Experimental Study On Gas-Solid Two-phase Flow In Catalytic Cracking Flue Gas Turbine

Flue gas turbine is an important equipment in the energy recovery system of catalytic cracking unit,but the catalyst particles in the flue gas lead to deposition,scaling and other issues which seriously affect the normal operation of the unit.In order to study the complex two-phase flow,the cold model was established according to a ratio of 1: 2.5.The two-dimensional PIV of ILA was used to measure the gas-solid two-phase flow field of the three faces.The gas phase and solid phase were measured by 1?m oil droplets,5?m hollow glass spheres and 20?m catalyst particles which as seeding particles.The results show that the flow of the gas phase in the whole stage is a process of accelerating and deflecting first,then decelerating and flowing around blades.The deflection amount of the two phases in the vane channel is smaller than that of the blade channel,and the deflection amount of the particles is smaller than the amount of gas phase deflection.The inlet angle of the gas phase is matched with the blade type,and the velocity of the outflow is close to the axial direction.Olympus high-speed video is used to capture the particles movement at a speed of 5000 frames / s.Found that the leading edge of the blade is a high frequency region of particle collision.Particles are prone to collisions with the trailing edge of the pressure surface.And the particles have a large velocity direction change after the collision.The position of the particles colliding with the pressure surface of blades is concentrated at the trailing edge,small particles easy to move close to the pressure surface.