1156 posts
Re: Fuels
The rings you describe must be ash rings formed where the ash from the different alternative fuels combine with the charge in the kiln. It is not uncommon for coating and rings to form at that point in the kiln. As there are three distinct rings I suppose than the different alternative fuels have different aerodynamic properties in the kiln, or different delivery systems injecting them into the kiln and this is causes the ash to combine at different positions. If that is the case I would adjust the different fuel injection velocities to try to even out the coating. I am not aware of are fractory solution to this type of problem in the lower transition zone. I suggest you contact David Shepherd of Ceram Research who will know if such a solution exists, david.shepherd@ceram.co.uk.
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1156 posts
Fuels Question 10
We are manufacturing white cement. Previously we used oil fuel, now gradually we have switch over to petcoke and nowadays we are using almost 85 per cent of petcoke and 15 per cent of LSHS oil as a fuel. After this we are facing a problem that clinker is not coming out in a nodular form and it is almost in dusty condition. Kindly suggest that what corrective or preventive measure should be taken for getting the clinker in the nodular form from the Kiln.
1156 posts
Re: Fuels
This problem of the clinker dusting with the conversion to petcoke firing has been reported from a number of Indian cement factories. I think you will find that your Grasim South factory at Reddipalayam is suffering similar problems. This has prompted me to research the problem and the TechForum article in the April issue of ICR will be based on this topic. From my research it seems that the excess sulphate in the clinker flux reduces the viscosity and surface tension of the liquid phases in the kiln. The sulphur content in the petcoke is causing the breakdown of the clinker nodules. With grey cement I would suggest increasing the melt content of the clinker, however with white clinker this is not possible. My only suggestion is to increase the alkali content of the clinker by addition of feldspar to the mix. his should combine the sulphur as alkali sulphate and solve the problem. Unfortunately nodulising the clinker before the cement mill will not solve your problem and will only increase your manufacturing costs.
1156 posts