Engineering
5 years ago

High swirl secondary air reduces NOx emissions in coal combustion.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
Fundamental study on behavior of coal nitrogen in pulverized coal combustion.
Noriyuki OYATSU, Akira Baba, Kunio OKIURA

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The researchers conducted a combustion test to study how coal nitrogen behaves during coal combustion. They found that high swirl of secondary air helps reduce NOx emissions by deoxidizing NOx with NH3 near the burner. The temperature of the reduction zone greatly affects the NOx reduction process. NH3 is formed from coal nitrogen's volatile matter, while HCN is formed from chemical combinations of fuel-N.