I have calculated the total free convective heat loss,total forced convective heat loss and total radiative heat loss over 23m of the kiln surface. Assuming at least 50 % efficiency of the system, the equivalent fuel savings in a year were calculated and presented as follows:
Total operating hours of the kiln in a year 7000hrs
Heat available at the burning zone 3, 24,862.48 Kcal/hr
Total heat recovery of proposed run around system 1, 62,431.24 Kcal/hr
Calorific value of the fuel 55, 00 Kcal/kg
Equivalent fuel savings 29.533 kgs/hr
Equivalent fuel savings per year 2, 06730.7 kgs/year
I want to know the mechanism to utilized the heat around kiln so that we can save energy and cost.
Thank you Ariadne Tsambani for paper. It includes all those information that i was seeking.
If you intend to use the heat lost from the kiln to ambiance you should consider that it is at a quite low temperature so that you can use it only in preheating air for the burner or in an early stage of material drying process. In both situations you should first think about the way to capture it. this implies a space separated from ambiance around the kiln and through which you can pass air. In fact you have to build up a heat exchanger with the kiln as heat source. In case that you want to go to this solution I think that a hélicoïdal air mouvement would be the best solution in order to guide the air flow around the kiln.
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