Integrated waste heat boiler of built-in SCR (Selective Catalytic Reduction) denitration device

The utility model belongs to the technical field of waste heat boilers, and particularly relates to an integrated waste heat boiler of a built-in SCR (Selective Catalytic Reduction) denitration device, which comprises a boiler body, a boiler barrel, a membrane water cooling wall and an inverted U-shaped double flue, and the double flue comprises a convection evaporation tube bundle flue and an SCR denitration flue; a superheater and a plurality of rows of longitudinal convection evaporation tube bundles are arranged in the convection evaporation tube bundle flue; an SCR denitration device and a multi-stage built-in economizer are arranged in the SCR denitration flue; the convection evaporation tube bundle flue is communicated with the SCR denitration flue, a flue gas inlet is formed in the side face of the lower portion of the convection evaporation tube bundle flue, and a flue gas outlet is formed in the side face of the lower portion of the SCR denitration flue. The SCR denitration flue in the boiler is ado