1. Brief introduction of demister function

 

The mist eliminator is used to separate the liquid droplets carried by the flue gas. In the absorption tower, it is composed of upper and lower secondary demisters (horizontal or diamond) and flushing water system (including pipeline valves and nozzles, etc.). After the flue gas after purification treatment, after passing through the two-stage horizontal demister, the slurry droplets carried by it are removed. The small droplets separated from the flue gas slowly condense into larger droplets, and then slide down the mist eliminator blades to the slurry pool. In the upper and lower parts of the demister and the lower part of the secondary demister, there is a set of headers with nozzles. The cleaning water of the demister in the header flushes the solid particles deposited in the demister in turn through the nozzle. After being washed and purified, the flue gas flows out of the absorption tower, and finally discharged into the chimney through the flue gas heat exchanger and the clean flue.

 

2. Demister body The demister body is assembled from the structure of demister blades, fixtures, clamps, and brackets.

 

Its function is to capture the droplets and a small amount of dust in the flue gas, reduce the water in the flue gas, and prevent the vibration of the fan. The mist eliminator blade is a basic and important component of the mist eliminator, and its performance has a vital influence on the operation of the entire mist eliminator. The mist eliminator blades are usually made of polymer materials (such as polypropylene, FRP, etc.) or stainless steel (such as 317L). There are many types of demister blades. According to the geometric shape, it can be divided into broken line type (a, d) and streamline type (b, c). According to the structural characteristics, it can be divided into 2-channel blades and 3-channel blades.

 

The arrangement of mist eliminators usually includes: horizontal, herringbone, V-shaped, combined and other large desulfurization absorption towers, mostly in herringbone layout, V-shaped layout or combined layout (such as diamond, X-shaped). The horizontal type is adopted on the horizontal section of the outlet of the absorption tower.