A draught of 15mm of water is produced by using a chimney of height 30m. The ambient air and flue gases are at 27^oC and 300^oC respectively. The coal burned on the grate contains 81% carbon, 5% moisture and remaining ash. Neglect the losses and assume values of burnt products equivalent to the volume of air supplied and for the complete combustion of fuel, find the percentage of excess of air supplied?
(a) 14.56%
(b) 52.89%
(c) 8.13%
(d) 20.002%
The question was asked during an interview.
The query is from Draught System topic in portion Steam Generators & Accessories of Energy Engineering
