高压水平管下高炉喷吹稳定性优化数值模拟与试验

Numerical Simulation and Experiment of High-Pressure Horizontal Blast Furnace Injection Stability Optimization

针对高炉喷煤系统在喷吹方面存在能耗大、煤粉浓度波动大、管道堵塞等问题,通过Fluent建立水平管输送模型,获得表观气速、输送介质、煤粉质量流量、管径等主要参数影响煤粉流动特性的相关规律,进而分析喷吹系统稳定性的最佳工作参数组合,并进行试验验证.试验结果表明,压降随着风速的增大先减小后增大;表观气速4~6 m/s、压力0.8 MPa、管径114 mm时,喷吹系统压降最小,煤粉浓度波动较小,管道不会堵塞,压损降低10%,证明了试验结果和仿真的一致性.该研究为高效率喷吹技术研发提供了理论和技术参考.

To solve problems with technical bottlenecks of large energy consumption,large fluctuations in pulverized coal concentration and blocked pipelines in blast furnace coal injection system,a horizontal pipe conveying model was established by using Fluent.Relevant laws of apparent gas velocity,conveying medium,pulverized coal mass flow,pipe diameter and other main parameters affecting the flow characteristics of pulverized coal,were obtained.And then the optimal working parameter combination of the stability of the injection system was analyzed and experimentally verified.The test results show that the pressure drop first decreases and then increases with the increase of wind speed.When the apparent gas speed is 3~6 m/s,the pressure is 0.8 MPa,and the pipe diameter is 114 mm,the pressure drop of the injection system is minimal,the fluctuation of pulverized coal concentration is small,the pipeline will not be blocked,and the pressure loss is reduced by 10%,which proves the consistency of the experimental results and simulation.This study offers a theoretical and technical insight into the research and development of high-efficiency injection technology.