NUCLEAR TECHNIQUES, Volume. 48, Issue 7, 070031(2025)
Numerical simulation analysis and experimental validation for the reactor cavity of molten salt reactor
Figures & Tables(20)
Fig. 2. The diagram of heat transfer process for the lower reactor cavity
Fig. 3. Diagram of geometric model of the reactor cavity of simulated reactor (color online)(a) Upper reactor cavity, (b) Lower reactor cavity
Fig. 4. Module division of the upper reactor cavity (color online)
Fig. 5. Partial mesh form for the upper and lower reactor cavity (color online)(a) Upper reactor cavity, (b) Lower reactor cavity
Fig. 6. The temperature contours of the air in the upper cavity under three calculated conditions (color online)(a) 510 ℃, (b) 550 ℃, (c) 600 ℃
Fig. 7. Temperature distribution of the designated air zone in the upper cavity (color online)(a) Radial air temperature at a height of 5 m, (b) Axial air temperature at a distance of 1 m from the center of the simulated model
Fig. 8. Simulation results for the upper silo of simulated reactor (color online) (a) The temperature contour of the lower reactor silo, (b) Air radial temperature contour at a height of 5 m, (c) The flow field distribution of the upper cavity, (d) The temperature distribution of the upper surface of the top cap
Fig. 9. Calculated temperature values in the major zones of the upper reactor cavity under three simulation conditions (color online)
Fig. 10. Illustration of main temperature measure points (red dots) in the upper reactor cavity (color online)
Fig. 11. Simulation results for the lower cavity of simulated reactor (color online) (a) The temperature contour of the lower reactor cavity, (b) The wall temperature distribution of heating rods, (c) The wall temperature distribution of the heat ex-changer
Fig. 12. Calculated temperature values in the major zones of the lower reactor cavity under three simulation conditions (color online)
Fig. 13. Illustration of the main temperature measure points in the lower reactor cavity (color online)
Fig. 14. Distribution of heat transfer power on the wall surface of reactor pressure vessel (color online)
Fig. 15. Distribution of heat transfer power on the surface of heat ex-changer from PRHRS (color online)
Fig. 16. Simulation deviation curves for the upper (a) / lower (b) cavity at the 510 °C calculated condition (color online)
Table 1. The sizes of the main structural parameters in the silo of the simulated reactor
View tableView in ArticleTable 1. The sizes of the main structural parameters in the silo of the simulated reactor
模型主要结构参数The primary structural parameters in the model 尺寸Size / m 上堆舱高度The height of the upper reactor cavity 6.26 上/下堆舱外墙内径The inner diameter of the outer wall of the upper/lower reactor silo 2.8 堆容器外径The outer diameter of the reactor pressure vessel 1.02 堆容器高度The height of the reactor pressure vessel 3.6 余排换热装置内径/外径The inner/outer diameter of heat ex-changer 1.42 / 1.72 下堆舱侧保温棉内径/外径The inner/outer diameter of the insulation cotton on the side of lower reactor cavity 1.2 / 2.8 下堆舱底端的保温棉厚度The thickness of the insulation cotton at the bottom of the lower reactor cavity 0.5
Table 2. Physical properties of the structural materials for the simulated reactor
View tableView in ArticleTable 2. Physical properties of the structural materials for the simulated reactor
材料
Material
密度
Density / kg·m-3
比热
Specific heat / J·(kg·K)-1
导热系数
Thermal conductivity / W·(m·K)-1
发射率
Emissivity
哈氏合金
Hastelloy
500 ℃@8 690
600 ℃@8 660
700 ℃@8 620
800 ℃@8 570
500 ℃@480
600 ℃@470
700 ℃@590
800 ℃@600
500 ℃@18.57
600 ℃@19.0
700 ℃@25.4
800 ℃@24.72
0.3 碳素钢
Carbon steel
7 850 480 λ=72.289-0.039 1·T(K)-
6×10- 6T(K)2
0.3 硅酸铝纤维
Alumina silicate fiber
220 1 140 0.153 0.8
Table 3. Grid independence analysis
View tableView in ArticleTable 3. Grid independence analysis
网格尺寸Mesh size 2 mm×10 mm 2 mm×20 mm 5 mm×10 mm 5 mm×20 mm 上/下堆舱模型总网格数Mesh number / 104 5 017 3 726 2 515 1 424 顶盖上表面温度
Upper surface temperature of the top cap / ℃
147.8 148.1 148 144.3 加热棒附近的空气平均流速
The average air flow velocity near the heating rod / v·s-1
0.384 0.385 0.385 0.372 上堆舱内空气平均温度
The average air temperature in the upper cavity / ℃
43.0 43.2 43.1 41.6 下堆舱内空气平均温度
The average air temperature in the lower cavity / ℃
497.9 498.2 498.1 495.4 保温层外壁面温度
Outer wall temperature of the simulation layer / ℃
42.5 42.3 42.4 40.0
Table 4. Experimental value and CFD calculated value for the upper/lower cavity of simulated reactor
View tableView in ArticleTable 4. Experimental value and CFD calculated value for the upper/lower cavity of simulated reactor
上/下堆舱测温点的描述与位置(R,θ,Z)
Temperature point position of the upper/lower cavity
实验值
Experimental value
/ ℃
计算值
Calculated value
/ ℃
偏差
Deviation / %
上堆舱内空气域(261, 225°, 5 800)
Air area in the upper cavity
49.95 48.03 3.8 54.9 56.7 3.2 顶盖上表面(360, 225°, 4 871)
Upper surface of the top cap of reactor container
124.65 129.97 4.1 顶盖上保温层上表面(300, 90°, 4 621)
Upper surface of the upper insulation layer of the top cap
70.79 75.35 6.1 上堆舱隔热层(1 000, 270°, 3 916)
Insulation layer of the upper cavity
60.16 57.54 4.4 堆容器支撑梁(600, 45°, 4 211)
Support beams of reactor container
70.49 67.93 3.6 上堆舱外墙(261, 315°, 7 900)
Outside wall of the upper cavity
35.84 37.95 5.6 下堆舱余排换热装置内壁面(710, 210°, 2 200)
Inner wall of residual heat removal equipment in the lower cavity
506.12 490.08 3.2 下堆舱余排换热装置外壁面(863, 150°, 2 200)
Outer wall of residual heat removal equipment in the lower cavity
504.25 486.31 3.6 下堆舱隔热层顶端(903, 120°, 2 810)
The up of insulation layer in the lower cavity
470.36 478.62 1.7 下堆舱隔热层底端(0, 0°, 250)
The down of insulation layer in the lower cavity
308.53 304.68 1.3
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Mudan MEI, Chong ZHOU, Yang ZOU, Yao FU, Naxiu WANG. Numerical simulation analysis and experimental validation for the reactor cavity of molten salt reactor[J]. NUCLEAR TECHNIQUES, 2025, 48(7): 070031
Paper Information
Category: Special Issue on The First Academic Annual Conference of the Research Reactor and Innovative Reactor Association of Chinese Nuclear Society and Advanced Nuclear Power System Reactor Engineering
Received: Nov. 8, 2024
Accepted: --
Published Online: Sep. 15, 2025
The Author Email: Chong ZHOU (ZHOUChong), Yang ZOU (ZOUYang), Yao FU (FUYao)
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