Article(id=1236688423575147055, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1236688419800281460, articleNumber=null, orderNo=null, doi=10.19666/j.rlfd.202407186, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1721491200000, receivedDateStr=2024-07-21, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1772779096740, onlineDateStr=2026-03-06, pubDate=1740412800000, pubDateStr=2025-02-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1772779096740, onlineIssueDateStr=2026-03-06, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1772779096740, creator=13701087609, updateTime=1772779096740, updator=13701087609, issue=Issue{id=1236688419800281460, tenantId=1146029695717560320, journalId=1210938733613449225, year='2025', volume='54', issue='2', pageStart='1', pageEnd='160', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1772779095840, creator=13701087609, updateTime=1772779471840, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1236689996908909285, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1236688419800281460, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1236689996908909286, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1236688419800281460, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=109, endPage=117, ext={EN=ArticleExt(id=1236688423906497073, articleId=1236688423575147055, tenantId=1146029695717560320, journalId=1210938733613449225, language=EN, title=Flow and heat transfer characteristics of helical coiled tubes in steam generator of liquid metal reactor, columnId=1211002405299294959, journalTitle=Thermal Power Generation, columnName=Thermal energy science research, runingTitle=null, highlight=null, articleAbstract=

For helical coiled tube steam generator for liquid metal reactor, the working medium at the first side is liquid metal and that at the second side is water, and its thermal and hydraulic characteristics are significantly different from those of conventional pressurized water reactor natural circulation saturated steam generators. The helical coiled tube steam generator of liquid metal reactor is equivalent as flow network system and divided into flow circuits, pressure nodes, and other components. The mathematical model for calculating thermal hydraulic parameters such as pressure drop, flow rate and temperature, and mathematical model for calculating the metal wall temperature of tube bundles are established, based on the mass, momentum and energy conservations. Moreover, the profile of flow rate, pressure drop, working medium temperature, outlet steam temperature, wall temperature, vapor quality and heat transfer coefficient in helical coiled tubes are obtained through the direct solving of nonlinear equations composed of unknown flow rate and pressure nodes in the flow circuit. The flow and heat transfer characteristics of the helical coiled tubes in steam generator are obtained. Besides, one-dimensional system analysis and calculation programs are proposed other than RELAP5 and the thermal hydraulic calculation method of helical coiled tube steam generator has been improved.

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液态金属堆的螺旋管蒸汽发生器一次侧为液态金属工质、二次侧为水工质,其热工水力特性相比传统压水堆的自然循环饱和式蒸汽发生器有较大区别。提出将螺旋管蒸汽发生器等效为流动网络系统的方法,将螺旋管束分为流动回路、压力节点等元件;基于质量守恒、动量守恒、能量守恒等方程,建立了计算蒸汽发生器螺旋管回路的压降、流量和温度等热工水力参数的数学模型和管束金属壁温计算的数学模型;通过对流动回路未知流量、压力节点组成的非线性方程组进行直接求解,最终得到了螺旋管束内流量分配、压降、工质温度变化、出口汽温分布、壁温分布、干度及换热系数等变化情况,获得了蒸汽发生器螺旋管束流动传热特性,开发了除RELAP5外的一维系统分析计算程序,并完善了液态金属堆螺旋管束蒸汽发生器热工水力计算分析手段。

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谢海燕(1992),女,硕士,主要研究方向为核动力装置系统设计,

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谢海燕(1992),女,硕士,主要研究方向为核动力装置系统设计,

