Caustic soda concentration equipment for chlor-alkali production

Abstract

The utility model belongs to the technical field of chlor-alkali industry, and particularly discloses caustic soda concentration equipment for chlor-alkali production, which comprises an outer tank body, a rack is fixedly mounted at the bottom of the outer tank body, a motor is fixedly mounted at the top of the outer tank body, a rotating shaft is fixedly connected to the output end of the motor, an inner tank body is fixedly connected in the outer tank body, and the rotating shaft is fixedly connected to the inner tank body. A heating module is arranged at the bottom of the inner tank body, an inlet is formed in the outer tank body, the blocking heat preservation part effectively reduces rapid loss of water vapor through the unique structural design of the blocking heat preservation part, and the multiple layers of partition plates are tightly, stably and fixedly connected between the outer tank body and the inner tank body. The space in the outer tank body is finely divided layer by layer through the partition plates, limited gas exchange is carried out on the upper space and the lower space of the outer tank body and the space between every two layers of partition plates only through the elaborately-designed exchange holes, rapid flowing of water vapor in the outer tank body is greatly hindered through the design, and therefore rapid loss of the water vapor is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to chlor alkali industrial technical field, concretely relates to a caustic soda concentration equipment for chlor alkali production. BACKGROUND

[0002] In industry, NaOH, Cl2 and H2 are prepared by the method of electrolyzing saturated NaCl solution, and a series of chemical products are produced by taking them as raw materials, which is called chlor alkali industry, caustic soda is sodium hydroxide, and needs to be heated and evaporated by sodium hydroxide solution, in the prior art, rotary drum type concentration device is used, and falling film evaporator is also used.

[0003] Through the search, the patent CN211411017U proposes a caustic soda concentration equipment for chlor alkali production, the concentration equipment further includes a reflux device arranged outside the shell, the reflux device includes a main pipeline in communication with the inner cylinder, and the main pipeline passes through the top of the top cover and leads to the outside, the tail end of the main pipeline is divided into a first branch pipe and a second branch pipe, the first branch pipe is in communication with the cavity, and the second branch pipe is provided with an electromagnetic valve and an alarm; the concentration equipment further includes a steam pressure sensor arranged in the cavity, and the signal output end of the steam pressure sensor is electrically connected to the electromagnetic valve and the alarm through the controller, the steam generated in the concentration process is introduced into the cavity, so that the heat is utilized twice, and the steam in the cavity is more uniform, and the heating of caustic soda is more uniform; when the steam pressure in the cavity is too large, the steam pressure sensor can alarm in time and discharge, so as to avoid the danger caused by the too large steam pressure in the cavity.

[0004] Although the above prior art introduces the steam generated in the concentration process into the cavity, so that the heat is utilized twice, and the steam in the cavity is more uniform, and the heating of caustic soda is more uniform; when the steam pressure in the cavity is too large, the steam pressure sensor can alarm in time and discharge, so as to avoid the danger caused by the too large steam pressure in the cavity, but the above prior art has found that there is a certain limitation in the steam discharge mechanism in actual use, only when the air pressure in the cavity rises to a certain degree, the steam can be allowed to be released, and this setting leads to that once the electromagnetic valve is opened, the steam in the cavity will be discharged at a very fast speed, and in this rapid exhaust process, a large amount of heat will be taken out of the cavity with the steam in a short time, and then the temperature in the cavity will drop sharply, this large fluctuation of temperature not only affects the stability of the caustic soda heating process, but also may have negative effects on the continuity of the whole production process and the product quality, such as reducing the production efficiency of caustic soda and fluctuating the product quality, and a new technical scheme is urgently needed to solve these problems. UTILITY MODEL CONTENTS

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a caustic soda concentration device for chlor-alkali production.

[0006] To achieve the above objectives, this utility model provides a caustic soda concentration device for chlor-alkali production, including an outer tank, a frame fixedly installed at the bottom of the outer tank, a motor fixedly installed at the top of the outer tank, a rotating shaft fixedly connected to the output end of the motor, an inner tank fixedly connected inside the outer tank, a heating module provided at the bottom of the inner tank, an inlet provided on the outer tank, a water inlet provided on one side of the outer tank's outer wall, a drain pipe provided at the bottom of the outer tank, a heat-insulating part provided inside the outer tank, and a steam utilization component provided inside the outer tank.

[0007] The heat-insulating part is used to prevent water vapor from escaping rapidly and to maintain the temperature inside the outer tank.

