| 摘要 |
A grain dryer comprising an air outlet to a water scrubbing dust removal unit arranged to scrub the exhaust air prior to releasing it to atmosphere. The air from the outlet is preferably drawn by a fan and delivered into a generally vertical duct 6 provided with spray nozzles 43 directing water towards the opposed wall of the duct to scrub the air stream. A water curtain is formed at the bottom of the duct 6 to provide a secondary scrubbing. The duct 6 debouches onto the surface of water in a shallow tank 48, and the air turns through 180 DEG through the water curtain. The water is recirculated from the tank 48, over a weir into a collecting trough and through a rotary filter to a pump 47 feeding a common delivery line 46 for the spray nozzles 43. The rotary filter may be provided with a cleaning means for removing the cake from its exterior and extracting it from the system. In another embodiment only a water curtain is provided (Figs. 1 to 5). <IMAGE>
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