Rare earth metal electrolysis waste heat recovery device

Abstract

The utility model belongs to the field of electrolysis waste heat recovery, and particularly relates to a rare earth metal electrolysis waste heat recovery device which comprises a water tank. A cavity is formed in the inner wall of the water tank, a smoke pipe is spirally wound in the cavity, one end of the smoke pipe penetrates through the top of the water tank to be communicated with a smoke inlet pipe, the other end of the smoke pipe penetrates through the bottom of the water tank to be communicated with a smoke exhaust pipe, a rectangular groove is formed in one side of the inner wall of the water tank, a filter box is arranged in the rectangular groove, and the spiral section of the smoke pipe is in through connection with the filter box. And through the structural design that the smoke pipe is spirally wound around the cavity of the inner wall of the water tank, the efficient recycling function of smoke waste heat is achieved. The smoke pipe is spirally wound in the cavity of the water tank, so that the heat exchange time of high-temperature smoke is prolonged through a spiral path, meanwhile, the contact area of a traditional linear pipeline is increased through direct contact between the wall face of the smoke pipe and a water body in the water tank, and the problem that in the prior art, the waste heat recovery efficiency is low due to separation of the smoke pipe and a water pipe is solved. The heat conduction efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery from electrolysis, specifically a waste heat recovery device for rare earth metal electrolysis. Background Technology

[0002] Rare earth metal electrolysis refers to the process of extracting and purifying rare earth metals from rare earth compounds through electrolysis. In the process of rare earth metal smelting, high-temperature smelting is required, which generates a large amount of flue gas. The flue gas contains a certain amount of heat energy, and the waste heat of the flue gas can be recovered through a waste heat recovery device during the production process.

[0003] In the prior art, such as in CN216115462U, a waste heat recovery device for rare earth metal smelting and processing is disclosed. It includes a flue gas pipe, a hot water absorption tank fixedly connected to the outside of the flue gas pipe, a heat absorption pipe fixedly connected to the inside of the hot water absorption tank, a water outlet pipe fixedly connected to the hot water absorption tank, a connecting pipe fixedly connected to one end of the heat absorption pipe, a connecting cover connected to the inside of the connecting pipe by threads, a water inlet pipe fixedly connected to the inside of the connecting cover, a sealing ring bonded to the inside of the connecting pipe, and a limit block fixedly connected to the outside of the connecting pipe.

[0004] Although the aforementioned patent allows for direct contact between the heat-absorbing pipe and the flue gas inside the flue pipe, and preheats the water before it enters the heat-absorbing water tank, thus effectively improving the heat absorption efficiency of the device, the flue gas pipe and the water inlet pipe are separate with a gap in between. This results in a small contact area between the flue gas pipe and the water pipe, leading to low waste heat conduction efficiency and affecting the efficiency of waste heat recovery. Furthermore, the flue gas contains impurities and harmful gases, which cause pollution when directly emitted. Therefore, a rare earth metal electrolysis waste heat recovery device is proposed to address the above problems. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, the flue gas pipe and the water inlet pipe are separated with a gap in between, resulting in a small contact area between the flue gas pipe and the water pipe, which leads to low waste heat conduction efficiency and thus affects the efficiency of waste heat recovery. In addition, the flue gas contains impurities and harmful gases, and direct emission will cause pollution problems. This utility model proposes a rare earth metal electrolysis waste heat recovery device.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: A rare earth metal electrolysis waste heat recovery device of this utility model includes a water tank; the inner wall of the water tank is provided with a cavity, and a flue gas pipe is spirally wound inside the cavity. One end of the flue gas pipe passes through the top of the water tank and connects to the flue gas inlet pipe, and the other end passes through the bottom of the water tank and connects to the flue gas outlet pipe. A rectangular groove is provided on one side of the inner wall of the water tank, and a filter box is provided inside the rectangular groove. The spiral section of the flue gas pipe is connected to the filter box. A square frame is slidably connected inside the filter box. Activated carbon filter plates are snapped onto the front and back of the square frame. Spring-loaded limiting beads are provided at both ends of the activated carbon filter plates. A limiting groove and a circular groove at the end are provided on the inner wall of the square frame to cooperate with the limiting beads.

