Flue gas heat energy recovery system

A flue gas heat energy recovery system relates to the technical field of flue gas desulfurization and comprises a plurality of sets of small dry desulfurization equipment, each set of small dry desulfurization equipment comprises a desulfurizer hopper, a flue gas leading-in air pipe and a flue gas leading-out air pipe, the top of the desulfurizer hopper is provided with a feed port, and the bottom of the desulfurizer hopper is provided with a discharge port. The lower portion of the desulfurizing agent hopper is in a funnel shape, an interlayer is arranged on the periphery of the outer face of the funnel-shaped lower portion of the desulfurizing agent hopper, shutters are arranged on the side walls of the periphery of the funnel-shaped lower portion of the desulfurizing agent hopper, shutters of the shutters face the interior of the desulfurizing agent hopper downwards in an inclined mode, the shutters are located in the interlayer, and the flue gas leading-in air pipe is communicated with the interlayer. The