A high-efficiency evaporation and concentration device for caustic soda production

Abstract

This utility model discloses a high-efficiency evaporation and concentration device for caustic soda production, including a base, a heating mechanism fixed to the top of the base, an evaporation tank fixed inside the heating mechanism, the evaporation tank being used to evaporate the caustic soda solution, a fixing ring fixedly fitted onto the evaporation tank, a cover plate installed on the top of the evaporation tank, and a bolt installed on the top of the cover plate, the bolt penetrating the cover plate and connected to the fixing ring through threads. This utility model, through the coordinated design of the heating mechanism, stirring mechanism, and vacuum pump, effectively solves the problems of uneven heating, frequent scaling, and low evaporation efficiency in existing evaporation equipment. The circumferential array of heating rods and the annular heat-conducting sleeve of the heating mechanism ensure uniform heating of the evaporation tank, reducing crystallization and scaling; the multi-directional disturbance rods of the stirring mechanism disperse the solution concentration gradient in real time, enhancing heat transfer efficiency; the vacuum pump, in conjunction with the connecting pipe, creates a negative pressure environment, lowering the boiling point of the solution to accelerate evaporation.

Description

Technical Field

[0001] This utility model relates to the field of caustic soda production technology, and in particular to a high-efficiency evaporation and concentration device for caustic soda production. Background Technology

[0002] Caustic soda (sodium hydroxide, NaOH) is an important strong alkaline chemical raw material, widely used in papermaking, textile printing and dyeing, petrochemicals, water treatment and food processing. In its production process, evaporation and concentration is the key step to increase the concentration of caustic soda solution from low to the high concentration required by industry (such as above 99%). The efficiency and energy consumption of this step directly affect the production cost and product quality of caustic soda.

[0003] Existing evaporation equipment for caustic soda production mostly employs structures such as multi-effect evaporators, falling film evaporators, or forced circulation evaporators. These devices typically heat the caustic soda solution using heating tube bundles and utilize the negative pressure environment of the evaporation chamber to lower the solution's boiling point, causing water to escape as steam, thus concentrating the solution. Taking the common multi-effect evaporator as an example, it uses multiple evaporation units connected in series, utilizing the secondary steam generated in the previous effect as the heat source for the next effect, thereby improving thermal energy utilization to a certain extent.

[0004] However, existing evaporation equipment has significant shortcomings in practical applications: the traditional arrangement of heating tube bundles easily leads to uneven heating of the solution, especially when processing high-concentration caustic soda solutions. Local overheating areas are prone to solute crystallization and adhesion to the heating surface, forming scale, which not only reduces heat transfer efficiency but also requires frequent shutdowns for cleaning, affecting production continuity. To solve this problem, we propose a high-efficiency evaporation and concentration device for caustic soda production. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-efficiency evaporation and concentration device for caustic soda production.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A high-efficiency evaporation and concentration device for caustic soda production includes a base, a heating mechanism fixed to the top of the base, an evaporation tank fixed inside the heating mechanism, the evaporation tank being used to evaporate a caustic soda solution, a fixing ring fixedly fitted onto the evaporation tank, a cover plate installed on the top of the evaporation tank, a bolt installed on the top of the cover plate, the bolt penetrating the cover plate and connected to the fixing ring via threads, a stirring mechanism and a vacuum pump installed on the cover plate, and a connecting pipe installed on the vacuum pump;

[0008] The heating mechanism includes a housing fixed on a base, with support seats fixed to the inner bottom and inner top of the housing, a heating rod installed between the two support seats, and a heat-conducting sleeve fixed inside the support seats, the heat-conducting sleeve penetrating the top of the housing.

[0009] Preferably, the support base is a circular ring structure, and the number of heating rods is several, with the heating rods located between two support bases and distributed in a circumferential array.

[0010] Preferably, the heat-conducting sleeve is fitted onto the surface of the evaporator, and the heat-conducting sleeve is located between several heating rods.

[0011] Preferably, the number of bolts is several groups, and the several groups of bolts are located on the cover plate and distributed in a circumferential array. The bolts are used to lock the cover plate and the retaining ring.

[0012] Preferably, the stirring mechanism includes a motor mounted on the cover plate, the output shaft of the motor passing through the cover plate and connected to a connecting shaft, a disturbance frame fixed to the bottom of the connecting shaft, and a disturbance rod fixed to the inner wall of the disturbance frame.

[0013] Preferably, the number of disturbance rods is several, and the several disturbance rods are located on the inner walls on both sides of the disturbance frame and are symmetrically distributed.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] The heating mechanism of this utility model consists of several heating rods arranged in a circular array inside the shell, which, together with a heat-conducting sleeve fitted onto the surface of the evaporator, form a ring-shaped heating structure. This design allows the heat from the heating rods to be evenly conducted to the evaporator through the heat-conducting sleeve, avoiding the problem of caustic soda solution crystallization and scaling caused by local overheating in traditional heating tube bundles. At the same time, the symmetrical distribution of the heating rods and the annular heat-conducting characteristics of the heat-conducting sleeve can significantly improve heating uniformity, reduce heat transfer resistance, and make the caustic soda solution more evenly heated during the evaporation process, effectively improving heat transfer efficiency and extending the continuous operation time of the equipment.

