炼钢 ›› 2022, Vol. 38 ›› Issue (4): 36-39.

• 转炉及电炉冶炼 • 上一篇    下一篇

石灰石造渣对转炉煤气CO含量影响研究

李晨晓1,2,张  昀1,2,王书桓1,2,薛月凯1,2,张凯旋1,2,孙华康1,2   

  1. 1.华北理工大学 冶金与能源学院,河北 唐山 063210;
    2.唐山市特种冶金及材料制备重点实验室,河北 唐山 063210
  • 出版日期:2022-08-05 发布日期:2022-07-29

  • Online:2022-08-05 Published:2022-07-29

摘要: 为研究石灰石造渣对转炉煤气成分及回收量的影响,在100 t转炉上进行了不同石灰石替代比下的造渣炼钢工业试验。研究结果表明:当铁水温度在1 350~1 650 ℃,石灰石分解产生的CO2可作为弱氧化剂与铁水中元素反应生成CO,反应次序依次为[Si]、[Mn]、[C]、[Fe];通过工业试验证实,石灰石分解产生的CO确实可参与铁水氧化反应,随着石灰石替代比的增加,炉气中CO比例升高;通过理论估算,与石灰造渣工艺相比,石灰石造渣炼钢工艺的吨钢煤气回收量提高约16.12 %,可见石灰石代替石灰造渣还可以增加转炉煤气回收水平。

关键词: 转炉, 石灰石造渣, 二氧化碳, 煤气, 一氧化碳

Abstract: In order to study the influence of limestone slagging on the composition and recovery of converter gas, industrial tests of slagging and steelmaking with different limestone substitution ratios were carried out on a 100 t converter. The research results show that when the molten iron temperature is between 1 350 ℃ and 1 650 ℃, The CO2 produced by the decomposition of limestone can be used as a weak oxidant to react with the elements in the molten iron to form CO. The order of reaction is [Si]、[Mn]、[C]、[Fe]. Industrial tests have confirmed that the CO2 produced by the decomposition of limestone can indeed participate in the oxidation reaction of molten iron. With the increase of the substitution ratio of limestone, the proportion of CO in the furnace gas will increase. Compared with lime slagging process, the gas recovery volume per ton of steel in limestone slagging steelmaking process is increased by about 16.12 %. It can be seen that the substitution of limestone for slagging can also increase the recovery level of converter gas.

Key words: converter, limestone slagging, carbon dioxide, gas, carbon monoxide