HEAT EXCHANGER AND METHOD FOR ESTIMATING REMAINING LIFE OF HEAT EXCHANGER

摘要

Dummy tubes 30 are each provided near a gas inlet side and a gas outlet side of a heat recovery unit 104 and near a gas discharge side of a re-heater 108 via an intubation 31, and a heat medium 83 is circulated in the dummy tube 30 by a branched path L 2 which branches from a medium circulation path L 1 . The dummy tube 30 is periodically extracted to check the quantity of thickness reduction of the surface thereof. Thus, it is possible to check the quantity of thickness reduction of the surface of the dummy tube, and determine the state of damage or the like of a heat transfer tube.