Combustion characteristics of a porous media burner with partial hydrogen injection

Abstract

Multiple energy sources are combined to solve the shortage due to more and more energy consumption. Hydrogen as an ideal clean and renewable energy was injected to the porous media burner to realize the utilization with methane simultaneously. The numerical model of double-layer structure imported with multi-step kinetics mechanisms was built to study the effects of hydrogen injecting position and width on the combustion characteristics of methane after the experimental validation. Results indicate that the axial temperatures during the hydrogen injection at the upstream and interface positions were obviously higher than that at the downstream position. With the increasing of hydrogen injection width, the overall temperature gradually decreased, which was corresponding to the decreasing trend of CO and NOx emissions. However, the temperature and pollutant emissions increased as the equivalence ratio of methane and hydrogen increased. In addition, the increasing of methane and hydrogen velocity increased the CO emission and decreased the NOx emission.