[0008] The steam utilization component is used to introduce steam from the inner tank to the outer tank and to discharge steam from the outer tank when the steam in the outer tank exceeds a threshold. The steam utilization component includes a gas conveying mechanism and a discharge mechanism.

[0009] In the above technical solution, the heat-insulating part further includes several partitions fixedly connected between the outer tank and the inner tank, and the partitions are provided with symmetrically distributed communication holes.

[0010] In the above technical solution, a uniformly distributed heat-conducting plate is fixedly connected between the two AC holes.

[0011] In the above technical solution, a through hole is further provided on the heat-conducting plate, and a connecting mesh is fixedly connected inside the through hole.

[0012] In the above technical solution, the gas transmission mechanism further includes a connecting pipe inserted and fixedly connected to the outer tank, and one end of the connecting pipe is fixedly connected to and inserted into the inner tank, and a one-way valve is provided on the connecting pipe.

[0013] In the above technical solution, the discharge mechanism further includes a second exhaust pipe inserted and fixedly connected to one side of the bottom of the outer tank. A steam pressure sensor is installed on the second exhaust pipe, and a solenoid valve is also installed on the second exhaust pipe. The steam pressure sensor and the solenoid valve are electrically connected.

[0014] In the above technical solution, the discharge mechanism and the gas transmission mechanism are arranged diagonally, one above the other.

[0015] In the above technical solution, a reversing valve is further provided on the second exhaust pipe, and a first exhaust pipe is inserted and fixedly connected inside the reversing valve, and a fan is connected to the end of the first exhaust pipe.

[0016] In the above technical solution, a third exhaust pipe is inserted and fixedly connected inside the reversing valve, and the third exhaust pipe is connected to an external pipeline.

[0017] In the above technical solution, evenly distributed stirring blades are fixedly connected to the outer wall of the rotating shaft.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] By setting up a heat-insulating barrier, a relatively stable high-temperature environment can be maintained around the inner tank. This not only helps the caustic soda concentration process proceed smoothly and improves the concentration efficiency, but also reduces energy waste and product quality instability caused by temperature fluctuations. The stable heat supply makes the caustic soda solution in the inner tank heat up more evenly.

[0020] The diagonal arrangement at the top and bottom makes the steam flow path within the equipment more reasonable, which helps the steam to be evenly distributed throughout the equipment and to fully exchange heat. At the same time, this layout is also conducive to the overall structural stability of the equipment, reducing equipment malfunctions caused by uneven local pressure or poor steam flow. Through the efficient operation of the steam utilization components, not only is the rational recycling of steam achieved, improving energy utilization efficiency and reducing production costs, but also the safety and stability of the production process are guaranteed.

[0021] A first exhaust pipe is inserted and fixedly connected inside the reversing valve, with a high-efficiency fan connected to its end. When the temperature inside the outer tank needs to be reduced quickly during equipment operation, the fan starts. With its powerful suction capacity, it can form a strong negative pressure in a short time. Through the connection between the first exhaust pipe and the reversing valve, the hot steam inside the outer tank is quickly extracted, achieving the purpose of quickly removing heat from the outer tank. This provides a flexible temperature control method and diversified steam discharge paths for the production process. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a caustic soda concentration device for chlor-alkali production proposed in this utility model;

[0023] Figure 2 This is a schematic diagram of the outer tank structure of a caustic soda concentration device for chlor-alkali production proposed in this utility model;

[0024] Figure 3 This is a schematic diagram of the internal structure of the outer tank of a caustic soda concentration device for chlor-alkali production proposed in this utility model.

[0025] In the diagram: 1. Frame; 2. Outer tank; 3. Inlet; 4. Motor; 5. Water inlet; 6. Steam pressure sensor; 7. Solenoid valve; 8. Reversing valve; 9. First exhaust pipe; 10. Second exhaust pipe; 11. Third exhaust pipe; 12. Drain pipe; 13. Connecting pipe; 14. Check valve; 15. Stirring blade; 16. Baffle plate; 17. Exchange port; 18. Heat-conducting plate; 19. Connecting mesh cover; 20. Heating module; 21. Inner tank; 22. Rotating shaft. Detailed Implementation

