| ( 16 ) |
where CO 2 , O, CO, and N are the percentages by volume as determined by the flue gas analysis of carbon dioxide, oxygen, carbon monoxide and nitrogen.
The weight of flue gas per pound of dry coal will be the weight determined by this formula multiplied by the percentage of carbon in the coal from an ultimate analysis.
Fig. 20. Loss Due to Heat Carried Away by Chimney Gases for Varying Percentages of Carbon Dioxide.
Based on Boiler Room Temperature = 80 Degrees Fahrenheit.
Nitrogen in Flue Gas = 80.5 Per Cent. Carbon Monoxide in Flue Gas = 0. Per Cent
Fig. 20 represents graphically the loss due to heat carried away by dry chimney gases for varying percentages of CO 2 , and different temperatures of exit gases.
The heat lost, due to the fact that the carbon in the fuel is not completely burned and carbon monoxide is present in the flue gases, in B. t. u. per pound of fuel burned is:
| L' | = | 10,150 | × | ( |
| ) | ( 17 ) |
where, as before, CO and CO 2 are the percentages by volume in the flue gases and C is the proportion by weight of carbon which is burned and passes up the stack.