| abstract |
The invention is suitable for the field of boilers and provides a biomass boiler with flue gas recirculation, which comprises a material cavity, a hearth for heating the material cavity, an air inlet assembly, a separator, a flow control assembly and the like. The air inlet fan charges air into the first hearth through the air inlet assembly, and the flue gas around the air inlet assembly is sent into the biomass fuel for secondary combustion, so that the flue gas is subjected to secondary circulating combustion; the flue gas after burning enters into the second furnace through the flue gas passageway by first furnace for the flue gas obtains the third time burning, and along with the size change of flue gas volume, accuse stream subassembly control gets into the second furnace in how much of the air. The purposes of narrowing the distribution range of the high-temperature area, optimizing the mixing ratio of the fuel and the air, reducing the temperature in the hearth and further reducing the content of the nitrogen oxide are achieved. |