Kiln Shell

Kiln Shell

AGICO CEMENT can supply kiln shells of standard quality and thickness. Here, too, our extensive industry experience and process expertise enable us to develop tailor-made solutions for users according to their requirements. These materials can be used in fields such as mining, metal casting, cement and printing, and dyeing industries.

rotary kiln shell Description

The kiln shell is an important part of an industrial kiln, which refers to the shell structure surrounding the inner space of the kiln.
Kiln shells are usually constructed of refractory bricks, refractory castables, or other high-temperature refractory materials.
Its main function is to protect the kiln interior from the outside environment while maintaining a stable temperature inside the kiln and containing the material being processed.
AGICO CEMENT is committed to providing users with high-quality cement spare parts and cement equipment and has established friendly cooperative relations with customers in many countries and regions. With high-quality product quality and preferential prices, we have won unanimous praise and trust from users!

The significance of kiln shells in industrial kilns is mainly reflected in the following aspects:

As the outer layer of the kiln, the kiln shell plays the role of heat insulation and heat preservation to prevent heat from being lost to the outside.
It can effectively seal the inner space of the kiln and reduce heat loss, thereby maintaining a stable temperature environment and enabling the kiln to reach the required working temperature.

The kiln shell provides a space to contain and enclose the material being processed.
It prevents material from flowing or leaking inside the kiln and protects the kiln structure from corrosion or erosion of the material.

As the external structure of the kiln, the kiln shell plays an important role in supporting and maintaining the stability of the kiln structure.
It is able to withstand the thermal expansion and mechanical stresses generated inside the kiln, ensuring that the kiln maintains its structural integrity during operation.

The kiln shells can isolate the interior of the kiln from the external environment, prevent external substances and gases from entering the kiln, and reduce the impact of the emissions produced by the kiln on the environment.

rotary kiln shell

Customizable Diameter & Length

Customizable Shell Thickness

Customizable Raw Material

Kiln Shell Manufacturing Process

Depending on the drawing, AGICO will first select the right steel plate and then strictly follow the process of cutting—edge processing—coiling—groove machining—butt joint—welding—post-treatment.
AGICO CEMENT uses welding to connect multiple single-section kiln shells to reach the required length.
Afterward, some post-welding treatment is required, including non-destructive testing, heat treatment, pressure test, and other processes to ensure the high quality of the kiln shell.
Kiln shell manufacturing is a complex process that requires experienced engineers and technicians to operate.
Strictly follow the relevant safety regulations and manufacturing standards to ensure the safety and quality of the manufacturing process.

Kiln Shell Manufacturing Process

kiln shell material

In the construction of the kiln shell, many different types of materials can be used, depending on the type of kiln, the operating conditions, and the requirements of the material being processed. The following is a comparison of some common kiln shell materials and their characteristics and advantages:

Refractory bricks

Refractory bricks

Refractory castable

Refractory castable

Refractory Ceramic Fiber

Refractory Ceramic Fiber

Refractory Concrete

Refractory Concrete

rotary kiln shell parameters

Nominal capacity (tpd)

Dimension (mxm)

Refractory thickness(mm)

Power consumption(kW)

Installed power(kW)


Ø 4,0 x 59





Ø 4,2 x 60





Ø 4,4 x 64





Ø 4,6 x 64





Ø 4,8 x 72




Role of The Rotary Kiln Shell

The kiln shell in an industrial kiln serves several important functions that are essential for the kiln’s operation and the quality of the process it carries out. Here are the key functions of a kiln shell:

Structural Support: The kiln shell provides the necessary structural support to the kiln, ensuring its stability and integrity.
It withstands the mechanical forces and weight of the materials being processed inside the kiln.

Thermal Insulation: The kiln shell acts as a thermal barrier, preventing heat from escaping the kiln.
It helps maintain a controlled and uniform temperature inside the kiln, which is crucial for achieving desired chemical and physical reactions in the materials being processed.

Heat Transfer: The kiln shell facilitates heat transfer within the kiln.
It absorbs heat from the combustion process or external heat sources and transfers it to the materials being processed, promoting the desired reactions and transformations.

Containment of Materials: The kiln shell encloses the materials being processed, ensuring they remain confined within the kiln.
It prevents the materials from spilling or escaping during the firing or treatment process.

Protection against External Environment: The kiln shell acts as a protective barrier, shielding the internal processes from external elements such as weather conditions, dust, and contaminants.
It helps maintain a controlled and clean environment within the kiln.

Gas and Vapor Control: The kiln shell helps control the flow of gases and vapors within the kiln.
It ensures proper ventilation and gas circulation, which is crucial for maintaining the required chemical atmosphere or preventing the accumulation of harmful gases.

Emission Control: The kiln shell plays a role in managing emissions generated during the process.
It can be designed to incorporate gas-cleaning systems or exhaust ports to minimize environmental pollution.

Safety: The kiln shell contributes to the safety of kiln operation.
It provides a physical barrier that prevents accidental contact with high temperatures or hazardous materials inside the kiln.

Role of The Rotary Kiln Shell

kiln shell temperature

Kiln shell temperature refers to the measurement and monitoring of the surface temperature of the kiln shell, which is the outermost layer of an industrial kiln. It plays a critical role in the operation and performance of the kiln, as well as the quality of the materials being processed. Here is a detailed explanation of kiln shell temperature:

Kiln shell temperature can be measured using various techniques, including contact and non-contact methods.
Contact methods involve the use of thermocouples, which are inserted into the kiln shell at specific locations to directly measure the surface temperature.
Non-contact methods include the use of infrared pyrometers or thermal imaging cameras, which measure the temperature by detecting the infrared radiation emitted by the kiln shell surface.

