GUARD PROTECTOR FOR HEAT TRANSFER PIPE, BOILER WITH GUARD PROTECTOR, ADDITIONAL INSTALLATION METHOD FOR GUARD PROTECTOR FOR HEAT TRANSFER PIPE

摘要

PROBLEM TO BE SOLVED: To protect a heat transfer pipe of a heat exchanger installed in a combustion discharged gas passage against wear or corrosion through blowing of the combustion discharged gas.SOLUTION: A guard protector 12A includes a plurality of major protectors 12a covering the surface facing to an upstream side of a combustion discharged gas passage of a heat transfer pipe 10 along a longitudinal axis direction and arranged between each of them through an expansion allowable clearance E; and an intermediate protector 12b covering the part of the expansion allowable clearance E between these major protectors 12a from the upstream side in a flowing direction of the combustion discharged gas. One end of the intermediate protector 12b along its longitudinal axis direction is slidably installed in a longitudinal axis direction in respect to at least the outer circumferential surface of one end of the opposing two major protectors 12a through the expansion allowable clearance E. One end of the intermediate protector 12b in its longitudinal axis direction becomes a connection body connected to the major protectors 12a. The other end of the intermediate protector 12b is slidably installed in a longitudinal axis direction in respect to the outer circumferential surface of the end part of the opposing major protector 12a.SELECTED DRAWING: Figure 3