摘要
某石油注汽锅炉在生产作业中发生水冷壁管线爆管泄漏。为查明水冷壁的泄漏原因,对泄漏管段进行了化学成分分析、力学性能测试、显微组织分析和扫描电镜及能谱分析。结果表明,泄漏管段向火面壁厚减薄严重,且存在内壁麻坑、微裂纹以及非金属夹杂物超标等原始制造缺陷;其内部高温汽水介质中含有微量的Cl^(-)、S^(2-),运行一段时间后,向火面缺陷部位优先发生腐蚀溶解而造成管壁不断减薄,最终,管子因剩余壁厚不能满足强度要求而发生爆管。
A water-wall tube of a steam injection boiler suddenly leaks in production. In order to find out the leakage cause, the leakage tube-section was tesetd by chemical composition analysis, mechanical properties testing, microstructure testing, SEM & EDS. The results show that the wall thickness of leakage tube-section severely reduces on the fire side, and there are original manufacturing defects such as pits, microcracks and non-metallic inclusions exceeding standards in the inner wall. The high temperature steam-water substance inside the leakage tube contains Cl-and S2-. After running for a period of time, the corrosion dissolution of the defect areas in tube fire-exposed surface occurs preferentially, resulting in continuous thinning of the tube wall, and finally the tube bursts due to the residual wall thickness dissatisfing the strengthen requirement.
作者
田晓
秦承鹏
徐慧
梁碧珂
商雪威
TIAN Xiao;QIN Chengpeng;XU Hui;LIANG Bike;SHANG Xuewei(Xi'an Thermal Power Research Institute,Xi'an 710051,China;Xi'an YiTong Thermal Technology Service Co.,Ltd.,Xi'an 710054,China)
出处
《热加工工艺》
北大核心
2021年第2期159-163,共5页
Hot Working Technology
基金
华能国际电力股份有限公司资助项目(TQ-18-HJK13)。
关键词
20G钢
壁厚减薄
内壁麻坑
非金属夹杂
制造缺陷
20G steel
wall thickness thinning
inner wall pit
non-metallic inclusion
manufacturing defects
