Co-firing method of pulverized coal and ammonia for suppressing the NO<sub>X</sub> generation

In order to reduce CO2 emission from coal-fired boiler, it is expected that ammonia is used as a fuel which has no carbon content. In that case, it is concerned that NOX concentration in flue gas is increased because ammonia has more nitrogen content than coal. With 10 MWth test furnace, 20 % ammonia co-firing test in lower heating value base was conducted. In the case of ammonia co-firing with appropriate supplying method, NOX concentration was as same as that of coal firing with reducing CO2. These results show 20 % ammonia co-firing in actual coal-fired boiler gets closer to realization.