142 CALORIFIC POWER OF FUELS. 



also that one tenth of the C is burned to CO, and nine tenths 

 to CO a ; that the air supply is 20 per cent in excess of that 

 required for this combustion ; that the air contains one per 

 cent by weight of moisture ; and that the S in the coal may 

 be considered as part of the ash. We then have the follow- 

 ing synthesis of results of the combustion of 100 pounds of 

 coal: 



O from N = Total rr . rr . n 



Air. O X H. Air. - H ' 



59.85 Ibs. C to COa X 2f 159.60 534.31 693.91 219.45 



6.65 " C to CO X ii 8.87 29.70 38.57 15.52 



3.50 " H to H 2 O X 8 28.00 93.74 121.74 31.50 



196.47 657.75 854.22 



1.05 " H to H 2 O ) 

 8.40 " H to H 2 O \ 



10.00 " Water 10.00 



i. oo " N i. oo 



9.55 " Ash and S 



100.00 



Excess of air 20 per cent. 39-29 131.55 170.84 



1025.06 



Moisture in air i per cent. 10.25 



Total wt. of gases, 1125.67 = 39.29 790.30 219.45 15.52 61.20 



Total dry gases, 1064.56 



O N C0 2 CO 



Total dry gases, by weight, % 3.69 74.24 20.61 1.546 



Total dry gases, by volume, % 3.508 80.656 14.252 1.584 



Total gases 1125. 76 -fash and S 9.55 = 1135.31 total products. 



Total air 1025.06 -f- moisture in air 10.25 + coal 100= 1135.31. 



Dry gas per pound coal 10.6456; per pound carbon = 10.6456 -5- 665 = 16.008. 



Dry air per pound coal 10.2506; per pound carbon = 10.2506 -5- 665 = 15.414. 



Computation of the weight of dry gas and of air per pound C: 



Formula A : 



Dry gas per pound C = 14.252X11 + 3.508X8 + 82.240X7 = lfi Qo8 



3(14.252 + 1.584) 



Formula B : 



Air per pound C = 5.8 

 The error in the last result is 15.414 13.589 = 1.825 pounds. 



