基于全隐算法的螺旋管蒸汽发生器瞬态分析程序开发及验证  

Development and verification of transient analysis code of helical coil steam generator of high-temperature gas-cooled reactor based on all-implicit algorithm

作　　者：刘伟 胡守印 续亮 汤霆辉 李雪琳 王朗 吴攀 单建强[2] LIU Wei;HU Shouyin;XU Liang;TANG Tinghui;LI Xuelin;WANG Lang;WU Pan;SHAN Jianqiang(Huaneng Nuclear Energy Technology Institute,China Huaneng Group Co.,Ltd.,Shanghai 200126,China;Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]华能核能技术研究院有限公司,上海200126 [2]西安交通大学,西安710049

出　　处：《核技术》2025年第4期172-181,共10页Nuclear Techniques

基　　金：华能集团总部科技项目"高温气冷堆燃煤替代示范工程方案设计"(No.HNKJ22-H07 HN-750)资助。

摘　　要：高温气冷堆螺旋管蒸汽发生器两侧的运行工质分别为氦气和水,两者物性差异大,瞬态响应时间不同,用传统半隐数值求解方法开发得到的热工安全程序往往会因为库朗特准则而降低时间步长,从而降低蒸汽发生器热工水力程序的计算效率。本文以高温气冷堆螺旋管蒸汽发生器为研究对象,以均相流水力学模型为基础,采用对流-扩散项全隐差分格式算法求解基本守恒方程,采用流热全耦合算法求解传热管的导热过程,开发了全新的高温气冷堆螺旋管蒸汽发生器瞬态分析程序NUSOL-HTGRSG。采用球床模块式高温气冷堆(High Temperature Reactor-Pebble bed Modules,HTR-PM)蒸汽发生器的设计工况和经过验证的螺旋管直流式蒸汽发生器热工水力分析程序NUSOL-SG的瞬态计算结果开展了稳瞬态的验证。稳态计算结果表明:一次侧、二次侧出口温度及两侧压降误差基本小于1%。瞬态计算结果表明:相同工况下,两个程序的瞬态响应结果的最大相对偏差为1.4%。验证结果表明:NUSOL-HTGRSG程序能够有效预测高温气冷堆中螺旋管蒸汽发生器在稳态工况下的运行参数,并且能以较大时间步长(5 s)准确预测其瞬态特性。[Background]The fluids on both sides of the helical coil steam generator of the high-temperature gas-cooled reactor(HTGR)are helium and water respectively,whose physical properties are quite different and the transient response time is different.Traditional semi-implicit finite difference scheme applied to thermal hydraulic analysis code can only apply small time steps due to Courant-Friedrichs-Lewy(CFL)condition,which will decrease the computation efficiency.[Purpose]This study aims to develop and verify a new transient analysis code using all implicit algorithm for the helical coil steam generator of the high-temperature gas-cooled reactor.[Methods]Firstly,based on homogeneous flow model,a fully implicit finite difference scheme for the convection and diffusion term combined with the full coupling solution algorithm of flow and heat for thermal conductivity process to develop a new transient analysis program,named NUSOL-HTGRSG,for the helical coil steam generators of HTGR.Then,verification of the code was conducted in the four aspects:the design condition of the HTR-PM steam generator used for steady-state calculation validation,the number of grids changed for spatial sensitivity analysis,the time step changed for time sensitivity analysis,and the transient calculation carried out under the same disturbance(the flow rate of the primary side of the steam generator reduced by 10%).and results were compared with that of NUSOL-SG calculation.[Results]Steady-state validation results show that the relative errors of outlet temperatures and pressure drops in the primary and secondary sides are generally within 1%.Transient validation results indicate that,under identical transient conditions,the maximum relative deviation between the transient responses of the two codes is 1.4%.[Conclusions]The validation results demonstrate that the NUSOL-HTGRSG code can effectively predict the operating parameters of the helical coil steam generator in HTGRs under steady-state conditions and accurately capture its transient characte

关 键 词：高温气冷堆 螺旋管式蒸汽发生器 瞬态特性分析 全隐算法 程序开发 

分 类 号：TL99[核科学技术—核技术及应用]