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The Chemical Engineering Journal, 1968, 218: 113-119., articleTitle=Pressure drop and heat transfer in coils, refAbstract=null), Reference(id=1236688445419082043, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236688423575147055, doi=null, pmid=null, pmcid=null, year=2015, volume=52, issue=4, pageStart=20, pageEnd=24, url=null, language=null, rfNumber=[26], rfOrder=41, authorNames=毛宇飞, 齐伟, 刘庆君, journalName=化工设备与管道, refType=null, unstructuredReference=毛宇飞, 齐伟, 刘庆君. 螺旋管内单相湍流摩擦阻力计算方法新探[J]. 化工设备与管道, 2015, 52(4): 20-24., articleTitle=螺旋管内单相湍流摩擦阻力计算方法新探, refAbstract=null), Reference(id=1236688445477802301, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236688423575147055, doi=null, pmid=null, pmcid=null, year=2015, volume=52, issue=4, pageStart=20, pageEnd=24, url=null, language=null, rfNumber=[26], rfOrder=42, authorNames=MAO Yufei, QI Wei, LIU Qingjun, journalName=Process Equipment & Piping, refType=null, unstructuredReference=MAO Yufei QI Wei, LIU Qingjun. New method of calculating friction resistance of single phase turbulent flow in helical coils[J]. 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and heat flux density of the fifth layer helical coiled tubes, figureFileSmall=kQmF8HrUhogR1k9s8zsZqw==, figureFileBig=kEP4sRkxFVZ3e29rBIOnEw==, tableContent=null), ArticleFig(id=1236688437819002976, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236688423575147055, language=CN, label=图15, caption=第5层螺旋管干度、换热系数、热流密度分布, figureFileSmall=kQmF8HrUhogR1k9s8zsZqw==, figureFileBig=kEP4sRkxFVZ3e29rBIOnEw==, tableContent=null), ArticleFig(id=1236688437919666274, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236688423575147055, language=EN, label=Tab.1, caption=

Design parameters of IRIS steam generator

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项目数值
螺旋管数/根655
螺旋管内径/mm13.24
螺旋管外径/mm17.46
有效高度/m7.90
平均长度/m32.00
流量/(kg·s–1)62.50
二次侧入口温度/℃223.95
二次侧出口温度/℃317.00
二次侧入口压力/MPa6.096
二次侧出口压力/MPa5.800
), ArticleFig(id=1236688438016135273, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236688423575147055, language=CN, label=表1, caption=

IRIS蒸汽发生器设计参数

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项目数值
螺旋管数/根655
螺旋管内径/mm13.24
螺旋管外径/mm17.46
有效高度/m7.90
平均长度/m32.00
流量/(kg·s–1)62.50
二次侧入口温度/℃223.95
二次侧出口温度/℃317.00
二次侧入口压力/MPa6.096
二次侧出口压力/MPa5.800
), ArticleFig(id=1236688438125187180, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1236688423575147055, language=EN, label=Tab.2, caption=

Mass flow and mass flow rate of single pipe in each circuit

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回路号质量流量/(kg·s–1)质量流速/(kg·(m2·s)–1)
10.222 648980.916 2
20.217 250957.130 9
30.224 098987.303 8
40.220 067969.542 0
50.224 810990.438 7
60.221 920977.706 7
70.225 236992.315 0
80.222 664980.982 7
90.220 502971.461 4
100.223 285983.722 7
110.221 610976.341 0
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各回路单管质量流量和质量流速

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回路号质量流量/(kg·s–1)质量流速/(kg·(m2·s)–1)
10.222 648980.916 2
20.217 250957.130 9
30.224 098987.303 8
40.220 067969.542 0
50.224 810990.438 7
60.221 920977.706 7
70.225 236992.315 0
80.222 664980.982 7
90.220 502971.461 4
100.223 285983.722 7
110.221 610976.341 0
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液态金属堆蒸汽发生器螺旋管束流动传热特性研究
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谢海燕 , 聂鑫 , 赖建永 , 田雅婧
热力发电 | 热能科学研究 2025,54(2): 109-117
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热力发电 | 热能科学研究 2025, 54(2): 109-117
液态金属堆蒸汽发生器螺旋管束流动传热特性研究
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谢海燕 , 聂鑫, 赖建永, 田雅婧
作者信息
  • 中国核动力研究设计院核反应堆技术全国重点实验室,四川 成都 610213
  • 谢海燕(1992),女,硕士,主要研究方向为核动力装置系统设计,

