Alumina pipeline leaching heat exchange device

Abstract

The utility model belongs to alumina dissolution heat exchange technical field relates to a kind of alumina pipeline dissolution heat exchange device, including low temperature slurry pipe, high temperature slurry pipe is fixedly connected with low temperature slurry pipe outside, the utility model uses when ore pulp flows in the inside of low temperature slurry pipe and high temperature slurry pipe, the use of connecting flange and fastening screw, so that the detachable maintenance of high temperature slurry pipe can be carried out, not only increase the flexibility of high temperature slurry pipe in actual use, when encountering high temperature slurry pipe blockage, the high temperature slurry pipe of blocked area can be disassembled and replaced, the convenience of high temperature slurry pipe dredging is improved, maintenance cost is reduced, the use of irregular taper inner wall, helical guide vane and high-frequency pulse electromagnetic coil reduces the possibility of scab inside low temperature slurry pipe and high temperature slurry pipe, reduces the possibility of production accident due to scab and pipe blockage.

Description

Technical Field

[0001] This utility model belongs to the field of alumina leaching heat exchange technology, and relates to an alumina pipeline leaching heat exchange device. Background Technology

[0002] The alumina pipeline leaching heat exchanger is the core equipment in the Bayer process for alumina production. It performs three main functions: slurry heating, leaching reaction, and waste heat recovery. It mainly consists of an outer tube and an inner tube, which allows low-temperature and high-temperature slurries to flow through multiple layers of tubes, thereby improving the efficiency of heat recovery.

[0003] For example, patent CN205115070U discloses a low-speed alumina pipeline leaching heat exchange device, which describes that it "includes an outer tube and an inner tube, with the slurry in the inner tube flowing in opposite directions to the heating medium between the inner and outer tubes, and the inner tube wall having a periodically irregular variable cross-section. The inner tube can be a single tube or multiple tubes depending on actual needs, but all are corrugated inner tubes. Using the alumina pipeline leaching heat exchange device of this utility model, a heat exchange effect 1.5 to 3 times higher than that of traditional alumina pipeline heat exchange devices can be obtained, while effectively suppressing the formation of slurry scale inside the tube, and having the characteristics of simple structure, it can be widely used in alumina engineering."

[0004] When using the above technology, the following technical problems were found in the existing technology: When performing leaching heat exchange on alumina pipes, due to long-term use, scaling will still occur on the inner wall of the pipe. The crystal nuclei formed by the association of ions in the slurry will be adsorbed on the inner wall of the outer tube, increasing the risk of scaling again and causing pipe blockage, thus increasing the possibility of production accidents. Utility Model Content

[0005] The technical problem this invention aims to solve is that during the leaching heat exchange of alumina pipes, long-term use can lead to scaling on the inner wall of the pipes. Crystal nuclei formed by the association of ions in the slurry can be adsorbed onto the inner wall of the outer casing, increasing the risk of re-scaling and causing pipe blockage, thus increasing the likelihood of production accidents.

[0006] The present invention discloses an alumina pipeline leaching heat exchange device, comprising a low-temperature slurry pipe, a high-temperature slurry pipe fixedly connected to the outside of the low-temperature slurry pipe, a high-temperature slurry inlet at one end of the high-temperature slurry pipe, and a high-temperature slurry outlet at the end of the high-temperature slurry pipe away from the high-temperature slurry inlet.

[0007] A detachable component is located in the middle of the outer side of the high-temperature slurry pipe, and the detachable component includes a protective mechanism inside;

[0008] The self-cleaning scar assembly is located inside the high-temperature slurry pipe. The self-cleaning scar assembly includes a scar melting mechanism located outside the high-temperature slurry pipe. The scar melting mechanism works in conjunction with the self-cleaning scar assembly.

