Kiln Material Bypass

As for us we do have traditional by-pass. It is effective thing.

But I think that the way to start is alkali-sulphur-chlorine optimization first.

By-pass installation itself is not cheap!

I don't know your plant, but as rule the dust coming from the dedusting system at the end of the kiln line is rich in SO3 and Cl.

You can carry out this dust out of the process, is not too hot, and is easy to handle.

 Also this dust you can added to masonry cements as a Filler.

 This is a cheap way to take alkalies out of the system.

I hope this helps.

Best Regards

Germán

Wasting hot meal from the bottom stage cyclone will work just as well as wasting hot gas wth its load of dust and evaporated volatiles. What is important is that the material which is wasted contains the concentrated volatiles. This is why bypasses (of any description) are most effective for chloride - the chloride concentrates to a much higher degree than the sulphate.

From your hot meal SO3 and Cl levels it sounds to me as if your problem is high SO3 rather than chloride. 1% Cl in hot meal is not unusual. I would recommend that you optimise the combustion in your main burner to reduce SO3 volatility rather than wasting anything (gas or material) through a bypass.

Dr Michael Clark