kiln shell heat recovery
I have 2 questions on cement rotary kiln shell heat loss:
1. I have seen literatures claiming that kiln shell heatloss can be reduced massively by adding a stainless steel or aluminium jacket (Engin&Ari, 2004, Energy Conversion and Management, 46 (4), 2005, 551-562). Has anyone seen this done in commercial scale? Will the reduced heatloss results in very high shell temperature?
2. I believe the best solution to reduce kiln shell heatloss is still on refractories, but how far can it go? i.e., what is the lowest shell temperature one can get in a cement dry rotary kiln? Can it go down to <200oC?
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Re: kiln shell heat recovery
- Yes, the heat loss can be reduced, but the impact on the refractory lining must be considered. This relies on the external air cooling of the shell. A temperature gradient is established in the refractory lining which limits penetration of the lining by the fluxes in the kiln. Use of a jacket has not been done on a commercial scale due to the likely failure of the refractory lining of the kiln.
- Certainly refractory lining is the best means to reduce heat loss from the shell of a cement kiln. The limits depend on the the thickness of the lining, the lining material conductivity, its refractoriness, etc. You could achive <200 degrees C throughout the length of the rotary section of the kiln, but the lining thickness required would significantly reduce the internal volume of the kiiln and therefore the clinker production rate.