Flow and heat transfer characteristics of helical coiled tubes in steam generator of liquid metal reactor
Haiyan XIE , Xin NIE, Jianyong LAI, Yajing TIAN
Affiliations
  • National Key Laboratory of Nuclear Reactor Technology, Nuclear Power Institute of China, Chengdu 610213, China
出版时间: 2025-02-25 doi: 10.19666/j.rlfd.202407186
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液态金属堆的螺旋管蒸汽发生器一次侧为液态金属工质、二次侧为水工质,其热工水力特性相比传统压水堆的自然循环饱和式蒸汽发生器有较大区别。提出将螺旋管蒸汽发生器等效为流动网络系统的方法,将螺旋管束分为流动回路、压力节点等元件;基于质量守恒、动量守恒、能量守恒等方程,建立了计算蒸汽发生器螺旋管回路的压降、流量和温度等热工水力参数的数学模型和管束金属壁温计算的数学模型;通过对流动回路未知流量、压力节点组成的非线性方程组进行直接求解,最终得到了螺旋管束内流量分配、压降、工质温度变化、出口汽温分布、壁温分布、干度及换热系数等变化情况,获得了蒸汽发生器螺旋管束流动传热特性,开发了除RELAP5外的一维系统分析计算程序,并完善了液态金属堆螺旋管束蒸汽发生器热工水力计算分析手段。

液态金属堆  /  蒸汽发生器  /  螺旋管束  /  流动网络  /  流动传热特性  /  热工水力

For helical coiled tube steam generator for liquid metal reactor, the working medium at the first side is liquid metal and that at the second side is water, and its thermal and hydraulic characteristics are significantly different from those of conventional pressurized water reactor natural circulation saturated steam generators. The helical coiled tube steam generator of liquid metal reactor is equivalent as flow network system and divided into flow circuits, pressure nodes, and other components. The mathematical model for calculating thermal hydraulic parameters such as pressure drop, flow rate and temperature, and mathematical model for calculating the metal wall temperature of tube bundles are established, based on the mass, momentum and energy conservations. Moreover, the profile of flow rate, pressure drop, working medium temperature, outlet steam temperature, wall temperature, vapor quality and heat transfer coefficient in helical coiled tubes are obtained through the direct solving of nonlinear equations composed of unknown flow rate and pressure nodes in the flow circuit. The flow and heat transfer characteristics of the helical coiled tubes in steam generator are obtained. Besides, one-dimensional system analysis and calculation programs are proposed other than RELAP5 and the thermal hydraulic calculation method of helical coiled tube steam generator has been improved.

