17 posts
TimePosted 29/10/2008 11:33:28

### Re: Maximum SO3 Permissible

hi mr. Lalbatros;

What do you mean by  "enrichment" of Cl & SO3? You give values for 4 stages kiln but how can i calculate it for 5 stages kiln?

thank you

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138 posts
TimePosted 29/10/2008 12:21:52
lalbatros says

### Re: Maximum SO3 Permissible

The hot meal SO3 enrichment (w/r to clinker) is obtained by measuring the hot meal SO3 content and comparing it to the clinker SO3 content, and the same for Cl.

enrichSO3 = SO3(hot meal) / SO3(clinker)

It is convenient to define the enrichment with respect to clinker because this should not depend on the impact of the bypass, and this really probes what happens in the hottest region of the kiln. Of course, this is to be determined experimentally. This will not change too much as long as the burning conditions don't change too much !

The enrichment will depend on the chemistry, reducing or oxidizing conditions, and the alkalies/surfates ratio.

198 posts
TimePosted 30/10/2008 12:08:47
Raj Sahu says

### Re: Maximum SO3 Permissible

Dear Mr.Lalbatros,

As per your formula for calculating enrich SO3 of 4 for a 4 stage preheater kiln seems very high.I have experience of 100% petcoke fired kiln operation,we found that whenver we go beyond enrich SO3 of more than 2,process build-up tendency increases.In my view for smooth operation enrich SO3 should be maintained less than 2.

With kind regards,

R.M.Sahu,

India

138 posts
TimePosted 30/10/2008 12:26:17
lalbatros says

### Re: Maximum SO3 Permissible

Yes you are right, 2 is a more common value.
Looking in my files, I found several plants with values around 2 and even a little below.
However, these data are about 10 years old.

I suggested a value of 4 because I looked at two very recent examples, the value were 3 and 9. For the second case, the meal is hard to burn and tyres are increasing the cycles.