抄録
Recently, ammonia has attracted the attention of many researchers as a carrier for efficient transportation and storage of hydrogen. In factories, it is desirable to use surplus ammonia not only as a hydrogen source but also as fuel (heat utilization) from the practical perspective. However, ammonia is incombustible and generates nitrogen oxides (NOx), which are harmful substances. In this study, the flame structure of ammonia was investigated and a burner was developed for the stable combustion of incombustible ammonia even in high-velocity airflow using a hydrogen flame stabilizer to simultaneously reduce the concentration of NOx. Specifically, (1) when the airflow velocity increased, turbulent mixing and reaction were facilitated and the flame length shortened; (2) a triple jet burner, which could stably perform highintensity combustion even in a turbulent flow field, was developed; and (3) the concentration of fuel-NOx could be reduced to under 300 ppm by enveloping the ammonia fuel in hydrogen flame, in which reduction zone formed.
