Heat accumulating type burner for aluminum smelting

Abstract

The invention belongs to the technical field of aluminum smelting, and particularly relates to a heat accumulating type burner for aluminum smelting, which comprises a heat accumulating chamber and a burner connected to the bottom side of the heat accumulating chamber, at least two layers of barriers are arranged in the heat accumulating chamber along the vertical direction, and heat accumulating balls are mounted on the barriers; a gas inlet / outlet is formed in the upper part of the heat storage chamber; a plurality of stirring mechanisms are arranged in the heat storage chamber in the vertical direction, the number of the stirring mechanisms is the same as that of the barriers, and the stirring mechanisms are arranged above the barriers on each layer. According to the structure, the heat storage balls are arranged in a layered mode through the barriers, the heat storage balls are filled in the heat storage chambers with different heights in a loose accumulation mode and fixed through the bottom barriers, the layered structure can avoid excessive accumulation of the heat storage balls, the heat exchange efficiency is further improved, and meanwhile the maintenance convenience is improved; the replacement period of the heat storage ball body can be prolonged, ash removal is achieved under the condition that the heat storage chamber is not disassembled, and the heat efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum smelting, and in particular relates to a regenerative burner for aluminum smelting. Background Art

[0002] Currently, the aluminum smelting industry widely uses regenerative burners. The regenerative spheres in these burners store heat from the flue gas and transfer it to the combustion air, acting as a heat exchanger and achieving significant energy savings. However, regenerative burners in the aluminum smelting industry have two major drawbacks.

[0003] 1. In the aluminum smelting industry, especially for recycled aluminum, the smelting materials used are mostly recycled waste aluminum. The flue gas generated during combustion contains a large amount of dust and impurities, and the composition is complex. The flue gas generated during combustion contains a large amount of dust and impurities, which will accumulate on the heat storage sphere, shortening the replacement cycle of the heat storage sphere;

[0004] 2. At present, most domestic regenerative burners are unable to realize online ash cleaning of the regenerative balls. In the regenerative combustion system, the thermal efficiency of the regenerative balls decreases due to ash accumulation, slagging or particle adhesion after long-term operation, and it is impossible to achieve ash cleaning without dismantling the regenerative chamber. Summary of the Invention

[0005] In view of the technical problems existing in the background technology, the present invention provides a regenerative burner for aluminum smelting.

[0006] To achieve the above objectives, the technical solution provided by the present invention is:

[0007] A regenerative burner for aluminum smelting comprises a regenerative chamber and a burner connected to the bottom side of the regenerative chamber. The regenerative chamber is provided with at least two layers of gratings in the vertical direction, and regenerative balls are mounted on the gratings. A gas inlet and outlet are provided above the regenerative chamber. The regenerative chamber is provided with a plurality of stirring mechanisms in the vertical direction. The number of the stirring mechanisms is the same as the number of the gratings, and the stirring mechanisms are arranged above each layer of the gratings.

[0008] Optionally, the heat storage chamber includes an upper heat storage chamber and a lower heat storage chamber that are detachably connected, the bottom side of the lower heat storage chamber is bent to provide a connecting portion, and the burner is connected to the connecting portion; a layer of grille is respectively provided on the bottom side of the upper heat storage chamber and the lower heat storage chamber.

[0009] Optionally, a detachable ash unloading chamber is provided on one side of the lower heat storage chamber, the ash unloading chamber is provided on the bottom side of the grille, a telescopic mechanism is provided on the outer side of the ash unloading chamber, an ash receiving plate is slidably provided on the inner wall of the ash unloading chamber, and the telescopic mechanism is connected to the ash receiving plate to drive the ash receiving plate to extend into the interior of the lower heat storage chamber to receive dust.

[0010] Optionally, a ball unloading port is provided on one side of the lower heat storage chamber, and the ball unloading port is provided on the upper side of the grille in the lower heat storage chamber. A first flange is provided on the outer side of the ball unloading port, and a first cover is detachably provided on the first flange.

