Measurement of nitrogen evolution in a staged oxy-combustion coal flame

► NOX, HCN, and NH3 measurements taken in staged air and oxy-combustion. ► At a fixed S.R., oxy-combustion produced more NH3, HCN, and CH4 in the fuel rich zone. ► Oxy-combustion produced minimum NOX at fuel rich S.R. = 0.83, air at S.R = 0.63. ► NOX in oxy-combustion is less sensitive to fuel rich zone S.R.