Reduction rotary furnace suitable for vanadium redox flow battery electrolyte

Abstract

The invention discloses a reduction rotary furnace suitable for vanadium redox flow battery electrolyte, a feeding assembly and a furnace body are both arranged on a supporting assembly, a heating furnace tube is rotatably arranged on the supporting assembly and is driven by a rotation driving assembly to rotate around an axis, and the furnace body sleeves the outer side of the heating furnace tube and is rotatably connected with the heating furnace tube; a reducing feeding furnace tube is arranged at the feeding end of the heating furnace tube, the reducing feeding furnace tube is rotationally connected to the feeding assembly through a first dynamic sealing part, and the discharging end of the heating furnace tube is connected to a second dynamic sealing part to achieve discharging; a shaft core and a large-diameter spiral blade are arranged in the heating furnace pipe in the radial direction, a small-diameter spiral blade is arranged in the reducing feeding furnace pipe, the large-diameter spiral blade and the small-diameter spiral blade are both fixed to the shaft core, a plurality of air inlet main pipes connected to an external air source are arranged in the shaft core, and a plurality of air outlets are formed in the air inlet main pipes. The device has the characteristics of compact structure, convenience in operation, high safety, high reliability and the like, and full contact of gas and materials is realized.

Description

Technical Field

[0001] This invention relates to the field of new energy battery technology, specifically to a reduction rotary furnace suitable for vanadium redox flow battery electrolyte. Background Technology

[0002] In the reduction production process of vanadium redox flow battery electrolyte, existing continuous rotary kilns have certain technical defects when meeting specific process requirements: (1) Since the raw materials need to be in full contact with the reducing gas during the reduction process, if the reducing gas and the material are not in full or in a uniform manner, the product will be incompletely and unevenly reduced. The gas inlet of the existing rotary kiln is basically from one end of the furnace tube and out from the other end, which leads to uneven atmosphere before and after the furnace tube, resulting in incomplete material reaction.

[0003] (2) Since the raw material is ammonium vanadate, and the raw material is in the state of powder and water mixture, when the material is viscous, the screw feeder is prone to blockage or even damage.

[0004] (3) There are generally two design methods for the movement of materials inside the existing rotary kiln tubes: one is to set up lifting plates on the wall and control the material residence time by adjusting the inclination angle and rotation speed of the furnace tube. This control method has many influencing factors, such as inclination angle, rotation speed, and material repose angle, which makes it impossible to accurately control the material residence time; the other is to set up spiral pusher plates on the wall. Although this method can control the rotation speed and thus accurately control the material residence time, setting up spiral pusher plates reduces the cross-sectional area of ​​the effective space of the furnace tube, that is, reduces the cross-sectional area of ​​the inlet and outlet channels inside the furnace tube and forms partitions, thereby affecting the sufficiency of material contact with the reaction gas. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the shortcomings of existing rotary kilns, such as difficulty in achieving sufficient gas-material contact, inability to ensure smooth feeding, and inability to accurately control the material movement speed in the furnace tube. The invention provides a reduction rotary kiln suitable for vanadium redox flow battery electrolytes, which has sufficient gas-solid contact, smooth feeding, and precise controllable sintering time.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A rotary furnace for reducing vanadium redox flow battery electrolyte includes: a support assembly, a feeding assembly, a rotary drive assembly, a furnace body, and a heating furnace tube; the feeding assembly and the furnace body are both mounted on the support assembly, the heating furnace tube is rotatably mounted on the support assembly, and the heating furnace tube is configured to rotate about an axis under the drive of the rotary drive assembly; the furnace body is sleeved on the outside of the heating furnace tube and rotatably connected to the heating furnace tube; the feeding end of the heating furnace tube is provided with a reduced-diameter feeding furnace tube, the reduced-diameter feeding furnace tube passing through a first dynamic seal. The component is rotatably connected to the feeding assembly, and the discharge end of the heating furnace tube is connected to the second dynamic sealing component to realize discharge; the heating furnace tube is provided with a shaft core and a large-diameter spiral blade in the radial direction, and the reduced-diameter feeding furnace tube is provided with a small-diameter spiral blade. Both the large-diameter spiral blade and the small-diameter spiral blade are fixed on the shaft core. Multiple air inlet pipes are provided inside the shaft core, and each air inlet pipe is provided with multiple air outlets. The air inlet of the air inlet pipe is connected to the air inlet assembly that runs through the second dynamic sealing component to realize the delivery of external air source to the heating furnace tube.

