Do yourself:
A heat balance for a continuous metallurgical process gives the following data:
| Heat input |
% of total |
| Combustion of fuel |
100 |
| Heat output |
% of total |
| Process requirements |
25 |
| Sensible heat in flue gases |
50 |
| Heat loss |
25 |
|
The installation of air preheater is being considered. It is estimated that the proposed preheater would recover one half of the sensible heat in the flue gases and would return to the furnace. Draw energy flow diagram in each of the following cases also
a) If the daily process requirements and daily heat loss are kept same, what percent saving in fuel could be achieved by the preheater installation? What would be the new heat balance (in percent) ?
b) If the daily fuel consumption and daily heat loss are kept same, what percent increase could be made in heat furnished to the process as a result of the preheater installation? What would be the new heat balance (in percent) ?
References:
Fine, H.Alan and G.H.Geiger: Handbook on Materials and Energy Balance Calculations in Metallurgical Processes
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