Formation of nitrogen oxides during coal combustion

3 Formation of nitrogen oxides during coal combustion 

Fuel Nitrogen Oxides, according to the current views, are produced from nitrogen-containing compounds of coal in the initial section of torch 

All these transformations take place in the region beyond the surface layer of the coal particle, where the gas phase is enriched with oxygen owing to intensive turbulent mixing. The final stage in the chain is NO formation from the monatomic nitrogen by the reactions  

In the oxidizing medium they are more preferable than other reactions bonding active nitrogen (for example, N + NH N2 + H). Therefore, 

The process, in the course of which volatile nitrogen-containing components of OCM leave the coal particle and break down to the nitrile radicals, is a limiting stage of this mechanism. This process is presented in scheme (81) as N(caib0n)- CN. 

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