炼铁高炉TRT系统炉顶压力动态数学模型研究

为实现高炉顶压的高精度控制，提出了高炉煤气余压透平装置(TRT)系统炉顶压力的动态数学模型.在分析TRT系统工作机理基础上，将其分解为高炉煤气反应容器、炉顶压力容器、煤气管道、煤气流量调节阀4部分.根据气体流动方程，通过线性化和拉氏变换，建立各单元的动态数学模型.结合基于高炉煤气生成过程经验公式和物料平衡关系的各单元模型，推导出TRT系统的高炉顶压动态数学模型.分析了旁通阀开度及鼓风机风量对高炉顶压的影响.结果表明，由该模型得到的顶压变化趋势和现场数据基本一致.当鼓风机流量增大时，顶压将增大，旁通阀开度增大时，顶压将减小.

Research on dynamic mathematical model of top gas pressure in TRT system

To realize high precision control of top pressure,the dynamic mathematical model of top gas pressure recovery turbine(TRT) system was researched.The TRT system was decomposed into blast furnace gas reaction container,roof pressure container,gas pipeline and gas flowrate regulating valve after its mechanism analysis.Based on the gas flowing equation,each unit dynamic mathematical model was established using linearization and Laplace transform.By integrating each unit model based on material balance relationship and blast furnace gas producing process empirical formula,the dynamic mathematical model of the TRT system top pressure was deduced.The effects of by-pass valve opening and flux of the fan on top pressure were investigated.The results show that the trend of top pressure obtained by the model agrees well with the field data.The top pressure increases with the increasing flux of the fan,and the top pressure increases with the decreasing by-pass valve opening.