Annex C - Coefficients Of The Fuels And Formulas - Seitron CHEMIST 600 BE GREEN Use And Maintenance

ANNEX C
Coefficients of the fuels and Formulas
The following chart, derived from standard UNI 10389-1, lists the coefficients of the fuels, used to calculate
losses and efficiencies.
Fuel A1
Natural gas 0,660
Propane 0,630
L.P.G. 0,630
Butane 0,630
Diesel oil 0,680
Fuel oil 0,680
Propane air 0,682
Biogas 0,719
Pellets (8% RH) 0,740
Wood (20% RH) 0,761
Chipped wood 0,8020
Coal 0,7620
CO Off gas 0,775
Olive pits 0,749
Rice husk 0,777
B20 0,701
Digester gas 0,695
Details of the coefficients of the fuels:
• CO2 t: The value of CO
and therefore maximum.
A1, A2, B: Also please have a look at the Siegert formulas from the European standard EN50379-1 (in the

following).
A1 is the parameter in the Siegert Formula when the O
A2 is used when the CO
Note: - Please also consider that in the U.S. usually the A1 parameter is the same as the
'European' A1 BUT divided by 2.
- For Germany coefficients A1 and A2 are swapped.
Flue gas heat losses are calculated from measured oxygen content according to the relationship:
A1
q = (t - t ) x
A A L
21 - O
2
Flue gas heat losses are calculated from measured carbon dioxide content according to the relationship:
A2
q = (t - t ) x + B
A A L
CO
2
• CO conv: Conversion coefficient from ppm to mg/KWh. It can be expressed as a function of the gas density
(CO in this case) and the volume of the dry smoke.
• NO conv: Same as CO conv, but for NO.
• NOx conv: Same as CO conv, but for NOx
• SO2 conv: Same as CO conv, but for SO2.
• PCI: Potere Calorifico Inferiore. Italian for LHV (Lower Heating Value).
• PCS: Potere Calorifico Superiore. Italian for HHV (Higher Heating Value).
• m H2O: Mass of the air produced (per each Kg of fuel) in the combustion in stoichiometric condition.
• m Air: Mass of the air needed for combustion in stoichiometric condition.
• V g.d.: Volume of dry smoke produced in the combustion.
Coefficients for calculating combustion efficiency
A2 B
0,380 0,0100
0,420 0,0080
0,420 0,0080
0,420 0,0080
0,500 0,0070
0,520 0,0070
0,447 0,0069
0,576 0,0086
0,670 0,0071
0,686 0,0089
0,785 0,0108
0,691 0,0023
1,164 0,0012
0,689 0,0065
0,768 0,007
0,518 0,0055
0,352 0,0085
generated by combustion in stoichiometric condition, i.e. without excess Oxygen
2
measurement is available.
2
+ B
CO2t PCI PCS
(%) (KJ/Kg) (KJ/Kg)
11,70 50050 55550
13,90 45950 49950
13,90 45730 49650
13,90 45360 49150
15,10 42700 45500
15,70 41300 43720
13,76 28250 30700
16,81 19200 21250
19,01 18150 19750
18,93 15450 17170
20,56 11950 13565
19,06 31400 32300
31,55 8610 8735
19,33 18780 20309
20,74 12558 13633
15,52 41806 44620
10,65 21303 23644
measurement is available.
2
183
M air M H O V dry gas
2
3
(Kg/Kg) (Kg/Kg) (m /Kg)
17,17 2,250 11,94
15,61 1,638 11,11
15,52 1,602 11,03
15,38 1,548 10,99
14,22 1,143 10,34
13,73 0,990 10,06
9,13 0,999 6,77
6,38 0,840 5,82
6,02 0,660 4,58
5,27 0,700 4,01
4,20 0,660 3,25
10,70 0,370 8,14
2,21 0,051 2,14
6,290 0,626 4,79
4,065 0,440 3,15
14,04 1,152 13,89
6,93 0,905 7,02
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