摘要
详细阐述了对1 000 MW超超临界燃煤发电机组高压旁路管道(简称高旁)主阀阀座的修复过程,通过执行严格的修复工作程序,采用热丝氩弧焊和镍基高温合金材料过渡等工艺方法,并利用六轴联动焊接机械手臂的柔性,克服了高旁主阀高温和主阀阀腔狭小等恶劣环境条件进行堆焊的困难,确保堆焊层质量能够满足阀座密封面的各项性能要求。同时,彻底消除了阀体材料为SA182-F91/F92的主蒸汽高旁阀门阀座的开裂和吹损等缺陷,保证了发电机组的设备可靠性和经济性,亦为解决超超临界燃煤发电机组的高温高压蒸汽阀门内漏问题提供了思路和方法。
In this paper, the restoration of main valve seat of HP bypass pipes in a 1 000-MW coal-fired USC power unit is introduced in detail. Through implementing strict restoration procedure and adopting hot-wire arc welding and nickel-base superalloy as transition material, as well as the flexible robotic welding arms with six-aixs simultaneous motion the problem of surfacing in tight spaces, such as the main valve chamber of HP bypass pipes under high-temperature harsh environmental conditions is tackled, which ensures the quality of surfacing layer to meet the performance requirements of valve seat sealing surface. Meanwhile, the defects such as cracking and blowing loss on the steam valve seat of HP bypass pipes which is built with SA184-F91/F92 are solved completely. Therefore, the reliability and economic efficiency of the power unit are guaranteed. This restoration can provide ideas and methods for solving steam valve leakage under high steam temperature and pressure in coal-fired USC power units.
出处
《中国电力》
CSCD
北大核心
2015年第7期68-71,共4页
Electric Power
关键词
超超临界机组
高压旁路
主阀门
阀座
堆焊
USC power unit
HP bypass pipe
main valve
valve seat
surfacing
作者简介
唐彬（1973-），男，上海奉贤人，高级技师，从事燃煤热电厂金属监督工作。E—mail：tangb@wj．shanghaipower．com
