废气分析在RH脱碳过程中的应用

来源期刊：钢铁2010年第2期

论文作者：刘柏松 朱国森 李本海 崔爱民 李焕喜

文章页码：23 - 27

关键词：废气分析； RH； 数学模型； 超低碳钢

Key words：waste gas analysis； RH； mathematic model； ULC steel

摘    要：根据RH废气分析系统对废气流量及其中CO、CO₂气体含量的测量,建立了废气分析脱碳数学模型。经验证,模型计算值与实际测量值吻合较好。对于成品碳的质量分数小于等于20×10^-6的超低碳钢,模型计算的RH自然脱碳终点碳的质量分数误差在±3×10^-6之间。废气流量修正系数δ采用分段取值更能符合实际情况,RH精炼开始3 min内,δ为0.35,3 min后δ为0.6。在RH自然脱碳后期,当废气中CO的质量分数由峰值降低到5%时,钢水中碳的质量分数的平均值达到13×10^-6,已经低于RH终点碳含量的要求值,可以判定RH脱碳过程结束。

Abstract: Based on the waste gas flow rate and CO,CO₂ content measured by the RH waste gas analysis system,the mathematic model on waste gas analysis decarburization was established.The calculated results by model inosculated the measured ones.The precision of the end-point carbon content of conventional RH treatment was ±3×10^-6 for ULC steel(w[C]≤20×10^-6).The correction coefficient,δ,of waste gas flow rate was evaluated by two subsections according with the factual production process.The value of δ was 0.35 when the RH treatment time was less than 3 min,otherwise δ was 0.6.When the CO content of waste gas decreased to 5% from the maximum at the terminal stage of RH decarburization,the average value of carbon content in the bulk liquid steel was 13×10^-6 which was below the requirement content at the end of RH process,therefore,the RH decarburization process could be judged to finish.