[0007] As a further improvement of the present invention, the large-diameter spiral blades are evenly distributed with multiple air passage holes to achieve air passage communication between the large-diameter spiral blades and the multiple spiral cavities formed by the heating furnace tube.

[0008] As a further improvement of the present invention, the feeding assembly includes a feeder, a feeding bin, and a feeding pipe. The inlet of the feeding bin is connected to the feeder, and the outlet of the feeding bin is connected to the feeding pipe. One side of the feeding pipe is rotatably connected to the reduced-diameter feeding furnace tube through a first dynamic sealing component, and the other side of the feeding pipe is provided with a pushing component to push the material in the feeding pipe into the reduced-diameter feeding furnace tube.

[0009] As a further improvement of the present invention, the pushing assembly includes a hydraulic cylinder and a plunger. The plunger is slidably disposed in the feed pipe. The hydraulic cylinder is fixed to the side of the feed pipe and connected to the plunger to push the plunger to slide in the feed pipe and realize material pushing.

[0010] As a further improvement of the present invention, the first dynamic sealing component is a feed hood.

[0011] As a further improvement of the present invention, the second dynamic sealing component is a discharge hood, the top of which is provided with an exhaust port to realize the exhaust of exhaust gas in the heating furnace tube, and the bottom of which is provided with a discharge port to realize the discharge of material in the heating furnace tube.

[0012] As a further improvement of the present invention, the air intake assembly includes a rotary joint, a rotary air intake pipe and a fixed air intake pipe. The rotary joint is disposed inside the discharge hood. One end of the fixed air intake pipe is connected to an external air source, and the other end of the fixed air intake pipe extends into the discharge hood and is connected to the rotary joint. One end of the rotary air intake pipe is connected to the main air intake pipe, and the other end of the rotary air intake pipe is connected to the rotary joint.

[0013] As a further improvement of the present invention, the support assembly includes a bottom beam frame.

[0014] As a further improvement of the present invention, the rotary drive assembly includes rolling rings and support rollers. Rolling rings are respectively provided on both sides of the heating furnace tube. The rolling rings cooperate with the support rollers provided on the support assembly to realize the rotational support of the heating furnace tube.

[0015] Compared with the prior art, the advantages of the present invention are as follows: This invention relates to a rotary kiln for reducing vanadium redox flow battery electrolytes. By setting a reduced-diameter feed tube at the feed end of the heating furnace tube, material backflow can be effectively prevented. A shaft and large-diameter helical blades are arranged radially inside the heating furnace tube, while small-diameter helical blades are arranged inside the reduced-diameter feed tube. Both the large-diameter and small-diameter helical blades are fixed on the shaft, achieving synchronous rotation of the large-diameter and small-diameter helical blades. This allows the material to be rapidly propelled forward within the reduced-diameter feed tube and the heating furnace tube, preventing material accumulation. Simultaneously, the material propulsion speed can be precisely controlled by adjusting the rotation speed of the heating furnace tube. Furthermore, multiple main air inlets are arranged inside the shaft, each with multiple air outlets. The air inlets of the main air inlets are connected to an air inlet assembly penetrating inside the second dynamic seal component. This allows external air sources to be delivered to the heating furnace tube through the main air inlets and distributed radially along the heating furnace tube, improving the uniformity of air source distribution in various areas of the heating furnace tube, ensuring sufficient contact between gas and material, and preventing material agglomeration within the heating furnace tube. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structural principle of a reduction rotary furnace suitable for vanadium redox flow battery electrolyte in a specific embodiment of the present invention.

[0017] Legend: 1. Feeder; 2. Feed hood; 3. Furnace body; 4. Heating furnace tube; 5. Discharge hood; 6. Rotary joint; 7. Bottom beam frame; 8. Hydraulic cylinder; 9. Plunger; 10. Feed bin; 11. Feed pipe; 12. Reduced diameter feed furnace tube; 13. Small diameter spiral blade; 14. Shaft core; 15. Air passage hole; 16. Large diameter spiral blade; 17. Main air inlet pipe; 18. Air outlet; 19. Roller ring; 20. Rotary air inlet pipe; 21. Exhaust port; 22. Fixed air inlet pipe; 23. Support roller. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0019] In the description of this invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more unless otherwise explicitly specified.

