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.