373 MW液态燃料熔盐堆流量分配设计的优化研究

doi:10.11889/j.0253-3219.2019.hjs.42.070605

Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (7): 0-070605-10.doi: 10.11889/j.0253-3219.2019.hjs.42.070605

• NUCLEAR ENERGY SCIENCE AND ENGINEERING •

The optimization of flow rate distribution design of 373 MW molten salt reactor-liquid fuel

Qingyuan LI^1,²,Bo XU¹,Chong ZHOU¹,Yang ZOU¹(),Hongjie XU¹

1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2018-11-19 Revised:2019-03-25 Online:2019-07-10 Published:2019-07-16
Contact: Yang ZOU E-mail:Zouyang@sinap.ac.cn
About author:LI Qingyuan, male, born in 1992, graduated from University of Science and Technology of China in 2015, master student, focusing on thermal hydraulics of the MSR with liquid fuel
Supported by:
Supported by Shanghai Youth Science and Technology Talent Sailing Project(No.17YF1423900)

Abstract

Abstract: Background

Flow rate distribution design is one of the main contents of the thermal hydraulics study of molten salt reactor, because the flow rate distribution among all salt channels directly determines the location and peak value of local hotspots, which seriously affects the safety and reliability of the reactor operation.

Purpose

This study aims to improve the uniformity of mass flow rate distribution among salt channels of 373 MW molten salt reactor named TMSR-LF2 (Thorium Based Molten Salt Reactor - Liquid Fuel).

Method

First of all, the computational fluid dynamics program Fluent 15.0 was employ to is numerically simulate core flow field. Then the uniformity of structure optimization of upper plenum and lower plenum from several thermal-hydraulics characteristics were concluded according to the simulation output. Finally, several step-by-step improvement schemes were proposed.

Result

The schemes of inserting the cylindrical baffle plate can effectively suppress the eddy within the lower plenum and eliminate the radial inhomogeneity of the flow rate. Increasing the height of the upper plenum can balance the pressure drop of inner and outer channels on the radial direction to improve the flow rate uniformity. Reducing the radius of the inner channels on the metal support plate will bring about a platform area of flow rate among inner salt channels and the overall trend will be more gentle.

Conclusion

The modification results showed that the improvement methods mentioned above has important reference value for the further optimization design of MSR-LF.

Key words: MSR-LF, Flow rate distribution, Structure optimization, Computational fluid dynamics (CFD)

CLC Number:

Qingyuan LI,Bo XU,Chong ZHOU,Yang ZOU,Hongjie XU. The optimization of flow rate distribution design of 373 MW molten salt reactor-liquid fuel[J].Nuclear Techniques, 2019, 42(7): 0-070605-10.

Figures/Tables 22

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References 16

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设计总参数 Design parameter	值 Value
电功率 Electric power / MW	168
热功率 Thermal power / MW	373
功率密度 Power density / MW·m^-3	5.6
进/出口温度 Inlet / outlet temperature / ℃	600/700
熔盐通道个数 Number of salt channels	447
活性区直径/高度 Diameter / height of core zone / m	4.4/5
侧反射层厚度 Thickness of graphite reflective layer / m	0.3
燃料盐（初始/满装） Fuel salt (initial/full load)	LiF-BeF₂-UF₄-ThF₄ [70:18:1:6] [70:18:5:7]

方案编号 Number	网格数量 Mesh number
1	437
2	1 120
3	1 750
4	2 736
5	3 876
6	4 920
7	7 740
8	13 776

组成部分 Component	网格数量 Mesh number	等尺寸偏斜率分布 Percentage of mesh of corresponding equisize skew / %
组成部分 Component	网格数量 Mesh number	0~0.3	0.3~0.6	0.6~1.0
进口管Inlet pipe	20 889	91.00	9.00	0
下腔室Lower plenum	1 301 820	90.83	9.17	0
熔盐通道Salt channel	366 740	75.49	24.51	0
堆芯石墨组件Graphite component	3 474 996	91.75	8.25	0
侧反射层Graphite reflective layer	264 040	100	0	0
上腔室Upper plenum	1 743 141	89.32	10.68	0
出口管Outlet pipe	34 182	85.93	14.07	0

R / cm	Z / cm
R / cm	7	10	13	15
220	14.89	13.27	13.44	14.14
230	14.50	12.61	12.86	13.32
240	13.97	12.36	12.46	13.23

R / cm	Z / cm
R / cm	7	10	13	15
220	0.33	0.28	0.29	0.32
230	0.32	0.27	0.27	0.30
240	0.30	0.25	0.26	0.29

The optimization of flow rate distribution design of 373 MW molten salt reactor-liquid fuel

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方案编号 Number	流量分配系数偏差分析 Flow distribution coefficient deviation analysis		质量流量标准差 Standard deviation / kg·s^-1
方案编号 Number	最大偏差位置Position of maximun	值Value / %	质量流量标准差 Standard deviation / kg·s^-1
0	第2排通道出口贴壁处 Exit of Row 2 passage adhering to wall	82.61	1.04
1	第3排通道出口贴壁处Exit of Row 3 passage adhering to wall	12.36	0.25
2	第3排通道出口贴壁处Exit of Row 3 passage adhering to wall	9.90	0.21
3	第3排通道出口贴壁处Exit of Row 3 passage adhering to wall	5.87	0.16

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