liquid metal reactor  /  steam generator  /  helical coiled tubes  /  flow network  /  flow and heat transfer characteristics  /  thermal hydraulic
谢海燕, 聂鑫, 赖建永, 田雅婧. 液态金属堆蒸汽发生器螺旋管束流动传热特性研究. 热力发电, 2025 , 54 (2) : 109 -117 . DOI: 10.19666/j.rlfd.202407186
Haiyan XIE, Xin NIE, Jianyong LAI, Yajing TIAN. Flow and heat transfer characteristics of helical coiled tubes in steam generator of liquid metal reactor[J]. Thermal Power Generation, 2025 , 54 (2) : 109 -117 . DOI: 10.19666/j.rlfd.202407186
液态金属冷却核反应堆(液态金属堆)包括钠冷快堆、铅铋合金冷却快堆等,是具有较大发展潜力的第四代核能技术先进堆型。铅、铅铋、铅锂合金等铅基材料具有中子性能优良、高温、高效率、结构紧凑、安全性高等特点[1]。螺旋管具有空间利用率高、同空间传热面积更大的优点,比直管具有更高的传热系数与换热效率,同时重心低下、结构紧凑,适应性及可靠性更好,广泛应用于各种换热设备,目前已成为核反应堆蒸汽发生器和化工换热设备的主要型式[2]。液态金属堆如法国凤凰堆、日本280 MW钠冷快堆、德国钠冷快堆SNR-300[3]、欧洲开发的铅铋合金冷却快堆ELSY[4]、俄罗斯铅铋合金冷却快堆BREST[5]均采用了螺旋管蒸汽发生器。
用于液态金属堆的螺旋管蒸汽发生器具有一次侧液态金属工质、二次侧水工质、螺旋管结构、工质温度较高等特点,其热工水力特性相比传统压水堆的自然循环饱和式蒸汽发生器具有较大区别。国内有较多学者针对此类蒸汽发生器开展研究。赵孝等[6]针对一体化小型模块式反应堆设计了一种螺旋式蒸汽发生器,并分析了组件中单根螺旋管温度、换热系数及热流密度等沿管长的变化。黄晓津等[7]针对HTR-10螺旋管蒸汽发生器建立了实时动态模型。李晓伟等[8]针对高温气冷堆蒸汽发生器热工水力问题进行了阐述,并介绍了清华大学针对该堆型开发的各种程序。马腾跃等[9]通过缩尺模型冷态实验与数值建模研究了蒸汽发生器换热管流量分配问题,得出换热管存在较严重的流量分配不均的结论。杨宇鹏等[3]利用FLUENT对液态金属螺旋管蒸汽发生器流体耦合流动传热过程进行了数值模拟。刘佳伦等[10]基于漂移流模型对液态金属快堆螺旋管蒸汽发生器热工水力特性开展了分析。秦长平[11]、袁媛[12]、Hoffer[13]、Bayless[14]等人均采用软件RELAP5对螺旋管束进行建模,在确定横截面积、传热面积、水力直径等参数的情况下,将螺旋管束简化为一根倾斜的直管,未对螺旋管束的各单管流量分配等进行计算分析[15]
螺旋管蒸汽发生器螺旋管束内流量分配并不是完全均匀的,且目前公开发表的文献并未完整报道蒸汽发生器所有螺旋管内流量分布、工质温度分布、内壁温度分布、外壁温度分布、出口汽温分布等热工水力特性分析结果,同时对螺旋管内发生传热恶化时的壁温飞升现象也缺乏研究。本文提出了将螺旋管束结构划分为若干流动回路,并将流动回路沿工质流动方向划分为若干管段,在守恒方程和相关补充方程的基础上建立数学模型,通过迭代法进行求解,用Fortran编程计算得到了液态金属堆蒸汽发生器螺旋管束流动传热特性。
螺旋管蒸汽发生器HOTSG的一次侧为液态金属冷却剂,二次侧的工质为水,蒸汽发生器的入口处为过冷水,从蒸汽发生器底部进入蒸汽发生器内,在多根并行的螺旋管中自下而上流动,与一次侧的液态金属冷却剂逆流换热,在蒸汽发生器二次侧出口处被加热至过热蒸汽,进而引出至压力容器外部,推动下游汽轮机做功。
