Partitioned mixed flue gas bypass injection system

The invention discloses a partitioned mixed flue gas bypass injection system. According to the partitioned mixed flue gas bypass injection system provided by the invention, on one hand, uniform mixing of bypass high-temperature flue gas and main-path medium-temperature flue gas can be realized under a low load; and on the other hand, influence on a main flue can be reduced under a full load, system resistance is reduced, and the service life of the main flue is prolonged. The partitioned mixed flue gas bypass injection system comprises a plurality of flue gas distribution pipelines, wherein the gas inlet ends of the flue gas distribution pipelines are connected with a bypass flue, and the gas outlet ends of the flue gas distribution pipelines extend into the main flue; an electric adjusting switch device is arranged on each flue gas distribution pipeline; a mixed injection device is arranged in the main flue; the mixed injection device comprises a plurality of mixed vortex plates and a plurality of high-tempe