[0009] The detachable component includes a connecting flange and fastening screws. The high-temperature slurry pipe is fixedly connected to the middle of the connecting flange. The high-temperature slurry pipe can be spliced ​​and disassembled through the connecting flange. Multiple sets of fastening screws are provided on the middle of the outer side of the connecting flange. The fastening screws are used to connect two sets of connecting flanges.

[0010] The self-cleaning scar assembly includes an irregularly tapered inner wall and a spiral guide plate. The inner wall of the high-temperature slurry pipe is fixedly connected to the irregularly tapered inner wall, and the outer side of the low-temperature slurry pipe is fixedly connected to the spiral guide plate.

[0011] The protective mechanism includes a protective shell, arc-shaped fasteners, and rivets. A protective shell is provided on the outside of the high-temperature slurry pipe near the connecting flange. Arc-shaped fasteners are provided on both sides of the outer side of the protective shell, and rivets are fixedly connected to both sides of the outer side of the arc-shaped fasteners.

[0012] The scar-reducing mechanism includes an electromagnetic generation module and a high-frequency pulse electromagnetic coil. The electromagnetic generation module is fixedly connected to one side of the arc-shaped fastener. The output end of the electromagnetic generation module is fixedly connected to the high-frequency pulse electromagnetic coil, which is located outside the high-temperature slurry pipe.

[0013] A suspension block is fixedly connected to the top of the outer side of the arc-shaped fastener, and an adhesive groove is provided in the middle of the outer side of the protective shell.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: By using detachable components and self-cleaning components, when the slurry flows inside the low-temperature slurry pipe and the high-temperature slurry pipe, the use of connecting flanges and fastening screws allows for disassembly maintenance of the high-temperature slurry pipe. This not only increases the flexibility of the high-temperature slurry pipe in actual use, but also allows for disassembly and replacement of the high-temperature slurry pipe in the event of blockage, improving the convenience of unblocking the high-temperature slurry pipe and reducing maintenance costs. The use of irregular tapered inner wall, spiral guide vanes, and high-frequency pulse electromagnetic coils reduces the possibility of ion association of the slurry inside the low-temperature slurry pipe and the high-temperature slurry pipe, causing crystals to adsorb on the inner wall of the high-temperature slurry pipe and thus forming scale, reducing the possibility of production accidents caused by pipe blockage due to scale formation.

[0015] By using suspension blocks and adhesive grooves, the low-temperature slurry pipes and high-temperature slurry pipes are hoisted and stabilized by the suspension blocks, making them more stable during use. Simultaneously, the two sets of suspension blocks located on both sides of the connecting flange further increase the stability of the connecting flange in actual use. When the connecting flange is protected by the protective shell, sealant is sprayed into the adhesive groove, further increasing the sealing performance of the protective shell and improving its protective performance for the connecting flange. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the high-temperature slurry pipe of this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the protective shell of this utility model.

[0019] Figure 3 This is a schematic diagram of the irregular tapered inner wall of this utility model.

[0020] Figure 4 This is a schematic diagram of the structure of the low-temperature slurry pipe of this utility model.

[0021] In the diagram: 1. Low-temperature slurry pipe; 2. High-temperature slurry pipe; 3. High-temperature slurry inlet; 4. High-temperature slurry outlet; 5. Connecting flange; 6. Fastening screw; 7. Irregularly tapered inner wall; 8. Spiral guide vane; 9. Protective shell; 10. Arc-shaped fastener; 11. Rivet; 12. Electromagnetic generation module; 13. High-frequency pulse electromagnetic coil; 14. Suspension block; 15. Adhesive groove. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0024] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] Example 1

[0027] like Figure 1 - Figure 4 As shown, an alumina pipe leaching heat exchange device includes a low-temperature slurry pipe 1, a high-temperature slurry pipe 2 fixedly connected to the outside of the low-temperature slurry pipe 1, a high-temperature slurry inlet 3 opened at one end of the high-temperature slurry pipe 2, and a high-temperature slurry outlet 4 opened at the end of the high-temperature slurry pipe 2 away from the high-temperature slurry inlet 3.

