热风在高炉热风围管中流动特性的模拟研究

Simulation Study on Flow Characteristics of Hot Blast in Bustle Pipe of Blast Furnace

对鞍钢2580 m^(3)高炉热风围管内热风流动特性开展数值模拟研究,探究各风口风量不均匀分配的内在机理.结果表明,在各风口尺寸相同的条件下,围管内的主体流动并非单纯的单向流动,而是存在返流.热风进入热风围管后,直接冲击热风围管0°处热风支管,导致此处风口风量较大;进入围管后的热风形成两股气流在热风围管入口正对面(即180°处)发生碰撞,导致对应风口风量较大;气流碰撞后部分产生返流,沿着热风围管下部和内侧逆向运动,在热风围管90°和270°位置处与正常运动的气流再次碰撞并汇聚进入此处支管,导致对应风口风量较大.通过对比分析鞍钢高炉风口参数调节措施发现,现场调节措施与本研究结果基本一致.

Numerical simulation of hot blast flow in the bustle of a 2580 m^(3) blast furnace in ANSTEEL was carried out to explore the internal mechanism of non-uniform blast distribution by tuyeres.The results show that,under the condition of uniform tuyere size,the main stream in the bustle is not unidirectional,but with back flow.The hot blast enters the bustle pipe and directly impact the branch pipes beside the 0°position,resulting in large blast volume in the neighbor tuyeres.After entering the bustle pipe,two streams of blast will collide finally at the opposite of the inlet of the bustle pipe(i.e.at the 180°position),resulting in large blast volumes in the corresponding tuyeres.After the collision,part of the blast flow moves backward along the lower part and the inner side of the bustle pipe.At the 90°and 270°positions of the bustle pipe,the backward flows collide again with forward flow,resulting in large blast volumes in the corresponding tuyeres.By comparing and analyzing the practical tuyere-size adjustment measures of the blast furnace in ANSTEEL,it is found that the adjustment measures were basically consistent with the results of the present study.