[0007] Preferably, the springs installed in the fixing holes at both ends of the activated carbon filter plate are elastically connected to the limiting beads, and the contact surface between the circular groove at the end of the limiting groove and the limiting beads is an arc-shaped slope structure.

[0008] Preferably, an inlet pipe is provided in the middle of the top surface of the water tank, and a drain pipe is connected through the middle of the bottom surface of the water tank, with the axis of the inlet pipe coinciding with the axis of the drain pipe.

[0009] Preferably, a square cover is provided on the other side edge of the top surface of the water tank, the square cover covering the rectangular groove and sealingly connecting with the outer edge of the filter box.

[0010] Preferably, the connection between the spiral section of the flue pipe and the filter box is located at the bend in the middle section of the flue pipe, and the internal cross-section of the filter box is 1.2-1.5 times the inner diameter of the flue pipe.

[0011] Preferably, the surface of the activated carbon filter plate is perpendicular to the sliding direction of the square frame, and the extension direction of the limiting groove is parallel to the insertion and withdrawal trajectory of the square frame.

[0012] The advantages of this utility model are:

[0013] 1. This utility model achieves efficient waste heat recovery from flue gas through a structural design of a spirally wound flue gas pipe within the cavity of the water tank. The flue gas pipe spirally wound within the cavity of the water tank allows the high-temperature flue gas to extend the heat exchange time through the spiral path. Simultaneously, the direct contact between the flue gas pipe wall and the water inside the tank increases the contact area compared to traditional straight pipes, solving the problem of low waste heat recovery efficiency caused by the separation of the flue gas pipe and water pipe in existing technologies, and improving heat conduction efficiency.

[0014] 2. This utility model achieves dynamic filtration of harmful substances in flue gas through a snap-fit ​​structure design between a sliding square frame inside the filter box and the activated carbon filter plate. After the flue gas enters the filter box through the spiral section of the flue gas pipe, it undergoes double adsorption through the vertically arranged activated carbon filter plate. Utilizing the elastic cooperation of the limiting bead and the spring, the filter plate is quickly locked under the guidance of the arc-shaped slope of the limiting groove, solving the problem of difficult replacement of traditional fixed filter screens. This shortens the time required for a single filter plate replacement and improves filtration efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the water tank structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the flue gas pipe structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the filter box structure of this utility model.

[0020] In the diagram: 1. Water tank; 2. Cavity; 3. Flue pipe; 4. Inlet pipe; 5. Exhaust pipe; 6. Rectangular groove; 7. Filter box; 8. Square frame; 9. Filter plate; 10. Spring; 11. Limiting bead; 12. Limiting groove; 13. Circular groove; 14. Water inlet pipe; 15. Drain pipe; 16. Square cover. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0022] Please see Figures 1-4As shown, a rare earth metal electrolysis waste heat recovery device includes a water tank 1; a cavity 2 is formed in the inner wall of the water tank 1, and a flue gas pipe 3 is spirally wound inside the cavity 2. One end of the flue gas pipe 3 passes through the top of the water tank 1 and connects to the flue gas inlet pipe 4, and the other end passes through the bottom of the water tank 1 and connects to the flue gas outlet pipe 5. A rectangular groove 6 is formed on one side of the inner wall of the water tank 1, and a filter box 7 is set inside the rectangular groove 6. The spiral section of the flue gas pipe 3 is connected to the filter box 7. A square frame 8 is slidably connected inside the filter box 7. Activated carbon filter plates 9 are snapped onto the front and back of the square frame 8. Limiting beads 11 with springs 10 are set at both ends of the activated carbon filter plates 9. Limiting grooves 12 that cooperate with the limiting beads 11 and a circular groove 13 at the end are formed in the inner wall of the square frame 8.

