2.5×54m High Automation Lime Rotary Kiln in Metallurgy and Refractory Industry
Equipment Introduction:

Lime rotary kiln is the main equipment of lime production line. It is also used in many industries such as metallurgy, chemical industry, building materials, refractory, environmental protection, etc.

The rotary lime kiln consists of cylindrical shell, supporting device, supporting device of thrust roller, driving unit, movable kiln head, sealing device on the tail of kiln, coal dust pipe device, etc. The kiln body has a certain tilt angle.

The whole kiln body is supported by the roller supporting device, and it is also equipped with thrust roller device to control the up and down movement of the kiln body.
Features:

1. High Automation Level

The lime rotary kiln is with advanced structure. Its pre-heater with low-pressure loss can improve preheating effect efficiently. After preheating, the resolution ratio of the limestone can reach 20~25% when they enter into the kiln. Besides, the limestone with fine fraction about 10~15mm can be used directly.

2. Waste Heat Is Reused Effectively

The two sides of the reliable rotary kiln are sealed by the combined scales, which can make the air leakage coefficient less than 10%. Composite refractory materials should be used in order to reduce the loss of radiant heat.

3. Low Energy Consumption

The filling vertical cooler, round or square, can be zoned-ventilation, which can make the temperature of lime-stones in the cooler at about 80°C. As a result, it is very convenient to transport and store. It can also pre-heat the secondary air up to the temperature above 700°C, then the waste heat can be recycled to reduce energy consumption.

Working Principle:

The rotary kiln is a cylindrical vessel, inclined slightly to the horizontal, which is rotated slowly around its axis. The material to be processed is fed into the upper end of the cylinder.
As the rotary kiln rotates, material gradually moves down towards the lower end, and may undergo a certain amount of stirring and mixing.
Hot gases pass along the kiln, sometimes in the same direction as the process material (co current), but usually in the opposite direction (counter current).
The hot gases may be generated in an external furnace, or may be generated by a flame inside the kiln. Such a flame is projected from a burner pipe (or "firing pipe") which acts like a large Bunsen burner. The fuel for this may be gas, oil or pulverized coal.

Technical Parameters: