A thermal analysis control method for preparing magnesium oxide crystal electric arc furnace

Abstract

The invention relates to a thermal analysis control method for an electric arc furnace for preparing magnesia crystals, which belongs to the technical field of simulation control in the crystal preparation industry. The method mainly includes the following steps: (1) establishing a finite element model for the electric arc furnace; (2) setting various physical parameters; (3) solving the time-harmonic electric field to obtain the ohmic thermal power distribution; (4) solving the equivalent heat of the arc (5) The power distribution obtained by ohmic heat and the equivalent heat flow of the arc is used as the heating load, and the ambient temperature and convection coefficient are set to calculate the temperature field in the furnace; (6) According to the calculation results, optimize the control on the basis of the original process Strategy. The effect and benefit of the present invention is to provide a mathematical analysis tool for analyzing the internal temperature field and molten pool shape for the smelting process of magnesium oxide at the present stage, to formulate more accurate and reliable control strategies for the smelting process, and to demonstrate the temperature with the help of three-dimensional images The change of the gradient field is beneficial to deepen the understanding of the process from raw material melting to crystal growth.

Description

technical field [0001] The invention belongs to the technical field of simulation control of crystal preparation industry, relates to a thermal analysis system of a three-phase submerged arc furnace and a corresponding industrial control method, in particular to a finite element method for thermal analysis of an electric arc furnace for preparing magnesium oxide crystals method. Background technique [0002] Magnesium oxide crystals have been applied to many high-tech fields, such as thin-film growth substrates for high-temperature superconducting devices, substrate substrates for semiconductor materials, protective films for plasma displays, high-temperature and high-precision optical materials, and high-temperature crucible materials. [0003] At present, the mainstream technology for producing magnesium oxide crystals is the three-phase AC electric arc furnace melting method. This method mainly heats raw materials by high-temperature electric arc to form a melt, and afte...

AI Technical Summary

Problems solved by technology

The main disadvantage of the existing electric arc furnace technology is that during the entire smelting process, the temperature field distribution and the shape of the molten pool in the electric arc furnace, which are critical to controlling crystal growth, are unknown, resulting in the melting of magnesia ore powder and the crystallization process. Poor controllability seriously restricts the improvement of crystal yield and quality

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