Uneven bubbling of sieve tray tower

When the rising gas velocity of the sieve tray tower is lower than a certain value, the bubbling on the sieve tray tower will be uneven. Only bubbles appear in the sieve plate area to form a honeycomb foam layer, while in other parts it is a clear liquid layer. This phenomenon will reduce the gas-liquid contact surface on the sieve plate and the liquid will leak from the sieve plate, which will destroy the distillation working condition.