摘要
田湾核电站1号机组除氧系统某节流孔板后方的直管段在一个换料周期内壁厚由6.6 mm减薄至2.5 mm,极易造成管道泄漏,为机组安全运行带来潜在的隐患。本文就除氧系统孔板后管道减薄磨损位置、汽蚀原理进行分析,对除氧系统孔板设计存在的缺陷、采用多级节流孔板代替单级节流孔板优势及管道减薄改进措施进行综合论述。通过改造,满足了除氧系统给水管线的运行要求,且有效降低了管道腐蚀速率。
The pipe-wall thickness in a straight section, which is located behind a restriction orifice in deaerating system in 1# unit of Tianwan Nuclear Power Plant, reduced from 6.6 mm to 2.5 mm in a refueling cycle. It is prone to cause leakages that lead to a potential safety hazard for operation. This paper analyzes the location of abrasion and the mechanism of cavitation happened in this thickness-reducing pipe behind the restriction orifice, and comprehensively discusses the design deficiencies in the orifices of the deaerating system and the advantages of replacing the single-stage orifice by the multistage orifices. After the improvement, the operation requirements of water-supply pipelines in the deaerating system can be satisfied, and the erosion rate of pipelines can be effectively reduced.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2015年第S1期194-197,共4页
Nuclear Power Engineering
关键词
节流孔板
管道减薄
汽蚀
多级孔板
Restriction orifice,Pipe-wall thinning,Cavitation,Multistage orifices