[0011] Optionally, a second flange is provided at the upper end of the lower heat storage chamber, and a third flange is provided at the lower end of the upper heat storage chamber. The second flange and the third flange are connected as a whole through a mounting block. The inner wall of the mounting block is provided with an annular baffle, the grille is provided on the inner wall of the mounting block, and the bottom side of the grille is supported on the baffle.

[0012] Optionally, a second cover is detachably connected to the grille disposed inside the mounting block.

[0013] Optionally, an ash discharge port is provided on the bottom side of the lower heat storage chamber, a fourth flange is provided on the outside of the ash discharge port, a fifth flange is provided on one side of the ash discharge chamber, and the fifth flange is detachably connected to the fourth flange.

[0014] Optionally, a first air flow channel with a gradually decreasing opening is provided inside the connecting portion, and the cross-section of the first air flow channel is rectangular; a second air flow channel and a third air flow channel that are interconnected are sequentially provided inside the burner, and the opening of the second air flow channel gradually increases toward the direction of the third air flow channel, and the cross-section of the second air flow channel is rectangular. The second air flow channel is connected to the first air flow channel, and the third air flow channel is a conical channel with a gradually increasing opening.

[0015] Optionally, a fourth air flow channel and a fifth air flow channel are symmetrically arranged on both sides of the inner wall of the third air flow channel, the cross-section of the fourth air flow channel is rectangular, the opening of the fourth air flow channel gradually decreases toward the second air flow channel and docks with the second air flow channel; the opening of the fourth air flow channel gradually increases toward the fifth air flow channel and docks with the fifth air flow channel, and the end of the fifth air flow channel is smoothly transitioned to the third air flow channel.

[0016] Optionally, two mounting tubes are evenly distributed on the circumference of the burner, and mounting holes are provided in the mounting tubes. The ends of the mounting holes are connected to the third air flow channel, and the mounting holes are staggered with the fifth air flow channel. A fuel gun and an ignition gun are respectively provided in the mounting holes.

[0017] The present invention has the following advantages and beneficial effects:

[0018] The present invention proposes a regenerative burner for aluminum smelting. The regenerative chamber is equipped with at least two vertically arranged grids, with regenerative balls mounted on top. Several stirring mechanisms are also vertically arranged within the regenerative chamber, positioned above each grid layer. This structure utilizes the grids to achieve a layered arrangement of regenerative balls. The balls are loosely packed within the regenerative chamber at different heights and secured by a bottom grid. This layered structure prevents excessive accumulation of regenerative balls, further improving heat exchange efficiency and simplifying maintenance. For example, small-diameter regenerative balls can be placed at higher levels, while large-diameter balls can be placed at lower levels. This structure allows the stirring mechanism to agitate and clean the regenerative balls at different heights. This arrangement is simple and reliable. The stirring mechanism disturbs the ball bed, causing ash to fall off and be discharged through the bottom ash outlet. This can extend the replacement cycle of the regenerative balls, enabling ash cleaning without disassembling the regenerative chamber, thereby improving thermal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is one of the structural diagrams of the regenerative burner for aluminum smelting in the present invention;

[0020] Figure 2 This is the second structural diagram of the regenerative burner for aluminum smelting in the present invention;

[0021] Figure 3 for Figure 2 Front view of

[0022] Figure 4 for Figure 3 Left view of;

[0023] Figure 5 for Figure 4 Cross-sectional view along AA direction;

[0024] Figure 6 This is one of the structural diagrams of the heat storage chamber in the present invention;

[0025] Figure 7 This is the second structural diagram of the heat storage chamber in the present invention;

[0026] Figure 8 This is one of the structural diagrams of the burner in the present invention;

[0027] Figure 9 This is the second structural diagram of the burner in the present invention;

[0028] Figure 10 for Figure 9 Front view of

[0029] Figure 11 for Figure 9 Rear view;

[0030] Figure 12 for Figure 10 Cross-sectional view along the BB direction;

[0031] Figure 13 for Figure 10 Cross-sectional view along CC direction;

[0032] Figure 14 for Figure 10 Isometric cross-sectional view along CC direction;

[0033] Figure 15 It is a structural diagram of the dust cleaning chamber in the present invention;

[0034] Figure 16 It is a structural diagram of the stirring mechanism in the present invention.

