Tongli rotary kiln sealing device Introduction

Rotary kiln sealing refers to the mechanisms and components used to seal the various openings and joints in a rotary kiln. Rotary kilns are large, cylindrical industrial furnaces that are used for a variety of processes, such as cement production, lime calcination, and other high-temperature thermal treatments. Effective sealing is crucial for maintaining the proper operating conditions within the kiln and preventing the leakage of gases, heat, and materials. Tongli, as a professional rotary kiln parts supplier, provides various types of rotary kiln sealing with different specifications and mechanisms for example we have mechanical and sealing like labyrinth sealing and material sealing life ceramic fiber sheets. We have specialized equipment that is only used to manufacturer rotary kiln, for example we have a 6.5x6.5x20m annealing furnace and also 6.5x6.5x20m sandblasting room that we are able to do the annealing of the rotary kiln by whole and the sandblasting as well. We have integrated the cutting-edge technology into our equipment design.

Tongli rotary kiln structure

A rotary kiln is a large cylindrical vessel used for a variety of processes, such as drying, calcination, and chemical reactions. It's commonly used in industries like cement production, lime manufacturing, and more.

Shell: The main cylindrical body of the rotary kiln is called the shell. It is typically made of steel and lined with refractory materials to withstand high temperatures and chemical reactions. The shell is inclined slightly from the horizontal and rotates on its axis.

Riding Rings and Rollers: The shell is supported by a set of riding rings and rollers. The riding rings are large rings that encircle the shell at various intervals along its length. The rollers, placed between the riding rings, support the weight of the kiln and allow it to rotate smoothly.

Tyres (Tires): Tyres are large, circular steel components that are attached to the shell. They usually have a conical shape to provide support and help distribute the load evenly. Tyres are sometimes fitted with riding pads to further reduce friction and wear.

Girth Gear: The girth gear is a large ring gear that is attached to the shell and meshes with a pinion gear. This arrangement drives the rotation of the kiln. The girth gear is often supported by trunnion rollers to maintain proper alignment.

Pinion Gear: The pinion gear is a smaller gear that meshes with the girth gear. It is usually driven by a motor through a gearbox, which imparts the rotational motion to the kiln.

Rotary kiln thrust roller：The thrust roller is a critical part of the rotary kiln system. It serves the purpose of supporting the kiln's weight and maintaining its axial position, ensuring that the kiln remains properly aligned along its axis. The thrust roller is typically positioned on the downhill side of the kiln and is attached to the kiln shell. It consists of a central shaft or journal and a roller assembly.

Supporting Rollers: Supporting rollers are additional rollers placed along the length of the kiln to help prevent excessive deflection of the shell due to thermal expansion and other forces. They play a crucial role in maintaining the kiln's stability and alignment.

Refractory Lining: The interior of the kiln is lined with refractory materials to protect the shell from the high temperatures and chemical reactions occurring inside. Different sections of the kiln might have different types of refractories to withstand varying conditions.

Design principles of cement rotary kiln sealing device

Kiln Inlet Seal: This is the point where materials enter the rotary kiln. The inlet seal prevents ambient air from entering the kiln and disturbing the controlled atmosphere required for the process. It also helps contain heat and gases within the kiln.

Kiln outlet Seal: This is where the processed materials exit the rotary kiln. The outlet seal prevents hot gases and materials from escaping into the surrounding environment and helps maintain temperature and pressure control.

Kiln joint Seals: Rotary kilns are made up of various sections that are connected by joints. These joints can be potential areas for heat and gas leakage. Sealing mechanisms, such as flexible metal seals, fabric seals, or combination seals, are used to prevent leaks at these joints.

Inspection Hatches and Ports: Rotary kilns often have inspection hatches and ports that allow operators to monitor and maintain the interior. Sealing these openings is important to prevent heat and gas leakage during operation.

Flexible Seals: These are often made of materials like rubber or elastomers and provide a flexible barrier against gas and heat leakage. They are suitable for areas where there is some movement or misalignment.

Fabric Seals: Fabric-based seals are used for joints and areas where a flexible, heat-resistant material is required to prevent leakage.

Metal Seals: These are rigid seals often made of metal and are used in areas where high-temperature resistance and a secure seal are needed.

Combination Seals: Some sealing mechanisms combine different types of seals to provide comprehensive protection against leaks.

Specifications of cement rotary kiln sealing device

Note: *The diameter is the inner diameter, Weight excludes refractory material.

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Zhejiang Tongli Heavy Machinery Manufacturing Co., Ltd (Formerly known as Tongxiang Coal&Mining Machinery Factory) established in year 1958 is a member of the Chinese National Building Material Machinery Association. Tongli is on the vendor list of designated production enterprise of the Ministry of Coal Industry. ISO9001、ISO14001、ISO45001 certified, accredited as High-tech & new technology enterprise of Zhejiang Province. With 65+ years of experience, Tongli has earned first class R&D and manufacturing capabilities, dedicated to provide satisfactory manufacturing equipments for global customers.   

Industry Knowledge extension

What is the step Prior to the rotary kiln calcination?

The first step of making cement is the raw material crushing, conveying and storage. The limestone raw material from the mine needs to be crushed, ground and mixed, and the crushing process is carried out by cement crusher. When the maximum size of the input ore is ≤1600mm and the output particle size is ≤80mm, the limestone discharged from the crusher is then sent to the Φ80m circular pre-homogenization yard by the belt conveyor for pre-homogenization and storage.

What is the relationship between vertical roller mill and rotary kiln?

The rotary kiln is usually used as an intermediate process. The large raw materials are crushed by the crusher and then enter the grinding equipment for grinding. After being mixed with other raw materials, they are added to the rotary kiln for redox reactions. The calcined finished products need to enter the vertical roller mill or ball mill for secondary grinding to get the finished product.