燃料化学学报Issue(7)：792-798,7.
生物质气化过程中碱金属和碱土金属的析出特性研究
Releasing behavior of alkali and alkaline earth metals during biomass gasification
摘要
Abstract
The releasing characteristics of alkali and alkaline earth metals (AAEMs) during CO2 gasificationprocess of biomass and pyrolyzed char were explored in a fixed bed reactor. The amount of AAEMs releasing during the gasification of various feedstocks at different pyrolysis temperatures was determined by atomic absorption spectroscopy. Differences in weight loss of biomass during gasification are resulted from the diversity of volatile content in different biomass feedstocks. Along with the increasing of pyrolysis temperature, thereactivity of char gasification is decreased. It is found that the releasing amount of Na is larger than that of K , and that of alkaline earth metals is less, which is related to their existence form and metal valence. Theincreasing of pyrolysis temperature can improve the release of K at low temperatures on the release of Na during the whole pyrolysis and gasification process. The type of biomass especially the Si , while it has little influence content in ash has a significant impact on the migration of Ca and Mg, and higher char gasification conversionleads to a larger releasing amount of AAEMs. Results of thermodynamic calculations show that K and Na are released mostly in the form of chloride, while Ca and Mg mainly exist in the form of silicate which is hard torelease.关键词
生物质/气化/碱金属及碱土金属/热力学计算Key words
biomass/gasification/AAEMs/thermodynamic calculation分类
能源科技引用本文复制引用
韩旭,张岩丰,姚丁丁,钱柯贞,杨海平,王贤华..生物质气化过程中碱金属和碱土金属的析出特性研究[J].燃料化学学报,2014,(7):792-798,7.基金项目
国家重点基础研究发展规划(973计划,2013CB228102) （973计划,2013CB228102）
国家自然科学基金(51376076)。 （51376076）
