Combustor for internal circulation of mixed gas and flue gas

The invention relates to the field of combustors, and discloses a mixed gas and flue gas internal circulation combustor, which is used for being mounted on a hearth and comprises a central fire combustion cylinder arranged in the hearth and positioned in the center of the hearth; the combustible gas pipeline is used for conveying combustible gas, and the central fire combustion cylinder is communicated with the combustible gas pipeline; the peripheral premixing nozzle assemblies are arranged in the circumferential direction of the central fire combustion cylinder and comprise gas premixing cylinders and inner gas spraying pipes used for conveying combustible gas, the gas premixing cylinders are arranged in the hearth, one ends of the inner gas spraying pipes extend into the hearth, and the other ends of the inner gas spraying pipes extend into the hearth; the gas outlet end of the inner gas spraying pipe extends into the gas premixing barrel from the end, close to the front end of the hearth, of the gas premi