Direct Fired Rotary Kilns

Rotary kilns are used for high-temperature thermal processing of mineral concentrates.

• Rotary kilns are designed with specific refractory linings to suit the process requirements.
• Kiln burners are tailor design through a partner company to specifically meet the process requirements.
• Rotary kilns have specific sizes and configurations to suit the high-temperature process.
• Burner types range from gas, liquid fuels (LFO or HFO) through pulverised fuels such as sawdust, pet coke and various grades of coal

Description

A rotary kiln is a type of industrial equipment that is used to heat materials to high temperatures in order to cause a physical or chemical change in them. The kiln is a large, cylindrical vessel that is inclined slightly from the horizontal and rotates slowly on its axis.

Rotary kilns are used in a variety of applications, including:

1. Cement production: In the cement industry, rotary kilns are used to produce clinker, which is the main ingredient in cement.

2. Lime production: Rotary kilns are used to produce quicklime, which is used in a variety of applications, including steelmaking, water treatment, and soil stabilization.

3. Calcination of minerals: Rotary kilns are used to calcine a variety of minerals, including bauxite, magnesite, and kaolin.

4. Waste incineration: Rotary kilns are used to incinerate hazardous waste, medical waste, and municipal solid waste.

The basic design of a rotary kiln consists of a cylindrical shell that is supported by two or more rollers. The shell is lined with refractory material to protect it from the high temperatures inside the kiln. The material to be processed is fed into the top of the kiln and gradually moves down towards the bottom as the kiln rotates.

The temperature inside the kiln can reach up to 3000°F (1650°C), and the residence time can be several hours or even days, depending on the application. The rotary motion of the kiln ensures that the material is evenly heated and processed.

In addition to the basic design, rotary kilns can be customized with various features, such as:

1. Burners: Different types of burners can be used to provide heat to the kiln, including gas burners, oil burners, and solid fuel burners.

2. Seals: Rotary kilns require seals to prevent heat loss and to prevent air from entering the kiln. Different types of seals can be used, including graphite seals, metal seals, and inflatable seals.

3. Control systems: Modern rotary kilns are equipped with sophisticated control systems that monitor and adjust the temperature, speed, and other parameters of the kiln to ensure optimal performance.

Overall, rotary kilns are an important piece of equipment in many industrial processes. They offer a reliable and efficient way to heat materials to high temperatures and to achieve the desired physical or chemical changes.