生物油分级冷凝研究进展

Research Progress in Fractional Condensation of Bio-oil

对生物油分级冷凝的最新成果进行了总结和分析。在分级冷凝装置方面,阐述了通过多种复合式分级冷凝系统在线分离收集生物油的研究现状与进展;从生物油分级产物的理化性质角度分析了生物油高品质利用、提取高价值化工原料的可能性;同时指出了生物油分级冷凝研究中仍存在的问题及未来的研究趋势。

Energy is the base of economic and social development. As a kind of renewable new energy,biological energy has been recognized as a major energy in future world. Pyrolysis is a kind of important method for biomass energy conversion and utilization,and how to effectively condense and separate the gas produced in the process of biomass pyrolysis to yield refined bio-oil has received widespread attention. Preliminary separation and refinement of bio-oil can be achieved by fractional condensation in the process of pyrolysis,which provides the possibility for further comprehensive utility of bio-oil and has been proved to be the best economic method. Focusing on the latest research on fractional condensation of bio-oil,various relatively efficient fractional condensation devices were compared and analyzed,and the physicochemical properties of the product were analyzed and summarized. Seen from the current research results,by controlling reasonable temperature and selecting appropriate condensing medium,multistage condensation device has achieved preliminary hierarchical collection of bio-oil. As for heavy components of fractional condensation, their low water content and high heating value and less small organic molecules make bio-oil more stable,and lead to its physical and chemical properties and components are similar to fossil fuel. So heavy components obtained by multistage condensation can be used as industrial combustion directly or crude bio-oil after further refinement,which is the main alternative to traditional energy. The light components of fractional condensation can be used to agricultural production. Both heavy and light components can be used to extract chemical raw materials with high quality. Meanwhile,due to the complexity of bio-oil components,the mechanism of the condensation is very intricate and there is no consistent discussion and recognition,so the mechanisms of the condensation deserve further study.Furthermore, the components and physicochemical properties of bio-oil obtained by fractional condensation can also be influenced by other factors such as the type of material,the reaction devices and the reaction conditions. So far,the research on fractional condensation is confined only to experimental stage and still far from widespread application. Bio-oil with different components obtained by fractional condensation can＇t be utilized until further refinement,so the research of fractional condensation has a long way to go.