Flow and heat transfer characteristics of helical coiled tubes in steam generator of liquid metal reactor

XIE Haiyan; NIE Xin; LAI Jianyong; TIAN Yajing

doi:10.19666/j.rlfd.202407186

English

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Flow and heat transfer characteristics of helical coiled tubes in steam generator of liquid metal reactor

Thermal Power Generation Vol. 54, Issue 2, Pages: 109-117(2025)

更新时间：2025-09-28

- Flow and heat transfer characteristics of helical coiled tubes in steam generator of liquid metal reactor
- 作者机构：
  
  中国核动力研究设计院核反应堆技术全国重点实验室
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202407186
  CLC： TL353.13
- Published：2025
- 稿件说明：
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XIE Haiyan, NIE Xin, LAI Jianyong, et al. 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：

XIE Haiyan, NIE Xin, LAI Jianyong, et al. 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.

摘要

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。

Abstract

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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