焦炉煤气改质后可用于生产直接还原铁, 为炼钢提供优质的原料. 利用热重分析法, 研究了H₂ 与CO 物质的量比(H₂/CO)、温度对铁矿石球团矿还原速率及其碳沉积速率的影响. 实验结果表明: H₂ 的还原能力大于CO, 且随着混合气体中H₂ 含量的增加, 铁矿石球团矿的 还原速率增大; 当H₂/CO 比大于8/2 时, 增加H₂ 含量对还原速率影响减小; 在铁矿石还原 后期出现碳沉积, 且碳沉积速率随着H₂ 含量的增加而减小; 低温易于碳沉积, 但当温度高于 850 °C 时, 碳沉积得到抑制.

Reformed coke oven gas (COG), a high quality raw material in steelmaking, can be used to produce direct reduced iron (DRI). In this work, the influences of H2/CO ratio and temperature on the reduction rate and carbon deposition behavior during the reduction process of iron ore are investigated by thermo- gravimetric analysis. The experimental results show that the reduction capacity of H2 is higher than that of CO. The reduction rate increases with the increase of H2 concentration in the mixture gases. When H2/CO ratio is higher than 8/2, the influence of H2 concentration in the mixture gases on the reduction rate decreases. Carbon deposition is observed in the later stage of the COrich gases reduction process. The carbon deposition rate decreases with the increase of H2 concentration in the mixture gases. Carbon deposition occurs preferentially at low temperature. When the temperature is above 850 C, carbon deposition is suppressed.