燕麦秸秆燃烧灰中矿物质分布及沉积行为-山东大学学报.PDF

第40卷 第11期 燃摇 料摇 化摇 学摇 学摇 报 Vol.40 No.11 2012年11月 Journal of Fuel Chemistry and Technology Nov. 2012 文章编号:0253鄄2409(2012)11鄄1310鄄07 燕麦秸秆燃烧灰中矿物质分布及沉积行为 杨天华,丁佳佳,李润东,开兴平,孙摇 洋,刘摇 炜 (沈阳航空航天大学 辽宁省清洁能源重点实验室,辽宁沈阳摇 110136) 摘摇 要:在自行设计的沉降炉内研究了燕麦秸秆燃烧灰中矿物质分布及沉积行为。 采用X射线衍射(XRD)、扫描电镜能谱 (SEM/ EDS)及电子探针X射线显微(EPMA)对850益下不同燃烧时间的沉积物进行分析,并结合化学热力学平衡计算,结果 表明,燕麦秸秆燃烧的沉积物形成是碱金属挥发黏结作用使大小不同的燃料球团形成,内部伴随着氧化反应从而形成表面孔 洞。 钾长石是沉积物形成中起黏结和支撑作用的“骨架冶的主要组成部分,在燕麦秸秆燃烧初始沉积中有重要作用。 K、Al 的 分布密集而广泛,Na在一定程度上会促进K 的活性,表面的部分碱金属逐渐挥发至气相,Fe、Ca、Mg等的相关化合物不断填 充沉积物孔隙使其致密、硬化,最终各元素较均匀地分配。 关键词:生物质;燃烧;沉积物;碱金属;化学热力学平衡计算 中图分类号:TK6摇 摇 文献标识码:A Characteristics of mineral distribution and deposition behavior in the ash of oat straw combustion YANG Tian鄄hua,DING Jia鄄jia,LI Run鄄dong,KAI Xing鄄ping,SUN Yang,LIU Wei (Liaoning Key Laboratory of Clean Energy,ShenyangAerospace University,Shenyang摇 110136,China) Abstract:The effects of combustion time on the characteristics of mineral distribution and deposition behavior were carried out in a self鄄designed drop鄄tube furnace during oat straw combustion. The thermodynamic equilibrium calculationswere used to predict the results. Meanwhile,the ashes of different combustion time at 850 益 were analyzed by XRD,SEM/ EDS and EPMA. The results show that the initiative formations of oat straw deposition are alkali metal species which can cohere with fuels,then form particles with different sizes. Holes canbeformedintheseparticlessurfacebyinternaloxidationreaction. Itisfoundthatpotassiumfeldsparis the main specieswhich actsasanimportantrolein cementingactionand supporting structure. Therearemany K and Al species enriched in the initial deposition. In addition,Na can promote the activity of K in some degree. Some K andNa speciesinthedepositionvolati