72 posts
Re: high free lime and liter weight
hello sir u r correct and now we have brownish clinker . but ower main problem now material collapse in the preheater after any 5 mints will happen it can observe it by changing in cyclones out let draft
notice that:
type of precalciner is: PREPOL
supplier by : polysius / thyssen kroup industerial india
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72 posts
Re: high free lime and liter weight
hello mr Ted Krapkat
1-we fucing sme time high free lime and litter wieght..
2-our fuel is using ,fuel oil (furnace)with calorofic value=10200kca/kg and 0%ash content and same fuel used in PC plus kiln main burner
3-LSF OF clinker=96.6%,SM
4-actualy there materials collapse in preheater after13-15mints (fine material)it can observed by changing in cyclones out let draft ad some time time we find some blockage in PCarea
4- we dont have alkalies or sulphate
84 posts
Re: high free lime and liter weight
Your clinker LSF appears to be very high.SM you have not mentioned.It would be desirable to bring down LSF gradually from your present level of 96.6 to 88 - 89.You need to redesign the raw mix as I mentioned earlier.
Regards
Bhaskar Agate
537 posts
Re: high free lime and liter weight
elwathig:
1-we fucing sme time high free lime and litter wieght.
The only way you can get high free lime and high litre weight coincidentally is for the clinker to be oversaturated in CaO yet at the same time, hard burned. In such a case no amount of burning will reduce the free lime, but if burned hard enough the clinker will become less porous and more dense, resulting in a high litre weight as well.
2-our fuel is using ,fuel oil (furnace)with calorofic value=10200kca/kg and 0%ash content and same fuel used in PC plus kiln main burner3-LSF OF clinker=96.6%,SM
I agree with Bhaskar, that a clinker LSF of 96.6 appears to be rather high. Especially since you mentioned that your rawmeal LSF was ~ 94.5. With a fuel having 0% ash, your clinker LSF, SR and AR should all be the same as that of the raw meal (providing of course that no other ash-containing wastes are added to the kiln after the raw mill). This discrepancy between raw meal and clinker seems a bit odd and may be clouding the issue somewhat.
If your clinker LSF really is 96.6 and zero ash is absorbed into the clinker, then this means that your raw meal would be hard to burn, even at a SR of 2.2.
This would force you to burn a lot harder in an attempt to reduce the high free lime. Higher burning zone temperatures would produce lower porosity clinker having a high litre weight. Without any ash, the excess free lime could never be reduced, even with prolonged high temperature burning. This combination would result in high free lime clinker with a high litre weight.
In addition, the higher burning zone temperatures could be causing instability in the degree of calcination of the hot meal which could change the physical properties of the hot meal, promoting occasional 'stickiness', resulting in your frequent blockages and surges.
As Bhaskar has already sugggested, a reduction in clinker LSF is recommended to address the high free lime issue. If your clinker LSF actually is 96.6, then you should first attempt to reduce it to say 94 and see what happens to your clinker free lime and to the frequency of the meal surges and blockages. You may have to reduce it even further if you see an improvement, until your clinker LSF is optimised as far as practically possible.
You should also probably look at why there is such a discrepancy between the LSF of your raw meal and clinker.
If you choose to follow these suggestions, please let me know how you went.
Best Regards,
Ted.