设计HOTSG单根换热管管长相同,有效的受热长度约26 m,但每层管的盘绕倾角不同,与水平方向的倾角平均为5.3°,换热管材料粗糙度0.001 5 mm。为准确计算蒸汽发生器HOTSG内的流动传热特性,将蒸汽发生器的物理结构通过流动网络法等效为相关的流动回路、压力节点等元件,再进行数学建模。
对螺旋管蒸汽发生器HOTSG结构进行建模。因螺旋管蒸汽发生器HOTSG每层的螺旋管倾角相同、受热相似,可将每层螺旋管束划分为同一个流动回路。螺旋管蒸汽发生器由11层的螺旋管构成,具体如图1所示,螺旋管蒸汽发生器共划分11个流动回路。
为准确计算压力、温度及焓值沿管长的变化特性,将每一个计算回路沿工质流动方向划分为若干个具有一定长度的换热管。管段中各个位置处的热负荷以及流动结构等参数完全相同。在每一个管段中,通过管段的进、出口工质参数,判断管段内的流动状态进行分类计算。图2为沿高度方向HOTSG换热管的热流密度分布。图3为流动回路管段划分示意,每个螺旋管回路共划分约70个管段。
图4为本文计算蒸汽发生器的流动网络流动回路、压力节点编号示意。
对蒸汽发生器各回路的流量及节点的压力等这些未知量进行假设,以列出回路、连接管和节点所遵循的质量守恒方程、动量守恒方程与能量守恒方程。对这些方程组成的封闭非线性方程组进行求解,即可得到各回路的流量分配和节点压力分布。
设回路1—11单管质量流量为Qi(i=1,2,…,11),回路管子根数为n(i),可建立压力平衡方程和流量平衡方程组成的非线性方程组。利用拟牛顿迭代法对由流动回路和压力节点所建立的非线性方程组进行迭代求解,便可得到整个螺旋管蒸汽发生器中所划分回路的流量大小以及压力节点的压力值。计算流程思路示意如图5所示。图中k为迭代次数,i为计算回路,j为回路的管段数,I为回路最大数,m为压力节点数编号,n为压力节点编号最大数,压力节点数的编号为回路最大数后的继续编号。εδ分别为压力平衡方程|fi|及流量平衡方程|fm|最大误差。
对于螺旋管束而言,由于处于相同的上、下联箱之间,故而其工作压力也相同。处于相同上、下联箱之间的第i根管子的压降Δpi即上、下联箱间压降与管内工质质量流量Qi之间存在一定关系,如式(1)所示:
Δpi=ϕi(Qi),i=1,2,,11
式中:ϕi为管子i内工质质量流量Qi与压降Δpi之间的函数关系。
螺旋管入口、螺旋管出口两压力节点间的压力平衡方程为:
0=pinp(12)Δp(i),i=1,2,,11
式中:pin为螺旋管入口压力,Pa;p(12)为螺旋管出口压力,Pa;Δp(i)为第i回路的总压降,是i回路的质量流量Qi的函数。
式(3)给出了螺旋管管束出口12号节点的质量守恒的方程。
0=QQi
式中:Q为给水总流量,kg/s。
式(1)、式(2)、式(3)可转换为:
{f(i)=Δpϕi(Qi)f(i+1)=Qi=111Qii=1211
即方程组
fm(Q1,Q2,...,Q11,Δp)=0m=1212
采用拟牛顿迭代法对上述非线性方程组进行求解,从而得到各回路的质量流量以及压力节点的压力值。
能量守恒方程用来计算回路各管段内的工质参数,每个回路管段的入口热力参数为上一管段的出口参数,受热边界条件为蒸汽发生器设计参数,管内工质参数调用水蒸气物性函数查询。可用能量守恒方程计算所划分回路在各划分管段的出口焓值,如下式所示:
hout=hin+qslw
式中:hin为螺旋管入口焓值,J/kg;q为热流密度,W/m2s为管子节距,m;w为单管质量流速,kg/s。
此外,根据传热学原理和文献[16],结合螺旋管几何结构、内壁换热系数、管子导热系数、管外流密度计算管壁金属温度。
流体在螺旋管内流动时的一个显著特点就是在垂直于主流方向的流动截面上产生了二次回流,这将引起管内换热加强,同时导致管道流动阻力增大。
