Burning Question 67

What could be the minimum velocity of gases in down-comer duct? Our idea is to reduce velocity by increasing duct diameter, as much as possible so as to get lowest pressure drop across down comer duct.

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Re: Burning

I don't think there is a minimum velocity in the downcomer duct. You must draw the exhaust gases out of the kiln, but provided you do that adequately it does not matter at what velocity they flow down the downcomer duct. However, I'm not sure what you are going to achieve by this modification. The pressure drop across the downcomer duct is unlikely to be a limiting factor on your kiln. That limiting pressure drop will be elsewhere in the system.

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Burning Question 68

What are the additional facilities required to use petcoke of sulphur content around 8 per cent in a cement plant. Could you site some of the results of trial runs in cement plant using petcoke of eight per cent sulphur content.

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Re: Burning

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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