A cooling energy-saving device in sodium aluminate solution

Abstract

The utility model relates to heat exchanger technical field, and disclose a kind of cooling energy-saving device in sodium aluminate solution, the cooling energy-saving device in sodium aluminate solution, including frame, the lateral wall of frame is fixedly connected with reaction kettle, the top end surface of reaction kettle is fixedly connected with feed pipe, the bottom of reaction kettle is fixedly connected with valve body, the bottom end of valve body is fixedly connected with solution liquid inlet pipe, the lateral wall of solution liquid inlet pipe is fixedly connected with pump body, the lateral wall of frame is provided with heat exchange component, the heat exchange component includes shell, the lateral wall of shell is fixedly connected with mother liquor liquid inlet pipe.The cooling energy-saving device in sodium aluminate solution, sodium aluminate solution produces turbulence and deceleration in Tesla valve, improve heat exchange efficiency, high-temperature sodium aluminate solution flows from top to bottom along heat exchange pipe, while cold fluid flows from bottom to top in shell, realize counterflow heat exchange, temperature difference distribution is more uniform.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, specifically to a cooling and energy-saving device for sodium aluminate solution. Background Technology

[0002] In the alumina production process, the sodium aluminate solution is at a high temperature after the leaching process, usually above 100°C. In order to meet the temperature requirements of the decomposition process, which is about 60–70°C, a special cooling and energy-saving device is needed to cool the solution. This device not only reduces the solution temperature, but also recovers waste heat for heating the feed water or other process steps, thereby achieving energy saving, improving thermal efficiency and stabilizing process conditions.

[0003] In alumina production, existing heat exchange devices used for cooling sodium aluminate solutions generally employ plate heat exchangers, which consist of a series of corrugated stainless steel or corrosion-resistant alloy plates stacked together. An independent flow channel is formed between each pair of plates, allowing high-temperature sodium aluminate solution and cooling water or low-temperature diluent to flow alternately in adjacent channels, thereby achieving heat transfer from the high-temperature liquid to the low-temperature liquid.

[0004] However, in actual use, the sodium aluminate solution in the above-mentioned plate heat exchanger may experience a rapid or localized overcooling, exceeding the solubility limit. This causes sodium aluminate to precipitate and crystallize, which accumulates over time to form a thick layer, leading to a decrease in heat exchange efficiency and unstable liquid outlet temperature. In view of this, we propose a cooling and energy-saving device for sodium aluminate solution. Summary of the Invention

[0005] The purpose of this invention is to provide a cooling and energy-saving device for sodium aluminate solution to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cooling and energy-saving device for sodium aluminate solution, comprising a frame, a reaction vessel fixedly connected to the side wall of the frame, a feed pipe fixedly connected to the top end face of the reaction vessel, a valve body fixedly connected to the bottom of the reaction vessel, a solution inlet pipe fixedly connected to the bottom end of the valve body, a pump body fixedly connected to the side wall of the solution inlet pipe, a heat exchange assembly provided on the side wall of the frame, the heat exchange assembly comprising a shell, a mother liquor inlet pipe fixedly connected to the side wall of the shell, and a mother liquor outlet pipe fixedly connected to the side wall of the shell.

[0007] Preferably, a sleeve is fixedly connected to the top of the housing, a limit bracket is fixedly connected to the side wall of the housing, a sealing plate is provided at the bottom of the housing, the sealing plate is fixedly connected to a sleeve, the sleeve is inserted into the heat exchange tube, and a Tesla valve is provided on the inner wall of the heat exchange tube.

[0008] Preferably, the heat exchange tubes are provided in two sets, and the two sets of heat exchange tubes are combined into a complete pipe. The heat exchange tubes are inserted into the sleeve, and the Tesla valve can be cleaned by opening the heat exchange tubes.

[0009] Preferably, the sealing plate is fitted to the housing, and a plug is fixedly connected to the side wall of the sealing plate. The plug is inserted into the limiting frame, and the plug is sleeved with a bolt. The bolt is threaded to the housing. The housing and the sealing plate are fixed by the bolt to prevent leakage of the mother liquor.

[0010] Preferably, the sleeve is fixedly connected to the solution inlet pipe, and a guide rail is fixedly connected to the inner wall of the shell.

[0011] Preferably, a motor is fixedly connected to the outer wall of the housing, the output shaft of the motor is fixedly connected to a gear, a gear ring is provided on the inner wall of the housing, the gear ring is fixedly connected to a spoiler, the gear ring meshes with the gear, and the gear ring is slidably connected to a guide rail.

[0012] Preferably, the number of the baffles is provided in several groups, and the several groups of baffles are arranged in a spiral shape at equal intervals inside the shell. The baffles stir the mother liquor and promote the full mixing of heat.

