大型蓄热式环形加热炉冷态流场试验分析

Experimental Investigation of Flow Field of Large-Scale Regenerative Annular Heating Furnace

根据模化理论,针对某大型高炉煤气双蓄热式环形加热炉,按照10∶1的比例建立了实物模型。根据二维PIV测试技术的原理,用高速摄像仪对各加热段炉膛进行示踪粒子拍摄和速度分布测量。研究发现从烧嘴喷出的气流,一般不会从正对的第一个吸风口吸出,越靠近均热段的喷口气流越不容易被最近的排烟口排出,从而延长了炉气在炉内的停留时间,避免了烟气短路;炉膛截面速度变化较大,距离烧嘴口越远,截面上速度越平缓;在一定的气流喷射角度下,喷嘴口两侧有气流旋涡产生;流量越大,气流越容易到达对侧炉墙。

According to modeling theory, a cold model of a large-scale regenerative annular heating furnace with scale of 1 ： 10 was built. Based on the principle of PIV test, with tracing particles,the high-speed camera was adopted to record velocity field. Results indicate that the airflow from burners could not be sucked by the first opposite nozzle on the other side wall,the closer the burner to soaking section, the more difficult the air removing is and gas residence time could be prolonged, and short-circuit of flue gas could be avoided. The air velocity profile changes greatly in the chamber, the farther the air flow from the noz）le, the less the velocity change is. At a certain angle of the air jet, there are two vortexes at both sides of the burner. The higher the air flow rate,the easier the air flow reaching the opposite wall.