锅炉高温过热器爆管原因分析  

Cause Analysis and Countermeasures of Tube-burst on High-temperature Superheater

作　　者：王甲安 郭延军 何桂宽 奚杰峰 

机构地区：[1]华电电力科学研究院,浙江杭州310030

出　　处：《发电与空调》2012年第4期31-33,共3页

摘　　要：某电厂高温过热器在运行期间发生爆管事故,爆口具有短时超温和长时超温特征。通过对爆管管样及相邻对比管样进行宏观检查、化学成分、金相及力学性能等分析,确定此次爆管是由于锅炉运行时间较长,管子长期在高温下服役,金相组织慢慢出现碳化物析出等老化现象,导致材料本身的性能下降,加之管子内部存有异物,造成管子介质流量减小及管子壁温上升,使管子在高温下的环向应力超过其材料本身强度而发生短时超温爆管。The accident of tube cracking on high-temprature superheater was occurred during running, and the chink had features of overtemperamre in short time and in long time. Through macroscopic examination, chemical composition analysis, metallographic examination and tensile test etc. , it shows that the main cause leading to tube-burst is the carbide precipitation aging because of the tube long-term service at over temperature condition, which leads to the performance of the material declined slightly. Then the blockage of foreign objects in the tube, which reduce the stream flow and result in lo- cal over-temperature onto the tube, making the cooling effect of steam to be reduced. Thereby, the accident of tube cracking was OCCUlTed.

关 键 词：过热器管 长时运行 短时超温 爆管 

分 类 号：TM621.2[电气工程—电力系统及自动化]