The utility model relates to a novel floating tube plate sealing structure and a
heat exchanger, the sealing structure comprises a floating tube plate, a support ring plate, a fixing
assembly and a plurality of sliding bosses, the plurality of sliding bosses are uniformly and fixedly arranged at intervals in the circumferential direction, and the fixing
assembly is fixedly arranged and located on one side of one end of each sliding boss; the floating tube plate is located on the inner sides of the multiple sliding bosses and slidably connected with the multiple sliding bosses through sliding pieces, and the floating tube plate is fixedly connected with the fixing
assembly through the supporting ring plate. The sealing device has the advantages of being simple in structure, reasonable in design, suitable for being used in all heat exchangers with floating tube plates, better in sealing effect, capable of improving reliability of equipment, reducing the risk that the device is forced to stop, improving production benefits and reducing production cost. The problems that the floating tube plate end of a large
heat exchanger with the large
temperature difference leaks seriously, and heat exchange tubes are broken due to jamming of the floating tube plate in the sliding process are effectively solved.