[0023] During operation, the high-temperature flue gas generated by electrolysis is introduced into the spiral pipeline from the inlet pipe 4 through the spirally wound flue gas pipe 3 within the cavity 2 of the water tank 1. As the flue gas flows spirally, it exchanges heat with the water in the water tank 1 through the pipe wall, and the heat is conducted to the water through the cavity 2, achieving waste heat recovery. Simultaneously, the flue gas enters the filter box 7 through the through-connection between the middle section of the flue gas pipe 3 and the filter box 7. Harmful substances are adsorbed by the activated carbon filter plate 9, which is snapped together by the square frame 8 on both sides. The filtered clean flue gas returns to the flue gas pipe 3 and is discharged through the exhaust pipe 5. The spiral flue gas pipe 3 design significantly increases the heat exchange area, solving the problem of insufficient contact area in traditional straight pipes and improving waste heat recovery efficiency. The through-connection between the filter box 7 and the flue gas pipe 3 enables simultaneous filtration and heat recovery, avoiding energy waste caused by equipment downtime for maintenance.

[0024] Furthermore, the springs 10 installed in the fixing holes at both ends of the activated carbon filter plate 9 are elastically connected to the limiting beads 11, and the contact surface between the circular groove 13 at the end of the limiting groove 12 and the limiting beads 11 is an arc-shaped slope structure.

[0025] During operation, the activated carbon filter plate 9 is pushed by the springs 10 at both ends to insert the limiting beads 11 into the limiting grooves 12 of the square frame 8. When the filter plate 9 is inserted, the limiting beads 11 slide along the arc-shaped slope of the limiting groove 12 into the circular groove 13 at the end to lock. When disassembling, the limiting beads 11 are disengaged from the circular groove 13 by applying force in the opposite direction, and the filter plate 9 can be pulled out. The matching design of the limiting beads 11 and the arc-shaped slope simplifies the disassembly and assembly steps of the filter plate 9 and solves the problem of cumbersome traditional bolt fixing operation. The elastic pressure of the springs 10 ensures that the filter plate 9 fits tightly with the square frame 8 to prevent flue gas leakage.

[0026] Furthermore, a water inlet pipe 14 is provided in the middle of the top surface of the water tank 1, and a drain pipe 15 is connected through the middle of the bottom surface of the water tank 1, with the axis of the water inlet pipe 14 coinciding with the axis of the drain pipe 15.

[0027] During operation, cold water is vertically injected through the inlet pipe 14 at the top of the water tank 1. After absorbing heat, it forms hot water which is discharged from the drain pipe 15 coaxially arranged at the bottom. The coaxial design allows the water flow to form a stable convection along the center of the water tank 1, avoiding the mixing of hot and cold water. The coaxial layout of the inlet pipe 14 and the drain pipe 15 optimizes the water flow path and improves the uniformity of heat exchange. The direction perpendicular to the water flow is orthogonal to the heat conduction direction of the spiral flue pipe 3, which enhances the heat absorption effect.

[0028] Furthermore, a square cover 16 is provided on the other side edge of the top surface of the water tank 1. The square cover 16 covers the rectangular groove 6 and is sealed to the outer edge of the filter box 7.

[0029] During operation, the square cover 16 covers the rectangular groove 6 and is tightly connected to the outer edge of the filter box 7 through a sealing structure. During maintenance, the square cover 16 is opened, and the square frame 8 can be pulled out directly along the rectangular groove 6 to replace the filter components. The sealing design of the square cover 16 prevents flue gas from escaping from the maintenance port, thus solving the environmental pollution problem of open structures.

[0030] Furthermore, the connection between the spiral section of the flue pipe 3 and the filter box 7 is located at the bend in the middle section of the flue pipe 3, and the internal cross-section of the filter box 7 is 1.2-1.5 times the inner diameter of the flue pipe 3.

[0031] During operation, the flue gas pipe 3 connects to the filter box 7 at the bend in the middle of the spiral section. The filter box 7 with its enlarged cross-section reduces the flue gas velocity, allowing the activated carbon filter plate 9 to fully adsorb harmful substances. The purified airflow returns to the flue gas pipe 3 to continue flowing. The mid-section bend design balances filtration efficiency and airflow velocity, avoiding excessive filtration resistance from affecting flue gas emissions.

[0032] Furthermore, the surface of the activated carbon filter plate 9 is perpendicular to the sliding direction of the square frame 8, and the extension direction of the limiting groove 12 is parallel to the insertion and withdrawal trajectory of the square frame 8.

