转炉中石灰石替代部分石灰对脱磷、炉气成分及氧枪枪位的影响

The effect of using limestone to displace some lime in converter on dephosphorization efficiency,gas composition and oxygen lance position

石灰石替代部分石灰进行转炉炼钢可降低炼钢生产成本、减少CO_2排放。为研究其加入量对脱磷、炉气成分和氧枪枪位的影响,进行了石灰石替代比分别为18%、19%、20%、25%、28%、29%、39%、41%的工业试验研究和热力学分析。研究结果表明:(1)石灰石替换比为25%时脱磷效果较好,终点磷含量为0.016%,比原工艺0.030%的终点磷含量降低了47%;(2)用石灰石替代部分石灰后煤气开始回收时刻提前1~2min,煤气回收量增加,且石灰石加入量越大,煤气可回收时刻越早;(3)采用石灰石替代部分石灰冶炼时,转炉氧枪基本控制枪位由1.7m升高到1.8m。

Using limestone to displace some lime in converter can decrease the production costs of steelmaking and reduce the emission of carbon dioxide. The industrial tests and thermodynamic analysis were carried out to investigate the effect of limestone substitution ratios （18%, 19%, 200/60, 25%, 28%, 29%, 39% and 41%） on the dephosphorization efficiency, converter gas composition and oxygen lance position. The results show that better dephosphorization efficiency can be achieved when the limestone substitution ratio is 25%, and the end point phosphorous content is 0.016%, which is reduced by 47% compared with the original process of 0.030%. Meanwhile, the moment of recovering the converter gas is one to two minutes earlier than before, and the amount of recovered gas increases. Furthermore, the more limestone is added, the earlier recovery time is. The results also show that the oxygen lance control positionshould be raised from 1.7 m to 1.8 m when using limestone to displace some lime in steelmaking.