Impingement Dryer is made to impinge in a plug flow manner on a moving loosely formed bed of wet feed. It is suitable for well-aerated beds of preformed, crystalline or granular wet feeds. It also handles shear sensitive materials. It is used in menthol crystals, yellow iron oxide, pigment and organic crystals.

Impingement particulate removal device consist of a structure, such as baffles or chevrons, inserted in the flue gas flow that causes the flue gases to change direction a number of times. In operation, the flue gas changes direction and continues around the constituents that make up the structure while the particulate due to inertial forces, is impacted against the surface of the structure. Due to the fact that multiple changes in gas direction are used, there are multiple opportunities for the particles to impinge on the surface of the structure. The particles are then collected on the surface of the structure, or they drop to the bottom of the impingement separator where they are collected.