[0035] Figure numerals: 1-lower heat storage chamber, 11-connecting part, 12-first air flow channel, 13-sixth flange, 14-second flange, 15-axial hole, 16-ball discharge port, 17-first flange, 18-ash discharge port, 19-fourth flange, 191-first rib plate, 2-burner, 21-mounting pipe, 211-mounting hole, 212-fuel gun, 213-ignition gun, 22-seventh flange, 23-second air flow channel, 24-fourth air flow channel, 25-fifth air flow channel, 26-third air flow channel, 3-upper heat storage chamber, 31- The third flange, 32-gas inlet and outlet, 33-mounting block, 331-baffle, 4-bearing seat, 41-agitation shaft, 411-air hole, 42-shaft body, 43-agitation rod, 431-injection hole, 5-ash unloading chamber, 51-third cover, 52-fifth flange, 53-extension plate, 54-second rib plate, 6-cylinder, 61-cylinder seat, 62-piston rod, 63-ash receiving plate, 7-motor, 71-reduction gearbox, 72-connecting seat, 73-pulley, 74-conveyor belt, 8-first cover, 9-grating, 10-second cover. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0038] Example

[0039] like Figures 1 to 5 As shown, a regenerative burner for aluminum smelting comprises a regenerator chamber and a burner 2 connected to the bottom of the chamber. At least two layers of gratings 9 are vertically arranged within the chamber, with regenerative balls mounted on the gratings 9. These gratings 9 are used to pack the regenerative balls at different levels within the chamber. A gas inlet and outlet 32 is located above the regenerator chamber for introducing combustion air and removing flue gases. Several stirring mechanisms are vertically arranged within the chamber, with the same number of stirring mechanisms as the gratings 9. These stirring mechanisms are located above each layer of gratings 9 to stir and clean the regenerative balls on different levels.

[0040] This structure uses the grille 9 to achieve layered arrangement of heat storage balls. The heat storage balls are loosely stacked in heat storage chambers at different heights and fixed by the bottom grille. This layered structure can avoid excessive backlog of heat storage balls, ensure the looseness, further improve the heat exchange efficiency, and increase the convenience of maintenance. For example, small-diameter heat storage balls are set on the upper layer, and large-diameter heat storage balls are set on the lower layer. This is convenient for replacing heat storage balls and helps dust from different layers to eventually fall to the bottom and be discharged during cleaning. In this structure, the stirring mechanism can stir and clean the heat storage balls at different heights. This arrangement is simple and reliable. The stirring mechanism disturbs the bed of heat storage balls, causing the ash to fall off and be discharged from the bottom ash outlet. The replacement cycle of the heat storage balls can be extended, and cleaning can be achieved without disassembling the heat storage chamber, thereby improving thermal efficiency.

[0041] like Figures 1 to 7 As shown, the regenerator further comprises a detachably connected upper regenerator 3 and lower regenerator 1. A connecting portion 11 is bent at the bottom of the lower regenerator 1, and the burner 2 is connected to the connecting portion 11. Specifically, a seventh flange 22 is provided on one side of the burner 2, and a sixth flange 13 is provided at the end of the connecting portion 11. The seventh flange 22 and the sixth flange 13 are detachably connected by a butt joint. A layer of grille 9 is provided on the bottom of each of the upper and lower regenerators 3 and 1, respectively, and is filled with upper and lower layers of heat storage balls.