Kiln shell temperature is not uniformly distributed across the entire shell surface.
Variations in temperature can occur due to factors such as heat generation from fuel combustion, heat transfer mechanisms, and the characteristics of the materials being processed.
Monitoring the temperature distribution along the kiln shell provides valuable insights into the kiln’s thermal behavior and helps identify any areas of concern, such as hotspots or temperature differentials.

Monitoring kiln shell temperature is crucial for several reasons:

  • Process Control: Kiln shell temperature directly affects the efficiency and performance of the kiln.
    By monitoring the temperature, operators can ensure that the kiln operates within the desired temperature range for optimal heat transfer and chemical reactions.
  • Refractory Performance: Excessive temperature can lead to refractory wear, spalling, or failure.
    Monitoring the kiln shell temperature helps evaluate the condition of the refractory lining and allows for timely maintenance or repair actions to be taken, preventing premature refractory damage and optimizing the lifespan of the lining.
  • Energy Efficiency: Monitoring the kiln shell temperature enables operators to identify areas of high temperature or heat loss, allowing for adjustments in the kiln’s operation to optimize energy efficiency and reduce fuel consumption.
  • Safety: Kiln shell temperature monitoring is essential for ensuring the safety of personnel and equipment.
    Excessive temperatures can pose risks, such as refractory failure or structural damage.
    By continuously monitoring the shell temperature, any abnormal temperature rise or hotspot can be detected early, allowing for appropriate interventions to prevent potential hazards.

The temperature data obtained from kiln shell temperature monitoring systems are typically collected and recorded by a data acquisition system.
This data can be analyzed and visualized in real time, allowing operators to monitor temperature trends, identify anomalies, and make informed decisions regarding kiln operation.
Additionally, advanced control systems can be used to automatically adjust kiln parameters based on the measured shell temperature, enabling tighter control and optimization of the kiln’s thermal performance.

rotary kiln shell material

kiln shell temperature monitoring system

Temperature Sensors: Kiln shell temperature monitoring systems use various types of temperature sensors to measure the surface temperature of the kiln shell.
These sensors can be installed at strategic locations along the shell, such as hot spots or areas prone to thermal stress.

Thermocouples: Thermocouples are commonly used temperature sensors in kiln shell monitoring systems.
They consist of two different metals joined together, and their voltage output changes with temperature.
Thermocouples provide real-time temperature readings that can be transmitted to a control system for analysis and monitoring.

Infrared Pyrometers: Infrared pyrometers, also known as non-contact temperature sensors, are another type of sensor used in kiln shell temperature monitoring.
They measure the surface temperature by detecting the infrared radiation emitted by the kiln shell. Infrared pyrometers can provide rapid and accurate temperature measurements without direct contact with the shell.

Data Acquisition System: Kiln shell temperature monitoring systems incorporate a data acquisition system that collects and records temperature data from the sensors.
This system can be connected to a control room or a computer-based monitoring system for real-time data analysis and visualization.

Monitoring and Control: The temperature data obtained from the kiln shell monitoring system is analyzed to assess the kiln’s thermal performance and identify any abnormal temperature patterns or hotspots.
This information is crucial for making adjustments to optimize the kiln’s operation, prevent damage to the shell, and ensure efficient heat transfer.

Alarm and Safety Features: Kiln shell temperature monitoring systems can be equipped with alarm systems to alert operators or control systems when the temperature exceeds predetermined limits.
This helps prevent potential hazards such as excessive thermal stress, shell deformation, or refractory failure.

Historical Data Analysis: Kiln shell temperature monitoring systems often include features for storing historical temperature data.
This data can be analyzed to identify long-term trends, evaluate the effectiveness of maintenance or operational changes, and facilitate predictive maintenance strategies.

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Rotary kiln shell maintenance and inspection

Regular Cleaning

Regular cleaning of the kiln shell surface will remove dust, residue, and chemicals and maintain a good working environment.
Be safe while cleaning, use proper personal protective equipment, and follow proper cleaning procedures.

Appearance inspection

Regularly inspect the appearance of the kiln shell to see if there are obvious cracks, damage, or deformation.
Particular attention is paid to joints, welds, and expansion joints of the kiln shell to ensure its integrity and stability.

Thermal stress analysis

The kiln shell will be affected by thermal stress at high temperatures, which may cause cracks or deformation.
Conducting thermal stress analysis can evaluate the bearing capacity and thermal stress distribution of the kiln shell to ensure its stability and safety at working temperature.

Refractory Lining Inspection

Check the condition of the refractory lining of the kiln shell to ensure its integrity and performance.
Inspect the lining for dislodgement, wear, or damage and repair or replace as necessary.

Temperature monitoring

Use a suitable temperature monitoring system to monitor the distribution and change of the kiln shell surface temperature.
This helps to detect abnormal temperature increases or hot spots early and take appropriate measures to prevent further damage.

Maintenance records

Maintenance personnel should keep detailed maintenance records, including information such as inspection dates, observation results, repair measures, and replacement parts.
These records help to track the maintenance history of the kiln shell and provide reference material.

Professional inspection and maintenance

Regularly invite professional engineers or technicians to carry out detailed inspection and evaluation of the kiln shell.
They can use advanced inspection equipment and technology to check the structural integrity of the kiln shell, thermal stress distribution, and refractory lining condition, and provide necessary maintenance suggestions or repair programs.

It should be noted that the maintenance and inspection of the kiln shell should be carried out under the premise of safe operation. Follow proper safety procedures and use personal protective equipment to ensure the safety of maintenance personnel. Additionally, the maintenance schedule and frequency of the kiln shell should be tailored to the specific kiln type, operating conditions, and usage. Regular maintenance and inspection can prolong the life of the kiln shell, reduce the risk of potential failure, and improve the reliability and efficiency of the kiln.

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