The heat transfer system is for particulate material in which high or low temperature fluid carrying conduits are disposed in a trough into which the material to be treated is placed. A group of mixing paddles are driven along the trough which mixes and stirs the material and scrapes the material from the conduits. At the point where the conduits enter and exit the trough, the paddles are rotated by a cam follower arrangement to a profile position between the conduits and the conduits and trough sides. While in the profile position, the paddles pass through narrow slots in a stationary cleaning scraper. Material is overhead fed into a trough and discharged from an opening in the bottom thereof after the material has made one pass along the length of conduits in the trough, having been carried along the trough by the raking action of the paddles.
展开▼
