Study of Droplets Size Distribution and Spray Performance of Combined Trapezoid Spray Tray (CTST)

Abstract

Liquid droplet size distribution and spray has the direct influence upon the combined trapezoid spray tray (CTST). This paper makes use of experimental tower with the diameter of 570mm and high speed camera to conduct the research on the liquid droplet size distribution and spray of the high speed camera. The results show that: Under the spray operation, liquid droplet size distribution is more suitable for upper limit logarithmic normal distribution function; Under the different clear liquid heights, liquid droplet size changes along with the change of gas velocity; In the case of fixed clear liquid height, liquid droplet size D32 will decrease along with the increase of kinetic energy factor in plate hole; In the case of same kinetic energy factor in plate hole, liquid droplet size D32 will decrease along with the increase of clear liquid height; Gas velocity of spray hole is the main factor influencing the spray angle; Along with the increase of gas velocity and liquid flow, spray angle will increase and range is smaller; With the increase of gas velocity, the influence of increase of liquid flow upon the spray angle will gradually be weakened; With the increase of gas velocity and liquid flow, liquid droplet distribution within the spray angle tends to be more uniform, but the increase of gas velocity makes the increase area of distribution density mainly concentrates on between (5°, 20°) and (40°, 50°). Liquid film speed distribution on the spray hole has the tendency of upper big and lower small. Liquid film speed increases with the increase of gas velocity, and presents the slight decrease with the increase of liquid flow.