含氮生物质中氮元素在超临界水气化过程中会以氮杂环形态参与焦油副产物的生成，焦油量远高于非含氮生物质，生成焦油难以进一步气化，并降低气化效率，同时可引起设备堵塞等问题，因而有必要从氮元素角度进一步探究氮如何在焦油中积聚及对积聚途径的抑制。.本项目针对氮元素在焦油中的积聚与转化机制的问题，从“因素影响、机理解析、途径阻断”三方面展开：首先探究反应参数条件及生物质特性对氮元素在焦油中含量与形态分布规律的影响。其次基于生物质及含氮模型生物质分阶段反应过程试验，筛选分析氮转化关键中间产物的变化规律，构建氮元素在焦油中的积聚与转化途径，从氮元素迁移转化角度解析氮在焦油中的积聚机制。最后借助反应条件参数优化及关键中间产物抑制等手段，促进氮向液相分解转化及向固相固化稳定，阻断氮元素在焦油中的积聚途径，从而减少部分焦油含量。研究成果可为废弃生物质超临界水气化技术应用提供科学依据和技术支持。

Nitrogen can participate in the formation of tar in the form of N-containing heterocycles during the supercritical water gasification of protein-rich biomass. Secondary products, tar, higher than that of non-nitrogenous biomass, which causes a reduction in the gasification efficiency of the process due to the hard further gasification, also lead to reactor plugging. Therefore, it is essential to investigate the accumulation and inhibition mechanisms of nitrogen in tar from the view of nitrogen transformation..To get insight understanding of the role of nitrogen in tar formation, this study carried out from three aspects: “factor influence, mechanism analysis, and pathway blocking”. Firstly, to identify the influence of reaction parameters and biomass composition on the nitrogen distribution in tar. Secondly, to analyze the conditions of formation and consumption of key N-containing intermediates by model compounds, and propose possible reaction pathway of accumulation and conversion of nitrogen to the tar. Analyze the accumulation pathway of nitrogen into tar from the perspective of nitrogen transformation. Lastly, to promote nitrogen conversion by means of reaction parameters optimization and key intermediates inhibition. Blocking the accumulation pathway of nitrogen into tar and reducing tar formation. This study can provide useful insights into gasification mechanisms from waste biomass, as well as the technology support.