NUCLEAR TECHNIQUES, Volume. 47, Issue 9, 090602(2024)
Development and validation of a thermal-hydraulic analysis code for dual cooled assemblies in molten salt reactors
Figures & Tables(19)
Fig. 1. Hollow hexagonal assembly (a) and dual cooled assembly (b)
Fig. 2. Actual model (a) and equivalent model (b) of the dual cooled assembly
Fig. 3. Axial normalized power distribution of fuel salt and graphite
Fig. 4. Schematic of heat transfer in a dual cooled component (a) Dual cooling, (b) External channel fuel salt heating graphite, (c) Inner channel fuel salt heating graphite (color online)
Fig. 8. Molten salt temperature distribution of the internal and external channel
Fig. 9. Curves of maximum outlet temperature of fuel salt varying with the level of various factors
Fig. 10. (a) Temperature distribution at the hottest section of graphite, (b) graphite normalized radial temperature distribution of the CFD model
Fig. 11. Graphite normalized radial temperature distribution on the hottest section
Fig. 12. Maximum temperature of graphite varying with the level of each factor
Fig. 13. (a) Molten salt temperature distribution, (b) graphite normalized radial temperature distribution
Table 1. Orthogonal design of single component parameters
View tableView in ArticleTable 1. Orthogonal design of single component parameters
工况
Case
A组件对边距
Substacne of component / cm
B熔盐体积占比
Fuel salt volume fraction
C外通道熔盐体积占比
External fuel volume fraction
1 (A1B1C1) 1 (16 cm) 1 (14%) 1 (40%) 2 (A1B2C3) 1 (16 cm) 2 (16%) 3 (80%) 3 (A1B3C2) 1 (16 cm) 3 (18%) 2 (60%) 4 (A2B1C3) 2 (18 cm) 1 (14%) 3 (80%) 5 (A2B2C2) 2 (18 cm) 2 (16%) 2 (60%) 6 (A2B3C1) 2 (18 cm) 3 (18%) 1 (40%) 7 (A3B1C2) 3 (20 cm) 1 (14%) 2 (60%) 8 (A3B2C1) 3 (20 cm) 2 (16%) 1 (40%) 9 (A3B3C3) 3 (20 cm) 3 (18%) 3 (80%)
Table 2. Grid independence analysis
View tableView in ArticleTable 2. Grid independence analysis
CFD模型网格划分
Meshing scheme of CFD model
THDA-MSR轴向网格划分
Axial meshing scheme of THDA-MSR
方案
Scheme
网格量
Mesh number / W
石墨温度热点
Maximum temperature of
graphite / ℃
方案
Scheme
划分层数
Number of layers
石墨温度热点
Maximum temperature
of graphite / ℃
1 28 747.8 1 20 746.8 2 42 747.2 2 40 746.1 3 80 746.7 3 80 745.6 4 102 746.6 4 120 745.6
Table 3. Property parameters of the fuel salt and graphite
View tableView in ArticleTable 3. Property parameters of the fuel salt and graphite
参数
Parameters
燃料盐
Fuel salt
石墨
Graphite
类型Type LiF-BeF2-ZrF4-UF4-ThF4 IG-110 密度Density / kg·m-3 2 757.9-0.464 54×T(K) 1 783 比热容Specific heat / J·kg-1·K-1 2 386 1 700 热导率Heat conductivity / W·m-1·K-1 1.4 65 黏度Viscosity / kg·(m·s) -1 0.003 6 exp(7 043.24/(T(K)+273)) —
Table 4. Results of the flow distribution and pressure drop
View tableView in ArticleTable 4. Results of the flow distribution and pressure drop
工况
Case
THDA-MSR Fluent 内外通道流量分配比
Flow distribution ratio
压损
Pressure / Pa
内通道压损
Inner channel pressure / Pa
外通道压损
External channel pressure / Pa
1 (A1B1C1) 4.741 6 337 6 180(2.48%) 6 234(1.63%) 2 (A1B2C3) 1.298 8 928 8 556(4.16%) 8 988(-0.68%) 3 (A1B3C2) 0.296 7 072 6 879.6(2.72%) 7 101(-0.41%) 4 (A2B1C3) 4.741 9 000 8 641(3.98%) 9 075(-0.84%) 5 (A2B2C2) 1.298 6 801 6 689(1.64%) 6 748(0.78%) 6 (A2B3C1) 0.296 4 476 4 522(1.02%) 4 394(1.84%) 7 (A3B1C2) 4.741 6 735 6 602(1.97%) 6 768(0.49%) 8 (A3B2C1) 1.298 4 277 4 320(1.00%) 4 206(1.67%) 9 (A3B3C3) 0.296 5 807 5 683(2.13%) 5 928(-2.09%)
Table 5. Results of the maximum temperature of graphite
View tableView in ArticleTable 5. Results of the maximum temperature of graphite
工况
Case
THDA-MSR
/ ℃
Fluent
/ ℃
绝对偏差
Absolute deviation / ℃
相对偏差
Relative deviation / %
1 (A1B1C1) 745.6 746.7 -1.1 -0.15 2 (A1B2C3) 715.8 716.5 -0.7 -0.09 3 (A1B3C2) 720.0 720.5 -0.5 -0.07 4 (A2B1C3) 718.1 718.6 -0.5 -0.07 5 (A2B2C2) 723.3 723.9 -0.6 -0.08 6 (A2B3C1) 743.6 744.0 -0.4 -0.05 7 (A3B1C2) 726.2 726.6 -0.4 -0.06 8 (A3B2C1) 747.8 748.0 -0.2 -0.03 9 (A3B3C3) 732.6 733.2 -0.6 -0.09
Table 6. Structure parameter of the components
View tableView in ArticleTable 6. Structure parameter of the components
参数
Parameters
传统中心开孔组件
Hollow hexagonal assembly
新型双面冷却组件
Dual cooled assembly
组件对边距Substacne of component / cm 18 18 熔盐体积占比Fuel salt volume fraction 0.1 0.1 外通道熔盐体积占比External fuel volume fraction — 0.9 内通道直径Diameter of inner channel / mm 60 19 外通道宽度Width of external channel / mm — 8.3
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Siqin HU, Chong ZHOU, Guifeng ZHU, Yang ZOU, Xiaohan YU, Shuaiyu XUE. Development and validation of a thermal-hydraulic analysis code for dual cooled assemblies in molten salt reactors[J]. NUCLEAR TECHNIQUES, 2024, 47(9): 090602
Paper Information
Category: NUCLEAR ENERGY SCIENCE AND ENGINEERING
Received: Nov. 16, 2023
Accepted: --
Published Online: Nov. 13, 2024
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