基于老化降质的自然循环蒸汽发生器改进设计研究

Study on Design Improvements of Recirculation SG Based on Ageing Degradations

基于自然循环蒸汽发生器传热管的各种老化降质机理,对蒸汽发生器的改进设计进行了分析研究。研究结果表明,通过选择I-690TT作为传热管材料、加装排污装置、采用三叶或四叶梅花孔型管束支承板、在U型弯头区加装V型防振条结构以及给水采用全挥发处理等措施,可有效避免或缓解自然循环蒸汽发生器常见的各种老化降质。

Design improvements of recirculation SG is discussed based on different ageing degradation mechanisms around the heat transfer tube. The results indicate that the design improvement measurements, such as taking I-690 TT as the heat transfer tube materials, installing the blow down components, supporting the plate with broached quatrefoil or broached trefoil structures, installing V type anti vibration bar at U bend, and conducting all volatile treatment for feed water, can effectively avoid or mitigate the general ageing degradations for the recirculation SG.