稀土掺杂Mn-Zn-O固溶体制备、改性并在循环流化床锅炉燃烧中降磨损作用机理研究

项目名称： 稀土掺杂Mn-Zn-O固溶体制备、改性并在循环流化床锅炉燃烧中降磨损作用机理研究

项目编号： No.51466013

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 能源与动力工程

项目作者： 薛守洪

作者单位： 内蒙古科技大学

项目金额： 50万元

中文摘要： 本项目基于内蒙古地区循环流化床燃煤发电锅炉运行中受热面管材磨损严重导致爆管停机重大生产难题，在前期工作基础上制备稀土掺杂Mn-Zn-O固溶体并改性处理，进而在循环流化床锅炉模拟燃烧过程中控制煤灰固熔体结构生成并促使其形貌从不规则状向球形、椭球形转变，从而降低受热面管材磨损减少爆管停机事故，从根本上解决循环流化床锅炉受热面磨损爆管难题。具体研究内容包括：①制备不同组分RxOy(CeO2,La2O3)掺杂MnO2-ZnO(或MnO2-Fe2O3,MnO2-CuO,ZnO-CuO等)固溶体结构并改性处理，进行理化性能测试分析。②混合固溶体、原煤、脱硫剂石灰石粉开展模拟燃烧试验并测试煤灰结构及脱硫效率，分析燃烧过程中煤灰固熔体结构形貌及生成机理。③建立稀土掺杂Mn-Zn-O固溶体组分构成、改性工艺及煤灰形貌改变之间的理论模型，实现循环流化床锅炉燃烧煤灰形貌改变可控性，为工业化应用奠定基础。

中文关键词： 异相成核；固溶体；掺杂；改性；煤燃烧

英文摘要： The pipe bursting and boiler closing down which were caused by pipe wearing in the heating surface had been seriously affected the operation of coal-fired circulating fluidized bed (CFB) boiler in Innermongolia area. Based on the preceding work, RE-doped Mn-Zn-O solid solution would be prepared and modified in this project. Then the melt structure of coal ash in the simulating combustion of CFB were controlled and its pattern were changed from irregularity to spheric or ellipsoidal shape in order to reduce the pipe wearing in heating surface. This project include three parts. Firstly, the RxOy (CeO2, La2O3) doped MnO2-ZnO(or MnO2-Fe2O3, MnO2-CuO, ZnO-CuO) were prepared and modified. Their physicochemical properties were characterized. Secondly, the solid solution, raw coal and limestone flour were mixed and combusted in the simulating operation mode of CFB. The melt structure of coal ash and desulphurizing efficiency were characterized. The mechanics of melt structure of coal ash and its pattern were also analysed. Thirdly, the theory model of the component and stucture of RE-doped Mn-Zn-O solid solution, the modified technology and the patterns of coal ash would be builted. According to this model, the patterns of coal ash were disigned and controlled in the combustion of CFB. The research findings of this project would be applied in the large-scale coal-fired CFB boiler.

英文关键词： Heterogeneous nucleation;solid solution;doped;modified;coal combustion