[0021] Example like Figure 1 As shown, the rotary furnace for reducing vanadium redox flow battery electrolyte of the present invention includes: a bottom beam frame 7, a feeding assembly, a rotary drive assembly, a furnace body 3, and a heating furnace tube 4. The feeding assembly and the furnace body 3 are both mounted on the bottom beam frame 7. The heating furnace tube 4 is rotatably mounted on the bottom beam frame 7 and configured to rotate around an axis under the drive of the rotary drive assembly. The furnace body 3 is sleeved on the outside of the heating furnace tube 4 and rotatably connected to it, thereby achieving heating and heat preservation of the heating furnace tube 4. The feeding end of the heating furnace tube 4 is provided with a reduced-diameter feeding furnace tube 12 to prevent material backflow. The reduced-diameter feeding furnace tube 12 is rotatably connected to the feeding assembly via a feeding hood 2. The discharge end of the heating furnace tube 4 is connected to a discharge hood 5. The top of the discharge hood 5 is provided with an exhaust port 21 to discharge exhaust gas from the heating furnace tube 4, and the bottom of the discharge hood 5 is provided with a discharge port to discharge material from the heating furnace tube 4. The heating furnace tube 4 has a radially arranged shaft 14 and large-diameter spiral blades 16 inside, while the reduced-diameter feeding furnace tube 12 has small-diameter spiral blades 13 inside. Both the large-diameter spiral blades 16 and the small-diameter spiral blades 13 are fixed on the shaft 14 and driven to rotate by the shaft 14. During the rotation of the heating furnace tube 4, the small-diameter spiral blades 13 rotate synchronously to rapidly advance the material, preventing material accumulation in the feeding furnace tube 12; the large-diameter spiral blades 16 rotate synchronously to advance the material forward. The material advancement speed can be precisely controlled by controlling the rotation speed of the heating furnace tube 4, ensuring precise control of the sintering time.

[0022] Furthermore, multiple air inlet pipes 17 are provided inside the shaft core 14, and each air inlet pipe 17 is provided with multiple air outlets 18. The air inlets of the air inlet pipes 17 are connected to the air inlet assembly that runs through the inside of the discharge hood 5, so as to realize the external air source to be delivered to the heating furnace tube 4 and evenly distributed in the heating furnace tube 4 to ensure that the gas and the material are in full contact.

[0023] In this embodiment, the air intake assembly includes a rotary joint 6, a rotary air intake pipe 20, and a fixed air intake pipe 22. The rotary joint 6 is disposed inside the discharge hood 5. One end of the fixed air intake pipe 22 is connected to an external air source, and the other end of the fixed air intake pipe 22 extends into the discharge hood 5 and is connected to the rotary joint 6. One end of the rotary air intake pipe 20 is connected to the main air intake pipe 17, and the other end of the rotary air intake pipe 20 is connected to the rotary joint 6, thereby achieving a dynamic and static sealing of the air intake pipe and ensuring that the external air source is stably delivered to the heating furnace tube 4.

[0024] like Figure 1 As shown, multiple air passage holes 15 are evenly distributed on the large-diameter spiral blade 16 to achieve air passage communication between the large-diameter spiral blade 16 and the multiple spiral cavities formed by the heating furnace tube 4, ensuring that the exhaust gas generated in each spiral cavity flows smoothly and is discharged.

[0025] like Figure 1 As shown, the feeding assembly includes a feeder 1, a feed bin 10, and a feed pipe 11. The feed bin 10 is used to receive ammonium vanadate material, and the inlet of the feed bin 10 is connected to the feeder 1, while the outlet of the feed bin 10 is connected to the feed pipe 11. One side of the feed pipe 11 is rotatably connected to the reduced-diameter feed furnace tube 12 via a feed hood 2, and the other side of the feed pipe 11 is provided with a pusher assembly to push the ammonium vanadate material in the feed pipe 11 into the reduced-diameter feed furnace tube 12.

[0026] like Figure 1 As shown, the feeding assembly includes a hydraulic cylinder 8 and a plunger 9. The plunger 9 is slidably disposed inside the feed pipe 11. The hydraulic cylinder 8 is fixed to the side of the feed pipe 11 and connected to the plunger 9 to push the plunger 9 to slide within the feed pipe 11, thereby pushing the ammonium vanadate material. Specifically, the movement of the hydraulic cylinder 8 provides sufficient pushing force to the plunger 9, causing the plunger 9 to push back and forth within the feed pipe 11, ensuring that the material is pushed from front to back within the feed pipe 11, achieving uniform feeding of the material into the reduced-diameter feed tube 12. The hydraulically driven plunger feeding method provides a large pushing force, ensuring smooth feeding of viscous materials.

[0027] like Figure 1 As shown, the rotary drive assembly includes a rolling ring 19 and a support roller 23. Rolling rings 19 are respectively provided on the left and right sides of the heating furnace tube 4. The rolling rings 19 cooperate with the support rollers 23 provided on the support assembly to realize the rotational support of the heating furnace tube 4.

