PDF NITROGEN OXIDES FORMATION in combustion processes

[Pages:56]NITROGEN OXIDES FORMATION in combustion processes

COMBUSTION AND FUELS

NITROGEN OXIDES FORMED DURING COMBUSTION

N2O - nitrous oxide NO - nitric oxide NO2 - nitrogen dioxide N = 14, O2 =16, NO = 30, NO2= 46

COMBUSTION AND FUELS

CONTRIBUTION OF PARTICULAR NITROGEN OXIDES IN TOTAL NOX PRODUCTION

the biggest contribution has nitric oxide (NO) its content in flue gas is in the range of: 100 ?1000 mg/m3

next is nitrogen dioxide NO2 in proportion 5-10% of NO its content in flue gas is in the range of: 10 ?100 mg/m3

N2O has the least contribution: its content in flue gas is in the range of: 1?10 mg/m3

COMBUSTION AND FUELS

WHAT DOES NOX MEAN ?

COMBUSTION AND FUELS

DEFINITION OF NOX

NOX means the sum of NO and NO2 contents in flue gas recalculated on NO2

NOx = NO + NO2

(expressed in NO2)

COMBUSTION AND FUELS

UNITS OF NOX

COMBUSTION AND FUELS

Units of NOx content in flue gas

mg/m3

ppm (emission)

?g/m3 (imission)

Remarks:

g/GJ

1. The NOx content in flue gas is given for a certain content of oxygen (O2) in flue gas.

2. The NOx content in flue gas is given for normal conditions.

3. ppm - unite ? part per million (x10-6)

COMBUSTION AND FUELS

NOX emissions conversion chart

ppm:

NOx [ppm] = NO [ppm] + NO2 [ppm]

ppm mg/m3 NO [mg/m3] = 1.3387 NO [ppm] NOx [mg/m3] = 2.0525 NOx [ppm]

mg/m3 GJ (dla NOx) 1 g/GJ = 2.7 [mg/m3] for bituminous coal 1 g/GJ = 2.35 [mg/m3] for lignite

COMBUSTION AND FUELS

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