[0033] During operation, the surface of the activated carbon filter plate 9 is perpendicular to the insertion and removal direction of the square frame 8, allowing the flue gas to penetrate the filter layer vertically. The extension direction of the limiting groove 12 is consistent with the movement trajectory of the square frame 8, ensuring that the filter plate 9 is installed stably. The vertical layout of the filter plate 9 extends the path of the flue gas through the activated carbon layer, improving the adsorption effect of harmful substances.

[0034] Working principle: High-temperature flue gas generated by rare earth metal electrolysis is introduced into flue gas pipe 3, which is spirally wound in the cavity 2 of water tank 1, through flue gas inlet pipe 4. During the spiral flow, the flue gas conducts heat to the water in water tank 1 through the wall of flue gas pipe 3 to achieve waste heat recovery. At the same time, part of the flue gas enters the filter box 7 through the bend in the middle section of flue gas pipe 3. The activated carbon filter plate 9, which is snapped on both sides of the square frame 8, adsorbs harmful substances. The filtered clean flue gas returns to flue gas pipe 3 and is discharged through exhaust pipe 5. Cold water is injected into water tank 1 through coaxial water inlet pipe 14 to absorb heat and is discharged from drain pipe 15. The activated carbon filter plate 9 is self-locked by limiting beads 11 driven by springs 10 at both ends, which slide along the limiting groove 12 on the inner wall of square frame 8 to the end circular groove 13. During maintenance, the filter components can be quickly replaced by opening the square cover 16 and pulling out the square frame 8. Finally, the efficient recovery of waste heat and the purification of flue gas are achieved in synergy.

[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, or similar improvements made within the theoretical and principle content of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rare earth metal electrolysis waste heat recovery device, characterized in that: Includes a water tank (1); the inner wall of the water tank (1) has a cavity (2), and a flue pipe (3) is spirally wound inside the cavity (2). One end of the flue pipe (3) passes through the top of the water tank (1) and connects to the inlet pipe (4), and the other end passes through the bottom of the water tank (1) and connects to the exhaust pipe (5). A rectangular groove (6) is opened on one side of the inner wall of the water tank (1), and a filter box (7) is set inside the rectangular groove (6). The spiral section of the flue pipe (3) is connected to the filter box (7), and a square frame (8) is slidably connected inside the filter box (7). The square frame (8) is snapped onto the activated carbon filter plate (9) on the front and back. The activated carbon filter plate (9) is provided with limiting beads (11) with springs (10) at both ends. The inner wall of the square frame (8) is provided with limiting grooves (12) that cooperate with the limiting beads (11) and a circular groove (13) at the end.

2. The rare earth metal electrolysis waste heat recovery device according to claim 1, characterized in that: The springs (10) installed in the fixing holes at both ends of the activated carbon filter plate (9) are elastically connected to the limiting beads (11), and the contact surface between the circular groove (13) at the end of the limiting groove (12) and the limiting beads (11) is an arc-shaped slope structure.

3. The rare earth metal electrolysis waste heat recovery device according to claim 1, characterized in that: The water tank (1) has an inlet pipe (14) in the middle of its top surface and a drain pipe (15) in the middle of its bottom surface. The axis of the inlet pipe (14) coincides with the axis of the drain pipe (15).

4. The rare earth metal electrolysis waste heat recovery device according to claim 1, characterized in that: A square cover (16) is provided on the other side edge of the top surface of the water tank (1). The square cover (16) covers the rectangular groove (6) and is sealed to the outer edge of the filter box (7).

5. The rare earth metal electrolysis waste heat recovery device according to claim 1, characterized in that: The connection between the spiral section of the flue pipe (3) and the filter box (7) is located at the bend in the middle section of the flue pipe (3), and the internal cross-section of the filter box (7) is 1.2-1.5 times the inner diameter of the flue pipe (3).

6. The rare earth metal electrolysis waste heat recovery device according to claim 1, characterized in that: The surface of the activated carbon filter plate (9) is perpendicular to the sliding direction of the square frame (8), and the extension direction of the limiting groove (12) is parallel to the insertion and withdrawal trajectory of the square frame (8).

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