multiple hearth furnace

A Multiple hearth furnace also known as a vertical calciner, is used for continuous preparation and calcining of materials.

The multiple hearth furnace consists of several circular hearths or kilns superimposed on each other.

Its facilities include a cogeneration system, two multiple hearth furnaces for dried sludge incineration, and a recycled water plant.

Glenbrook's iron plant contains four multiple hearth furnaces (MHFs), four rotary kilns, and two melters.

The roaster consists of a refractory-lined cylindrical steel shell, with a large combustion space at the top and 2 to 4 hearths in the lower portion, similar to those of a multiple hearth furnace.

Calcination is carried out in furnaces or reactors (sometimes referred to as kilns or calciners) of various designs including shaft furnaces, rotary kilns, multiple hearth furnaces, and fluidized bed reactors.

Additional grinding, beyond that required for a multiple hearth furnace, is normally required to ensure that heat transfer to the material is sufficiently rapid for the desulfurization and oxidation reactions to occur in the furnace chamber.