秸秆类生物质基添加剂在粉煤气流床气化中的作用机制

项目名称： 秸秆类生物质基添加剂在粉煤气流床气化中的作用机制

项目编号： No.21306050

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 化学工业

项目作者： 陈雪莉

作者单位： 华东理工大学

项目金额： 25万元

中文摘要： 气流床煤气化技术普遍采用液态排渣，为满足此要求，大量高灰熔点煤在实际气化应用中常需添加钙基等助熔剂或配入低灰熔点煤，不仅在一定程度上增加了原料和能量消耗，甚至可能因为灰分量的增大而导致气化后续设备的堵塞。秸秆类生物质因富含碱金属和碱土金属，气化活性高、灰熔融温度低，本项目充分利用这一特点，将其作为粉煤气流床气化的添加剂，不仅可有效降低煤气化温度、促进气化炉液态排渣，而且也为生物质的大规模、高效、清洁、经济利用提供了一条新的技术途径。本项目围绕粉煤气流床气化的特点和秸秆类生物质的物理化学特性，重点研究煤与秸秆类生物质混合颗粒密相气力输送规律；煤与秸秆类生物质在气流床共气化过程中的成灰机理及熔渣特性，揭示秸秆类生物质基添加剂在粉煤气流床气化中的作用机制。这些研究创新性明显，对丰富和完善气流床气化和气固两相流领域的基础理论有重要意义。前期工作已为完成项目打下坚实基础。

中文关键词： 生物质与煤共气化；二元混合颗粒；流动特性；密相气力输送；灰熔融特性

英文摘要： Entrained-flow gasifiers are all slagging gasifiers. To meet the need of slagging, a large number of coals with high ash fusion temperature are usually either added the addition of flux or blended with low ash fusion temperature coals during gasification, which not only increases the consumption of raw materials but also may result in equipment block-up. Biomass has higher reaction activity and lower ash fusion temperature because of the high content of alkali metals like potassium and natrium and alkali earth metals like calcium and magnesium. Making full use of this feature of biomass, it is proposed that biomass is used as additive of entrained-flow pulverized coal gasification, which not only efficiently reduces gasification temperature and promotes slagging but also provides a new technical approach for large scale, high efficient, clean and economic utilization of biomass. Combining characteristics of entrained-flow pulverized coal gasification and physicochemical properties of biomass, the research focuses on the following contents: dense-phase pneumatic conveying laws of large difference binary mixed particles, ash-forming mechanism and slag characteristic during co-gasification. Based on above researches, the action mechanism of straw biomass-based additives used in entrained-flow pulverized coal gasifi

英文关键词： co-gasification of biomass and coal；binary particle mixture；flow characteristic；dense phase pneumatic conveying；ash fusion characteristic