超超临界垂直管圈直流炉水冷壁节流孔圈垢物聚结原因分析及预防  

Analysis and prevention of sulfate scale on throttle orifices for water walls of USC vertical tube coil once-through boilers

作　　者：沈琦[1] 刘鸿国[1] 杨菁[2] 

机构地区：[1]华能玉环电厂,浙江玉环317604 [2]华东电力试验研究院有限公司,上海200437

出　　处：《华东电力》2009年第5期877-879,共3页East China Electric Power

摘　　要：介绍了垂直管圈直流炉结构特点及节流孔板垢物聚结的情况。通过垢物宏观检查、能谱分析、SEM微观形貌分析、炉水品质测量等试验和节流孔板设计结构、水动力分析,结果表明:垢物的主要成分为Fe3O4及少量Fe2O3,汽水品质不良、孔板结构形状、运行控制是产生节流孔板垢物的主要原因,联箱检修残留粉状碎屑加剧了垢物的聚结长大,导致了锅炉水冷壁超温过热爆管。提出了控制和减少垢物聚结的技术措施,为其他类似结构的超超临界机组或其他亚临界、超临界机组提供借鉴。The structure features of the vertical tube coil once-through boiler and the sulfate scale coalescing on its throttle orifices were presented. Through macroscopic test of the sulfate scale, energy spectrum analysis, SEM micro- scopic analysis of surface morphology, oxygen dissolution measurement of the boiler water, and the structural and hy- drodynamic analysis of the orifice plate, it was concluded that the main component of the sulfate scale was Fe304 mixed with some Fe203. The low quality steam-water, the construction shape, and the operational and control modes of the orifice plate were supposed to be the main causes for scaling on the orifice plate. The situation was worsened by powdery leftovers of header maintenance, which led to tube explosion of the water wall due to excessive temperature. Technical measures to control and reduce the sulfate scale coalescing were proposed.

关 键 词：垂直管圈直流炉 节流孔圈 垢物分析 结垢原因 预控措施 

分 类 号：TK223.3[动力工程及工程热物理—动力机械及工程]