METHOD AND DEVICE FOR TREATING AMMONIA IN GASIFICATION SYSTEM

摘要

Ammonia off-gas 17 (ammonia) separated and recovered by an ammonia recovery device 13 from gasification gas 6 produced in a gasification furnace 1 in a two-column gasification system is injected as reducing agent for denitration into an inlet of a cyclone 10 for separation of bed material 4 heated in a combustion furnace 2 from combustion exhaust gas 9 and for returning the bed material to the gasification furnace 1, so that the ammonia off-gas 17 is contacted with the high-temperatured combustion exhaust gas 9 to reduce and remove NOx through non-catalytic decomposition. Any excess of the ammonia off-gas 17 is distributed for burning to primary air 8 to the combustion furnace 2.