Encyclopedia of Environmental Science and Engineering, Volume I and II

760 NITROGEN OXIDES REDUCTION

TABLE 14

Combustion-Emission Calculations

Type of Gas USA\Texas Molecular weight of gas to be converted 45,9929

Higher Heat Value (MJ/m3n) 41.1

Lower Heat Value (MJ/3n) 37.8

Calc. Heat Value (MJ/nm3) 37.3

Dulong Measured Calculated

Dulong (Btu/lb)  14,544*C  62,028*(H  O/8)  4050 *S



22,764 18,720 18,491 lbmol/MBtu 22.82

(Kj/g)  33.81*C  144.18*(H  O/8)  9.41*S



53 44 43 “K” Factor 952.93

(1)

Fuel Consistent

per lb fuel

(2)

lb Oxygen

required/

lb of fuel constituent

(3)  (1)*

(2)Theoretical

Amt. of Oxygen

Required (lb)

(4)

lb Fuel Gas

Produced/lb

of fuel

(5)

Flue Gas Constituents

CO 2 H 2 OSO 2 O 2 N 2

C 0.67542 2.664 1.799 3.664 2.477

H 0.20863 7.937 1.656 8.937 1.865

S 0 0.998 0 1.998 0.000

O 0 0 See below

N 0.11369 0.114

H 2 O0 0.000

Ash 0

Total 0.998

OEF

Oxygen Excess Factor

For Burner Air &

Leakage – OEF%  0 3.455 0 0

Total Oxygen Supplied 3.455

Nitrogen Supplied  Oxygen * 3.321 11.474 11.474

Dry Combustion Air Supplied 14.929

H 2 O in air @ 0.013 lb H 2 0/lb BDA ~ 0.194 0.194

Wet Combustion Air Supplied 15.123

Flue Gas Constituents (lb/lb fuel) 2.47726031 2.059 0 0 11.474

Specific Volumes * (scf/lb gas) 8.750 21.383 6.011 12.034 13.714

Flue Gas Constituents * (scf/lg fuel), vi 21.676 44.028 0.000 0.000 157.354

Vwet - Total Flue Gas (scf/lb fuel) (wet basis)

Constituents Vol. % (wet basis)  (vi/vwet) * 100%

223.058 9.718 19.738 0.000 0.000 70.544

Vdry - Total Flue Gas (scf/lb fuel) (dry basis)

Constituents Vol. % (dry basis)  (vi/vdry) * 100%

179.030 12.107 0.000 0.000 87.893

Emissions (based on lower heat value):

E (lb/MBtu)

E (grains/dscf))

* Reference conditions 68 deg.F, 29.92 in Hg. Specific volumes based on international gas constant of 8.31439 Joules/mol-deg.K or 1545.4 ft-lb/lb

mol deg.R and thus 385.1 scf/lbmol. The specific volume for nitrogen is based on composition of dry air (20.9% O 2 , 79.1% N 2 ) where N 2 is the

“atmospheric” nitrogen containing about 1% Ar, 0.03% CO 2 , and trace amounts of Kr, Ne, Xe; molecular weight of atmospheric nitrogen is 28.08.


 Humidity at 60% R.H. and 80 deg.F often used as standard.

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