Channel connecting structure and heat preservation mechanism

The utility model relates to the technical field of flue connection, in particular to a channel connecting structure and a heat preservation mechanism, the channel connecting structure comprises a connecting structure, a gas turbine exhaust pipe, a protective skin arranged at one end of the gas turbine exhaust pipe, and a boiler gas inlet pipeline arranged at one end of the protective skin; the sealing structure comprises a sealing ring and a connecting plate arranged at the end of the sealing ring. The limiting structure comprises an inner protection plate, a supporting frame arranged on the inner protection plate and a nut arranged on the supporting frame, the speed of flue gas exhausted by a gas turbine is effectively reduced through the inner protection plate arranged in an arc shape, unstable flue gas entering the impact pipeline connecting position is reduced, meanwhile, high-temperature flue gas flow is guided to stably enter the waste heat boiler to participate in heat exchange, and the heat exchange