Performance Characteristics of New Dry - process Rotary Kiln

The new dry-process rotary kiln, especially the large-scale precalcining rotary kiln, uses the high-efficiency cooler with the heat recovery efficiency above 60% and the multi-channel coal burner with sufficient combustion and less primary air ratio, and the rotary kiln head and kiln cover also strengthen the closed and insulated. So that the rotary kiln clinker temperature can be as high as 1400 ℃, into the rotary kiln secondary air temperature can be as high as 1200 ℃, resulting in the system transition zone, firing zone, cooling zone and the kiln door cover , cooler high temperature zone and the burner and other parts of the working temperature is much higher than the traditional rotary kiln.
Therefore, the choice of rotary kiln lining material is very important, directly impact on the life of rotary kiln.
First of all, should pay attention to the rotary kiln firing zone can be used directly with the right ignition point magnesium chrome bricks, special magnesia brick or dolomite brick.
Followed by attention to both sides of the rotary kiln normalizing point before and after, depending on equipment, operation and the original fuel situation, can be used with the same point of normal brick or ordinary magnesia brick. Then there is the transition zone with the main rotary kiln can use spinel brick, chrome-rich brick or zirconia toughened dolomite brick.
Finally, should notice the lining of rotary kiln discharge outlet is one of the weakest link for largest rotary kiln lining, where you can use silicon carbide brick, silicon Mo brick, spinel brick or directly bonded magnesia chrome brick. For the rotary kiln with low temperature of kiln outlets, high-alumina brick or phosphate-bonded high-alumina brick with good thermal shock resistance can be used; if the rotary kiln is deformed, can use corundum or steel fiber reinforced corundum castable or low Cement type high aluminum castable.

Now with the development of science and technology, rotary kiln technology is the rapid growth, rotary kiln R & D is also continuous progress, more and more cement plants began to use new dry-process rotary kiln to produce cement clinker.