Development of CCSEM analysis system and study on the fly ash formation during sludge combustion in an incinerator

CCSEM分析系统开发及焚烧炉污泥燃烧飞灰生成研究

基本信息

批准号：
11650801
负责人：
NINOMIYA Yoshihiko
金额：
$ 1.02万
依托单位：
CHUBU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650801/
关键词：
CCSEM Analysis Fly ash Waste combustion Trace element Ash melting Sludge CCSEM 飛灰重金属燃焼メカニズム

项目摘要

In this study, we developed the technique for sludge char measurement of computer-controlled scanning electron microscope (CCSEM). The data between composition and particle size of inorganic particles in a char was collected successfully. As this result, it would be possible that we obtained the information of several thousand levels for one sample. The following was studied during the period of this project.1)Verification of the particle size distribution and the EDS analysis2)Combustion experiment of the sludge and CCSEM analysis of sludge and its charIt was found that the luminance distribution of the SEM image affected particle size distribution and precision of chemical composition analysis. By the storage of the data, it was possible to find the optimum value of luminance distribution.Combustion experiment of a sludge was carried out at residence time 0.8 seconds, 7% oxygen concentration and the combustion temperatures of 900〜1500℃ Above the combustion temperature of 1300℃ the minerals which were included in a char particle cohered, combined and then melted during combustion. As the result, mineral particle size distribution increased with the temperature. Chemical composition of the mineral particles was analyzed by CCSEM and ICP. The elements such as Zn and P were volatilized from 1300℃. The solid solution phase such as Si-Al-Ca-Fe-P-Mg-O and Si-Al-Ca-Fe-P-Zn-O,quartz,CaAl-Sdicate, and apatite were identified in the molten minerals.

在这项研究中，我们开发了计算机控制扫描电子显微镜（CCSEM）的污泥炭测量技术，成功地收集了炭中无机颗粒的成分和粒径之间的数据。项目期间进行了以下研究：1）粒径分布验证及EDS分析2）污泥燃烧实验及污泥及其相关CCSEM分析。发现SEM图像的亮度分布影响粒度分布和化学成分分析的精度，通过数据的存储，可以找到亮度分布的最佳值。在100℃下进行了污泥的燃烧实验。停留时间0.8秒，氧气浓度7%，燃烧温度900〜1500℃ 燃烧温度1300℃以上，炭颗粒中所含的矿物质凝聚、结合，然后结果表明，随着温度的升高，矿物颗粒的化学成分有所增加，其中Zn、P等元素从1300℃开始挥发出固溶相。熔融矿物中鉴定出-Al-Ca-Fe-P-Mg-O和Si-Al-Ca-Fe-P-Zn-O、石英、CaAl-Sdicate和磷灰石。