铅铋回路自然循环瞬态特性与腐蚀沉积研究
Development of an analytical program for natural circulation and corrosion precipitation in a LBE flow loop
李辉 1谢宛均 1朱玉琦 1吴浩 1吕海财 1刘芳 1牛风雷1
作者信息
- 1. 华北电力大学 核科学与工程学院, 北京 102206
- 折叠
摘要
为了解决液态铅铋回路在自然循环状态下腐蚀沉积对堆内结构材料的影响问题,本文开展了铅铋回路自然循环瞬态热工水力行为分析与溶解腐蚀沉积研究.通过对铅铋实验回路进行数学建模,开发了适用于瞬态自然循环的热工水力程序和腐蚀沉积程序.进行了瞬态启动、功率阶跃等典型工况下的瞬态热工水力行为分析,以及在无氧、氧控状态下的回路腐蚀沉积分布研究.结果表明:在瞬态启动过程中,铅铋回路温度波动较大,功率阶跃与入口温度增加均会导致自然循环流量的增加;铅铋回路自然循环运行且无氧控时腐蚀非常严重,在引入氧控后(c0 =1×10-8),最大腐蚀速率仅为无氧控时的 1/1 000,并且加热功率的提高会导致回路的腐蚀沉积速率增加,无氧和氧控状态下结果一致.本文为铅铋回路安全稳定运行提供参考.
Abstract
To address the issue of the influence of corrosion precipitation on the structural materials of the reactor in the liquid lead-bismuth circuit under natural circulation,the transient thermohydraulic behavior of the lead-bismuth circuit was analyzed under natural circulation and dissolved corrosion precipitation conditions.Through mathemati-cal modeling of the universal lead(Pb)bismuth(Bi)eutectic advanced test loop,the thermohydraulic and corro-sion deposition programs applicable to transient natural circulation were developed.The transient thermohydraulic behavior under typical operating conditions,such as transient start-up and step power change,and the corrosion precipitation distribution of the loop under oxygen-free and oxygen-controlled conditions are discussed.The results show that the temperature of the lead-bismuth circuit considerably fluctuates during transient start-up,and the in-crease in step power change and inlet temperature increases the flow rate of natural circulation.The corrosion of the lead-bismuth circuit is severe under natural circulation conditions without oxygen control.After introducing oxygen control(c0 = 1×10-8),the maximum corrosion rate was only 1/1 000 that of the case without oxygen control,and the increase in heating power increased the corrosion precipitation rate of the circuit.The results were similar in the oxygen-free and oxygen-controlled states.
关键词
铅铋合金/自然循环/隐式离散/瞬态启动/功率阶跃/溶解腐蚀模型/回路沉积/氧浓度Key words
lead-bismuth eutectic/natural circulation/implicit discrete/transient initiation/power step/dissolu-tion corrosion model/circuit deposition/oxygen concentration引用本文复制引用
基金项目
国家重点研发计划(2022YFB1902503)
国家自然科学基金(12027813)
国家自然科学基金(12105101)
出版年
2023
国家科技期刊平台
NSTL
维普
万方数据