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基于电磁学和传热学理论,针对结晶器内钢液,建立方坯软接触电磁连铸结晶器内电磁场和温度场的数学模型,利用有限元软件模拟了结晶器内钢液的电磁场和焦耳热场。结果发现:电源频率为20 kHz,电流强度为640 A时,结晶器内钢液外表面因感应生成一定量的焦耳热,形成厚度约10 mm“集肤层”。焦耳热随电源频率增加而增大,频率高于40 kHz后增幅减小,但焦耳热随电流强度增加呈正比例增大关系。
Based on the theory of electromagnetism and heat transfer, the mathematical model of the electromagnetic field and temperature field in the billet soft contact electromagnetic continuous casting mold is established for the molten steel in the mold. The electromagnetic field and joule of the liquid steel in the mold are simulated by finite element software Hot field. The results show that when the power frequency is 20 kHz and the amperage is 640 A, a certain amount of Joule heat is generated on the outer surface of the molten steel in the mold to form a thickness of about 10 mm. The Joule heat increases with the increase of the power frequency, but decreases with the increase of the frequency above 40 kHz. However, the Joule heating increases proportionally with the increase of the current intensity.