铅基反应堆主换热器结构优化及热工水力分析

摘要

T he primary heat exchanger is a key heat transfer component for lead‐based reactors , w hich directly affects the economy and security of the reactor .Here ,based on the model of heat exchanger of a lead‐based natural circulation reactor ,the influences of the tube length ,outer diameter ,wall thickness and tube pitch on the thermal‐hydraulic analyses were discussed . JF factor was used to evaluate the comprehensive performance of the heat exchanger ,on the basis of which ,the best structure parameter A1B2C1D2 was determined by using CR and SN factor . The results show that tube length makes a greatest contribution to comprehensive performance , and the influence of tube pitch is almost negligible .%主换热器是铅基反应堆的关键热传输部件，直接影响反应堆的经济性与安全性．以液态铅铋冷却自然循环反应堆的管壳式主换热器为研究对象，从换热管长度 L、外径 do 、壁厚c、管间距 P这4方面对换热器进行热工水力分析研究，并采用 JF因子对换热器的综合性能进行评价，在此基础上，采用贡献比CR及平均信噪比S N评价因子得到最优的结构参数组合A1B2C1D2．研究表明，管长 L对换热器性能影响最大，而管间距 P对换热器性能的影响几乎可以忽略．