高炉喷吹还原气操作的数学模拟研究

副产煤气的高效利用对钢铁产业的节能降耗和环境保护意义重大。为此，提出了一个新的高炉风口喷吹高炉、转炉和焦炉煤气技术，并利用多流体高炉模型对其进行了详细模拟研究，预测了炉内现象和操作性能的变化。在维持回旋区温度、炉腹煤气量及渣面处铁水温度一致的条件下，模拟结果表明与现行常规操作相比，风口喷吹煤气后炉身温度下降，但整个炉内H₂/CO浓度显著提高，炉身烧结矿间接还原加速，产量明显增加，热利用效率明显改善。其中喷吹焦炉煤气效果最为显著，高炉CO₂产生量大幅度降低。随工艺氧制备等技术的进步，高炉喷吹副产煤气技术具有广阔的应用前景。

Numerical Analysis on Blast Furnace Operation With Reducing Gases Injection

Fully exploit by-product gas in the steelworks plays a great role on reducing energy consumption and environmental load of steel industry.A new process was put forth: injection of cold blast furnace top gas, basic oxygen furnace gas and coke oven gas into blast furnace tuyeres.This process is numerically simulated by multi-fluid model under constant raceway temperature,both gas flow rate and hot metal temperature on slag surface.Model simulations revealed that: in comparison to conventional operation,with the injection of BF,BOF and coke oven gases,the temperature level tends to decrease in the shaft,in-furnace CO and/or H2 concentration are evidently enhanced,and the reduction of iron-bearing burden is accelerated.Furthermore,the productivity increases while heat efficiency improves under injection of three kinds of reducing gases.The effects of coke oven gas injection are much more remarkable,and less CO2 emission for blast furnace unit is available.If the relevant technologies including commercially manufacturing of process oxygen are feasible,the innovative process of reducing gas injection will possess broad potential for the practical application.