生物质气化过程中热解焦与挥发分气体的交互反应机理研究

Gas-solid reaction of solid char with gasify agent and pyrolytic volatiles plays critical role during biomass gasification process. It not only showed great influence on tar cracking, char gasification, but also the evolving of alkali matters, N contained compound emission, and the whole gasification process as well. However, the fundamental theory for gas-solid interaction is still unclear, furthermore it is critical issue for the efficient conversion of tar and char during biomass gasification. Therefore, the study is proposed with focus on the mechanism of interaction mechanism of solid char with volatile gases. The project is carried out with experimental studies, theoretical analysis combined with quantum chemical calculations based on the evolution of biomass chemical macromolecules and the catalytic influence of inherent inorganic compound in biomass resources. Firstly, the gasification mechanism and transformation route of solid char are investigated in depth, especially in the staged gasification process of biomass. Then, the interaction routes between volatile gas and solid char in gas-solid multiphase system during the process of biomass gasification are explored. Simultaneously, the catalytic effect of the inherent alkali matters on char gasification and volatile cracking is analyzed respected to the relation of alkali matters and char matrix. Finally, the converting pathway of char and volatiles and the coupling route during biomass staged gasification is uncovered in molecular level. There shows strong originality and creativity in the mechanism of the reaction pathway of char gasification in complex atmosphere and the interaction with pyrolytic volatiles. The expected outcome is essential for the understanding of biomass gasification theory. It supplies the necessary theoretical reference for the development of biomass gasification technology. It is significant for the utilization of biomass resources. It shows important significance in research and great value in utilization.

固体焦的与挥发分气体气固交互反应作为生物质气化的重要过程，其不仅影响焦油的脱除、焦的气化，对整个气化过程以及碱金属、N等污染物的析出也有重要影响，对生物质气化过程中焦和焦油高效转化至关重要，是气化过程必须考虑的重要因素；但气体挥发分与固体焦的交互作用机制还不清楚。鉴于此，本研究以生物质气化过程中气固交互机制为出发点，采用实验研究、理论分析与量子化学计算结合，从生物质分子结构和固有无机矿物质组成出发，研究复杂氛围中热解焦的气化机理和转化途径，阐述气固多相反应体系中热解挥发分与固体焦的耦合关联机制，揭示碱金属等矿物质对焦炭气化以及气固交互反应的影响机制及关联，从分子层面掌握固体焦气化途径及其与热解挥发分交互耦合机制。在生物质挥发份和焦的气固交互反应及焦气化通道与转化途径的研究方面具有创新。预期成果可为生物质气化机理的揭示以及气化技术的开发提供必要的基础和科学依据，具有重要的研究意义和应用价值。

固体焦的与挥发分气体气固交互反应作为生物质气化的重要过程，其不仅影响焦油的脱除、焦的气化，对整个气化过程以及碱金属、N等污染物的析出也有重要影响，对生物质气化过程中焦和焦油高效转化至关重要，是气化过程必须考虑的重要因素。本研究以生物质气化过程中气固交互机制为出发点，采用实验研究、理论分析与量子化学计算结合，从生物质分子结构和固有无机矿物质组成出发，研究复杂氛围中热解焦的气化机理和转化途径，获得了复杂气氛中生物质热解和气化过程中焦与挥发分的原位气化特性及组成结构演变机制，掌握了固体焦的气化机理与转化途径，揭示了固体焦与气体挥发分的交互耦合机制，确定了碱金属等无机矿物质与固体焦催化与气化的关联机制；构建了生物质分级气化的机理模型，在生物质挥发份和焦的气固交互反应及焦气化通道与转化途径的研究方面具有创新意义，为生物质分级气化以及高效清洁气化技术提供了一定的理论基础，相关成果可为生物质气化机理的揭示以及气化技术的开发提供必要的基础和科学依据，具有重要的研究意义和应用价值，一定程度上推动了生物质气化技术的发展和产业化进程。