| 摘要 |
A vacuum chamber (10, 10') having first and second ends (28, 28') with a flow passage (30) at each end for directing the flow of particulate material into and out of the vacuum chamber. The vacuum chamber has a vacuum outlet duct (26) midway between the first and second ends (28, 28') thereof for removing gaseous contaminants. A flow control structure (32, 32') is disposed within the vacuum chamber (10, 10') between said first and second ends and has symmetrical ends for receiving particulate material from one of the flow passages (30) and directing the flow of particulate material to the other one of the flow passages while isolating the flow of particulate material from the surrounding space of the vacuum chamber through the central portion of the vacuum chamber adjacent the vacuum outlet duct (26) and for dispersing the particulate material while being subjected to the vacuum chamber adjacent the other one of the flow passages before the particulate material flows out the other one of the flow passages. Additionally, an electric field producing structure (80) may be included for producing an electric field to subject the particulate material to the electric field to electrically charge the gaseous contaminants and cause separation of the contaminants from the particulate material to facilitate removal of gaseous contaminants through the vacuum outlet duct. |