[0026] To better understand the above-mentioned objectives, features and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0027] like Figures 1-3 The caustic soda concentration equipment for chlor-alkali production shown includes an outer tank 2, a frame 1 fixedly installed at the bottom of the outer tank 2, a motor 4 fixedly installed at the top of the outer tank 2, a rotating shaft 22 fixedly connected to the output end of the motor 4, and uniformly distributed stirring blades 15 fixedly connected to the outer wall of the rotating shaft 22. An inner tank 21 is fixedly connected inside the outer tank 2, a heating module 20 is provided at the bottom of the inner tank 21, an inlet 3 is provided on the outer tank 2, a water inlet 5 is provided on one side of the outer wall of the outer tank 2, and a drain is provided at the bottom of the outer tank 2. The water pipe 12 has a heat-insulating part inside the outer tank 2 and a steam utilization component inside the outer tank 2. The heat-insulating part is used to prevent water vapor from escaping quickly and to maintain the temperature inside the outer tank 2. The heat-insulating part includes several partitions 16 fixedly connected between the outer tank 2 and the inner tank 21. The partitions 16 have symmetrically distributed exchange holes 17. A uniformly distributed heat-conducting plate 18 is fixedly connected between two exchange holes 17. The heat-conducting plate 18 has a through hole. A connecting mesh cover 19 is fixedly connected inside the through hole.

[0028] When motor 4 starts running, it provides stable power to the rotating shaft 22. The stirring blade 15 rotates synchronously under the drive of motor 4. The caustic soda solution inside the tank is thoroughly and evenly mixed under the strong stirring action of the stirring blade 15, effectively avoiding concentration differences caused by insufficient mixing in certain areas. This allows the heat generated by the heating module 20 at the bottom of the inner tank 21 to be evenly and quickly transferred to the entire solution system with the assistance of the stirring blade 15. The motor 4, fixedly installed on the top of the outer tank 2, is positioned to facilitate installation, debugging, and routine maintenance. At the same time, operators can easily approach and operate the equipment. The placement of the inlet 3 on the outer tank 2, the water inlet 5 on one side of the outer wall, and the drain pipe 12 at the bottom has been carefully considered, fully taking into account the actual production operation process and habits. Operators can easily add the required raw materials through the inlet 3 and add an appropriate amount of water through the water inlet 5. After the caustic soda concentration is completed, the water in the outer tank 2 can be quickly and smoothly drained through the drain pipe 12 at the bottom. The multi-layer baffles 16 are tightly and firmly fixed between the outer tank 2 and the inner tank 21. These baffles 16 6. The space inside the outer tank 2 is meticulously divided into layers. The upper and lower spaces of the outer tank 2, as well as the spaces between the partitions 16, allow limited gas exchange only through carefully designed exchange holes 17. This design greatly hinders the rapid flow of water vapor inside the outer tank 2, thus effectively reducing the rapid loss of water vapor. Furthermore, heat-conducting plates 18 are installed between the partitions 16. These heat-conducting plates 18 not only provide a secondary barrier to the flow of water vapor inside the outer tank 2, but their material and structural design also allow them to efficiently absorb the heat transferred from the water vapor while blocking it. The structure optimizes the heat conduction path, allowing the heat carried by water vapor to be fully trapped inside the outer tank 2, preventing the heat from escaping rapidly with the water vapor. This ensures that the heat inside the outer tank 2 can be stably and continuously supplied to the inner tank 21. Through the carefully designed heat-insulating part, a relatively stable high-temperature environment can be maintained around the inner tank 21. This not only helps the caustic soda concentration process proceed smoothly and improves the concentration efficiency, but also reduces energy waste and product quality instability caused by temperature fluctuations. The stable heat supply makes the caustic soda solution inside the inner tank 21 heat up more evenly. Example

[0029] like Figures 1-3As shown, the steam utilization component is used to introduce steam from the inner tank 21 into the outer tank 2, and to discharge the steam in the outer tank 2 when the steam in the outer tank 2 exceeds a threshold. The steam utilization component includes a gas supply mechanism and a discharge mechanism. The gas supply mechanism includes a connecting pipe 13 inserted and fixedly connected to the outer tank 2, and one end of the connecting pipe 13 is fixedly connected to and inserted into the inner tank 21. A one-way valve 14 is provided on the connecting pipe 13. The discharge mechanism includes a second exhaust pipe 10 inserted and fixedly connected to one side of the bottom of the outer tank 2. A steam pressure sensor 6 is provided on the second exhaust pipe 10, and a solenoid valve 7 is also provided on the second exhaust pipe 10. The steam pressure sensor 6 and the solenoid valve 7 are electrically connected. The discharge mechanism and the gas supply mechanism are arranged diagonally from top to bottom.

