400kA HIGH ENERGY EFFICIENCY REDUCTION POT

Abstract

A 400 kA high energy efficiency reduction pot, comprising: anode carbon blocks, anode busbars, crust breaking and feeding device, anode lifting device, girders and pillars, pot hooding and exhausting system, cathode busbar arrangement structure, cathode carbon blocks, cathode lining structure and cathode pot shell, the pot is characterized in that: 1) superstructure and portal-type pillars are supported by pipe truss girders structure; 2) anode carbon block has eight steel stubs to be configured in a symmetrical mode; 3) the superstructure has 24 double-anode assemblies or 48 single-anode assemblies, six alumina feeding points, and two fluoride salt feeding points; 4) sub-section fume collecting and exhausting system is installed between a horizontal hood plate and a feeding hopper; 5) a device for sealing the anode rod by means a negative pressure suction is provided; 6) a new lining structure of holding heat on bottom, dispersing heat from side, and adding expansion layer at the cathode end have been designed based on the simulation of the electric field and thermal field; 7) the cathode busbars adopt a non-symmetrical configuration, and six power incoming points on the long side of the pot is provided; and 8) rectangular pipe truss girders are used as both air-supply pipeline above the pot and a silencer for tailed air from the crust breaking and feeding cylinder. The present invention has markedly energy-saving and emission reduction effect.

1 . A 400 kA high energy efficiency reduction pot, comprising: anode carbon blocks, anode busbars, crust breaking and feeding device, anode lifting device, girders and pillars, pot hooding and exhausting system, cathode busbar arrangement structure, cathode carbon blocks, cathode lining structure and cathode pot shell, the pot is characterized in that:
 1) superstructure and portal-type pillars are supported by pipe truss girders structure;   2) anode carbon block has eight steel stubs to be configured in a symmetrical mode;   3) the superstructure has 24 double-anode assemblies or 48 single-anode assemblies, six alumina feeding points, and two fluoride salt feeding points;   4) sub-section fume collecting and exhausting system is installed between a horizontal hood plate and a feeding hopper;   5) a device for sealing the anode rod by means a negative pressure suction is provided;   6) a new lining structure of holding heat on bottom, dispersing heat from side, and adding expansion layer at the cathode end have been designed based on the simulation of the electric field and thermal field;   7) the cathode busbars adopt a non-symmetrical configuration, and six power incoming points on the long side of the pot is provided; and   8) rectangular pipe truss girders are used as both air-supply pipeline above the pot and a silencer for tailed air from the crust breaking and feeding cylinder.   
     
     
         2 . The 400 kA high energy efficiency reduction pot according to  claim 1 , wherein said the pipe truss girder structure comprises a connecting beam and crane support provided between two truss girders, characterized in that:
 the truss girder has the connecting beam as the top thereof and is comprised of the portal-type pillars, upper chords, lower chords, straight web members, and diagonal web members, all of which take the form of rectangular steel pipes; wherein   1) the straight web members are distributed at a certain space between the upper chords and the lower chords;   2) the inclined chords are placed between the upper chords and the lower chords, at both sides of the straight web members;   3) the straight web members and the inclined chords provided at both sides of the straight web members are arranged to have a umbrella shape or inverted umbrella shape in turn; and   4) the connecting beam is positioned on the tops of the straight web members and is at the same vertical plane with the upper chords.   
     
     
         3 . The 400 kA high energy efficiency reduction pot according to  claim 1 , wherein said the anode carbon block assembly has eight symmetrical steel stubs comprising cross beams and stubs, characterized in that: the cross beam is comprised of two main cross beams, two diagonal cross beams, and four small cross beams, wherein:
 1) main cross beams and diagonal cross beams are connected in a transverse X-shape;   2) the middle portion of each small cross beam is vertically connected to ends of the main cross beams;   3) both ends of each small cross beam are curved downwards to be connected to the stubs, and the bottom of the stubs is fixed on the carbon block; and   4) a central portion where the two diagonal cross beams are intercrossed with each other is upwardly connected to the anode rod.   
     
