Effects of Hydrogen on Ammonia/Methane/Air Combustion in a Can-type Combustor

In recent years, the importance of blending traditional methane gas with alternative fuels in combustion to reduce emissions has gained increasing recognition. Existing literature has demonstrated the successful operation of ammonia and hydrogen as fuels in diesel engines. However, there is still insufficient information regarding the combustion of methane in combination with ammonia and hydrogen. This paper investigates the effects of replacing ammonia with hydrogen in blends consisting of 70% CH4 and 30% NH3, with hydrogen substitution levels of 0%, 10%, 30%, 50%, 70%, and 90%. The simulation was carried out using the SST k-ω turbulence model and steady diffusion flamelet model. Calculations using Okafor-mech to predict the emission characteristics were also attempted to determine concentration values more accurately. Results show that as the proportion of hydrogen in the blended fuel increases, the maximum temperature rises by 29.28 K. There is an increase in emissions of carbon dioxide and carbon monoxide, while nitrogen oxide emissions decrease.