[0030] As a key component of the steam utilization assembly, the gas transmission mechanism's core component, the connecting pipe 13, is inserted and securely fixed to the outer tank 2. One end of the connecting pipe 13 is precisely fixed and inserted into the inner tank 21, ensuring an unobstructed transmission path for steam from the inner tank 21 to the outer tank 2. The one-way valve 14 installed on the connecting pipe 13 only allows steam to flow from the inner tank 21 to the outer tank 2, effectively preventing backflow and ensuring the unidirectional and stable flow of steam. This design allows the inner tank to... The steam generated inside the body 21 can be guided to the outer tank 2 in an orderly manner. The discharge mechanism discharges excess steam through the second exhaust pipe 10. The steam pressure sensor 6 installed on the second exhaust pipe 10 can monitor the steam pressure inside the outer tank 2 in real time and accurately. When the steam pressure sensor 6 detects that the steam pressure inside the outer tank 2 exceeds the preset threshold, it will immediately transmit the signal to the solenoid valve 7 electrically connected to it. After receiving the signal, the solenoid valve 7 will respond quickly, open the valve, and discharge the excess steam from the outer tank 2 in a timely manner. Example

[0031] like Figure 1 As shown, a reversing valve 8 is provided on the second exhaust pipe 10. A first exhaust pipe 9 is inserted into and fixedly connected to the reversing valve 8, and a fan is connected to the end of the first exhaust pipe 9. A third exhaust pipe 11 is inserted into and fixedly connected to the reversing valve 8, and the third exhaust pipe 11 is connected to an external pipeline.

[0032] A first exhaust pipe 9 is inserted and fixedly connected inside the reversing valve 8, with a high-efficiency fan connected to its end. When the temperature inside the outer tank 2 needs to be quickly reduced during equipment operation, the fan starts. With its powerful suction capacity, it can form a strong negative pressure in a short time. Through the connection between the first exhaust pipe 9 and the reversing valve 8, the hot steam inside the outer tank 2 is quickly extracted, achieving the purpose of quickly removing the heat inside the outer tank 2. This provides a flexible temperature control method and diversified steam discharge paths for the production process. When the steam pressure and temperature inside the outer tank 2 are within the normal range, the reversing valve 8 can guide the steam to the third exhaust pipe 11, connecting it to the external pipeline for regular steam discharge. At the same time, if the external pipeline is connected to a steam recovery and utilization device, the steam can be further recovered for waste heat, converting the heat energy in the steam into other usable energy forms, such as preheating raw materials or heating media required in other production processes, thereby improving the comprehensive energy utilization efficiency and reducing the production cost of the enterprise.

[0033] Working principle:

[0034] The heat-insulating section effectively reduces the rapid loss of water vapor through its unique structural design. The multi-layered baffles 16 are tightly and firmly fixed between the outer tank 2 and the inner tank 21. These baffles 16 meticulously divide the space inside the outer tank 2. The upper and lower spaces of the outer tank 2 and the spaces between each layer of baffles 16 allow limited gas exchange only through carefully designed exchange holes 17. This design greatly hinders the rapid flow of water vapor inside the outer tank 2, thereby effectively reducing the rapid loss of water vapor. A heat-conducting plate 18 is further set between the baffles 16. The heat-conducting plate 18 not only plays a secondary role in blocking the flow of water vapor inside the outer tank 2, but its own material and structural design also enable it to efficiently absorb the heat transferred by the water vapor while blocking the water vapor, optimizing the heat conduction path. This structure allows the heat carried by the water vapor to be fully trapped inside the outer tank 2, preventing the heat from escaping with the water vapor and ensuring that the heat inside the outer tank 2 can be stably and continuously supplied to the inner tank 21.

[0035] As a key component of the steam utilization assembly, the gas transmission mechanism's core component, the connecting pipe 13, is inserted and securely fixed to the outer tank 2. One end of the connecting pipe 13 is precisely fixed and inserted into the inner tank 21, ensuring an unobstructed transmission path for steam from the inner tank 21 to the outer tank 2. The one-way valve 14 installed on the connecting pipe 13 only allows steam to flow from the inner tank 21 to the outer tank 2, effectively preventing backflow and ensuring the unidirectional and stable flow of steam. This design allows the steam generated in the inner tank 21 to be guided orderly into the outer tank 2 during the caustic soda concentration process. The discharge mechanism discharges excess steam through the second exhaust pipe 10. The steam pressure sensor 6 installed on the second exhaust pipe 10 can monitor the steam pressure inside the outer tank 2 in real time and accurately. When the steam pressure sensor 6 detects that the steam pressure inside the outer tank 2 exceeds the preset threshold, it will immediately transmit the signal to the solenoid valve 7 electrically connected to it. After receiving the signal, the solenoid valve 7 will respond quickly and open the valve to discharge the excess steam from the outer tank 2 in time, thereby effectively avoiding safety accidents such as equipment damage and explosion caused by excessive steam pressure. The diagonal arrangement at the top and bottom makes the steam flow path in the equipment more reasonable, which helps the steam to be evenly distributed and the heat to be fully exchanged throughout the equipment.

