Apparatus for collection and removal of gases from an aluminum reduction cell

Abstract

An apparatus for collection and removal of gases emitted by an aluminum reduction cell is formed within an anode superstructure having two sidewalls spaced from each other. At least one gas transmitting channel having varying cross-section extends along the superstructure toward an end thereof associated with a gas treatment system. A plurality of gas input sections are provided within the superstructure and formed by a pair of spaced from each other members extending transversely to said sidewalls. At least one nozzle is formed at an interface between the gas transmitting channel and the respected gas input section. The ratio of cross-section area of the nozzle at an outlet thereof to a cross-section area of the gas transmitting channel and the output of the nozzle decreases in the direction of the end of the gas transmitting channel associated with the gas treatment system.

1 . An apparatus for collection and removal of gases emitted by an aluminum reduction cell provided with an alumina feeding system, said apparatus comprising;
 an anode superstructure, said anode superstructure formed by at least two spaced from each other side walls to define an operation space therebetween, at least one gas transmitting channel having varying cross-section extending along said superstructure, a distal end of said at least one gas transmitting channel being associated with a gas treatment system, height of said at least one gas transmitting channel increasing toward said distal end thereof, a plurality of gas input sections within said superstructure, each said gas input section formed by a pair of spaced from each other members extending transversely to said sidewalls, each said gas input section extending through said superstructure from an inlet to an outlet provided at said gas transmitting channel and adapted for delivery of said gases to said at least one gas channel, at least one nozzle formed at an interface between each said gas input section and said at least one gas transmitting channel, so as to provide required speed and direction of a gas flow within said at least one gas transmitting channel.   
   
   
       2 . An apparatus according to  claim 1 , wherein ratio of an outlet cross-section area of said nozzle to a cross-section area of the gas transmitting channel at a location of said nozzle outlet decreases in the direction of said distal end of said at least one gas transmitting channel. 
   
   
       3 . An apparatus according to  claim 2 , wherein said device is adapted for collection and removal gases emitted by aluminum reduction cell having an automated alumina feeding system. 
   
   
       4 . An apparatus according to  claim 1 , wherein said plurality of gas input sections is formed within an operation zone of said alumina feeding system. 
   
   
       5 . An apparatus according to  claim 4 , wherein said gas input sections are provided at the location of breakers and metal extraction devices of said aluminum reduction cell. 
   
   
       6 . An apparatus according to  claim 1 , wherein said spaced from each other members are substantially parallel to each other and are connected to said interface, said nozzles extend through said interface. 
   
   
       7 . An apparatus according to  claim 6 , wherein said interface is a wall longitudinally extending between said plurality of gas input sections and said at least one gas transmitting channel, a longitudinal axis of each said nozzle is positioned at an acute angle to said longitudinally extending wall. 
   
   
       8 . An apparatus according to  claim 2 , wherein said members forming said gas input sections are positioned at an angle to each other, so that each said gas input section is formed having a pyramidal configuration, wherein at inlet area of each said gas input section has substantially larger cross-section than the cross-section at the outlet area thereof provided at said interface. 
   
   
       9 . An apparatus according to  claim 8 , wherein each said nozzle is provided at said outlet of the respective gas input section, said nozzle being formed with a buffer so as to further direct the gas flow exiting said nozzle into the gas transmitting channel in the direction of said distal end associated with the gas treatment system. 
   
   
       10 . A device according to  claim 8 , wherein each said gas input section is formed having a frusto-conical configuration. 
   
   
       11 . An apparatus according to  claim 2 , wherein said spaced from each other members forming the respective gas input section are oppositioned at an angle to each other and to said interface, wherein a longitudinal axis of each said gas input section is positioned at an angle to said interface. 
   
   
       12 . An apparatus according to  claim 11 , wherein a curvilinear connection area is provided between each said member and said interface to facilitate smooth entry of said gas from said gas input section into said gas transmitting channel.