Abstract: According to application of gas supply system of bottom blowing for 120 t converter at Angang Steel, the BOF bottom blowing control model has been established by PID control arithmetic method to realize the rapid, accurate and stable control of gas flow in gas supply pipeline, and meet the requirements of the production process, which could keep the bottom blowing element under stable ; good shape and air permeability and not easy been blocked during the converter service period. With the bottom blowing control model, equipment and technology optimized, the end-point [%C] • [%O] is reduced from 0.00316 to 0.00273, the end-point T. Fe content in slag is reduced by 1.69% , the economic benefit of a ton steel is 12.2 yuan /t to achieve the effect of improving quality and reducing cost.

Key words: 120 t Converter, Gas Supply System of Bottom Blowing, Bottom Thickness, Carbon-Oxygen Equilibrium, T. Fe in Slag ,

摘要： 根据鞍钢120 t转炉底吹供气系统的应用情况,基于PID调节算法建立了转炉底吹系统控制模型,可以实现供气管道气体流量的迅速、准确、稳定控制,满足生产工艺要求,使底吹元件在炉役期内可以保持稳定的形态和良好的透气性能,不易堵塞。该转炉进行底吹供气控制模型、设备和工艺优化后,钢水终点碳氧积由0.00316降低为0.00273,终点炉渣T.Fe含量降低1.69%,吨钢降低成本12.2元,经济效益显著。