锅炉高温受热面蒸汽侧氧化皮的形成及剥落机理研究进展  

Review on the Formation and Exfoliation Mechanism of Steam-side Oxidation Scale on the Boiler Tube with High Temperature

作　　者：杨景标 郑炯 李树学 李越胜 邱燕飞 

机构地区：[1]广东省特种设备检测院,广东广州510655

出　　处：《锅炉技术》2010年第6期44-50,共7页Boiler Technology

基　　金：广东省安全生产专项资金项目(2008-79-C)

摘　　要：综合分析了各种类型的锅炉耐热钢管蒸汽侧氧化皮的微观形貌、氧化皮的层结构和成分组成。锅炉耐热钢蒸汽侧所生成的氧化皮有双层和3层结构,双层和3层结构的氧化皮的剥落位置发生在不同的亚层。对锅炉管内壁氧化皮剥落部位进行氧化皮生长的跟踪研究,可以得到氧化皮进一步生长的规律。氧化皮各层氧化物与基体金属间由于线性热膨胀系数差异所产生的热应力是导致氧化皮产生开裂和剥落的最根本原因,防治氧化皮大面积剥落的措施主要是抑制氧化皮生长速率和减少热应力的大幅度变化。由于实验室的试验条件难以模拟实际锅炉的蒸汽参数和应力变化,开发实验条件接近实际锅炉的蒸汽氧化试验是研究新型耐热钢内壁氧化皮生长及剥落机理的发展方向。The microstructure and chemical composition of oxidation scale for several heatresistant boiler tubes were analyzed. The oxidation scale was formed by two layers or three layers where exfoliation occurs in different layer according to different layer development mechanism of the oxidation scale could be obtained by continuin of the location where oxidation scale exfoliation had occurred. Exfoliation was resulted from the excessive stress due to the thermal expansion coeffic between outer layer of original oxidation scale and the base metal. Suppressin rate by controlling the temperature level of the tubes and slowing down the s the tubes were the main countermeasures against massive exfoliation. Investigation on the formation and exfoliation of oxidation scale carried out using the experiments where the conditions were closer to the actual boiler was a practical means to eliminate the disadvantage that the steam parameters and stress conditions used in present were far from the operational conditions in boiler.

关 键 词：锅炉管 蒸汽氧化 氧化皮形成 氧化皮剥落 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]