[0013] Compared with the prior art, this utility model provides a cooling and energy-saving device for sodium aluminate solution, which has the following beneficial effects: 1. The cooling and energy-saving device in this sodium aluminate solution, through the heat exchange components, generates turbulence and deceleration in the sodium aluminate solution within the Tesla valve, resulting in more uniform flow and enhanced turbulence, thereby improving heat exchange efficiency. The high-temperature sodium aluminate solution flows downward along the heat exchange tube, while the cold fluid flows upward within the shell, achieving counter-current heat exchange. This results in a more uniform temperature difference distribution, avoiding localized overcooling or overheating. The heat exchange tube can be cleaned by removing the sealing plate and pulling out the heat exchange tube, preventing crystallization and blockage of the Tesla valve and pipes, and ensuring long-term stable operation.

[0014] 2. The cooling and energy-saving device in the sodium aluminate solution uses a baffle plate to continuously rotate, tumble, and mix the mother liquor, reducing laminar flow and making the flow more uniform. During the stirring process, the liquid temperature is evenly distributed, enhancing the heat exchange between the heat exchange tube and the mother liquor and reducing the temperature gradient. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of the shell of this utility model; Figure 3 This utility model Figure 2 Schematic diagram of the structure of region A in the middle; Figure 4 This is a schematic diagram of the spoiler structure of this utility model; Figure 5 This is an exploded view of the heat exchanger tube of this utility model.

[0016] In the diagram: 1. Frame; 2. Reactor; 3. Feed pipe; 4. Valve body; 5. Solution inlet pipe; 6. Pump body; 7. Heat exchange assembly; 701. Shell; 702. Mother liquor inlet pipe; 703. Mother liquor outlet pipe; 704. Sleeve 1; 705. Sealing plate; 706. Heat exchange tube; 707. Tesla valve; 708. Sleeve 2; 709. Insert block; 710. Limiting frame; 8. Motor; 9. Gear; 10. Gear ring; 11. Baffle plate. Detailed Implementation

[0017] like Figures 1-5 As shown, this utility model provides a technical solution: a cooling and energy-saving device for sodium aluminate solution, including a frame 1, a reaction vessel 2 fixedly connected to the side wall of the frame 1, a feed pipe 3 fixedly connected to the top end face of the reaction vessel 2, a valve body 4 fixedly connected to the bottom of the reaction vessel 2, a solution inlet pipe 5 fixedly connected to the bottom end of the valve body 4, a pump body 6 fixedly connected to the side wall of the solution inlet pipe 5, a heat exchange assembly 7 provided on the side wall of the frame 1, the heat exchange assembly 7 including a shell 701, a mother liquor inlet pipe 702 fixedly connected to the side wall of the shell 701, and a mother liquor outlet pipe 703 fixedly connected to the side wall of the shell 701.

[0018] In one embodiment of this utility model, a sleeve 704 is fixedly connected to the top of the housing 701, the sleeve 704 is fixedly connected to the solution inlet pipe 5, a limit bracket 710 is fixedly connected to the side wall of the housing 701, a sealing plate 705 is provided at the bottom of the housing 701, the sealing plate 705 is fixedly connected to the sleeve 708, the sleeve 704 is inserted into the heat exchange tube 706, and a Tesla valve 707 is provided on the inner wall of the heat exchange tube 706.

[0019] There are two sets of heat exchange tubes 706. The two sets of heat exchange tubes 706 are combined into a complete pipe. The heat exchange tubes 706 are inserted into the sleeve 708. The Tesla valve 707 can be cleaned by opening the heat exchange tubes 706.

[0020] The sealing plate 705 is attached to the housing 701. The side wall of the sealing plate 705 is fixedly connected to the insert block 709. The insert block 709 is inserted into the limit frame 710. The insert block 709 is sleeved with the bolt. The bolt is threaded to the housing 701. The housing 701 and the sealing plate 705 are fixed by the bolt to prevent the leakage of the mother liquor.

[0021] High-temperature sodium aluminate enters the pump body 6 through the solution inlet pipe 5, and then enters the heat exchange tube 706 through the sleeve 704. The heat exchange tube 706 is equipped with a Tesla valve 707. The sodium aluminate solution is subjected to turbulence and deceleration in the valve, which makes the fluid uniform and enhances the turbulence, thereby improving the heat exchange efficiency. The high-temperature sodium aluminate solution in the heat exchange tube 706 flows from top to bottom along the heat exchange tube 706, while the cold fluid flows from bottom to top in the shell 701, realizing counter-current heat exchange. This counter-current design makes the temperature difference distribution more uniform, improves the heat exchange efficiency, and reduces the problem of local overcooling or overheating.

[0022] During the countercurrent heat exchange process between the high-temperature sodium aluminate solution and the mother liquor, heat is transferred to the mother liquor to meet the temperature required for subsequent decomposition, thereby achieving heat recovery and reducing the overall energy consumption of the process.

[0023] The heat exchange tube 706 can be inserted into the sleeve 708. By removing the sealing plate 705 and pulling out the heat exchange tube 706, the Tesla valve 707 and the inside of the tube can be cleaned to prevent crystallization or blockage and ensure long-term stable operation.

[0024] The sealing plate 705 fits tightly against the shell 701, and the insert block 709 is fixed to the limiting bracket 710 by bolts to ensure that the mother liquor will not leak during the heat exchange process and to ensure operational safety.

