大型电站锅炉四角切圆炉膛中气体煤粉多相流动特性的数值试验研究

Numerical computations of the gas-particle multiphase flow in a tangential furnace of the power station

本文运用计算机辅助优化数值试验方法对大型电站锅炉四角切圆炉膛中气体和煤粉颗粒在不同运行工况下的流动特性进行了基础性研究．得到了满负荷运行和变工况缺角运行时炉内空气动力场的变化，并了解了实际切圆直径沿炉膛高度变化及截面上最大切向速度沿炉膛变化的规律．对煤粉颗粒的运动轨迹计算表明，颗粒直径对其运动影响较大．另外，对变工况运行时所引起的煤粉火焰偏转情况进行了分析．部分数值试验的计算结果和实际的现场测试结果吻合较好．

fundamental study is conducted with the CAT (Computer-Aided-Test) method on the flow characteristics of gas and coal particles in the tangential furace of a power station in different operating cases. The aerodynamic changes of the flows at specified load and insufficient load of lacking corners are obtained. A introduction is provided of the practical tangential circle diameter and the maximum tangential velodity in cross section varing along the height of the boiler. The calculation to the trajectories of the coal particles shows that particle diameter has a large effect on the motion of coal powders. In addition, an analysis is conducted to the deflection of the coal flame resulted from the changes of the load. Some computational results agree well with that of the practical test in the power station.