基于辅料成本控制的京唐脱磷炉终点优化模型

End-point optimization model of Jingtang dephosphorization furnace based on material cost control

为了增加转炉双联工艺终点控制精度,降低生产成本,以物料平衡和热平衡为理论基础,结合京唐生产数据,应用C#软件设计双联工艺辅料加入及成本计算模型。通过该模型分析在一定铁水条件和钢水条件下,改变脱磷炉终点碳含量、温度和磷含量对整个双联工艺石灰、白云石、矿石及加热剂的加入量和成本的影响。结果表明,终点温度和成分的变化对上述辅料加入量均有影响,其中加热剂用量对辅料成本影响最为显著,因此,在满足脱碳炉终点要求以及废钢用量的情况下,应尽量减少加热剂的使用。当脱磷炉终点w([P])和温度不变时,脱磷炉终点w([C])越高,辅料成本越低,因此,在脱磷炉中要尽量少脱碳,脱到碳质量分数为3.635%,此时加入的辅料成本最低;当脱磷炉终点w([C])和w([P])不变时,脱磷炉终点温度越低越好,但在温度低于1 333℃时,由于脱碳炉加热剂的加入,成本大幅提高;当脱磷炉终点w([C])和温度不变时,应该利用脱磷炉的低温条件,尽量多脱磷,在现有工艺技术条件下,终点w([P])在0.029%～0.033%变化时,辅料成本最低。

In order to increase the accuracy of the end control of the duplex process,the production cost is reduced.Based on material balance and thermal balance as the theoretical basis,combined with Jingtang production data,application of C#software to design the joining and cost calculation model of duplex process materials.Through the model analysis,under the conditions of certain molten iron and molten steel,the effect of changing the C content,temperature and P content of the dephosphorization furnace(Dep-BOF)on the addition amount and cost of lime,dolomite,ore and heating agent in the whole double process.The results show that changes in the end temperature and composition have an effect on the amount of the above-mentioned materials.The amount of the heating agent has the most significant influence on the cost of the materials.Therefore,the heating agent should be minimized when meeting the end-point requirements of the decarburization furnace(Dec-BOF)and the amount of scrap steel.When Dep-BOF end-point w([P])and the temperature are constant,the higher Dep-BOF end-point w([C]),the lower the auxiliary material cost.So in the Dep-BOF should be as little as possible decarbonize to 3.635%,the lowest cost of materials.When the Dep-BOF end-point w([C])and w([P])are unchanged,the lower the Dep-BOF end-temperature is better,but when the temperature is lower than 1 333°C,due to the addition of Dec-BOF heating agent,the cost increased significantly.When the end-point w([C])and temperature of the Dep-BOF are constant,the Dec-BOF low-temperature conditions should be utilized to remove as much phosphorus as possible.Under the existing technological conditions,when the end-point w([P])from 0.029%to 0.033%,the cost of materials is the lowest.