[0042] like Figures 1 to 7 、 Figure 15 As shown, further, a detachable ash unloading chamber 5 is provided on one side of the lower heat storage chamber 1. The ash unloading chamber 5 is provided on the bottom side of the bottommost grille 9. A telescopic mechanism is provided on the outside of the ash unloading chamber 5. The telescopic mechanism uses a cylinder 6. An ash receiving plate 63 is slidably provided on the inner wall of the ash unloading chamber 5. The piston rod 62 of the cylinder 6 is connected to the ash receiving plate 63. One end of the cylinder 6 has a cylinder seat 61, which is fixed to the outside of the ash unloading chamber 5 by the cylinder seat 61. The cylinder 6 is used to drive the ash receiving plate 63 to extend into the interior of the lower heat storage chamber 1 to receive dust. The ash receiving plate 63 is set to be U-shaped. Figure 5As shown, the ash receiving plate 63 is now stored in the ash unloading chamber 5, and the regenerator can operate normally, using the regenerator balls to store heat or support combustion. When dust removal is required, the cylinder 6 extends, controlling the ash receiving plate 63 to extend into the lower regenerator chamber 1 to receive dust, and then activates the stirring mechanism to disturb the regenerator balls on the upper side. This structure can collect dust during dust removal, preventing dust from falling into the bent connection portion 11 and causing blockage in the gas passage, which would affect subsequent combustion and the combustion efficiency of the smelting furnace.

[0043] like Figures 1 to 7 、 Figure 16 As shown, in the present invention, the stirring mechanism includes a motor 7, a stirring shaft 41, and stirring rods 43. Axle holes 15 are provided on both sides of the upper and lower heat storage chambers 3 and 1, respectively. The stirring shaft 41 is inserted into the shaft holes 15. Bearing blocks 4 are provided on both sides of the shaft holes 15 of the upper and lower heat storage chambers 3 and 1, respectively. The stirring shaft 41 is rotatably mounted on the inner wall of the bearing blocks 4. A shaft body 42 is provided in the middle of the stirring shaft 41, and a plurality of stirring rods 43 are evenly distributed around the outer wall of the shaft body 42. Specifically, a motor 7 is provided on the outer side of the lower heat storage chamber 1. The motor 7 is connected to a reduction gearbox 71. A connecting block 72 is provided on one side of the reduction gearbox 71. The connecting block 72 is sleeved on the outer side of the bearing block 4 and fixed to the outer wall of the lower heat storage chamber 1. The output shaft of the reduction gearbox 71 is connected to the stirring shaft 41 for transmission. A pulley 73 is provided at the end of the stirring shaft 41 on the other side. The two pulleys 73 are connected for transmission via a conveyor belt 74. When the motor 7 is started, the upper and lower stirring shafts 41 can be controlled to rotate, and the stirring rod 43 can be driven to rotate to disturb and clean the dust.

[0044] Furthermore, air holes 411 are provided inside the stirring shaft 41 and the shaft body 42, and injection holes 431 connected to the air holes 411 are provided inside the stirring rod 43. The air holes 411 of the stirring shaft 41 are connected to an external air supply device. When the stirring rod 43 rotates, high-pressure gas is synchronously injected from the stirring position, and the injection disturbance is caused from the stirring position to stir and disturb the surrounding heat storage balls to realize the injection of high-pressure gas, thereby achieving efficient dust cleaning.

[0045] like Figures 1 to 7 、 Figure 15 As shown, a ball discharge port 16 is provided on one side of the lower regenerator 1. The ball discharge port 16 is located above the grille 9 in the lower regenerator 1. A first flange 17 is provided on the outer side of the ball discharge port 16. A first cover 8 is detachably mounted on the first flange 17. To replace the regenerator balls later, the first cover 8 can be removed.

[0046] Furthermore, a second flange 14 is provided at the upper end of the lower regenerator 1, and a third flange 31 is provided at the lower end of the upper regenerator 3. The second flange 14 and the third flange 31 are integrally connected via a mounting block 33. The inner wall of the mounting block 33 is provided with an annular baffle 331. The grille 9 is mounted on the inner wall of the mounting block 33, with the bottom side of the grille 9 supported on the baffle 331. The mounting block 33 is used to install the upper grille 9 and the upper heat storage balls.

[0047] Furthermore, a second cover 10 is detachably connected to the grille 9 within the mounting block 33. This structure eliminates the need for opening the upper regenerator chamber 3. To replace the upper layer of heat storage balls, one only needs to open the first cover 8 on the bottom side, remove the balls, and then remove the second cover 10. The upper layer of heat storage balls can then be transferred to the bottom layer and removed through the ball unloading port 16. To install the heat storage balls, they are inserted through the gas inlet and outlet 32 at the top of the upper regenerator chamber 3.

