On the Formation of Nitrogen Oxides During the Combustion of ...

3.2 Measurement Techniques and Data Acquisition
Table 3.5: Slopes of First Order Curve Fits Based on Relative Quenching Efficiencies.
Slope of first-order curve fit m
Third body species Matthews et al. [273] Tidona et al. [439]
Ar −0.004 80 −0.001 18
CO −0.001 18 −0.001 41
O 2 0.001 15 0.001 32
H 2 0.003 37 0.002 88
CO 2 0.010 47 0.008 96
H 2 O 0.034 30 0.047 56
Figure 3.15 shows a typical measurement reading of genuine exhaust gas from
the CLD 700 LEV ht unit. The concentrations measured by both parallel reaction
chambers are indicated here, providing for a simultaneous determination
of NO and NO x . The NO 2 value is the arithmetic difference of these two values.
The analysis pressure of the CLD highlights the temporal state of the analyzer’s
Table 3.6: Ratio of Actual and Indicated NO Concentrations due to Third Body Quenching.
The calculation of the equilibrium species concentrations is performed with the
software package Gaseq [300]. Since minor species are not included, the sum of the
mole percentages do not total 100%.
Equilibrium species concentration ˜X M in %
Species φ=0.5 φ=1.0 φ=2.0
CO 0.001 1.948 17.191
CO 2 6.529 10.484 2.746
H 2 0.000 0.419 13.705
H 2 O 7.172 12.968 8.219
O 2 10.021 0.866 0.000
N 2 76.062 72.305 58.126
Total 99.786 99.990 99.987
X NO,actual
Matthews et al. [273] 1.326 1.555 1.337
X NO,indicated Tidona et al. [439] 1.413 1.710 1.431
93