Nox Emission Combustion Fuels

Reference data and engineering information about nox emission combustion fuels for combustion applications.

noxemissioncombustionfuels

Overview

Engineering reference data for Nox Emission Combustion Fuels in combustion engineering.

$Q = \dot{m} \cdot HV$

Fuel energy release rate.

$AF = \frac{m_{air}}{m_{fuel}}$

Mass of air per mass of fuel.

$EA = \frac{O_2}{21 - O_2} \times 100\%$

From flue gas oxygen measurement.

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Typical NOx emission factors for various fuels. Values are indicative and can vary significantly based on combustion conditions.
Fuel	Emission Factor(10⁻³ kg NOx/kg fuel)
Oil	3
Kerosene	3
Coal	4.5
Propane	2.3
Gasoline	27
Hydrogen	0
Natural Gas	1
Butane	2.3
Wood (Birch, 20% moisture)	0.7

Source: engineeringtoolbox.com

Theoretical vs. Practical Emissions: Hydrogen's listed zero emission is a theoretical value. In practice, burning hydrogen in air produces more NOx than natural gas due to its high flame temperature.
Application Variability: Emission factors vary widely depending on combustion temperatures and air/fuel ratios. In general, higher temperatures and higher air/fuel ratios increase NOx emissions.
After-Treatment Systems: Modern vehicles commonly use catalytic systems that significantly reduce NOx emissions from gasoline and other fuels.
Environmental Impact: NOx emissions contribute to eutrophication, acidification, and the formation of ground-level ozone.