초록 ▼

A drum-type drier and/or mixer in which particulate material such as aggregate or recycled asphalt is introduced into the forward end of the drum. A burner at the rear end of the drum directs its flame forwardly through an elongated firing tube which extends from the rear end of the drum toward the

A drum-type drier and/or mixer in which particulate material such as aggregate or recycled asphalt is introduced into the forward end of the drum. A burner at the rear end of the drum directs its flame forwardly through an elongated firing tube which extends from the rear end of the drum toward the forward end thereof. The hot gases discharged from the tube strike a baffle, are deflected into an annular chamber between the tube and the drum and then flow rearwardly through the chamber to an exhaust stack. The particulate material also is advanced rearwardly through the chamber and, during such advance, is heated (1) indirectly by the hot gases flowing forwardly through the firing tube and (2) directly by the hot gases deflected into and flowing rearwardly through the chamber.

대표청구항 ▼

Apparatus for heating particulate material, said apparatus comprising an elongated drum having inlet and outlet ends, means for rotating said drum about its own axis, an elongated firing tube disposed centrally within said drum, said tube extending from the outlet end of the drum toward the inlet en

Apparatus for heating particulate material, said apparatus comprising an elongated drum having inlet and outlet ends, means for rotating said drum about its own axis, an elongated firing tube disposed centrally within said drum, said tube extending from the outlet end of the drum toward the inlet end of the drum and having a discharge end located adjacent the inlet end of the drum, the outer wall of said tube being spaced inwardly from the inner wall of said drum whereby an annular chamber is defined between said tube and said drum, a burner located adjacent the outlet end of said drum and positioned to direct a gaseous flame into the adjacent end portion of said tube, the hot gases from said flame flowing within said tube in a direction extending from the outlet end of the drum toward the inlet end of the drum and being directed out of the discharge end of said tube, means located adjacent the discharge end of said tube for directing the hot gases from said tube into said annular chamber and for causing said gases to flow within said chamber from the inlet end of said drum toward the outlet end thereof, means adjacent the inlet end of said drum for delivering particulate material into said chamber, means located between said drum and said tube for causing said material to tumble within said chamber as an incident to rotation of said drum, said material and said gases moving in the same direction through said chamber with said material being indirectly heated during such movement by the hot gases flowing in said tube and being directly heated by the hot gases flowing in said chamber, an upwardly extending exhaust stack adjacent the outlet end of said drum for receiving hot gases from said chamber and for effecting upward discharge of such gases, and a discharge opening adjacent the outlet end of said drum for discharging the heated material out of said chamber.