°C 下进行 15min 的热解。结果表明，组合预处理明显降低了棉秆中的金属物种，降低了水和酸的含量，同时促进了生物油中的酚类物质，降低了生物炭中的灰分含量，以及提高了不可冷凝气体的热值。总的来说，这种组合预处理不仅允许重复使用热解预处理产生的液体产物，而且还改善了生物质和热解产物的质量，使其成为一种有前途的新型预处理方法。
