屏式过热器出口集箱热电偶套管断裂原因分析  

CAUSE ANALYSIS OF FRACTURE OCCURRED ON THERMOWELL TO OUTLET HEADER OF THE PLATEN SUPERHEATER

作　　者：靳峰[1] 宋利[1] 张武能[1] 王锐[1] 

机构地区：[1]河南电力试验研究院,河南郑州450052

出　　处：《热力发电》2010年第4期100-101,103,共3页Thermal Power Generation

摘　　要：对某发电公司2号炉屏式过热器(屏过)出口集箱热电偶套管断裂原因进行了分析,结果表明热电偶套管的不合理结构加剧了热电偶套管断裂部位温度的升高和在交变应力下的振动使材料组织的快速老化以及焊接引起的σ相的存在共同导致了热电偶套管断裂。对此,建议在热电偶套管内壁加工内螺纹,使其结构更加稳定可靠,以避免同类事故发生。The causes of fracture on thermowell to outlet header for boiler no. 2 in one power generation company have been analysed, results show that the causes leading to fracture are as follows：unreasonable structure of the thermowell has intensified the temperature rise and vibration under cyclic stress at location of fracture appeared on the thermowell, the existence of σ - phase due to rapid ageing of material texture and welding leads to fracture of the thermowell. For this,it is recommended to fabricate intermal thread on inner wall of the thermowell,making its structure to be more stable and reliable,to avoid occurrence of similar accidents.

关 键 词：锅炉 屏式过热器 热电偶套管 断裂 结构 交变应力 Σ相 

分 类 号：TK223.32[动力工程及工程热物理—动力机械及工程]