HEAT EXCHANGER AND METHOD FOR ESTIMATING REMAINING LIFE OF HEAT EXCHANGER

摘要

Dummy tubes are each provided near a gas inlet side and a gas outlet side of a heat recovery unit and near a gas discharge side of a re-heater via an intubation, and a heat medium is circulated in the dummy tube by a branched path which branches from a medium circulation path. The dummy tube 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.