[0036] A first exhaust pipe 9 is inserted into and fixedly connected to the reversing valve 8. A high-efficiency fan is connected to the end of the pipe. When the temperature inside the outer tank 2 needs to be reduced quickly during equipment operation, the fan starts. With its strong suction capacity, it can form a strong negative pressure in a short time. Through the connection between the first exhaust pipe 9 and the reversing valve 8, the hot steam inside the outer tank 2 is quickly extracted, achieving the purpose of quickly removing the heat from the outer tank 2. This provides a flexible temperature control method and diversified steam discharge paths for the production process. When the steam pressure and temperature inside the outer tank 2 are within the normal range, the reversing valve 8 can guide the steam to the third exhaust pipe 11, connecting it to the external pipeline to achieve normal steam discharge.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A caustic soda concentration device for chlor-alkali production, comprising an outer tank body (2), a rack (1) is fixedly installed at the bottom of the outer tank body (2), characterized in that, The motor (4) is fixedly connected to the output end of the rotating shaft (22), the inner tank (21) is fixedly connected in the outer tank (2), the heating module (20) is arranged at the bottom of the inner tank (21), the inlet (3) is arranged on the outer tank (2), the water inlet (5) is arranged on one side of the outer wall of the outer tank (2), the drain pipe (12) is arranged at the bottom of the outer tank (2), the blocking and heat preservation part is arranged in the outer tank (2), and the steam utilization assembly is arranged in the outer tank (2). The blocking and heat preservation part is used for blocking the rapid loss of water vapor and maintaining the temperature in the outer tank (2). The steam utilization assembly is used for guiding the steam from the inner tank (21) into the outer tank (2) and discharging the steam in the outer tank (2) when the steam in the outer tank (2) exceeds the threshold value, and the steam utilization assembly comprises a gas conveying mechanism and a discharge mechanism.

2. The caustic soda concentration apparatus for chlor-alkali production according to claim 1, characterized in that, The blocking and heat preservation part comprises a plurality of baffles (16) fixedly connected between the outer tank (2) and the inner tank (21), and the baffles (16) are provided with alternating holes (17) symmetrically distributed.

3. The caustic soda concentration apparatus for chlor-alkali production according to claim 2, characterized in that, The heat conduction plates (18) are fixedly connected between the two alternating holes (17) and are uniformly distributed.

4. The caustic soda concentration apparatus for chlor-alkali production according to claim 3, characterized in that, The heat conduction plates (18) are provided with through holes, and the through holes are fixedly connected with the communication mesh cover (19).

5. The caustic soda concentration apparatus for chlor-alkali production according to claim 1, characterized in that, The gas conveying mechanism comprises a communication pipe (13) inserted and fixedly connected to the outer tank (2), one end of the communication pipe (13) is fixedly connected and inserted into the inner tank (21), and the communication pipe (13) is provided with a one-way valve (14).

6. The caustic soda concentration apparatus for chlor-alkali production according to claim 1, characterized in that, The discharge mechanism comprises a second exhaust pipe (10) inserted and fixedly connected to one side of the bottom of the outer tank (2), the second exhaust pipe (10) is provided with a steam pressure sensor (6), the second exhaust pipe (10) is further provided with an electromagnetic valve (7), and the steam pressure sensor (6) and the electromagnetic valve (7) are electrically connected.

7. The caustic soda concentration apparatus for chlor-alkali production according to claim 1, characterized in that, The discharge mechanism and the gas conveying mechanism are diagonally arranged.

8. The caustic soda concentration apparatus for chlor-alkali production according to claim 6, characterized in that, The second exhaust pipe (10) is provided with a reversing valve (8), the reversing valve (8) is inserted and fixedly connected with the first exhaust pipe (9), and the end of the first exhaust pipe (9) is connected with a fan.

9. The caustic soda concentration apparatus for chlor-alkali production according to claim 8, characterized in that, The reversing valve (8) is inserted and fixedly connected with the third exhaust pipe (11), and the third exhaust pipe (11) is connected with an external pipeline.

10. The caustic soda concentration apparatus for chlor-alkali production according to claim 1, characterized in that, The rotating shaft (22) is fixedly connected with the uniformly distributed stirring blades (15).

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