Abstract: Based on the basic structure of a baffle demister, a new composite demister was manufactured by adding a row of round tubes in the bend pipe area. The method of computational fluid dynamics was used to numerically simulate and analyze the original baffle demister, the baffle demister with hook plate and the new composite demister. Results show that when the droplet size is less than 20 μm, the defogging efficiency of the new composite demister is significantly higher than that of the original baffle demister and the baffle demister with hook plate; when the inlet flow rate is 4 m/s, and the droplet size is 10 μm, the new compound demister would have a defogging efficiency 9.33% higher than the original baffle demister, and 5.33% higher than the baffle demister with hook plate; the restriction of tube bank against incoming flow and the turbulence of the airflow can improve the defogging effectiveness of the new composite demister; the new composite demister captures the maximum number of droplets in tube bank area, indicating that the tube bank plays an important role in the new composite demister.