kiln seal

kiln seal

what is kiln seal

The kiln seal finds widespread application across industries including cement, building materials, metallurgy, mining, petroleum, and chemicals.
We provide various types of cement spare parts and cement equipment and have specially built high-quality cement plant equipment for users over the years.
Among the various types of kiln seals available, the fish scale sealing method stands out as the most commonly employed.
This sealing technique utilizes a specialized semi-flexible material renowned for its high-temperature resistance and durability, incorporating elements such as heat-resistant steel fish scales, carbon-silicon-aluminum composite panels, and standard steel fish scales to effectively seal the rotary kiln and ensure efficient operation.

A kiln seal is a mechanism used to prevent the escape of heat, gases, and materials from industrial kilns, which are large ovens or furnaces used for processes such as drying, baking, or firing materials like ceramics, cement, or ores.
The seal helps maintain the desired conditions inside the kiln, ensuring efficient operation and product quality.
It can be a physical barrier or a combination of materials designed to withstand high temperatures and pressure, effectively sealing the kiln’s openings.

AGICO CEMENT Spare Parts Customizable, According to Clients’ Drawings, Now Inquire!

Rotary Kiln Seal Benefits

  • Cost Savings:
    Reduced ID Fan HP consumption by 99% elimination of atmospheric air-in leakage.
    Reduced burner natural gas fuel consumption by 99% elimination of atmospheric air-in leakage.
  • Improved Production:
    Better burner control by eliminating varying temperature air-in leakage.
    Creating stable temperature conditions by eliminating varying temperature air-in leakage.
  • Improved Environmental Conditions:
    Reduced internal equipment dusting due to the elimination of turbulent outside airflows.
    Cleaner external grounds and buildings due to reduced material leakage.

Rotary Kiln Sealing System

A rotary kiln needs kiln supporting rollers for support, and kiln tire rings or girth gears drive the rotation.
Because it is supported by the kiln support roller and its rotation characteristics, there will be a certain gap between the rotary kiln and the connection parts with other production devices, to prevent it from rubbing against the production devices connected to it during the rotation process.

Some industries do not have many requirements for these gaps.
For example, in some industries that use single-cylinder coolers, the cooling machine is used to cool materials.
If the process conditions are good, gaps can also play a role in heat dissipation, but most rotary kilns do not allow gaps at the inlet and outlet.
Gaps will affect air leakage, air intake, ash leakage, and heat loss.
Therefore, it is necessary to seal these gaps to prevent air leakage, air intake, and ash leakage.

Rotary Kiln Sealing System

Types of kiln seal

There are probably the following categories of rotary kiln seals:

  • Fish Scale Seal
    Fish scale sealing is the most mainstream sealing form at this stage.
    Because of its easy installation and maintenance, and good sealing performance, it can be used for both rotary kiln inlet sealing and rotary kiln outlet sealing.
    It is widely used in dryers and single-cylinder coolers.
    Taking the cement industry as an example, the kiln head of the rotary kiln is sealed with fish scales, and the proportion of fish scales used for the kiln tail seal is relatively large.
    Other industries such as metallurgy, building materials, chemical industry, and other industries use a large proportion of fish scale seals.
  • Graphite Block Seal
    The graphite block seal can be used for the kiln outlet seal and the kiln inlet seal.
    The old-fashioned graphite block seal adopts the axial sealing method, which is the same as the cylinder seal.
    Due to its certain defects, there are not many units currently used.
    The new graphite block seal with the radial sealing method will be the development direction in the future.
  • Cylinder Type Seal
    Cylinder-type seals are mainly used for the sealing of rotary kiln tails for the production of powder and granular materials and are generally used in the cement industry.
    All have been transformed into the form of the fish scale seals.
  • Labyrinth Seal
    The labyrinth seal is a labyrinth form composed of multiple annular baffles with different diameters.
    The combination form of the labyrinth seal and the fish scale seal and the combined form of sealing with graphite blocks is also used in some rotary kiln projects.

Kiln Seal Installation Procedure

First, you should weld a stereo flange 600mm larger than the cylinder, the excircle of the stereo flange welding to the adapter sleeve, the other end of the adapter sleeve welding to the vertebral flange, and the below end of the connection joint is an ash collector to prevent the seal from crushing by deposition.
Then, weld a friction sleeve on the right spot of the cylinder. Install the bottom layer’s wear-out resistance plank.
Fix it on the vertebral flange by bolts. Friction-seal one end of the plank with a friction sleeve. The friction angle is better in surface friction.
Put the composite board on a wear-out resistance plank according to the position of the holes.
Don’t fix them by bolts until the prevent board is installed. Put a steel wire rope and pothook every meter.
Find the right place on the two sides of the cylinder then weld counterweight supports. Roll wire rope one and a half-circle around the cylinder and hang a weight on it.

High Quality Cement Spare Parts Provider- AGICO CEMENT

AGICO CEMENT, a leading cement equipment manufacturer based in China, specializes in providing high-quality equipment for the cement production line along with related spare parts at competitive factory prices.
Among our top-selling products is the rotary kiln, and we offer all parts tailored to your specifications or drawings, including kiln tire rings, girth gears, kiln support rollers, kiln thrust rollers, and more.

With a strong emphasis on quality and backed by extensive experience, we have successfully exported complete production lines and individual cement equipment to various countries worldwide, including Canada, Kenya, India, the USA, Ecuador, the UK, Iran, and many others.

Related Products

Kiln Support Roller

Kiln Support Roller

Kiln support rollers are essential components in industrial kiln systems.

kiln thrust roller

Kiln Thrust Roller

The thrust roller is responsible for supporting the weight of the kiln and maintaining its axial alignment.

kiln tyre

Kiln Tyre

Kiln tires are manufactured using high-quality alloy steel or cast steel, known for their strength, hardness, and heat resistance.

kiln girth gear

Girth Gear

The girth gear is a large gear ring that encircles the kiln’s circumference and is mounted on the kiln shell.

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