Abstract: On the basis of commercial software ANSYS, the scalar voltage potential method and two scalar magnetic potentials method were used to establish a calculating module of magnetic field and electric field in aluminum reduction cells. The calculated results indicate that the horizontal magnetic filed forms a clockwise swirl and the vertical magnetic field presents the relation of reversed symmetry in 154kA prebaked anode aluminum reduction cells. By the comparison between calculated results and measured results, it is shown that the errors of |Bx|max, |By|max and |Bz|max are less than 10% and the average errors of Bx, By and Bz in every point are less than 15%. These indicate that the results calculated by applying the scalar voltage method and two scalar magnetic potentials method are comparatively precise and meet the need of designing aluminum reduction cells bus-bar.
Computation of 3 D magnetic field in prebaked cells using scalar voltage potential method and two scalar magnetic potentials method
Abstract:
On the basis of commercial software ANSYS, the scalar voltage potential method and two scalar magnetic potentials method were used to establish a calculating module of magnetic field and electric field in aluminum reduction cells. The calculated results indicate that the horizontal magnetic filed forms a clockwise swirl and the vertical magnetic field presents the relation of reversed symmetry in 154 kA prebaked anode aluminum reduction cells. By the comparison between calculated results and measured results, it is shown that the errors of |Bx|max, |By|max and |Bz|max are less than 10% and the average errors of Bx, By and Bz in every point are less than 15%. These indicate that the results calculated by applying the scalar voltage method and two scalar magnetic potentials method are comparatively precise and meet the need of designing aluminum reduction cells busbar.
Fig.4 Distribution of current density in aluminium liquid(A/m2)
图5 槽内磁感应强度Bx分布图
Fig.5 Distribution of magnetic field Bx
图6 槽内磁感应强度By分布图
Fig.6 Distribution of magnetic field By
图7 槽内磁感应强度Bz分布图
Fig.7 Distribution of magnetic field Bz
图8 槽内三维磁场矢量图
Fig.8 Vectorgraph of magnetic field
表1 磁场测量与计算结果比较
Table 1 Comparison of measured and calculated magnetic fields
Point
Point coordinate/m
Measured result/10-4T
Calculated result/10-4T
x
y
z
Bx
By
Bz
Bx
By
Bz
1
-2.45
-1.69
0.946
-126.2
38.6
-7.1
-121.3
37.67
-6.82
2
-0.35
-1.69
0.946
-135.0
42.2
-5.8
-136.0
44.78
-3.14
3
1.75
-1.69
0.946
-130.1
-48.5
5.4
-127.9
-44.94
5.37
4
3.11
-1.69
0.946
-85.6
-25.5
6.0
-95.04
-18.44
4.48
5
-2.45
1.69
0.946
101.0
7.5
15.6
105.97
5.02
13.59
6
-0.35
1.69
0.946
88.6
17.5
21.7
111.06
14.23
22.52
7
1.75
1.69
0.946
106.7
-42.6
-39.2
107.6
-43.53
-36.45
8
3.11
1.69
0.946
115.5
-2.5
-27.2
94.25
-5.49
-25.72
9
-3.89
1.15
0.946
53.8
-7.4
-9.6
42.82
-6.34
-5.21
10
-3.89
0
0.946
18.6
15.5
-5.3
5.94
21.2
-3.42
11
-3.89
-1.15
0.946
-45.8
18.8
-5.4
-40.62
18.18
-7.01
12
3.89
1.15
0.946
54.7
-20.3
-9.3
43.22
-22.86
-6.73
13
3.89
0
0.946
-3.4
-18.1
13.3
-1.14
-19.06
13.36
14
3.89
-1.15
0.946
-54.3
9.1
3.1
-41.46
8.72
2.78
Magnetic field
Measured result/10-4T
Calculated result/10-4T
|Bx|max
135.0
136.0
|Bx|ave
80.0
50.18
|By|max
48.5
53.2
|By|ave
22.4
7.45
|Bz|max
39.2
36.74
|Bz|ave
12.7
3.30
|Bx|max, |By|max and |Bz|max: maximal magnetic field in direction x, y and z; |Bx|ave, |By|ave and |Bz|ave: average magnetic field in direction x, y and z。