22. Calculations of the different parameters
22.1. CO, NO and NOx conversions
CO
[
mg
mg
3
]=
CO
[
ppm
]
x1.24922
NO
[
mg
mg
3
]=
NO
[
ppm
]
x1.33845
NO
x
[
mg
mg
3
]=
NO
x
[
ppm
]
x2.05229
Conversions on units are the same for both gases. CO is taking as an example.
O
2
reference (O
2ref
) is only linked to CO and NO.
λ=
CO
2max
CO
2
=
21
21
−
O
2
CO
[
mg
kWh
]=
CO
[
mg
m
3
]λ
V
f
PCIx0.277778
CO
[
g
kWh
]=
CO
[
mg
m
3
] λ
V
f
PCIx0.277778
x0.001
CO
[
g
GJ
]=
CO
[
mg
kWh
]λ
V
f
PCIx0.277778
x0.001
CO
[
mg
/
m
3
O
2ref
]=
CO
[
mg
m
3
]
x
21
−
O
2ref
21
−
O
2
CO
[
ppm
O
2ref
]=
CO
[
ppm
]
x
21
−
O
2ref
21
−
O
2
CO
[%]=
CO
[
ppm
]
x0.0001
CO
[
g
m
3
]=
CO
[
mg
m
3
]
x
0.001
With:
•
O
2ref
a reference value selected by the user, this value has to be entered in the device in %.
•
O
2
oxygen value measured in %.
•
V
F
the theoretical volume of flue gas in m
3
(given in the table of coefficient)
•
NCV the net calorific value in MJ (given in the table of coefficient)
•
CO
2max
the maximum level in % in carbon dioxide of flue gas dry products (given in the table of coefficient)
22.2. Calculation of the level in NOx
NO
x
=
NO
0.97
with NO the level in nitrogen monoxide in ppm.
0.97 if the %NO
2
is at 3% in the
“Setting”
menu.
0.95 if the %NO
2
is at 5% in the
“Setting”
menu.
So for the measurement of the NO and NO
2
NO
x
=
NO
+
NO
2
22.3. Calculation of flue gas velocity
V
=
k
√
2
Δ
P
M
VF
With:
•
k: coefficient of the differential pressure item
•
ΔP: differential pressure (dynamic pressure).
•
M
VF
: mass density of the flue gas (already calculated for the calculation of the higher efficiency).
42
Calculations of the different parameters
