| 摘要 |
A combination direct/indirect fire drum heating and mixing apparatus includes a frame having an inner cylindrical drum rotatably supported thereto and having an aggregate input in one end thereof and an aggregate output at the other end thereof. A concentric outer drum is mounted around the inner drum and has an aggregate input from the material output of the inner drum and an aggregate output therefrom at the other end thereof, so that aggregate materials can pass through the inner drum and then pass between the inner and outer drums. A burner is mounted to one end of the inner cylindrical drum for directing a flame thereinto and includes a burner blower for blowing atmospheric air under pressure into the burner. An exhaust gas outlet duct operatively connects the exhaust gas from the inner cylindrical drum to the atmosphere or particulate-removing apparatus, while an exhaust gas feedback siphons vapors and gases emitted in the space between the two drums for incineration through the system burner. An asphalt cement injection nozzle injects asphalt cement into the aggregates passing through the concentric outer drum. A second aggregate feed can direct recycled asphalt pavement materials into the concentric outer drum and a dust recovery zone may be provided along with rotating screws for moving the final product discharge or the collected dust.
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