re Impact of ALKALY, SULPHURE and CHLORINE in Kiln operation and clinker quality ?

Hello GLT,

From the data you have provided the chloride in your system doesn't balance. There can only be two reasons;-

1. One or more of the analyses are in error.

or

2. There are other chloride inputs to the kiln feed which you haven't considered.

What is the source of the CKD you mention?  Is it raw meal bag house and/or gas conditioning tower dust?

Regards,
Ted.

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re Impact of ALKALY, SULPHURE and CHLORINE in Kiln operation and clinker quality ?

Hi Ted,

Thanks for your unflinching support.

Please concering this topic, in my plant we use S/A ratio and not A/S ratio. I hope since its molar saturation is still the same trend.

However, we had an experience, in the kiln feed we measured S/A 0.57

While in the clinker we had a sudden rise of S/A from 0.56 to 0.98 for 4 hours, then it started going down

what could be the cause and implication (Though am aware that 0.98 S/A is okay, but why the change in our normal range)

Thanks in advance

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re Impact of ALKALY, SULPHURE and CHLORINE in Kiln operation and clinker quality ?

Hello Haliff,

Yes, you are correct. The S/A ratio uses the same calculation method, it is simply the inverse of the A/S.

Sometimes the clinker sample can contain pieces of buildups from the smokebox/calciner, which are usually very high in alkalis and/or sulphur. This can skew your S/A ratio one way or the other from the normal value. How long the effect last for depends on how often these buildups are falling and the size of the pieces. Normally only one or two clinker samples are affected, but if large pieces of buildup are falling regularly over several hours you might notice this effect last longer.

Have a look at the SO3 and K2O of the clinker and plot how these are changing (compared to normal clinker values) when this type of event happens. Also, if the pieces of buildup passing through the kiln are large enough you may see the Free Lime and LSF  also spike up suddenly in these samples, due to the unburnt nature of the buildup material.

As long as these excursions in S/A are small, infrequent, do not affect kiln operation and have negligible influence on clinker quality, there should be no implications to be concerned about. However, if they become more frequent and start to affect clinker free lime or affect production, you may have to look into measures for reducing or preventing the buildups from forming. ie increase O2 in the kiln inlet or install blasters in the area of formation and blast regularly so the buildups do not become too large.

Hope this helps,

Regards,
Ted.

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re Impact of ALKALY, SULPHURE and CHLORINE in Kiln operation and clinker quality ?

Sir,

Our's is 5 stage pre-heater ILC kiln

we are using 100 pet coke as fuel

smoke chamber coating is formed really because of high DOC i.e 95 % or reduced atmosphere

in kiln inlet

thank you

msv

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