[0048] like Figures 1 to 7 、 Figure 15 As shown, the bottom side of the lower regenerator 1 is provided with an ash discharge port 18, and a fourth flange 19 is provided outside the ash discharge port 18. A fifth flange 52 is provided on one side of the ash discharge chamber 5, and the fifth flange 52 is detachably connected to the fourth flange 19. The bottom side of the fourth flange 19 extends beyond the bottom side of the lower regenerator 1 and is reinforced with a plurality of first ribs 191. An extension plate 53 extends from the bottom side of the fifth flange 52, and second ribs 54 are provided on both sides of the extension plate 53 to strengthen the overall support strength. The extension plate 53 and the fifth flange 52 are attached to the fourth flange 19 to achieve the connection. A third cover 51 is detachably provided on both sides of the ash discharge chamber 5. When the dust receiving plate 63 has received a sufficient amount of dust, the dust receiving plate 63 is retracted into the ash discharge chamber 5, and the third cover 51 is removed for dust removal.

[0049] like Figures 1 to 15 As shown, in the present invention, the burner 2 is further structurally designed to achieve a transition connection between the burner 2 and the connecting portion 11, thereby achieving variable-diameter flow of the airflow.

[0050] In the present invention, a first airflow channel 12 with a gradually decreasing opening is defined within the connection portion 11. This channel is used to gradually gather the heat exchange gas within the regenerator, channeling it through the first airflow channel 12 to aid combustion. Conversely, the flue gas from the first airflow channel 12 is evenly dispersed within the regenerator, enabling the regenerator balls to store heat. The first airflow channel 12 has a rectangular cross-section, corresponding to the square shape of the regenerator, and its opening gradually decreases toward the sixth flange 13.

[0051] In the present invention, the burner 2 is sequentially provided with a second airflow channel 23 and a third airflow channel 26 interconnected with each other. The second airflow channel 23 gradually increases in size toward the third airflow channel 26. The second airflow channel 23 has a rectangular cross-section and abuts the first airflow channel 12. The third airflow channel 26 is a conical channel with a gradually increasing opening. During combustion, air flows through the first airflow channel 12 to the second airflow channel 23. The airflow first converges through the first airflow channel 12 and then through the second airflow channel 23 to the third airflow channel 26, where it mixes with the fuel gas and ignites and burns.

[0052] Furthermore, the inner wall of the third airflow channel 26 is symmetrically provided with a fourth airflow channel 24 and a fifth airflow channel 25. The cross section of the fourth airflow channel 24 is rectangular. The fourth airflow channel 24 and the second airflow channel 23 are symmetrically arranged. The opening of the fourth airflow channel 24 gradually decreases toward the second airflow channel 23 and docks with the second airflow channel 23; the opening of the fourth airflow channel 24 gradually increases toward the fifth airflow channel 25 and docks with the fifth airflow channel 25. The end of the fifth airflow channel 25 smoothly transitions to the third airflow channel 26. This structure designs the internal airflow channel of the burner 2 to achieve a smooth transition of the airflow from a rectangular channel to a circular channel. When the gas reaches the second airflow channel 23, the gas can diffuse through the conical third airflow channel 26. At the same time, the airflow can diffuse through the fourth airflow channel 24. Finally, the fifth airflow channel 25 and the third airflow channel 26 transition to achieve uniform diffusion and mixing of the gas.

[0053] Furthermore, two mounting tubes 21 are evenly distributed around the circumference of the burner 2, each with a mounting hole 211 disposed therein. The distal end of the mounting hole 211 communicates with the third airflow channel 26, and the mounting hole 211 is staggered with the fifth airflow channel 25. A fuel gun 212 and an ignition gun 213 are disposed within the mounting hole 211, respectively. The mounting holes 211 are located on the conical surface of the third airflow channel 26, where the thickness is greater, enabling more stable mounting of the fuel gun 212 and ignition gun 213. Furthermore, this location, located at the rear end of the airflow diffusion position, allows for sufficient mixing of the combustion and combustion-supporting hot gases, achieving sufficient combustion.

