| 摘要 |
PURPOSE:To prevent the accumulation of powder dust in a duct and make the cleaning of the duct unnecessary by a method wherein the dust collecting duct is provided with a down slope toward the downstream side of the same while the dust collecting duct is provided with a nozzle for spraying water. CONSTITUTION:Water is sprayed from a nozzle 5 while air, containing powder dust, is being ventilated through a duct 1. In this case, a pump 9 is driven and water is supplied to the nozzles 5 through a main pipe 8 and branch pipes 7. The amount of water, sprayed from the nozzles 5, is the amount enough to wash down the powder dust adhered to the inner walls of the duct 1 while the amount of water is controlled by a water amount regulating valve 6 so as to obtain such amount. The sprayed water flows down toward the downstream side of the duct 1 and is discharged into a water tank 4a. The powder dust, washed down by the spray of water, is carried into the water tank 4a together with the sprayed water and is settled on the bottom of the water tank 4a, then, is discharged by a scraper 4b. |
