This study investigates the combustion characteristics of hydrogen, methane, and coke oven gas (COG) blended with ammonia (NH 3 ) using one‐dimensional simulations. The laminar burning velocity (LBV), adiabatic flame temperature, and nitrogen oxide (NO x ) emissions were analyzed across different NH 3 blending ratios (0%–100%). Hydrogen had the highest burning velocity, dropping sharply with NH 3 , while methane’s decrease was gradual. COG showed intermediate behavior, resembling hydrogen. The addition of NH 3 reduced the adiabatic flame temperature in all mixtures, with COG/NH 3 /air exhibiting a trend between H 2 /NH 3 and CH 4 /NH 3 . Flame thickness increased with NH 3 content, with COG following trends similar to those of H 2 /NH 3 /air combustion. NO x emissions were initially low for all fuels, but increased significantly with NH 3 addition, peaking at 25% NH 3 for H 2 and COG, and 50% NH 3 for CH 4 , after which emissions declined owing to the weakening of the HNO pathway. COG/NH 3 combustion characteristics align closely with H 2 /NH 3 but trend toward CH 4 /NH 3 as NH 3 content rises. The study introduces a method to predict COG/NH 3 /air combustion characteristics by fitting the combustion data of H 2 /NH 3 /air and CH 4 /NH 3 /air. This method provides accurate predictions of LBV, flame temperature, and nitric oxide (NO) emissions. Methane’s influence is most significant on flame temperature, followed by NO emissions and LBV.
Wu et al. (Thu,) studied this question.