| 摘要 |
A drying cylinder (A) is mounted for rotation about its central axis (44). A burner assembly (B) oxidizes fuel interior to the shell, generally along the central axis. A recirculating fan (C) urges the hot combustion gases from the burner into a nozzle box assembly (D). The nozzle box assembly includes a plurality of peripherally spaced, longitudinally extending boxes (80) which have an array of nozzles (82) therein. The nozzles direct jets of hot combustion gases against an interior surface of a cylindrical dryer shell (30) for transferring heat thereto. Hot combustion gases which have impinged upon the shell are recirculated through passages (84) and are in part reheated by the burner and in part discharged through an exhaust aperture (90) and an exhaust duct (92). In one embodiment, the direct fired dryer is mounted in one of the dryer sections of a Fourdrinier paper production line. In another embodiment, particulates and other non-sheet materials are applied to the dryer shell, dried as the dryer shell rotates, and the dried materials are removed. |
