蒸汽发生器支承板杂质沉积及堵塞数值模拟研究  

Numerical Simulation of Impurity Deposition and Blockage in Tube Support Plate of Steam Generator

作　　者：穆德芳 王明军[1,2] 田文喜[1,2] 秋穗正[1,2] 苏光辉[1,2] MU Defang;WANG Mingjun;TIAN Wenxi;QIU Suizheng;SU Guanghui(State Key Laboratory on Power Engineering and Multiphase Flow,Xi’an Jiaotong University,Xi’an 710049,China;School of Nuclear Science and Technology,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,陕西西安710049 [2]西安交通大学核科学与技术学院,陕西西安710049

出　　处：《原子能科学技术》2022年第11期2283-2290,共8页Atomic Energy Science and Technology

摘　　要：在蒸汽发生器长期运行的过程中,二次侧流体中的杂质会在蒸汽发生器内部发生沉积。其中,杂质在支承板上的沉积会造成支承板的堵塞。支承板堵塞会使蒸汽发生器内出现局部高速流动和横流,极易造成流致振动和传热管裂纹。为预测蒸汽发生器支承板局部沉积物分布,本研究建立了蒸汽发生器杂质迁移模型和支承板堵塞模型,并植入到西安交通大学核反应堆热工水力团队(NuTHeL)自主开发的蒸汽发生器三维热工水力程序STAF中,对含有固化和不含固化条件下支承板150 d沉积行为进行了预测,分析了固化效应对沉积物分布的影响规律。结果表明,支承板热侧上部沉积物较多,沸腾是导致局部沉积主要因素。与不考虑固化情况相比,考虑固化后沉积质量减少,且冷热两侧沉积质量差异明显减小。考虑固化后沉积物分布更靠近支承板两侧,与流速分布较为相似。本文研究成果可为核动力系统蒸汽发生器设计和运维提供参考,从而尽可能减小支承板堵塞所导致的有害后果。In the process of long-term operation of steam generators,although the secondary side of the water quality is strictly controlled,in the complex thermal hydraulic conditions,impurities will also accumulate in the steam generator.It mainly includes the deposition of the heat transfer tube and the blocking of the tube support plate.Among them,the deposition of impurities on the supporting plate will cause the blocking of the tube support plate.The blockage of the support plate may lead to local high-speed flow and cross flow in steam generators,which will cause flow-induced vibration and tube cracks in some situations.Therefore,it is necessary to study the deposition of the tube support plate.In order to predict the deposit distribution on the tube support plate of the steam generator,the impurity migration model and the tube support plate flow blockage model were added to the three-dimensional thermo-hydraulic code of the steam generator STAF developed by NuTHeL of Xi’an Jiaotong University.The accuracy of the code,which was based on a porous medium method and the drift flux model,has been fairly well verified.The deposition on the tube support plate with and without ageing for 150 days were predicted in the paper.Then the influence of ageing was studied.First of all,the results show that there are more deposits in the upper part of the hot side of the tube support plate,which suggests that boiling is the main factor leading to deposition.Compared with the situation without ageing,the mass of deposits after ageing is reduced,and the difference of the deposition mass between the hot and cold sides is also significantly reduced.In addition,ageing also has a certain effect on the distribution of deposits.After ageing,the distribution of deposits is closer to the two sides of the tube support plate,which is similar to the distribution of flow velocity.The reason for this phenomenon is that flash evaporation is more likely to occur where the flow rate is high,making the soluble precipitate and thus exacerbating the a

关 键 词：蒸汽发生器 多孔介质 杂质沉积 支承板堵塞 STAF 

分 类 号：TL331[核科学技术—核技术及应用]