     
         4 . The 400 kA high energy efficiency reduction pot according to  claim 1 , wherein said new anode arrangement scheme comprises aluminum reduction pot cavity, anode carbon blocks, and feeding points, characterized in that:
 1) all the feeding points are disposed in the position where the four anode carbon block assemblies converge;   2) the gaps between carbon blocks of two adjacent anode assemblies at the feeding points is widened while the gaps between carbon blocks of two adjacent anode assemblies at the non-feeding points is narrowed; and   3) four corners of the anode carbon blocks at the feeding points are cut off to widen the space of the feeding points.   
     
     
         5 . The 400 kA high energy efficiency reduction pot according to  claim 1 , wherein said the sub-section fume collecting and exhausting system comprises pot fume flue, a main flue, and a control valve, characterized in that:
 1) the flue is disposed inside an interlayer between the horizontal hood plate and the feeding hopper, the lower portion of the feeding hopper is fabricated into V-shaped configuration, instead of welding to the plate girder;   2) the flue is divided into two parallel branch fume pipes and disposed respectively inside the left and right interlayers between the horizontal hood plate and the feeding hopper of the aluminum reduction pot   3) the two branch fume pipes each further comprises front air inlet and rear air inlet;   4) the main flue to which the two branch fume pipes are led is provided with the control valve.   
     
     
         6 . The 400 kA high energy efficiency reduction pot according to  claim 1 , wherein said device for sealing the anode rod by use of a negative pressure suction is provided, the device comprises lateral plate, front end plate, and top plate, characterized in that: the device is a cavity formed by the two lateral plates, top plate, and front end plate and configured to surround around three sides of the anode rod, wherein
 1) a grating structure is adopted for the three surrounded sides of the anode rod at the front end of the cavity device;   2) rear end of the cavity is welded to the web beam and communicated to the horizontal flue; and   3) the cavity device is positioned over the horizontal hood plate which is used as a bottom plate.   
     
     
         7 . The 400 kA high energy efficiency reduction pot according to  claim 1 , wherein said new lining structure is designed on basis of simulation of the electric field and thermal field, and the lining structure comprises cathode carbon blocks, cathode steel bar, and bottom refractory material layer, characterized in that:
 1) the cathode steel bar is located in the pot shell, and a portion of the steel bar exposed out of the cathode carbon blocks is clamped by a U-shaped metal plate, and then tamped with the refractory castable;   2) the cathode steel bar is wrapped with the refractory insulating paper, and, is filled with steel bar paste;   3) the middle bottom of the cathode carbon is provided with granular refractory material while both ends thereof are provided with refractory bricks; and   4) a straight edge paste structure, instead of an arc edge paste structure, is provided between the cathode carbon blocks and the side wall silicon carbide bricks.   
     
     
         8 . The 400 kA high energy efficiency reduction pot according to  claim 1 , wherein said the cathode busbars adopt non-symmetrical configuration and power incoming from six-point on long side of the pot, the cathode busbars comprise a busbar on power incoming side; a busbar on outgoing side, a cathode flexible busbar on power incoming side, a cathode flexible busbar on outgoing side, a pot bottom busbar; and riser busbar, characterized in that:
 1) the local compensation busbar is further provided, the local compensation busbar enters the bottom of the pot, and goes out along of the end of the aluminum reduction pot, then, is lifted to a certain height; and   2) 56 cathode flexible busbars and 6 riser busbars are used to supply power for the aluminum reduction pot, the number of the cathode flexible busbars to be connected to the 6 riser busbars is 10: 9: 9: 9: 9: 10, respectively.   
     
     
         9 . The 400 kA high energy efficiency reduction pot according to  claim 1 , wherein said the rectangular pipe truss girder is also used as both the air-supply pipeline and a silencer for tailed air from the crust breaking and feeding cylinder, comprises a compressed air pipeline, a crust breaking cylinder, a feeding cylinder, and aluminum tapping cylinder, characterized in that:
 1) the compressed air pipeline is connected to the rectangular steel pipe of the truss in the X direction via an one-way air inlet valve;   2) the rectangular steel pipe of the truss in the X direction is connected to the air inlet pipes of the crust breaking cylinder, the feeding cylinder, and the aluminum tapping cylinder via an electromagnetic control valve; and   3) the tailed air exhausting pipes of the crust breaking cylinder, the feeding cylinder, and the aluminum tapping cylinder are connected to the rectangular steel pipes in the X direction or in the Y direction, via the electromagnetic control valve.