Learn more about kiln maintenance training

There are materials that require heating right before usage. The high temperature allows them to gain desirable properties such as fluidity during processing. In industrial settings, large amounts of materials may need to undergo this type of process and thus a suitably massive kiln is called for. Size is not the only concern. These will often have to move in order to mix the contents and ensure uniformity. Some are shaped like a cylinder and their movement is rotation, usually while slightly inclined with respect to the ground. Various designs have been developed to achieve the desired results. rotary kiln maintenance training is vital in prolonging the lifespan.

Learn more about kiln maintenance training

How a rotary kiln Works


This cylindrical vessel can be found indoors or outdoors. It is mounted on a platform that has mechanisms that help it stay inclined and facilitate its movement around its axis. The top part can be opened as this is where the material is fed to the large container. As this spins, these this naturally slide down to the bottom where the heating element is located. The flame heats up the material, causing it to liquefy in most cases or at least stay in a more fluid state. Cement is a good example. Almost everyone will have seen cement trucks in a construction site.


Parts of a Rotary Kiln


This machine has undergone several redesigns since its invention in 1873. However, the main parts have remained including the kiln shell, the refractory lining, the drive gear, the internal heat exchangers, the tyres, and the rollers. The shell has a thickness of up to 3cm and is generally made out of a steel plate. This is rolled into a cylinder with the longest being 230m in length and the thickest being 6m in diameter. The lining, on the other hand, is there to provide insulation from the heat. The steel plate does not get too hot thanks to this layer.


The drive gear is responsible for the slow rotation along the axis. It is connected to an electric motor with variable speed. Due to the weight of the kiln, this should have a high starting torque to initiate movement -- hundreds of kilowatts is normal. Heat exchangers can get the job done through radiation, convection or conduction. The last one is considered as the most efficient while the first is known to be the least. The tyres can be found around the shell and are responsible for guiding the cylinder as it rotates.