| The dry process rotary kiln, especially the large precalciner kiln, heat recovery efficiency of more than 60% efficient cooling and burning the mouth of the full and once the wind was relatively small multi-channel pulverized coal injection and rotary kiln kiln head and kiln hood strengthen containment and insulation, therefore, the clinker from the kiln temperature up to 1400 ° C, the kiln secondary air temperature can be as high as 1200 ° C, resulting in the system within the transition zone, firing zone, with cooling and the kiln door cover, cooler the high temperature zone and outside of the burner and other parts of the operating temperature is much higher than traditional kilns.
Therefore, the choice of the kiln lining is very important, direct impact on the life of the rotary kiln.
A firing zone normalizing points can be used to direct binding of magnesia-chrome bricks, special Magnesia or dolomite brick.
2, on both sides before and after normalizing points, depending on the equipment, operation, and the raw material and fuel, can be used with the same normalizing point brick or ordinary magnesium chrome brick.
3, the transition zone can be the main use of the spinel brick, rich chrome magnesia brick or zirconium-containing toughening dolomite brick.
The kiln discharge port liner is one of the weakest link in the lining of the large kiln, where available silicon carbide brick silicon Mo brick,, spinel brick or direct-bonded magnesia chrome brick. Lower the temperature of the kilns, the kiln can use the excellent thermal shock resistance, high alumina bricks, or phosphates combined with high alumina bricks; if you can use the deformation of corundum of kilns or steel fiber reinforced high corundum castable low cement type aluminum casting material. |
ARTICLES