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CombustionGasesinReciprocatingGasEngines
-forstandardenthalpy
H
–
i
=
(
MR
)
T
⎛
⎜
⎜
⎝
A
1
i
+
A
2
i
T
2
+
A
3
i
T
3
2
+
A
4
i
T
4
3
+
A
5
i
T
5
4
+
A
6
i
T
1
⎞
⎟
⎟
⎠
-forthestandardchangeofGibbsfreeenergy
15
(4)
Δ
G
i
=
(
MR
)
T
⎛
⎜
⎜
⎝
B
i
1
+
B
i
2
T
2
+
B
i
3
T
3
2
+
B
i
4
T
4
3
+
B
i
5
T
5
4
+
B
i
6
T
1
⎞
⎟
⎟
⎠
(5)
Coefficientsfromtheaboveformulaeappliedmostfrequentlyintheenergy
balancesofthecomponentsofairandexhaustfumescalculatedbytheauthor
arepresentedinTables1and2.
Table1.CoefficientsAilkinequation5forapproximationtotalempathymostimportantchemical
speciesinnaturalgascombustion.Units:
H:cal/mol.
i
pound
Com-
CH4
H2O
CO2
CO
H2
O2
N2
1
2
3
4
5
6
7
i
0.20836E01
0.3299E01
0.3698E01
0.2962E01
0.3155E01
0.3407E01
0.3335E01
A1i
0.7992E-03
0.7426E-02
0.1690E-02
0.7170E-02
0.1038E-02
0.6949E-04
0.5772E-03
A2i
-0.3068E-06
-0.6481E-05
-0.1184E-05
0.2621E-06
-0.8532E-07
0.3105E-06
0.6112E-06
A3i
-0.1194E-09
-0.1293E-09
0.2869E-098
0.1346E-09
0.5079E-09
0.4662E-10
-0.163E-08
A4i
0.34773E-12
-0.2154E-13
0.1968E-13
-0.4598E-12
-0.7840E-13
0.1954E-13
-0.8665E-14
A5i
-0.9939E04
-0.1431E05
-0.3031E05
-0.4848E04
-0.1005E04
-0.1021E04
-0.1019E04
A6i
pound
Table2.CoefficientsBilkinequation6forapproximationofvaluesfreeenergymostimportant
chemicalspeciesinnaturalgascombustion.Units:
Com-
CH4
H2O
CO2
CO
O2
H2
N2
1
2
3
4
5
6
7
i
-5.9183E-01
-1.160E01
4.4313E00
7.4160E00
0.0
0.0
0.0
B1i
7.37732E-04
1.1869E-02
1.7101E-03
4.1825E-03
0.0
0.0
0.0
B2i
-3.9770E-07
-8.5456E-06
-9.2054E-07
-2.6700E-06
0.0
0.0
0.0
B3i
Δ
G
i
9
2.6532E-09
2.9982E-10
7.7618E-10
1.1348E-10
k
:cal/mol/K.
0.0
0.0
0.0
B4i
-3.0065E-13
-3.7106E-13
-8.4258E-14
-1.2059E-14
0.0
0.0
0.0
B5i
1.62121E04
-8.7781E03
-2.8977E04
-0.4849E04
0.0
0.0
0.0
B6i
