1156 posts
Re: Fuels
Eight per cent sulphur is very high and I don't know of any cement companies using petcoke of that sulphur content. This is likely to result in over two per cent sulphate in clinker and therefore the amount of gypsum that can be added in cement grinding will be limited. Possibly this coke could be used to produce mineralised clinker however extensive trials would be necessary.
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1156 posts
Fuels Question 12
Ours is ILC 5-stage pre-heater kiln with 3300t/day production capacity. Recently we have changed the kiln fuel from fuel oil to 100 per cent coal. The kiln torque in case of fuel oil firing used to vary between 28 and 38 on normal kiln running. After switching the kiln on coal, the torque figure remains between 6 to 11. The litre weight of the clinker remains between 1.35 where as on fuel oil the same varied between 1.22 to 1.28. Otherwise the operational parameters for kiln in both the cases are more or less same.
1156 posts
Re: Fuels
The composition of the coal has affected the melt content of your clinker. This is affecting the kiln torque because stickiness in the charge in the kiln has changed and is not climbing the rotating walls of the same extent. This also explains the increased density of the clinker. However, you are not suffering any other operational problems which is a good result with such a major change in operations. Congratulations!
1156 posts
Fuels Question 13
We have a problem related with high sand usage to make the consistent raw material mix. Sand addition for silica correction is roughly five per cent into raw material results roughly three per cent quartz content in the raw meal over 45 micron residue. Consequently the overall effect is frequent free lime formation in the clinker due to high quartz content in the raw meal, negatively effecting quality and high heat consumption in burning. In order to tackle with the problem following activities are already done
1. The burner pipe is replaced by a new design burner pipe with high momentum to improve burning and have stronger flame.
2. New coal dosing system is installed to have stable and accurate kiln fuel feed. Also with this system, we started to grind petcoke and other types of coal separately to facilitate burning. However the problem still persists.