Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), 424 Hafez Avenue, Tehran 1591634311, Iran.
Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), 424 Hafez Avenue, Tehran 1591634311, Iran.
Bioresour Technol. 2020 Sep;311:123561. doi: 10.1016/j.biortech.2020.123561. Epub 2020 May 20.
The aim of this work was to study fast pyrolysis of three microalgae species in a continuous bench-scale conical spouted bed reactor at 500 °C. Bio-gas, bio-oil and bio-char yields have been determined and characterized by using GC, GC/MS, elemental analyzer and SEM. Bio-oil was the main product obtained through pyrolysis of microalgae. The non-condensable gaseous stream is made up of mainly hydrogen, carbon monoxide and carbon dioxide, apart from other light hydrocarbons detected in lower concentration, as are methane, ethane, ethylene, propane and propylene. The compounds identified in the bio-oil have been categorized into hydrocarbons, nitrogen containing compounds, ketones, alcohols, acids, lactones, phenols and aldehydes. The nitrogen and carbon contents of the microalgae bio-chars are higher than those for bio-chars derived from other biomasses. Pyrolysis improved the morphology and porous structure of microalgae. Finally, the mechanism involving microalgae pyrolysis has been approached and the main reaction pathways have been proposed.
本工作旨在研究三种微藻在 500°C 的连续锥形喷动床反应器中的快速热解。通过气相色谱、气相色谱/质谱、元素分析仪和扫描电子显微镜（SEM）对生物气、生物油和生物炭的产率和特性进行了测定和表征。生物油是通过微藻热解获得的主要产物。不可冷凝的气态物流主要由氢气、一氧化碳和二氧化碳组成，此外还检测到浓度较低的其他轻烃，如甲烷、乙烷、乙烯、丙烷和丙烯。在生物油中鉴定出的化合物分为烃类、含氮化合物、酮类、醇类、酸类、内酯类、酚类和醛类。微藻生物炭的氮和碳含量高于其他生物质衍生的生物炭。热解改善了微藻的形态和多孔结构。最后，探讨了涉及微藻热解的机制，并提出了主要的反应途径。
