AFTERBURNER

PROBLEM TO BE SOLVED: To provide an afterburner capable of reducing attachment of ash to a water wall and a heat transfer tube in a waste heat boiler mounted at a wake flow side of the afterburner. SOLUTION: This afterburner 1 for burning an unburnt portion included in an exhaust gas from a melting furnace 3 for melting and converting ash into slag by combustion heat, has a pipe conduit 15 mounted in an exhaust gas flow channel 7 in which the exhaust gas (e) is circulated, and used as a cooling member having a temperature lower than a temperature in the exhaust gas flow channel and allowing the ash accompanying with the exhaust gas 3 to attach to its surface, a steam jetting nozzle 29 as a means for removing the ash attached to the surface of the pipe conduit 15, a first temperature detecting means 21 for detecting a temperature of fluid on an inlet side of the pipe conduit 15, and a second temperature detecting means 23 for detecting the temperature of fluid on an outlet side of the pipe conduit 15. The steam jetting nozzle 29 jets steam to remove the ash attached to the surface of the pipe conduit 15 when the temperature difference between the temperature detected by the first temperature detecting means 21 and the temperature detected by the second temperature detecting means 23 becomes less than a predetermined temperature difference. COPYRIGHT: (C)2006,JPO&NCIPI