When it comes to maintaining your rotary kiln and extending its life, all the kiln parts and components play a critical role – but few are more important than the refractory bricks lining the kiln’s interior. These bricks are necessary for shaping the heat envelope within the kiln, as well as protecting everything on the kiln’s exterior from the internal heat and pressure.
If the refractory bricks ever become damaged or begin peeling away from the inner shell, it will quickly degrade the operation of the kiln. The heat envelope will become unpredictable, affecting the quality of products created within the kiln. The escaping heat will also quickly begin to damage or deform the kiln shell. Therefore, it’s critical to protect the refractory bricks to extend the life of your rotary kiln.
Three Sources of Damage to Refractory Bricks Within Rotary Kilns
1 – Rapid temperature shifts
Due to the incredible heat that refractory bricks have to deal with, they should never be pushed to heat up or cool down too quickly. This can bring about thermal shock, and lead to the bricks cracking or peeling away from the shell. Any time they rapidly change temperature, more damage will be done.
So, kiln operators should always be aware of the potential for damage here. Allow your kiln to slowly heat up, or cool down, to extend the lifespan of the bricks.
2 – Mechanical stress
Ideally, when the kiln rotates, it should rotate as smoothly and cleanly as possible. This is desirable for many reasons – including protecting the refractory bricks. Uneven rotation, such as if the kiln shell has become warped, will put a lot of extra stress on the bricks. Those near to the warped area of the shell may crack or peel off. Besides harming the kiln, it will also accelerate damage to that area of the shell.
This is just one of the reasons that your kiln should be regularly measured and balanced.
3 – Frequent fuel changes
As you burn fuels within your kiln, it produces flue gasses and other byproducts that coat the bricks. If too many different kinds of fuel are burned, this can create irregular coatings on the bricks – or possibly create other adverse effects. As much as possible, keep your fuel sources consistent so that the bricks receive predictable exposure to the fuel byproducts.
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