[0028] A detachable component is located on the outer middle of the high-temperature slurry pipe 2, and the detachable component includes a protective mechanism inside;

[0029] The self-cleaning scar assembly is located inside the high-temperature slurry pipe 2. The self-cleaning scar assembly includes a scar melting mechanism located outside the high-temperature slurry pipe 2. The scar melting mechanism works in conjunction with the self-cleaning scar assembly.

[0030] The detachable component includes a connecting flange 5 and fastening screws 6. The high-temperature slurry pipe 2 is fixedly connected to the middle of the connecting flange 5. The high-temperature slurry pipe 2 can be spliced ​​and disassembled through the connecting flange 5. Multiple sets of fastening screws 6 are provided on the outer middle of the connecting flange 5. The fastening screws 6 are used to connect two sets of connecting flanges 5.

[0031] The self-cleaning scar assembly includes an irregularly tapered inner wall 7 and a spiral guide plate 8. The irregularly tapered inner wall 7 is fixedly connected to the inner side wall of the high-temperature slurry pipe 2, and the spiral guide plate 8 is fixedly connected to the outer side of the low-temperature slurry pipe 1.

[0032] The protective mechanism includes a protective shell 9, arc-shaped fasteners 10, and rivets 11. The protective shell 9 is provided on the outside of the high-temperature slurry pipe 2 near the connecting flange 5. Arc-shaped fasteners 10 are provided on both sides of the outer side of the protective shell 9. Rivets 11 are fixedly connected to both sides of the outer side of the arc-shaped fasteners 10.

[0033] The scar-reducing mechanism includes an electromagnetic generation module 12 and a high-frequency pulse electromagnetic coil 13. The electromagnetic generation module 12 is fixedly connected to one side of the arc-shaped fastener 10. The output end of the electromagnetic generation module 12 is fixedly connected to the high-frequency pulse electromagnetic coil 13. The high-frequency pulse electromagnetic coil 13 is located outside the high-temperature slurry pipe 2.

[0034] During operation, the device is first connected to an external power supply, and then to an external control module. The electronic components in this technical solution are driven by the cooperation of the external control module and the power supply. The external control module is existing technology and should be well known to those skilled in the art, so it will not be described in detail in this technical solution.

[0035] Based on actual production needs, select an appropriate length and splice multiple sets of high-temperature slurry pipes 2 with connecting flanges 5. Then, tighten the screws 6 for fixation and sealing. Place flexible graphite and metal spiral wound gaskets at the connecting flanges 5. Due to the high stability of the flexible graphite, the connecting flanges 5, in conjunction with the metal spiral wound gaskets, have a longer service life. This reduces the possibility of frequent maintenance due to reduced sealing performance of the connecting flanges 5, further reducing the subsequent maintenance costs of the high-temperature slurry pipes 2. At the same time, through the cooperation of the connecting flanges 5 and the fastening screws 6, the high-temperature slurry pipes 2 can be flexibly disassembled and assembled when facing different usage conditions, improving the practicality and flexibility of the device.

[0036] Then, the protective shell 9 is placed over the outside of the high-temperature slurry pipe 2 at the connecting flange 5. At this time, the curved fasteners 10 are used to fix both sides of the protective shell 9, so that the protective shell 9 is firmly installed on the outside of the high-temperature slurry pipe 2, providing all-round coverage of the connecting flange 5. This improves the protection of the connecting flange 5 by the protective shell 9, reduces the corrosion and impact of the external environment on the connecting flange 5, and also reduces the possibility of leakage due to damage to the connecting flange 5 when the connecting flange 5 is impacted. The use of the protective shell 9 further improves the service life of the connecting flange 5.

