煤和生物质共热解过程中半焦的作用机制研究

项目名称： 煤和生物质共热解过程中半焦的作用机制研究

项目编号： No.51306029

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 能源与动力工程

项目作者： 全翠

作者单位： 西安交通大学

项目金额： 25万元

中文摘要： 在煤和生物质共热解过程中，如何实现H和O的定向转化获取高产率和高品质的热解油是极具挑战性的学术研究课题。半焦作为热解反应体系中的主要中间产物之一，其对共热解过程中主要元素的迁移和产品分布无疑具有重要作用。但目前鲜有研究将半焦作为煤和生物质共热解的研究主体。本项目拟在自由落下床开展生物质和煤的快速共热解实验，以煤和生物质共热解产生的原位半焦为主要研究对象，分析共热解过程中半焦的形成机制，阐明半焦反应性与其组分、结构的关系；研究煤和生物质共热解产物分布和产物性质，明确半焦对热解中间产物的二次反应的作用机理及其对H和O定向迁移的影响机制；借助电子顺磁共振波谱研究煤和生物质共热解过程中自由基变化规律，阐明半焦对二次反应过程中自由基形成、转移的影响，揭示煤和生物质共热解高品质焦油形成机理。本项目将为生物质和煤快速共热解制油的高效、定向转化的理论和技术体系的构建提供理论依据。

中文关键词： 生物质；煤；共热解；半焦；油品提质

英文摘要： How to achieve directional conversion of H and O in order to obtained high yield and high quality pyrolysis oil during co-pyrolysis of coal and biomass is a challenging academic research topic. Char, one of the main intermediate product in pyrolysis reaction system, will undoubtedly plays an important role in the migration of the main elements and product distribution in the process of co-pyrolysis. However, seldom study had investigated the role of char during co-pyrolysis. In this project, the co-pyrolysis experiment of coal and biomass was carried out in a free fall reactor. The in situ char generated during co-pyrolysis is taken as the research object. The formation mechanism of char during co-pyrolysis was analyzed, and the relationship between the char reaction to its components, structure was clarified. Through studying product distribution and product properties of coal and biomass co-pyrolysis, the mechanism of char on the intermediate pyrolysis product in secondary reaction and on the directional migration of H and O were discussed. At last, electron paramagnetic resonance was applied to study the rule of free radical change during co-pyrolysis. The effect of char on the formation and transfer of free tadicals in secondary reaction processes was claried and then the formation mechanism of high quality

英文关键词： biomass；coal；co-pyrolysis；char；oil upgrading