Page 475 - Boiler_Operators_Handbook,_Second_Edition

460 Boiler Operator’s Handbook

Appendix L

Combustion and Efficiency Calculation Sheets

The combustion calculation sheet on the following page The first requirement for an accurate analysis is an “ul-
provides a means for comparing two fuels for their air to timate analysis” of the fuel to provide the data to fill in
fuel ratio requirements and percent moisture in the flue the box on the top right of the combustion calculation
gas. Those values are then used in the boiler efficiency sheet. If you’re firing a gas fuel and receive a volumetric
calculation that follows. analysis these first two worksheets below can be used
to produce an ultimate analysis.

Constituent % Vol Mol. Wt. Density #/C cu.ft. % by Wt.
Methane (CH ) 16.0400 0.0424
4
Acetylene (C H ) 26.0400 0.0697
2 2
Ethylene (C H ) 28.0500 0.0746
2 4
Ethane (C H ) 30.0700 0.0803
2 6
Propylene (C H ) 42.0800 0.1110
3 6
Propane (C H ) 44.0900 0.1196
3 8
Butylene (C H ) 56.1000 0.1480
4 8
Butane (C H ) 58.1200 0.1582
4 10
Pentene (C H ) 70.1300 0.1852
5 10
Pentane (C H ) 72.1500 0.1904
5 12
Benzene (C H ) 78.1100 0.2060
6 6
Hexane (C H ) 86.1700 0.2274
6 14
Hydrogen (H ) 2.0200 0.0053
2
Ammonia (NH ) 17.0300 0.0456
3
Hydrogen sulfide (H S) 34.0800 0.0911
2
Carbon Dioxide (CO ) 44.0100 0.1170
2
Carbon Monoxide (CO) 28.0100 0.0740
Oxygen (O ) 32.0000 0.0846
2
Nitrogen (N ) 28.0200 0.0744
2
Moisture (H O) 18.0200 0.0476
2
TOTALS 100.00% Mixture total 100.00%

yours will not contain all of them. Simply skip lines that ignore that and simply combine the percentages. That
don’t apply. Multiply those values by the values in the result is pounds per hundred cubic feet (the large C
density column and enter the result in the #/C cu. ft. represents 100). Total the results in that column to get a
column. If your analysis includes gases labeled “iso-“ mixture total weight number. Divide each of the results