[0028] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A rotary furnace for reducing vanadium redox flow battery electrolyte, characterized in that, include: The furnace includes a support assembly, a feeding assembly, a rotary drive assembly, a furnace body (3), and a heating furnace tube (4). The feeding assembly and furnace body (3) are both mounted on the support assembly. The heating furnace tube (4) is rotatably mounted on the support assembly and configured to rotate around an axis under the drive of the rotary drive assembly. The furnace body (3) is fitted over the outside of the heating furnace tube (4) and rotatably connected to it. The feeding end of the heating furnace tube (4) is provided with a reduced-diameter feeding furnace tube (12), which is rotatably connected to the feeding assembly via a first dynamic sealing component. The discharge end of the heating furnace tube (4)... Connected to the second dynamic sealing component to realize material discharge; the heating furnace tube (4) is provided with a shaft core (14) and a large diameter spiral blade (16) in the radial direction, and the reduced diameter feeding furnace tube (12) is provided with a small diameter spiral blade (13). The large diameter spiral blade (16) and the small diameter spiral blade (13) are both fixed on the shaft core (14). Multiple air inlet pipes (17) are provided inside the shaft core (14). Each air inlet pipe (17) is provided with multiple air outlets (18). The air inlet of the air inlet pipe (17) is connected to the air inlet assembly that runs through the second dynamic sealing component to realize the external air source to be delivered to the heating furnace tube (4).

2. The rotary furnace for reducing vanadium redox flow battery electrolyte according to claim 1, characterized in that, The large-diameter spiral blade (16) is evenly distributed with multiple air passage holes (15) to achieve air passage communication between the large-diameter spiral blade (16) and the multiple spiral cavities formed by the heating furnace tube (4).

3. The rotary furnace for reducing vanadium redox flow battery electrolyte according to claim 2, characterized in that, The feeding assembly includes a feeder (1), a feeding bin (10), and a feeding pipe (11). The inlet of the feeding bin (10) is connected to the feeder (1), and the outlet of the feeding bin (10) is connected to the feeding pipe (11). One side of the feeding pipe (11) is rotatably connected to the reduced diameter feeding furnace tube (12) through a first dynamic sealing component. The other side of the feeding pipe (11) is provided with a pushing component to push the material in the feeding pipe (11) into the reduced diameter feeding furnace tube (12).

4. The rotary furnace for reducing vanadium redox flow battery electrolyte according to claim 3, characterized in that, The material pushing assembly includes a hydraulic cylinder (8) and a plunger (9). The plunger (9) is slidably disposed in the feed pipe (11). The hydraulic cylinder (8) is fixed to the side of the feed pipe (11) and connected to the plunger (9) to push the plunger (9) to slide in the feed pipe (11) to realize material pushing.

5. The rotary furnace for reducing vanadium redox flow battery electrolyte according to claim 3, characterized in that, The first dynamic sealing component is the feed hood (2).

6. The rotary furnace for reducing vanadium redox flow battery electrolyte according to claim 2, characterized in that, The second dynamic sealing component is a discharge hood (5). The top of the discharge hood (5) is provided with an exhaust port (21) to realize the exhaust of the tail gas in the heating furnace tube (4). The bottom of the discharge hood (5) is provided with a discharge port to realize the discharge of the material in the heating furnace tube (4).

7. The rotary furnace for reducing vanadium redox flow battery electrolyte according to claim 6, characterized in that, The air intake assembly includes a rotary joint (6), a rotary air intake pipe (20), and a fixed air intake pipe (22). The rotary joint (6) is located inside the discharge hood (5). One end of the fixed air intake pipe (22) is connected to an external air source, and the other end of the fixed air intake pipe (22) extends into the discharge hood (5) and is connected to the rotary joint (6). One end of the rotary air intake pipe (20) is connected to the main air intake pipe (17), and the other end of the rotary air intake pipe (20) is connected to the rotary joint (6).

8. The rotary furnace for reducing vanadium redox flow battery electrolytes according to any one of claims 1 to 7, characterized in that, The support components include a bottom beam frame (7).

9. The rotary furnace for reducing vanadium redox flow battery electrolytes according to any one of claims 1 to 7, characterized in that, The rotary drive assembly includes a rolling ring (19) and a support roller (23). The heating furnace tube (4) is provided with rolling rings (19) on both sides. The rolling rings (19) cooperate with the support rollers (23) provided on the support assembly to realize the rotational support of the heating furnace tube (4).

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