超临界锅炉T91末级过热器管爆管原因分析及超温估算  

Tube-bursting Cause Analysis of T91 Finishing Superheater Tube in Supercritical Boiler and Estimation for Overheating

作　　者：郑坊平[1] 包文东 刘佳伟[1] 宋少平[1] 

机构地区：[1]西安热工研究院有限公司,陕西西安710032 [2]浙江浙能兰溪发电有限责任公司,浙江兰溪321100

出　　处：《铸造技术》2016年第12期2600-2603,共4页Foundry Technology

摘　　要：通过宏观检查、化学成分分析、金相检验、硬度试验、断口扫描电镜观察等方法及综合分析,对超临界锅炉T91末级过热器管爆管原因进行了分析,并对超温进行了估算。结果表明:爆管是长时过热导致的,超温期间平均壁温高达约663℃,超温同TP347H管内壁局部位置少量氧化皮剥落有关。By means of visual testing, chemical composition analysis, metallographic examination, hardness testing, SEM analysis etc, the tube-bursting cause of T91 finishing superheater in supercritical boiler was analyzed. The results show that the tube-bursting is due to long-time overheating, the average wall temperature is up to 663 ℃ during overheating, in connection with a little oxide skin peeling-off from the local position of TH347H tube.

关 键 词：T91钢 长时过热 超温估算 氧化皮剥落 

分 类 号：TM621.2[电气工程—电力系统及自动化]