换热方面,螺旋管内工质依次经过欠焓单相流动、两相流动及蒸干后两相流动、过热单相流动等状态,对应流动状态选择现有文献经验公式[10,17-21],其中欠焓单相流动和过热单相流动参考修正的D-B公式[20,22],两相流动采用Chen关系式[19],换热计算还包括临界干度判断准则及干涸后传热计算公式,蒸干后流动传热参考Miropolskiy关系式[17,20]
阻力计算包括摩擦阻力计算、重位压降、局部阻力,因加速压降占比非常小,忽略加速压降计算。单相流体及两相流体的阻力计算方法参考国内相关标准[23]。而在摩擦阻力计算方面,国内外学者对螺旋管内湍流摩擦阻力已进行了大量研究,相应提出了很多摩擦阻力系数的经验公式[17,24-26]。根据公式适用范围,结合蒸发器螺旋管束内流动特点,本文计算引入适用于螺旋管内流动的摩擦阻力系数[26](式(7)),该经验公式合理地考虑了螺旋管道表面粗糙度对摩擦阻力的影响,适用于螺旋管内整个湍流区(包括水力光滑区、粗糙过渡区和水力粗糙区)。
λ=0.11[Δd+87Re0.8(dD)0.4]0.25
式中:λ为螺旋管摩擦阻力系数;Δ为表面粗糙度,m;d为管子内径,m;Re为雷诺数;D为螺旋直径,m。
为验证计算模型的可靠性,以IRIS螺旋管式直流蒸汽发生器为参考对象,对比本文计算结果和公开文献的计算结果[18,20],IRIS蒸汽发生器设计参数见表1
计算螺旋管蒸汽发生器内螺旋管工质温度随管长的变化,并与公开文献计算数据对比,结果如图6所示。由图6可以发现,3种计算方法工质温度的变化趋势和数值基本一致,工质从过冷至两相区曲线吻合度高,但本文计算程序计算工质过热较为提前,此外本文计算方法考虑了螺旋管出口引出部分不受热,因此工质温度在出口段未变化。3种计算方法得到的管出口蒸汽均为过热蒸汽,与设计值误差为-0.99%,出口蒸汽温度与RELAP5和文献[18]计算结果误差分别为-0.46%、-1.63%。管路进、出口总压降计算值为0.34 MPa,设计值二次侧压差为0.3 MPa,本文压降计算模型偏保守,但在合理范围内。表明本文计算模型能够适用于螺旋管式蒸汽发生器的计算。
根据计算结果,包含进出口连接管在内的蒸汽发生器螺旋管束入口至螺旋管束出口的压降为0.595 MPa。
各回路单根螺旋管的压降如图7所示。因每根螺旋管长度一致,故每根管沿程摩擦阻力基本相同;因各层管子相对高度相近,重位压降差距不大;因每根管特别设计了节流元件,保证了各管局部阻力压降相近。总体来说,每根螺旋管总压降基本相同,局部阻力约68.90%,摩擦阻力约29.60%,重位压降约1.41%。
表2给出了计算得到的螺旋管蒸汽发生器各回路单管流量分配情况。
表2可以看出,各回路单管质量流量存在较小差别,除结构的流动阻力影响外,其主要原因是螺旋管纵向受热高度不同,螺旋管蒸汽发生器热负荷大小与流量分布呈负相关。总体而言,每层螺旋管因为总压降基本相同,所以流量分布偏差较小。各层螺旋管数量均不相同,管子数量从第1层至11层逐渐递增,根据计算的单管质量流量可以得到每层的质量流量,各层螺旋管质量流量分布如图8所示。由图8可以看出,流量从里层至外层逐渐增大。
图9给出了计算得到的螺旋管蒸汽发生器各层单管质量流速分布情况。每层换热管的内径结构均相同,单根管的质量流速与质量流量分布规律一致,最大的流量偏差为第2层单管,为-2.2%。因设计时单根管的长度均一致,第2层管倾角较大受热高度最大,因此受热最强,在并联管路的直流蒸汽发生器中流量和质量流速最小。
图10图11分别为螺旋管蒸汽发生器各回路出口工质焓值分布和温度分布。
可以看出,蒸汽发生器各回路的出口温度分布和焓值分布规律相同,流量较小回路的出口蒸汽温度值较高。第2回路(即第2层)出口汽温最高,为394.4 ℃;第7回路(即第7层)出口汽温最低,为370.3 ℃,最大汽温偏差为24.1 ℃。
