Mikrofill ETHOS 70 - 12 Conversion Formulae & Factors

CONVERSION FORMULAE & FACTORS
42 TECHNICAL DOCUMENTATION
FORMULAE
11.7% CO
2
is the maximum CO
2
percentage that is generated by stoichiometric burning of G20 natural gas
(H-gas).
Excess Air N:
CONVERSION FACTORS
• For NO
x
1 ppm = 2.05 mg/m
3
= 1.759 mg/kWh = 0.498 mg/MJ
• For CO 1 ppm = 1.24 mg/m
3
= 1.064 mg/kWh = 0.298 mg/MJ
EXAMPLE
Measured values for an environmentally friendly unit:
• NO
x
• CO
2
What is the value for NO
x
according to the most usual standard in mg/kWh for N = 1?
NO
x
(for N = 1) =
15.0 x 1.17 = 17.6 ppm
17.6 x 1.759 = 30.9 mg/kWh
• 1 kcal
• 1 kWh
EFFICIENCY AT THE FLUE GAS SIDE
The difference between gross and nett calorific values is the heat of evaporation of the combustion
produced water. At 298.15°K (25°C), this is 2442.5 kJ/kg (583.38 kcal/kg).
20.9
20.9 - measured O
2
CO
2
= x 11.7
11.7
measured CO
2
x 20.9
O
2
= 20.9 -
20.9 - measured O
2
20.9
N = x 0.914
CO
2
measured
11.7
N = 1 + x 0.914
(N = 1):
(N = 1):
= 15 ppm
= 10%
11.7
10 x 20.9
O
2
= 20.9 - = 3%
20.9 - 3
20.9
N = = 1.17
Watts (W)
1
1.163
0.293
kcal/h
0.86
1
0.252
Btu/h
3.41
3.97
1
▲ FIGURE 13. CONVERSION FACTORS.
= 4.187 kJ
= 3.6 MJ