Particle deposition in flue gas turbines of FCC (Fluid Catalytic Cracking) is very common. Particle deposition causes a lot of damage to turbines, such as corrosion, erosion, increased flow resistance, unbalanced vibrations, and fatigue damage of the blades. In this study, cold and hot experimental systems were built, and the blade was improved by coating it with a chromium carbide alloy at a high temperature to achieve a lower surface roughness of 0.069 mu m. The effect of surface roughness on particle deposition was studied both in cold and hot experimental systems. The experimental results indicated that the new improved blade can effectively reduce the particle deposition. With a particle concentration of 100 g/m(3), the improved blade reduced the particle deposition by 39.3%, 62.9%, and 53% corresponding to gas temperatures of 700, 500 and 300 degrees C, respectively. However, the surface roughness has little effect on the distribution of deposited particles. (C) 2019 Elsevier B.V. All rights reserved.