Low-nitrogen combustion chamber of preheater decomposing furnace

The utility model discloses a low-nitrogen combustion chamber of a preheater decomposing furnace. Decomposing furnace, decomposition furnace to five stages of cyclone air pipes are mounted at the topend of the decomposition furnace; a five-stage cyclone discharging pipe is mounted at the bottom end of the five-stage cyclone; a five-stage cyclone ascending air pipe is installed at the top end of the five-stage cyclone, high-temperature gate valves are installed on the first tertiary air pipe (1) and the second tertiary air pipe (2), first pulverized coal combustors (1) are installed on the twosides of the first tertiary air pipe (1), a smoke chamber is installed at the bottom end of the first tertiary air pipe (1), and a rotary kiln is installed on one side of the smoke chamber. Accordingto the utility model, the excess air coefficient can be reduced; according to the low-nitrogen combustion chamber technology, the tertiary air is divided into two sections to supply air, and the pulverized coal combustor is di