Tubular air preheater structure with variable flue section

The utility model discloses a tubular air preheater structure with a variable flue section. The device comprises a flue gas pipe and an air header pipe, a flue gas inlet is formed in the lower end of the left side surface of the flue gas pipe; the collecting box is fixedly connected with the flue gas pipe through a bolt; the left end of the air conveying pipe communicates with an air outlet. The air outlet is positioned on the left side of the flue gas pipe; a flue gas outlet formed in the top end of the flue gas pipe is formed in the upper portion of the gas conveying pipe, the air main pipe is located on the right side of the flue gas pipe, an adjusting rod with the outer surface being of a threaded structure is installed on the inner side of the installation block in a penetrating mode, the adjusting block is located in the air main pipe, and the left end of the air main pipe communicates with a dispersing pipe. According to the variable-flue-section tubular air preheater structure, the problems that accor