[0054] Of course, multiple fuel guns 212 can be provided, evenly distributed around the circumference of the burner 2, and the specific number of installations is determined according to the specific situation.

[0055] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A regenerative burner for aluminum smelting, characterized by: It includes a regenerator and a burner connected to the bottom of the regenerator. At least two layers of screens are arranged in the vertical direction in the heat storage chamber, and heat storage balls are installed on the screens; a gas inlet and outlet are opened on the top of the heat storage chamber; A plurality of stirring mechanisms are arranged in the heat storage chamber along the vertical direction. The number of the stirring mechanisms is the same as the number of the grilles. The stirring mechanisms are arranged above each layer of the grilles.

2. The regenerative burner for aluminum smelting according to claim 1, characterized in that: The heat storage chamber includes an upper heat storage chamber and a lower heat storage chamber that are detachably connected. The bottom side of the lower heat storage chamber is bent to provide a connecting portion, and the burner is connected to the connecting portion; a layer of grille is respectively provided on the bottom side of the upper heat storage chamber and the lower heat storage chamber.

3. The regenerative burner for aluminum smelting according to claim 2, characterized in that: A ash unloading chamber is detachably provided on one side of the lower heat storage chamber, and the ash unloading chamber is arranged on the bottom side of the grille. A telescopic mechanism is provided on the outer side of the ash unloading chamber, and an ash receiving plate is slidably provided on the inner wall of the ash unloading chamber. The telescopic mechanism is connected to the ash receiving plate and is used to drive the ash receiving plate to extend into the interior of the lower heat storage chamber to receive dust.

4. The regenerative burner for aluminum smelting according to claim 2, characterized in that: A ball unloading port is provided on one side of the lower heat storage chamber, and the ball unloading port is provided on the upper side of the grille in the lower heat storage chamber. A first flange is provided on the outer side of the ball unloading port, and a first cover is detachably provided on the first flange.

5. The regenerative burner for aluminum smelting according to claim 4, characterized in that: A second flange is provided at the upper end of the lower heat storage chamber, and a third flange is provided at the lower end of the upper heat storage chamber. The second flange and the third flange are connected as a whole through a mounting block. An annular baffle is provided on the inner wall of the mounting block. The grille is provided on the inner wall of the mounting block, and the bottom side of the grille is supported on the baffle.

6. The regenerative burner for aluminum smelting according to claim 5, characterized in that: A second cover is detachably connected to the grille arranged inside the installation block.

7. The regenerative burner for aluminum smelting according to claim 3, characterized in that: An ash discharge port is provided on the bottom side of the lower heat storage chamber, a fourth flange is provided on the outside of the ash discharge port, a fifth flange is provided on one side of the ash discharge chamber, and the fifth flange is detachably connected to the fourth flange.

8. The regenerative burner for aluminum smelting according to claim 2, characterized in that: A first air flow channel with a gradually decreasing opening is provided inside the connecting portion, and the cross-section of the first air flow channel is rectangular; a second air flow channel and a third air flow channel that are interconnected are sequentially provided inside the burner, and the opening of the second air flow channel gradually increases toward the direction of the third air flow channel, and the cross-section of the second air flow channel is rectangular. The second air flow channel is connected to the first air flow channel, and the third air flow channel is a conical channel with a gradually increasing opening.

9. The regenerative burner for aluminum smelting according to claim 8, characterized in that: A fourth air flow channel and a fifth air flow channel are symmetrically arranged on both sides of the inner wall of the third air flow channel. The cross-section of the fourth air flow channel is rectangular. The opening of the fourth air flow channel gradually decreases toward the second air flow channel and connects with the second air flow channel; the opening of the fourth air flow channel gradually increases toward the fifth air flow channel and connects with the fifth air flow channel. The end of the fifth air flow channel is smoothly transitioned to the third air flow channel.

10. The regenerative burner for aluminum smelting according to claim 9, characterized in that: The burner is provided with two mounting tubes evenly distributed on its circumference. A mounting hole is provided in the mounting tube. The end of the mounting hole is connected to the third air flow channel. The mounting hole is staggered with the fifth air flow channel. A fuel gun and an ignition gun are respectively provided in the mounting hole.

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