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炉内灰渣沉积物中矿物元素分布的电子探针分析
引用本文:兰泽全,曹欣玉,周俊虎,赵显桥,饶甦,周志军,刘建忠,岑可法. 炉内灰渣沉积物中矿物元素分布的电子探针分析[J]. 中国电机工程学报, 2005, 25(2): 0-119
作者姓名:兰泽全  曹欣玉  周俊虎  赵显桥  饶甦  周志军  刘建忠  岑可法
作者单位:浙江大学热能工程研究所,能源洁净利用与环境工程教育部重点实验室,浙江省,杭州市,310027
摘    要:提出了一种研究煤灰沉积机理及形成过程的新方法。从炉内选取5个不同部位的灰渣样品,利用电子探针对各矿物元素沿样品厚度方向的分布进行了分析,结果表明,Si和Al具有几乎完全一致的分布。X-射线衍射分析表明形成的主要矿物质为铝硅酸盐(如霞石);积灰沉积物中Na与S的分布规律相似,主要以无水芒硝形式存在,部分结渣沉积物中的Na与Fe具有相似的分布。在初始层内,4个结渣样品中主要致渣元素的分布相似,而与积灰样品中的相反,表明积灰和结渣在机理上是不同的,受炉内局部空气动力场、气氛条件和温度水平等的控制。研究结果可为模拟灰沉积数学模型的建立或改进,以及防结渣添加剂、清灰剂的研制开发提供重要的依据和指导。

关 键 词:锅炉 炉内过程 灰渣沉积物 矿物元素 电子探针分析 热效率
文章编号:0258-8013(2005)02-0114-06
收稿时间:2003-12-03
修稿时间:2004-06-15

THE ELECTRON PROBE ANALYSIS OF MINERAL ELEMENTARY DISTRIBUTION AT ASH DEPOSITION FROM FURNACE
LAN Ze-quan,CAO Xin-yu,ZHOU Jun-hu,ZHAO Xian-qiao,RAO Su,ZHOU Zhi-jun,LIU Jian-zhong,CEN Ke-fa. THE ELECTRON PROBE ANALYSIS OF MINERAL ELEMENTARY DISTRIBUTION AT ASH DEPOSITION FROM FURNACE[J]. Proceedings of the CSEE, 2005, 25(2): 0-119
Authors:LAN Ze-quan  CAO Xin-yu  ZHOU Jun-hu  ZHAO Xian-qiao  RAO Su  ZHOU Zhi-jun  LIU Jian-zhong  CEN Ke-fa
Abstract:A novel method is presented in this paper to study the coal ash deposition mechanism and formation process. The electron probe microanalyzer is employed to analyze the mineral elementary distribution along thickness direction in ash deposits, sampled from five various locations inside the test furnace. The results show Si and Al have the almost same distribution pattern, which indicates essential mineral matter in ash deposits is aluminosilicate, such as nepheline, according to XRD analysis. In fouling deposits Na and S distribution trends are the same, which exists in form of thenardite mainly. The distribution of Na and Fe are similar in some samples of slagging deposits. At the initial layer, the principal mineral elementary distributions are similar among four slagging deposits, which is contrary with that of fouling deposit It indicates that the formation mechanisms of fouling is different from slagging, controlled by local aerodynamic fields, atmosphere and temperature level inside furnace. The results can provide important references and instructions for the foundation or improvement of ash deposition mathematical model, as well as the exploitation of anti-slagging additives and deashing agents.
Keywords:Thermal power engineering  Ash deposition  Mineral elementary  Initial deposition layer  Fouling and slagging
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