[0037] The low-temperature slurry and slurry processing device are connected to the low-temperature slurry pipe 1. The slurry processing device is installed on the side close to the high-temperature slurry inlet 3. Then, the outlet of the slurry processing device is connected to the high-temperature slurry inlet 3 to inject the high-temperature slurry into the high-temperature slurry pipe 2. Since the low-temperature slurry pipe 1 is located inside the high-temperature slurry pipe 2, when the high-temperature slurry is injected into the high-temperature slurry pipe 2, the low-temperature slurry inside the low-temperature slurry pipe 1 will be heated by the high-temperature slurry, preheating the low-temperature slurry and recovering the waste heat of the high-temperature slurry.

[0038] When the high-temperature slurry flows inside the high-temperature slurry pipe 2 and outside the low-temperature slurry pipe 1, it is... Figure 3It is known that the irregular conical inner wall 7 is irregular in shape and has a continuous gradual change in diameter with small fluctuations. Electrolytic polishing of the surface of the irregular conical inner wall 7 allows it to achieve a surface thickness of Ra = 0.1 μm, which significantly reduces the adhesion of scale. Spraying a highly hydrophobic nano-coating also reduces the adhesion points of crystal nuclei inside the slurry, thus reducing the occurrence of scale inside the high-temperature slurry pipe 2. Furthermore, the irregular diameter and surface irregularity of the irregular conical inner wall 7 inside the high-temperature slurry pipe 2 induce periodic turbulence, which can peel off the newly formed scale layer, further reducing the occurrence of scale inside the irregular conical inner wall 7. At the same time, a spiral guide vane 8 is provided on the outside of the low-temperature slurry pipe 1. The spiral guide vane 8 can force the high-temperature slurry inside the high-temperature slurry pipe 2 to rotate, increasing the shear force of the slurry on the inside of the high-temperature slurry pipe 2, further improving the peeling of the initial scale layer.

[0039] When the slurry flows inside the low-temperature slurry pipe 1 and the high-temperature slurry pipe 2, the electromagnetic generation module 12 on the outside of the arc-shaped fastener 10 drives the high-frequency pulse electromagnetic coil 13 to start working, generating a high-frequency pulse electromagnetic field. Because the ions inside the slurry associate with each other through electrostatic force, and then form crystal nuclei, they adhere to the inner wall of the high-temperature slurry pipe 2 to form a scale layer. The Lorentz force generated by the high-frequency pulse electromagnetic field can break up the ion pairs, which has the function of inhibiting the formation of crystal nuclei and reducing the generation of scale layer. This reduces the possibility of scaling inside the high-temperature slurry pipe 2. If a high-frequency pulse electromagnetic field is used, the material of the low-temperature slurry pipe 1 and the high-temperature slurry pipe 2 should be replaced with stainless steel to reduce the possibility of eddy current heating generated inside the carbon steel low-temperature slurry pipe 1 and the high-temperature slurry pipe 2 by the electromagnetic field.

[0040] The use of detachable components and self-cleaning components allows for disassembly and maintenance of the high-temperature slurry pipe 2 when the slurry flows inside the low-temperature slurry pipe 1 and the high-temperature slurry pipe 2, thanks to the connecting flange 5 and fastening screws 6. This not only increases the flexibility of the high-temperature slurry pipe 2 in actual use, but also allows for disassembly and replacement of the blocked area when the high-temperature slurry pipe 2 becomes clogged, improving the ease of unblocking the high-temperature slurry pipe 2 and reducing maintenance costs. The use of the irregular tapered inner wall 7, the spiral guide vane 8, and the high-frequency pulse electromagnetic coil 13 reduces the possibility of ion association of the slurry inside the low-temperature slurry pipe 1 and the high-temperature slurry pipe 2, which causes crystals to adsorb onto the inner wall of the high-temperature slurry pipe 2 and thus form scale. This reduces the possibility of production accidents caused by pipe blockage due to scale formation.

