EXHAUST HEAT RECOVERY BOILER AND METHOD FOR CONTROLLING TEMPERATURE OF HEAT TRANSFER PIPE OF EXHAUST HEAT RECOVERY BOILER

摘要

Provided is an exhaust heat recovery boiler with which corrosion of a heat transfer pipe can be suppressed. This exhaust heat recovery boiler (100) comprises: a duct (120); a heat transfer pipe (320) that includes a water inlet (322) and a water outlet (324), and that is disposed inside the duct (120); a water supply piping (400) that includes a first piping (420), and a second piping (440) which branches from the first piping (420) and then converges again with the first piping (420); a tank (160) which is in fluid communication with the water outlet (324) and in the inside of which at least a portion of the second piping (440) is disposed; a water amount adjustment valve (500) that adjusts a ratio between a flow amount of water flowing through the first piping (420) and a flow amount of water flowing through the second piping (440); a measurement device (600) that measures a corrosion rate of the inside of the duct (120); and a control device (800) that adjusts the water amount adjustment valve (500) according to the measurement result.