图12示出了螺旋管蒸汽发生器第1回路(第1层)的工质温度、内壁温度、中间壁温、外壁温度沿蒸汽发生器高度方向的变化曲线。图13示出了第1层螺旋管干度、换热系数、热流密度沿蒸汽发生器高度方向的变化情况。
以第1回路为例,可以看出:工质刚开始处于单相区,因此工质温度随相对高度的增加而增加,壁温也随之升高;随后在相对高度1.278 m处工质进入两相区,工质温度几乎不变,随着换热系数增大,壁温减小;在相对高度1.930 m处管内发生蒸干传热恶化,换热系数大幅减小,壁温出现较大飞升,外壁温从348 ℃升高至442 ℃,对应临界干度为0.57;但蒸干发生后,随着高度增大,壁温再逐渐减小;在相对高度2.500 m左右处,工质达到过热状态,工质温度升高,管壁温度也随之升高,最高外壁温度为442 ℃,最高中间点温度为428 ℃;最后,由于螺旋管段出口处不受热,因此壁温减小,和工质温度相同。
图14示出了螺旋管蒸汽发生器第5回路(第5层)的工质温度、内壁温度、中间壁温、外壁温度沿蒸汽发生器高度方向的变化曲线。
图15示出了第5层螺旋管干度、换热系数、热流密度沿蒸汽发生器高度方向的变化情况。需要说明的是干度热力学定义为[0,1],文章计算时为了区分“过冷区”和“过热区”工质,图示干度有小于0或大于1的数。
对于第5回路,在相对高度1.230 m处工质进入两相区,工质温度几乎不变,随着换热系数增大,壁温减小;在相对高度1.847 m处管内发生蒸干传热恶化,换热系数急剧减小,壁温大幅飞升,外壁温从348 ℃升高至443 ℃,对应临界干度为0.56;蒸干发生后,随着高度增大,壁温再逐渐减小;在相对高度约2.380 m处,工质达到过热状态,工质温度升高,管壁温度也随之升高,最高外壁温度为443 ℃;由于螺旋管段出口处不受热,因此壁温减小,和工质温度相同。
本文将液态金属堆螺旋管蒸汽发生器等效为流动网络系统,并建立计算模型,将每层螺旋管束划分为1个回路,基于质量守恒、动量守恒和能量守恒方程建立数学模型,并通过对非线性方程组的求解得到螺旋管束的流量、压降、工质温度、出口汽温、壁温、干度、换热系数等分布情况,通过公开文献计算案例验证了计算模型的适用性,并得到如下结论。
1)螺旋管蒸汽发生器每根螺旋管总压降基本相同,局部阻力约68.90%,摩擦阻力约29.60%,重位压降约1.41%。
2)螺旋管蒸汽发生器每根螺旋管因总压降基本相等,所以流量分布偏差较小。各管质量流量的差别是因为管子纵向受热高度的不同,热负荷大小与流量分布呈现负相关。
3)蒸汽发生器各层螺旋管的出口温度分布和焓值分布规律相同,流量较小的层数相应出口蒸汽温度值较高。
4)计算得到各层螺旋管的热工水力特性参数分布情况,第1层螺旋管在1.930 m处管内工质发生蒸干传热恶化,换热系数大幅减小,外壁温从348 ℃升高至442 ℃,对应临界干度为0.57。第1层螺旋管最高外壁温度为442 ℃,最高中间点温度为428 ℃。
5)该计算模型能够揭示液态金属堆螺旋管蒸汽发生器所有螺旋管的压力、流量分布情况,并可计算得到各层螺旋管在不同相对高度的工质温度、壁面温度、干度以及换热系数情况,获得蒸汽发生器螺旋管束流动传热特性。此研究完善了螺旋管蒸汽发生器热工水力分析计算,具有一定的参考意义。
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doi: 10.19666/j.rlfd.202407186
  • 接收时间:2024-07-21
  • 首发时间:2026-03-06
  • 出版时间:2025-02-25
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    中国核动力研究设计院核反应堆技术全国重点实验室,四川 成都 610213
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