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通过对大连钢厂30t电弧炉炉衬内表面温度的测定、分析与讨论,得出如下结论:1)电弧炉内,炉衬内表面温度分布不均衡,它与三相电弧功率不平衡度有对应关系。在试验条件下,测点中的最高温度为1596℃(5号点),三个“准热点”温度差异最高达12.4％,冷、热点的温度差为160～300℃,炉衬上、下温度梯度为0.29～0.61℃/mm。2)三相电弧功率不平衡度除与短网阻抗不平衡度有一定关系外,还受供电制度的影响。当二次电压提高时,电弧功率不平衡度变小;二次电流增加时,该值增大。3)电弧炉采用长电弧辅以泡沫渣保护的操作,对实现经济用电与获得好的炉内热工状况是有利的。
Through the measurement, analysis and discussion of the inner surface temperature of the 30t electric arc furnace lining in Dalian Steel Plant, the following conclusions are drawn: 1) The inner surface temperature distribution in the electric arc furnace is unbalanced, which has a corresponding relationship with the imbalance of the three-phase arc power . Under the experimental conditions, the maximum temperature in the measuring point is 1596 ℃ (point 5), the difference between the three “quasi-hot spots” is as high as 12.4%, the temperature difference between cold and hot spots is 160-300 ℃, Gradient is 0.29 ~ 0.61 ℃ / mm. 2) In addition to the three-phase arc power imbalance in short-circuit impedance imbalance has a certain relationship, but also by the power supply system. When the secondary voltage increases, the arc power imbalance decreases; secondary current increases, the value increases. 3) The use of long arc electric arc furnace with foam slag protection operation, to achieve economic use of electricity and get good thermal state of the furnace is beneficial.