To prevent a dust discharging device such as a screw conveyer, which discharges dust to the outside of a system from a high temperature furnace handling high temperature combustion gas generated in a waste treatment furnace, from being damaged by high temperature corrosion or low temperature corrosion.

In the high temperature furnace 10 handling high temperature combustion gas generated in waste treatment furnace, a roaster 40 formed of a plurality of metal tubes 41 disposed horizontally at fixed intervals is arranged just above the dust discharging device 30 discharging settling dust to the outside of the system. In the metal tube 41, a plurality of supply openings 43b are arranged to introduce air into the metal tube 41 from the outside and to jet the air from the supply openings 43b toward the dust discharging device 30.

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