Method and device for treating ammonia in gasification system

A device for treating ammonia in a gasification system having a gasification furnace for gasifying raw material into gasification gas through formation of a fluidized bed of bed material by introduction of a gasifying agent, a combustion furnace for blowing up by a primary air the bed material guided from said gasification furnace together with unreacted char to heat the bed material by burning of said char, a cyclone for separating the bed material heated in said combustion furnace from combustion exhaust gas to return the bed material to said gasification furnace and an ammonia recovery device for separating and recovering ammonia from the gasification gas produced in said gasification furnace, the device comprising:

• a first line for injection of the ammonia produced in said gasification furnace and recovered in said ammonia recovery device as reducing agent for denitration into an inlet of said cyclone;
• a second line branched halfway from said first line for injection of the ammonia into said primary air to the combustion furnace to burn the ammonia;
• and
• a distributor arranged at a branch point of the first and second lines for adjusting a distribution ratio of the ammonia.