[0025] In addition, a motor 8 is fixedly connected to the outer wall of the housing 701, and the output shaft of the motor 8 is fixedly connected to the gear 9. A gear ring 10 is provided on the inner wall of the housing 701, and the gear ring 10 is fixedly connected to the baffle 11. The gear ring 10 meshes with the gear 9. A guide rail is fixedly connected to the inner wall of the housing 701, and the gear ring 10 is slidably connected to the guide rail. Several sets of baffles 11 are provided, and the several sets of baffles 11 are arranged in a spiral shape at equal intervals inside the housing 701. The baffles 11 stir the mother liquor and promote the full mixing of heat. The motor 8 drives the gear 9 to rotate through the output shaft. Through the meshing of the gear 9 with the housing 701, the baffles 11 are driven to rotate inside the housing 701. The mother liquor is continuously rotated, turned and mixed under the action of the baffles 11, reducing the laminar flow phenomenon of the liquid and making the flow more uniform. During the stirring process, the liquid temperature is evenly distributed, enhancing the heat exchange between the heat exchange tube 706 and the mother liquor and reducing the temperature gradient.

[0026] In this invention, during use, a high-temperature sodium aluminate solution enters the pump body 6 through the solution inlet pipe 5 and then enters the heat exchange tube 706 through the sleeve 704. A Tesla valve 707 is installed inside the heat exchange tube 706, causing turbulence and deceleration of the sodium aluminate solution within the valve, resulting in more uniform flow and enhanced turbulence, thereby improving heat exchange efficiency. The high-temperature sodium aluminate solution flows downwards along the heat exchange tube 706, while the cold fluid flows upwards within the shell 701, achieving counter-current heat exchange. This results in a more uniform temperature distribution, avoiding localized overcooling or overheating. Heat is transferred to the cold fluid through heat exchange, achieving heat recovery, reducing overall process energy consumption, and ensuring the mother liquor temperature meets the requirements of subsequent decomposition processes. The heat exchange tube 706 can be cleaned by removing the sealing plate 705 and pulling out the heat exchange tube 706 to prevent crystallization and blockage of the Tesla valve 707 and pipes, ensuring long-term stable operation. The sealing plate 705 is tightly fitted to the shell 701, and the insert block 709 and bolt-fixed limit bracket 710 ensure no leakage of the mother liquor and guarantee operational safety.

[0027] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A cooling and energy-saving device for sodium aluminate solution, comprising a frame (1), a reaction vessel (2) fixedly connected to the side wall of the frame (1), a feed pipe (3) fixedly connected to the top end face of the reaction vessel (2), a valve body (4) fixedly connected to the bottom of the reaction vessel (2), a solution inlet pipe (5) fixedly connected to the bottom end of the valve body (4), and a pump body (6) fixedly connected to the side wall of the solution inlet pipe (5), characterized in that: The side wall of the frame (1) is provided with a heat exchange assembly (7), the heat exchange assembly (7) includes a shell (701), the side wall of the shell (701) is fixedly connected with a mother liquor inlet pipe (702), and the side wall of the shell (701) is fixedly connected with a mother liquor outlet pipe (703).

2. The cooling and energy-saving device for sodium aluminate solution according to claim 1, characterized in that: The top of the housing (701) is fixedly connected to a sleeve (704), the side wall of the housing (701) is fixedly connected to a limit bracket (710), the bottom of the housing (701) is provided with a sealing plate (705), the sealing plate (705) is fixedly connected to a sleeve (708), the sleeve (704) is inserted into a heat exchange tube (706), and a Tesla valve (707) is provided on the inner wall of the heat exchange tube (706).

3. The cooling and energy-saving device for sodium aluminate solution according to claim 2, characterized in that: The heat exchange tubes (706) are provided in two sets, and the two sets of heat exchange tubes (706) are combined into a complete pipe. The heat exchange tubes (706) are inserted into the sleeve (708).

4. The cooling and energy-saving device for sodium aluminate solution according to claim 2, characterized in that: The sealing plate (705) is attached to the housing (701). A plug (709) is fixedly connected to the side wall of the sealing plate (705). The plug (709) is inserted into the limiting frame (710). The plug (709) is sleeved with a bolt. The bolt is threadedly connected to the housing (701).

5. The cooling and energy-saving device for sodium aluminate solution according to claim 2, characterized in that: The sleeve (704) is fixedly connected to the solution inlet pipe (5), and the inner wall of the housing (701) is fixedly connected to a guide rail.

6. The cooling and energy-saving device for sodium aluminate solution according to claim 5, characterized in that: A motor (8) is fixedly connected to the outer wall of the housing (701). The output shaft of the motor (8) is fixedly connected to a gear (9). A gear ring (10) is provided on the inner wall of the housing (701). The gear ring (10) is fixedly connected to a spoiler (11). The gear ring (10) meshes with the gear (9). The gear ring (10) is slidably connected to a guide rail.

7. The cooling and energy-saving device for sodium aluminate solution according to claim 6, characterized in that: The number of the spoilers (11) is set in several groups, and the several groups of spoilers (11) are arranged in a spiral shape at equal intervals inside the housing (701).

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