Combustion of Fuels and Nitrogen Oxides (NO_x) Emission

Emission of Nitrogen Oxides - NO_x - with combustion of fuels like oil, coal, propane and more

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Emission of Nitrogen Oxides - NO_x - when burning different types of fuels:

Fuel	Emission of NO_x ¹⁾ (10^-3 kg_NOx/ kg_fuel)
Oil	3.0
Kerosene	3.0
Coal	4.5
Propane	2.3
Gasoline	27 ³⁾
Hydrogen	0²⁾
Natural Gas	1.0
Butane	2.3
Wood, Birch 20% moisture content	0.7

¹⁾ note that the emission varies widely depending on application temperatures and air/fuel ratios. In general - higher combustion temperature and higher air/fuel ratios increases NO_x emissions.

²⁾ zero emission for hydrogen is a theoretically value. In practice hydrogen burned in air produces more NO_x than natural gas due to the high flame speed

3) catalytic systems common on most modern vehicles reduces NO_x

NO_x emissions contributes to eutrophication, acidification and the formation of ground-level ozone.

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en: nitrogen oxides nox emission combustion fuels oil methane lpg propane

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