Kilns Question 5

We wish to know about oxygen enrichment in the cement kilns/precalciners. Please brief us about the expected merits and demerits. Are there any cement plants using this technique? If yes, then why is it not used commercially on regular basis in most of the cement plants.

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Re: Kilns

This is a big question! The merit is that the output of the kiln can be boosted by up to 15 per cent, the demerit is that the oxygen is expensive and therefore the costs of producing the additional clinker are higher. If market demand exists with good prices for cement then oxygen enrichment can be a good option. There are a number of kilns in the USA using oxygen enrichment of either the main burner or the precalciner. It is worth noting that CEMEX USA consider oxygen enrichment of precalciner firing to be their technology for which they have lodged a patent. You can find papers on oxygen enrichment in the proceedings of the IEEE conference in Vancouver 2001.

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Kilns Question 6

We frequently face with ball formation problem in the kiln for two months. We are studying the case and investigating the parameter changes. What are the possible reasons and the explanation of this phenomenon?

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Re: Kilns

There are two potential causes that I would investigate:
(i) a change orvariability in the MgO content of your kiln feed, and (ii) a change or rise in the Mn2O3 content of your kiln feed.

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