Boiler annular air box structure and seal method

The invention discloses a boiler annular air box structure. According to the technical scheme, the boiler annular air box structure is mainly characterized in that the boiler annular air box structurecomprises burners, a combustion chamber and boiler tubes, wherein the combustion chamber is surrounded by the boiler tubes; the boiler annular air box structure further comprises an annular air box and binding belts; the annular air box is arranged at the outer side of the boiler tubes in a surrounding manner, and the binding belts are fixed between the boiler tubes and the annular air box; the boiler tubes are arranged on the inner side walls of the binding belts in a stacked manner to form a boiler tube wall; the burners penetrate the boiler tube wall; a first flexible cushion layer is arranged between every two adjacent boiler tubes; the side, close to the annular air box, of each boiler tube is provided with a second flexible cushion layer; the second flexible cushion layers extend tothe outer side walls of t