Rotary Lime Kiln

Introduction of rotary lime kiln

The lime rotary kiln is widely used in the fields of building materials, metallurgy, chemical industry, environmental protection, etc. Lime rotary kiln can be divided into cement kiln, metallurgy chemical kiln and lime kiln according to the different materials processed.

It mainly consists of kiln body, sealing device for kiln tail, main and auxiliary driving device, burning device, discharging device, speed regulation, instrument control, PLC programming, interlocking device, and dust-extraction device, etc.

The lime rotary kiln is mainly used to calcine cement clinker; In the process of non-ferrous and ferrous metallurgy, such as iron, aluminum, copper, zinc, stannum, nickel, wolfram, chromium, etc. the rotary kiln can be used to sinter and roast ore, concentrate, intermedium, etc. The lime kiln is mainly used to calcine limestones.

Features of rotary lime kiln

1. The lime rotary kiln shell design fully take into consideration of the corner at shell flexible supporting to extend the lifetime of refractory bricks and castings.

2. Adopt supporting roller bearing with big diameter and the small ratio between length and diameter to improve the reliability. The bearing is automatic self-sliding bearing.

3. Sturdy structure, smooth running, large capacity.

4. The better sealing effect of new type open gear hood sealing type.

5. The spring lamination overlying type flexible sealing, double layer spring lamination sealing increase the heat insulation layer to improve the reliability and lifetime.

Working principle of rotary lime kiln

The lime rotary kiln is a cylindrical vessel, inclined slightly to the horizontal, which is rotated slowly about its axis. The material to be processed is fed into the upper end of the cylinder.

At first, preheat the limestone to above 800℃, they will start to compose, And then, they will be pushed into the kiln for further burning by the push rod actuator.  As the lime 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. Until the temperature reaches about 1200 ℃, materials cooled by the cooler, they will be discharged out.

Technical data