Various axial and radial concentrations of HCN

NH3

NO and N2 were measured during the gasification of coal water slurry (CWS) in a laboratory opposed multi-burner gasifier.The results showed that the majority of nitrogen pollutants (HCN

NH3 and NO) came from the release of volatile nitrogen of coal during the rapid heating process of devolatilization.The maximum concentrations of nitrogen pollutants were produced at the nozzle plane and decreased away from the plane; moreover

the ordering in the aft-region was N2>HCN>NH3>NO.Increase of O2/C ratio tended to favor the formation of N2.Flow field distribution led to uniform radial concentrations at the exit and low concentrations near the side-wall in other axial positions.A proper amount of water in CWS tended to favor the formation of HCN and NH3.However

the introduction of excessive steam played a role in restraining the release of volatile nitrogen and reducing the concentrations of HCN

NH3 and NO.