Cement rotary kiln is mainly used for calcining cement clinker, which is divided into two categories: dry process cement kiln and wet process cement kiln. Cement rotary kiln is widely used in metallurgy, chemical industry, building refractory materials, sanitation and other industries. Cement rotary kiln is a kind of calcination equipment, which needs to be heated during operation. Generally, there are two heating methods for cement rotary kiln, one is internal heating and the other is external heating.

The material of the internally heated rotary kiln is in direct contact with the flame and flue gas, and can be adjusted to achieve oxidation or reduction in the furnace. The inner wall of the barrel is built of refractory bricks. The head and tail liner are lined with high-strength wear-resistant castables. Between the flexible seal, can prevent dust and leakage. Multi-level support can be adopted to make the barrel length reach 60 meters, and the use temperature can reach 1600 ℃. The output is large, and the applicable fuels are liquefied gas, natural gas, coal gas, fuel oil, coal powder, coal, etc.

The material of the externally heated rotary kiln is not in direct contact with the flame and flue gas. The heat source is between the heating furnace and the cylinder body. The material is heated by heat transfer of the heat-resistant steel cylinder wall. The heating furnace is lined with refractory fiber, which can save energy and reduce consumption. Limited by heating method and barrel material, the length of the barrel is generally ≤15 meters, and the heating temperature is ≤1200 ℃. The output is small, and the applicable heating methods are: electric heating, gas, oil, coal, etc.