Rotary kiln is rotary calcining kiln and one of building material equipments. According to dealing with different materials, there are cement kiln, matallurgy chemical kiln and lime kiln.
Rotary kiln is the key equipment of cement clinker in dry-process and wet-process production line. Metallurgy chemical kiln is mainly used in iron ore magnetic calcination, silicon thermal refining magnesium, chromium nickel ore calcination, refractory calcination and active lime and calcined dolomite for steel mill and ferroalloy works.
The kiln is a cylindrical vessel, inclined slightly to the horizontal, which is rotated slowly around its axis. The material to be processed is fed into the upper end of the cylinder. As the kiln rotates, the materials gradually move down towards the lower end, and may undergo a certain amount of stirring and mixing. Hot gases pass along the kiln sometimes in the same direction as the process material (co-current), but usually in the opposite direction (counter-current). The hot gases may be generated in an external furnace, or may be generated by a flame inside the kiln. Such a flame is projected from a burner-pipe (or 'firing pipe') which acts like a large burner. The fuel may be gas, oil or pulverized coal.
Supporting device: advanced shaft structure, automatic temperature measuring device and electrical heating.
Catch wheel: including two kinds mechanical wheel and hydraulic pressure.
Gears: single or double. Control the rotating speed by buncher, DE machine and frequency variable motor. Be reliable, energy-saving, and efficient.
Cylinder type bolster: lower bolster has three types: fixed, zoom and floating. The structure is simple, replacement is convenient and won’t hurt cylinder.
Sealing equipment: there are many kinds for choice according to kiln models, including air cylinder edge sealing, spring edge sealing, and graphite block sealing and combination for above. The sealing effect is very good.
Kiln head hood: including stationary type and flexible type.