Structure analysis of high temperature heat storage conductor based on thermal-electricity-magnetic field coupling

doi:10.19799/j.cnki.2095-4239.2020.0404

Abstract

Abstract:

In the inspection of the internal conductor of the solid heat storage device, it was found that problems such as the deformation of the conductor, the self-short circuit, and the breakdown of the component due to the electromagnetic force of the heat transfer conductor under the high temperature situation, which seriously affect the safety of heat storage. In order to study the electromagnetic distribution and force of the electric heating element in the heat storage hole, this article focuses on the electromagnetic analysis and calculation of the 800 ℃ high-voltage electric heating element structure optimization design to ensure the reasonable distribution of electromagnetic field under high voltage. A three-dimensional finite element calculation model was established for the spiral and wave-shaped electric heating elements, the magnetic density distribution of the two models was analyzed, and the bending structure of the wave-shaped electric heating element was optimized. The influence of different voltages and different wave distances on the magnetic density spatial distribution of flat-angle wave elements is analyzed. Research shows that the magnetic density distribution of the wave-shaped electric heating elements in the two structures is more reasonable; The optimized flat-angle design can effectively reduce the internal and external breakdown of the component. The voltage only has an effect on the magnetic density value of the heating element, and the large wave pitch can effectively reduce the magnetic density distribution. While proving the feasibility of the proposed electric heating element model, this article also has a good guiding value for heat storage safety.

Key words: thermal storage device, high temperature and high voltage, electric heating element, magnetic density distribution, structural analysis

CLC Number:

TM 854

Yanfeng TIAN, Xinxin ZHAO, Qitong FU, Zhe WANG, Xuzhang ZHAO. Structure analysis of high temperature heat storage conductor based on thermal-electricity-magnetic field coupling[J]. Energy Storage Science and Technology, 2021, 10(3): 1051-1059.

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密度/g·cm^-3	导热系数/W·(m?K)^-1	比热容/kJ?(kg?K)^-1
2.95	2.5	1.079
温差范围/℃	耐火度/℃	导电率/S?m^-1
200～1000	2000	1

材料	相对磁导率/H·m^-1	相对介电常数	电阻率/Ω?m
加热丝	2.58	1	1.35
空气	1	1	0.58e14
蓄热砖	1	1	6.47e9

电压等级/kV	磁密范围/T
电压等级/kV	轴向	横向
35	3×10⁴～5×10⁴	0.5×10⁴～1.2×10⁴
66	5×10⁴～9×10⁴	0.8×10⁴～2.3×10⁴
110	9×10⁴～16×10⁴	1.5×10⁴～4×10⁴

波距宽度/mm	磁密范围/T
波距宽度/mm	轴向	横向
20	10×10⁴～16×10⁴	2×10⁴～9×10⁴
25	9×10⁴～16×10⁴	同上
30	8×10⁴～16×10⁴	同上

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