矩形窄缝通道受热表面污垢沉积实验研究  

Experimental study of the fouling deposition on heating surface of narrow rectangular channel

作　　者：程成 段钟弟 许巍[2] 刘晓晶[2] 唐文勇[1] CHENG Cheng;DUAN Zhongdi;XU Wei;LIU Xiaojing;TANG Wenyong(School of Naval Architecture,Ocean&Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;School of Nuclear Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]上海交通大学核科学与工程学院,上海200240

出　　处：《核技术》2022年第1期63-70,共8页Nuclear Techniques

基　　金：国家自然科学基金(No.U20B2011)资助。

摘　　要：失水事故下堆芯余热排出时,板状燃料元件表面因冷却剂引入负溶解度盐杂质而发生污垢沉积,导致传热性能恶化甚至堵塞通道。为研究矩形窄缝通道内受热表面污垢沉积特性,设计搭建了一种采集矩形窄缝通道表面特定方位处污垢样品的实验装置,以碳酸钙作为可溶性杂质,对60 mm×2 mm截面的矩形窄缝通道受热面污垢沉积过程进行实验测试,观测通道不同位置、不同时间下污垢沉积的微观形貌特征,测量污垢厚度的分布特性,并探究污垢沉积对壁面传热的影响规律。结果表明:污垢形态随沉积时间增加而改变,不同位置处的沉积厚度差异显著,通道传热系数随时间先下降后趋于稳定,下降幅度为26.49%。[Background]When the reactor residual heat is removed under loss of coolant accident(LOCA),the negative solubility salt impurities enter the coolant,and the surface of the plate-type components is scaled,which seriously affects the heat transfer performance of the channel and even leads to channel blockage.[Purpose]This study aims to understand the fouling characteristics on the heating surface of the narrow rectangular channel.[Methods]An experimental set-up was designed and built to collect fouling samples at the specific locations of the heating surface.Using calcium carbonate as a soluble impurity,the fouling process of the heating surface of a narrow rectangular channel with a cross-section of 60 mm×2 mm was experimentally examined.The microscopic morphology characteristics of the fouling at different locations of the channel and at different times were observed.The distribution characteristics of fouling thickness were measured,and the effect of fouling on wall heat transfer was investigated.[Results&Conclusions]The fouling morphology changes with time,and the fouling thickness at different locations is significantly different.The heat transfer coefficient of the channel first decreases and then tends to be stable with a decrease of 26.49%.

关 键 词：失水事故 矩形窄缝通道 污垢沉积 微观形貌 传热 

分 类 号：TL375.6[核科学技术—核技术及应用]