cement rotary kiln for dry and wet clinker production lines

Cement Rotary Kiln Overview

Cement rotary kiln is usually the core equipment in cement production line, which is widely used and plays a key role in large-scale dry and wet cement production process.
Cement rotary kilns are cylindrical in structure and are installed with a certain inclination angle to ensure that the materials can flow smoothly during the rotary process. Depending on the production process, cement rotary kiln can be used in dry or wet technology.

Features of Cement Rotary Kiln

• High temperature processing capacity: cement rotary kiln can withstand very high temperature, usually up to 1400 °C, suitable for high temperature calcination process.
• Uniform material handling: due to the rotation and tilting of the kiln body, the material can be uniformly heated in the kiln, avoiding localized overheating or unheating, ensuring the quality of clinker.
• High reliability: the rotary kiln has strong impact resistance and durability, the structure design is optimized to enable long-term stable operation and reduce the maintenance frequency.
• Wide adaptability: the kiln tilt angle, rotating speed and fuel type can be adjusted according to the production demand, adapting to different production processes and material characteristics.

Advantages of Cement Rotary Kiln

• Stable product quality: due to the uniform heating of the materials in the kiln, it can ensure the stable quality of cement clinker and avoid the unevenness that may occur in the traditional method.
• Energy saving and environmental protection: the use of new AC frequency conversion speed control technology, the main drive system can save electricity, improve energy efficiency, while reducing greenhouse gas emissions, in line with environmental requirements.
• Precise control: in the process of material handling, it can precisely regulate the temperature and heating time to ensure that the material reaches the state of calcination and improve the production efficiency.
• Optimized design: improve the structure of the kiln tail, solve the traditional rotary kiln in the return of material and dust leakage problems, improve the production environment.

Working Principle of Cement Rotary Kiln

1. Material feeding: raw material from the kiln tail (high end) chute into the kiln, due to the kiln body’s tilt angle and slow rotation, the material begins to roll along the direction of rotation, and gradually along the axis from the kiln tail to the kiln head (low end) movement.
2. Combustion process: At the kiln head end, the fuel is sprayed into the high temperature kiln through the burner, ignited and burned to provide enough heat. The heat is transferred to the material through radiation and conduction, and the calcination reaction starts.
3. Calcination process: The material is continuously heated during its movement in the kiln, and is transformed into cement clinker through several stages such as drying, preheating and calcination.
4. Discharge and flue gas treatment: The calcined material is discharged from the kiln head and enters the cooler for cooling. And the high-temperature flue gas flows out from the kiln tail end and is discharged after being treated by the dust removal system.

Application Fields of Cement Rotary Kiln

• Cement production: Cement rotary kiln is one of the core equipments in cement production line, which is mainly used to calcine raw materials such as limestone, clay, iron ore and so on into cement clinker, which is an important step in cement production.
• Clinker grinding: cement rotary kiln is not only used for calcining clinker, but also used to process by-products such as fly ash in some cases to make more efficient building materials.
• Chemical and metallurgical industry: besides cement industry, rotary kiln is also widely used in metallurgy, fertilizer, refractory materials and other fields to process various ores and chemicals.
• Environmental protection field: with the improvement of environmental protection requirements, cement rotary kiln is also used to treat sludge, waste incineration and other environmental protection projects, to reduce the emission of harmful substances.