[0016] The stirring mechanism is driven by a motor-driven connecting shaft on the cover plate, which rotates the bottom disturbance frame and symmetrically distributed disturbance rods. This creates multi-directional and multi-angle stirring and disturbance of the caustic soda solution in the evaporator. This structure can disperse the concentration gradient in the solution in real time, preventing excessive concentration in high-concentration areas due to prolonged residence time. At the same time, it promotes full contact between the solution and the heating surface, further improving evaporation efficiency. In addition, the shearing action of the disturbance rods on the solution during stirring can effectively prevent solute from depositing on the heating surface. Combined with the uniform heating design, it can significantly reduce the risk of scaling and ensure the stability of the evaporation process and the consistency of product quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a high-efficiency evaporation and concentration device for caustic soda production proposed in this utility model;

[0018] Figure 2 for Figure 1 Side sectional view;

[0019] Figure 3 for Figure 1 Installation diagram of the heating mechanism;

[0020] Figure 4 for Figure 3 A sectional view.

[0021] In the diagram: 1. Base, 2. Heating mechanism, 21. Shell, 22. Support base, 23. Heating rod, 24. Heat-conducting sleeve, 3. Evaporator, 4. Fixing ring, 5. Cover plate, 6. Bolt, 7. Stirring mechanism, 71. Motor, 72. Connecting shaft, 73. Disturbing frame, 74. Disturbing rod, 8. Air pump, 9. Connecting pipe. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Reference Figure 1-4 A high-efficiency evaporation and concentration device for caustic soda production includes a base 1, a heating mechanism 2 fixed on the top of the base 1, an evaporation tank 3 fixed inside the heating mechanism 2, the evaporation tank 3 being used to evaporate caustic soda solution, a fixing ring 4 fixedly fitted on the evaporation tank 3, a cover plate 5 installed on the top of the evaporation tank 3, and bolts 6 installed on the top of the cover plate 5, the bolts 6 penetrating the cover plate 5 and connected to the fixing ring 4 by threads, the number of bolts 6 being several groups, the several groups of bolts 6 being located on the cover plate 5 and distributed in a circumferential array, the bolts 6 being used to lock the cover plate 5 and the fixing ring 4, a stirring mechanism 7 and a vacuum pump 8 being installed on the cover plate 5, and a connecting pipe 9 being installed on the vacuum pump 8;

[0024] In this embodiment, refer to Figure 1 and Figure 2The heating mechanism 2 includes a housing 21 fixed on the base 1. The bottom and top of the housing 21 are both fixed with ring-shaped support seats 22. Several heating rods 23 are arranged in a circumferential array between the two support seats 22 to form a heating area around the evaporator 3. A heat-conducting sleeve 24 fixed inside the support seat 22 is fitted onto the surface of the evaporator 3 and passes through the top of the housing 21, and is located between the heating rods 23. Through the synergistic effect of the circumferential array of heating rods 23 and the ring-shaped heat-conducting sleeve 24, this structure can evenly conduct heat to the evaporator 3, avoid the problem of caustic soda solution crystallization and scaling caused by local overheating of traditional heating tube bundles, significantly improve heating uniformity and reduce heat transfer resistance, and effectively improve heat transfer efficiency.

[0025] In this embodiment, refer to Figure 1 , Figure 2 and Figure 4 The stirring mechanism 7 includes a motor 71 mounted on the cover plate 5, whose output shaft passes through the cover plate 5 and connects to a connecting shaft 72. Several disturbance rods 74 are symmetrically distributed on both sides of the inner wall of the disturbance frame 73 fixed at the bottom of the connecting shaft 72. When the motor 71 drives the connecting shaft 72 to rotate, the disturbance frame 73 and the disturbance rods 74 form multi-directional stirring disturbance, which can disperse the concentration gradient in the solution in real time and avoid excessive concentration in high concentration areas due to excessive residence time. At the same time, the shearing action of the disturbance rods 74 on the solution promotes full contact between the solution and the heating surface of the evaporator 3, further improving the evaporation efficiency. This structure can also effectively prevent solute from depositing on the heating surface, and the uniform heating design reduces the risk of scaling and ensures the stability of the evaporation process.

