烟气轮机动叶流道内颗粒运动的流动显示实验

Visualization of particle movement in flow path of flue gas turbine

烟气轮机是催化裂化装置能量回收系统中的关键设备,但内部烟气介质含有催化剂颗粒,易在内壁面沉积、结垢且对叶片造成冲蚀、磨损,影响机组正常运行。为研究烟气轮机内部复杂的两相运动规律,以实际烟气轮机为基准设计了模型烟气轮机,利用高速摄像机拍摄模型烟气轮机动叶流道内的颗粒运动形态,捕捉颗粒与壁面的作用过程。结果表明,动叶前缘是颗粒碰撞的高频区,且颗粒碰撞后速度方向变化量较大。颗粒与动叶压力面发生多次碰撞的位置集中在压力面后缘,小粒径颗粒较易紧贴动叶压力面运动。实验结果为进一步探索催化剂颗粒在烟气轮机内部的沉积结垢机理提供了重要依据。

Flue gas turbine is a key equipment in energy recovery system of catalytic cracking unit.But easy deposition of catalyst particles in flue gas on inner wall caused erosion and wear on turbine blades and affected normal system operation.In order to study complex two-phase movement in flue gas turbine,a model flue gas turbine was designed based on actual system.Particle movement in flow path of flue gas turbine was photographed by high speed camera to capture interaction process between particles and wall surface.The results show that the leading edge of turbine moving blade is high collision frequency region where velocity direction is largely changed after particle collision.The trailing edge of moving blade pressure surface is a place where particles have multiple collisions.Small size particles easily move close to the moving blade pressure surface.The experimental results provide important bases for further exploring catalyst particle deposition mechanism in flue gas turbine.