Shape and characteristics of AF foam pump demister plate

In wet FGD system, mist eliminator plates are usually made of polymer materials (polypropylene, fiberglass reinforced plastics) or stainless steel. There are many kinds of mist eliminator plates. As shown in Figure 3-20, mist eliminator plates can be divided into two-channel plates and three-channel plates according to their geometrical shapes and structural characteristics. The change of 90 degrees of smoke flow direction is also called a bend. For a channel.

The defogger plates of various structures have their own characteristics. Figure 3-20 (a) plate is simple in structure and easy to wash, which is suitable for all kinds of materials; Figure 3-20 (b), (c) plate has high critical flow rate and easy to wash, and is widely used in large-scale desulfurization equipment; Figure 3-20 (d) plate has high defogging efficiency, but its cleaning is difficult, and its use is limited.

3. Distribution direction and advantages and disadvantages of demister

The layout direction of mist eliminator is defined according to the direction of smoke passing through the cross section of mist eliminator, which is divided into vertical layout and horizontal layout. For a vertical demister, the components of the demister are placed horizontally, and the smoke flows vertically upward through the demister components, as shown in Fig. 3-21. The components of the horizontal flow demister are arranged vertically, and the smoke flow passes through the demister along the horizontal direction, such as the demister of the downstream grid packing absorption tower (see Figure 3-9) and the jet bubbling reactor (see Figure 3-10).

The advantages and disadvantages of the two layout methods of demister can be seen from Figure 3-21. In horizontal flow demister, droplets removed from flue gas flow downward along the plate groove, perpendicular to the smoke flow, while droplets captured by vertical flow demister flow downward along the wider side of the demister plate. Therefore, the horizontal flow demister reduces the possibility of secondary water entrainment from the liquid film on the stripping plate. Vertical flow defogging is reversible, especially when the droplets leaving the plate are small, even if the smoke velocity is relatively low, it is easy to be re-atomized into the used smoke. Therefore, the horizontal defogger has better defogging effect than the vertical defogger at higher flue gas velocity.