The working principle of the demister: When the flue gas passes through the curved channel of the demister, the liquid droplets entrained in the air flow are separated under the action of inertial force and gravity; the desulfurized flue gas flows through the demister at a certain speed. , the flue gas changes direction of movement rapidly and continuously. Due to the action of centrifugal force and inertia, the mist droplets in the flue gas hit the demister blades and are captured. The mist droplets gather to form a water flow. Due to the action of gravity, they fall to the slurry. In the pool, the purpose of gas-liquid separation is achieved, so that the flue gas flowing through the demister is discharged after meeting the defogging requirements. The defogging efficiency of the demister increases with the increase of air flow speed. This is due to the high flow speed and the large inertial force acting on the mist droplets, which is beneficial.
for the separation of gas and liquid. However, an increase in flow rate will cause an increase in system resistance and increase energy consumption. Moreover, there is a certain limit to the increase in flow rate. If the flow rate is too high, it will cause secondary water entrainment, thereby reducing the defogging efficiency. Usually, the highest flue gas flow rate through the mist eliminator section without causing secondary water entrainment is defined as 臨界流速 , the speed is related to the demister structure, system water load, air flow direction, demister layout and other factors. The design flow velocity is generally selected at 1-4 m/s. For general purposes, the collection efficiency can reach 98~99% when capturing particles in the range of 15~30µ at a speed of 1~4m/sec.