Hammer/Anvil

Collection plates are rapped by a number of methods. One rapper system uses hammers mounted on a rotating shaft, as shown in Figure. As the shaft rotates, the hammers drop (by gravity) and strike anvils that are attached to the collection plates.

Rappers can be mounted on the top or on the side of collection plates. European precipitator manufacturers use hammer and anvil rappers for removing particles from collection plates.

Rapping intensity is controlled by the weight of the hammers and the length of the hammer mounting arm. The frequency of rapping can be changed by adjusting the speed of the rotating shafts. Thus, rapping intensity and frequency can be adjusted for the varying dust concentration of the flue gas.