| 摘要 |
To free the granular material forming annular filter bed (11) from dust, it is periodically circulated in a closed cycle through a conveyor tube (14) and back to the bed via drop pipes (24), while a scavenging gas from inlet 2 flows through the bed in the reverse direction. In a separating housing (18) the granules swept along by the conveying gas stream from inlet (12) strike a deflecting member (15) and are deflected against the inner wall of the housing (18) and thence to pipes (24), while the dust-laden conveying gas is recirculated through a connecting pipe (19) into the crude gas chamber (20). The conveying gas enters chamber (20) tangentially and creates a cyclone-like rotational movement which separates the dust from the conveying gas and from the scavenging gas emerging from the bed. The entrance point E of the pipe (19) is chosen so that the end point of the helical line (S) comes to lie approximately opposite the gas exit (35) so that a large part (D) of the dust settles in zone (26) and is not carried into the crude gas channel (21) and thence to neighbouring filters. <IMAGE> |
