Secondary Reactions of Prompt Biomass Pyrolysis Liquids

这项研究的主要目标是提高现有的对四种工业上重要的可再生材料：木材及其三种主要成分(纤维素、半纤维素和木质素)的热反应行为(包括化学计量和动力学)的了解，重点是木材热解焦油的二次反应。这项工作的具体内容是：系统研究新形成的木材热解液的颗粒外二次反应的速度和程度，包括气相和气固反应，后者可能侧重于木炭的影响；以及对颗粒内二次反应现象的探索性研究，包括液相反应、相对分子质量增长和成炭过程。这些研究有望提供关键的动力学参数和化学计量系数，以进一步实现更好地理解大尺寸生物质颗粒的热反应行为和开发数学上易于处理的整体生物质模拟理论的最终目标。

The broad goal of the research is to improve existing understanding of the thermal reaction behavior (including stoichiometry and kinetics) of four industrially important renewable materials: wood and its three major constituents (cellulose, hemicellulose and lignin), with emphasis on secondary reactions of pyrolysis tars from wood. The specific thrusts of this effort are: systematic studies of the rates and extents of extraparticle secondary reactions of freshly formed wood pyrolysis liquids including examination of both vapor phase and vapor-solid reactions, the latter probably focusing on effects of wood char; and exploratory studies of intra-particle secondary reaction phenomena including liquid phase reactions, molecular weight growth, and char-forming processes. These studies are expected to provide key kinetic parameters and stoichiometric coefficients to further ultimate objectives of better understanding of the thermal reaction behavior of large dimension biomass particles and of developing mathematically tractable whole biomass simulation theories.