ASPHALT PAVING MIXTURE RECLAIMER

PURPOSE: To attain the control of heating temperature and prevent asphalt denaturation and air pollution by forming a central gas duct at the center of an inner furnace and a peripheral gas duct between the outer periphery of the inner furnace and the inner periphery of an outer furnace and connecting the ducts to a gas duct open to the air. CONSTITUTION: A feedstock obtained by crushing a used asphalt paving material is introduced into an inner furnace 2 through a feedstock inlet 5 disposed at the upper end of an outer furnace 1. A fuel is burned with an oil burner 16 at a fuel hole 3. The combustion fume ascends through a central gas duct 7 disposed at the center of the inner furnace 2 and through a peripheral gas duct 8 disposed between the outer periphery of the furnace 2 and the inner periphery of the furnace 1 to heat, soften, and reduce the asphalt. When a discharge opening 4 of the furnace 2 is opened, the softened asphalt descends along a tilting bottom plate 6 into the furnace 1 through the opening 4, and enters a heat-insulated silo 23 via a stirrer 14. The upper end of the duct 7 and that of the duct 8 are connected to each other and to a gas duct 9 open to the air. The water generated in the furnace 2 is introduced into a gas discharge pipe 10 and removed with a primary condenser 11. The remaining gas is cooled with a secondary condenser 12, and the resulting liquid asphalt is refluxed to the stirrer 14.