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以物料平衡和热力学平衡等为理论基础,通过钢厂数据对理论结果进行修正,应用Visual Basic软件设计单渣脱磷过程石灰消耗量预报模型。预报的石灰消耗量与钢厂数据进行对比,误差范围在20%以内的占到93.4%,10%以内的占到82.7%。通过该模型分析铁水硅、磷质量分数和终点磷质量分数对石灰消耗量的影响。结果表明,随着铁水硅、磷质量分数提高及钢水终点磷质量分数降低,石灰料消耗量变大。铁水磷质量分数超过临界值时,石灰消耗量显著增加,在铁水硅质量分数分别为0.2%、0.4%、0.6%和0.8%的条件下,铁水临界磷质量分数分别为0.15%、0.14%、0.13%和0.12%;终点磷质量分数小于0.01%时,石灰消耗量显著增加,经济条件变差,小于0.007%时,随着石灰消耗量增加,终点磷几乎不变,单渣法不适合生产磷质量分数低于0.007%的超低磷钢。
Based on material balance and thermodynamic equilibrium, the theoretical results are corrected by steel mill data. Visual Basic software is used to design the prediction model of lime consumption in single slag dephosphorization process. The predicted lime consumption is compared with the steel mill data, accounting for 93.4% within 20% of the error range and 82.7% within 10%. Through the model, the effects of silicon, phosphorus and end-point phosphorus fractions on lime consumption were analyzed. The results showed that as the mass fraction of silicon and phosphorus in molten iron increased and the phosphorus content in the final molten steel decreased, the consumption of lime material became larger. When the mass fraction of molten iron and phosphorus exceeds the critical value, the consumption of lime increases significantly. Under the condition of 0.2%, 0.4%, 0.6% and 0.8%, respectively, the critical mass fraction of molten iron is 0.15% and 0.14% 0.13% and 0.12%, respectively. When the final phosphorus content was less than 0.01%, the lime consumption increased significantly. When the economic conditions deteriorated, when the content of lime was less than 0.007%, the end point phosphorus almost did not change with the increase of lime consumption. Phosphorus content of less than 0.007% of the ultra-low phosphorus steel.