Contents

Rings Formation in the Cement kiln by Thamer HA M’tr

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AVOID RING FORMATION

Rings disrupt oven operation

-by forming obstacles to the steady progress of the material

-on the other hand, when the rings collapse, they give masses of matter into balls and can

Avoiding “avalanches” The oven material should be slowed down at this point (decreased kiln speed)

To reduce as much as possible the proportion of incuit.

* Formation and nature of the rings

-The chemical and microscopic analysis among other means of investigation allow to know the natures

Chemical and mineralogical constituents of the rings and make assumptions about where training

And so to find more easily ways to avoid their appearance

Sulphates play a preponderant role in the formation of rings and especially those located upstream of the

Cooking zone

-the sulfur is often in the form of pyrite-iron sulphate) or in the fuel

Remedy to the rings

Knowing causes causes ring formation can be a help in finding remedies

It is suggested:

– to select, if possible, the raw material (and the fuel) so as to use only that in the

Sulfur and chlorine is the lowest possible.

-to monitor the sulfur and chlorine levels at the base of the preheater

To avoid the return of too much cooler dust in the secondary air.

to increase the particle size of the flour in the measure obviously or its aptitude for cooking remains favorable

-to study the good adaptation of the clinker standards to a good operation of the oven

Another way to remedy the rings is to use refractory coatings which have a low bonding capacity.

Despite all precautions, it is not always possible to avoid the presence of a ring, It will then be necessary to resort

To the following method:

-variation of the temperature in the zone of the ring ..for example: by displacement of the nozzle

Thamer Mtir

Process & Energetic efficiency Expert