Plate type air preheater for promoting air preheating

The invention discloses a plate-type air preheater for promoting air preheating, and relates to the technical field of preheating equipment, the plate-type air preheater comprises a shell and a heat exchange assembly, the heat exchange assembly comprises a first main pipe and a second main pipe, and the top of the first main pipe and the bottom of the second main pipe are fixedly connected with zigzag supports; the first main pipe and the second main pipe are fixedly installed at the center of the inner wall of the shell through zigzag supports, a flow dividing pipe is installed between the first main pipe and the second main pipe and is arranged to be in an S shape, and a heat conduction assembly is installed at the center of the outer circle face of the flow dividing pipe and comprises a heat tracing pipe, and the top end of the heat tracing pipe communicates with a square bend. The side, away from the flow dividing pipe, of the heat tracing pipe is fixedly connected with a heat conducting piece, and a roun