[0041] Example 2

[0042] like Figure 1 - Figure 2As shown, a suspension block 14 is fixedly connected to the top outer side of the arc-shaped fastener 10, and an adhesive groove 15 is provided in the middle of the outer side of the protective shell 9.

[0043] By using the suspension block 14 and the adhesive groove 15, when using the low-temperature slurry pipe 1 and the high-temperature slurry pipe 2, the suspension block 14 is used to suspend and stabilize the low-temperature slurry pipe 1 and the high-temperature slurry pipe 2, making the low-temperature slurry pipe 1 and the high-temperature slurry pipe 2 more stable during use. At the same time, the two sets of suspension blocks 14 are located on both sides of the connecting flange 5, which further increases the stability of the connecting flange 5 in actual use. When the connecting flange 5 is protected by the protective shell 9, sealant is sprayed into the adhesive groove 15, which further increases the sealing performance of the protective shell 9 and improves the protective performance of the protective shell 9 for the connecting flange 5.

[0044] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. The present utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An alumina pipeline leaching heat exchange device, characterized in that: It includes a low-temperature slurry pipe (1), a high-temperature slurry pipe (2) is fixedly connected to the outside of the low-temperature slurry pipe (1), a high-temperature slurry inlet (3) is opened at one end of the high-temperature slurry pipe (2), and a high-temperature slurry outlet (4) is opened at the end of the high-temperature slurry pipe (2) away from the high-temperature slurry inlet (3); A detachable component is located in the middle of the outer side of the high-temperature slurry pipe (2), and the detachable component includes a protective mechanism inside; The self-cleaning scar assembly is located inside the high-temperature slurry pipe (2). The self-cleaning scar assembly includes a scar melting mechanism located outside the high-temperature slurry pipe (2). The scar melting mechanism works in conjunction with the self-cleaning scar assembly.

2. The alumina pipeline leaching heat exchange device according to claim 1, characterized in that: The detachable component includes a connecting flange (5) and fastening screws (6). The high-temperature slurry pipe (2) is fixedly connected to the middle of the connecting flange (5). The high-temperature slurry pipe (2) can be spliced ​​and disassembled through the connecting flange (5). Multiple sets of fastening screws (6) are provided on the middle of the outer side of the connecting flange (5). The fastening screws (6) are used to connect two sets of connecting flanges (5).

3. The alumina pipeline leaching heat exchange device according to claim 2, characterized in that: The self-cleaning scar assembly includes an irregular tapered inner wall (7) and a spiral guide plate (8). The inner wall of the high-temperature slurry pipe (2) is fixedly connected to the irregular tapered inner wall (7), and the outer side of the low-temperature slurry pipe (1) is fixedly connected to the spiral guide plate (8).

4. The alumina pipeline leaching heat exchange device according to claim 3, characterized in that: The protective mechanism includes a protective shell (9), an arc-shaped fastener (10), and a rivet (11). The protective shell (9) is provided on the outside of the high-temperature slurry pipe (2) near the connecting flange (5). Arc-shaped fasteners (10) are provided on both sides of the outer side of the protective shell (9). Rivets (11) are fixedly connected to both sides of the outer side of the arc-shaped fasteners (10).

5. The alumina pipeline leaching heat exchange device according to claim 4, characterized in that: The scar-reducing mechanism includes an electromagnetic generating module (12) and a high-frequency pulse electromagnetic coil (13). The electromagnetic generating module (12) is fixedly connected to one side of the arc-shaped fastener (10). The output end of the electromagnetic generating module (12) is fixedly connected to the high-frequency pulse electromagnetic coil (13). The high-frequency pulse electromagnetic coil (13) is located outside the high-temperature slurry pipe (2).

6. The alumina pipeline leaching heat exchange device according to claim 4, characterized in that: The outer top of the arc-shaped fastener (10) is fixedly connected to a suspension block (14), and an adhesive groove (15) is provided in the middle of the outer side of the protective shell (9).

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