[0026] The base serves as the fundamental support structure of the device, bearing the entire weight of the heating mechanism (2) and the evaporator (3), ensuring stable operation of the device. When the heating mechanism is working, the heating rods (23) inside the shell (21) are energized to generate heat. Several heating rods (23) are arranged in a circular array between the two support seats (22), forming a heating area surrounding the evaporator (3). The heat-conducting sleeve (24) is fitted onto the surface of the evaporator (3) and extends through the top of the shell (21). Its annular structure can evenly conduct the heat from the heating rods (23) to the periphery of the evaporator (3), ensuring that the caustic soda solution inside the tank is heated evenly from all directions, avoiding crystallization and scaling problems caused by localized overheating. The evaporator is used to contain the caustic soda solution. When (4) is fixed... After the ring is locked to the cover plate by several sets of 6 bolts arranged in a circular array, a sealed space is formed inside the tank. When the stirring mechanism 7 on the top of the cover plate 5 is activated, the motor 71 drives the connecting shaft 72 to rotate, which in turn drives the disturbance frame 73 at the bottom and the symmetrically distributed disturbance rods 74 to rotate synchronously, generating multi-directional shear force on the solution, dispersing the solution concentration gradient in real time, preventing excessive concentration in high-concentration areas, and strengthening the contact between the solution and the heating surface of the evaporator 3, improving heat transfer efficiency. The vacuum pump is connected to the inside of the evaporator 3 through the connecting pipe 9, continuously extracting the water vapor generated by evaporation, forming a negative pressure environment inside the tank, lowering the boiling point of the caustic soda solution, and accelerating water evaporation. During the evaporation process, the synergistic heating of the heat-conducting jacket 24 and the heating rod 23, the stirring disturbance of the disturbance rod 74, and the negative pressure evaporation work together to ensure that the solution is heated evenly while maintaining dynamic flow, effectively inhibiting the deposition of solute on the heating surface, ensuring the continuous and stable evaporation and concentration process, and ultimately achieving efficient concentration of the caustic soda solution to the industrial required concentration.

[0027] In summary, this invention effectively solves the problems of uneven heating, frequent scaling, and low evaporation efficiency in existing evaporation equipment through the coordinated design of the heating mechanism, stirring mechanism, and vacuum pump. The circumferential array of heating rods and the annular heat-conducting sleeve of the heating mechanism ensure uniform heating of the evaporation tank and reduce crystallization and scaling. The multi-directional disturbance rod of the stirring mechanism disperses the solution concentration gradient in real time, enhancing heat transfer efficiency. The vacuum pump, together with the connecting pipe, creates a negative pressure environment, lowering the boiling point of the solution to accelerate evaporation.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A high-efficiency evaporation concentration device for caustic soda production, comprising a base (1), characterized in that, A heating mechanism (2) is fixed on the top of the base (1), and an evaporator (3) is fixed inside the heating mechanism (2). The evaporator (3) is used to evaporate the caustic soda solution. A fixing ring (4) is fixedly sleeved on the evaporator (3). A cover plate (5) is installed on the top of the evaporator (3). A bolt (6) is installed on the top of the cover plate (5). The bolt (6) passes through the cover plate (5) and is connected to the fixing ring (4) by threads. A stirring mechanism (7) and a vacuum pump (8) are installed on the cover plate (5). A connecting pipe (9) is installed on the vacuum pump (8). The heating mechanism (2) includes a housing (21) fixed on a base (1). Support seats (22) are fixed to the inner bottom and inner top of the housing (21). A heating rod (23) is installed between the two support seats (22). A heat-conducting sleeve (24) is fixed inside the support seat (22). The heat-conducting sleeve (24) penetrates the top of the housing (21).

2. The high-efficiency evaporation concentration device for caustic soda production according to claim 1, characterized in that, The support base (22) is a ring structure, and there are several heating rods (23). The heating rods (23) are located between two support bases (22) and are distributed in a circumferential array.

3. The high-efficiency evaporation concentration device for caustic soda production according to claim 1, characterized in that, The heat-conducting sleeve (24) is fitted onto the surface of the evaporator (3), and the heat-conducting sleeve (24) is located between several heating rods (23).

4. The high-efficiency evaporation concentration device for caustic soda production according to claim 1, characterized in that, The number of bolts (6) is several groups, and the several groups of bolts (6) are located on the cover plate (5) and are distributed in a circumferential array. The bolts (6) are used to lock the cover plate (5) and the fixing ring (4).

5. The high-efficiency evaporation concentration device for caustic soda production according to claim 1, characterized in that, The stirring mechanism (7) includes a motor (71) mounted on the cover plate (5). The output shaft of the motor (71) passes through the cover plate (5) and is connected to a connecting shaft (72). A disturbance frame (73) is fixed at the bottom of the connecting shaft (72), and a disturbance rod (74) is fixed on the inner wall of the disturbance frame (73).

6. The high-efficiency evaporation concentration device for caustic soda production according to claim 5, characterized in that, The number of disturbance rods (74) is several, and the several disturbance rods (74) are located on the inner walls on both sides of the disturbance frame (73) and are symmetrically distributed.

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