Sodium bicarbonate production system and method

Abstract

The invention discloses a sodium bicarbonate production system and method, and belongs to the technical field of sodium bicarbonate production. The sodium bicarbonate production system comprises a reaction tank, a reaction cavity and a precipitation cavity are sequentially formed in the reaction tank from top to bottom, a separation cylinder is fixedly connected into the reaction tank, the upper portion of the separation cylinder is communicated with the reaction tank, the reaction cavity is divided into an outer reaction cavity and an inner reaction cavity through the separation cylinder, and a liquid injection mechanism is fixedly connected to the bottom of the reaction tank; the liquid injection mechanism is not communicated with the outer reaction cavity and the inner reaction cavity at the same time, two aeration structures arranged up and down are arranged in the reaction tank, the aeration structures are not communicated with the outer reaction cavity and the inner reaction cavity at the same time, and a stirring mechanism is mounted at the upper part of the reaction tank. According to the device, generated sodium bicarbonate crystals can move upwards in the injection process of the sodium chloride solution and fall into the precipitation cavity downwards after the sodium chloride solution stops being injected, the growth time of the sodium bicarbonate crystals is prolonged, and the sodium bicarbonate crystals with larger particle sizes can be formed easily.

Description

Technical Field

[0001] The present invention relates to the technical field of sodium bicarbonate production, and more specifically, to a sodium bicarbonate production system and method. Background Art

[0002] Sodium bicarbonate, commonly known as baking soda, is an important chemical raw material and food additive, and has wide applications in industries such as medicine, food, light industry, and chemical industry. The ammonia-soda process is one of the traditional sodium bicarbonate production processes. Its basic principle is to introduce ammonia gas and carbon dioxide into saturated brine to precipitate sodium bicarbonate crystals. The advantages of this method are wide raw material sources and large production scale.

[0003] After retrieval, the patent document with the existing publication number CN115945155B provides a device and method for producing sodium bicarbonate. This method simultaneously realizes the ammoniation (ammonia absorption), carbonation, formation and growth of sodium bicarbonate crystals in the same device. Through the large-flow circulation of the mother liquor, a lower supersaturation can be maintained in the reaction device, which is beneficial to the formation of large-grained sodium bicarbonate crystals and ensures the quality of the product.

[0004] The sodium bicarbonate crystals generated by the above device flow through the reactor main body from top to bottom under the stirring action, and the crystals gradually grow. The crystals with larger particles enter the bottom of the reactor. This reaction method will cause the growth time of sodium bicarbonate crystals to be limited by the length of the absorption reaction integrated device, which is not conducive to the preparation of large-sized sodium bicarbonate crystals. In view of this, we propose a sodium bicarbonate production system and method. Summary of the Invention

[0005] 1. Technical Problems to be Solved

[0006] The purpose of the present invention is to provide a sodium bicarbonate production system and method to solve the problems raised in the above background art.

[0007] 2. Technical Solutions

[0008] The present invention is realized through the following technical solutions:

[0009] A sodium bicarbonate production system and method, including a reaction tank, in which a reaction chamber and a precipitation chamber are successively arranged from top to bottom. A separation cylinder is fixedly connected inside the reaction tank. The upper part of the separation cylinder is communicated with the reaction tank. The separation cylinder divides the reaction chamber into an outer reaction chamber and an inner reaction chamber, and divides the precipitation chamber into an outer precipitation chamber and an inner precipitation chamber. A liquid injection mechanism is fixedly connected to the bottom of the reaction tank. The liquid injection mechanism is not simultaneously communicated with the outer reaction chamber and the inner reaction chamber. Two aeration structures arranged vertically are provided in the reaction tank. The aeration structures are not simultaneously communicated with the outer reaction chamber and the inner reaction chamber. A stirring mechanism is installed at the upper part of the reaction tank. An exhaust pipe is installed at the upper part of the reaction tank. Two first drain pipes are installed at the lower part of the reaction tank. The two first drain pipes are respectively communicated with the bottoms of the outer reaction chamber and the inner reaction chamber. Two second drain pipes are installed at the lower part of the reaction tank. The two second drain pipes are respectively communicated with the outer precipitation chamber and the inner precipitation chamber. A first driving motor is installed on the reaction tank. The first driving motor is used to switch the communication state between the liquid injection mechanism and the outer reaction chamber and the inner reaction chamber.

[0010] As an optional scheme of the technical solution of this application document, the liquid injection mechanism includes a liquid injection cylinder. A liquid injection chamber is provided in the liquid injection cylinder. A first liquid separation chamber is provided at the upper part of the liquid injection chamber. A second liquid separation chamber is provided outside the first liquid separation chamber. The first liquid separation chamber is communicated with the inner reaction chamber through a connecting pipe. The second liquid separation chamber is communicated with the outer reaction chamber. A first liquid injection port is provided between the first liquid separation chamber and the liquid injection chamber. A second liquid injection port is provided between the second liquid separation chamber and the liquid injection chamber.

[0011] As an optional scheme of the technical solution of this application document, a valve plate is provided in the liquid injection chamber. The valve plate is coaxially and fixedly connected to the output end of the first driving motor. A plurality of through holes are opened on the valve plate. The through holes are not simultaneously communicated with the first liquid injection port and the second liquid injection port.

[0012] As an optional scheme of the technical solution of this application document, the aeration structure includes an air injection pipe, a first aeration ring, a second aeration ring, and an air delivery pipe. The first aeration ring is fixedly arranged in the outer reaction chamber. The second aeration ring is fixedly arranged in the inner reaction chamber. The air delivery pipe is rotatably connected to both the first aeration ring and the second aeration ring. The air delivery pipe is not simultaneously communicated with the first aeration ring and the second aeration ring. One end of the air injection pipe is rotatably connected to and communicated with the air delivery pipe, and the other end extends to the outside of the reaction tank.

[0013] As an optional scheme of the technical solution of this application document, the two air injection pipes are coaxially and fixedly connected.

[0014] As an optional scheme of the technical solution of this application document, the air injection pipe is coaxially and fixedly connected to the output end of the first driving motor.

[0015] As an alternative solution to the technical solution of this application document, the stirring mechanism includes an outer rotating bracket, an inner rotating bracket, and a second driving motor. A plurality of stirring rods are fixedly connected to the lower parts of the outer rotating bracket and the inner rotating bracket respectively. The stirring rods at the lower parts of the outer rotating bracket and the inner rotating bracket extend into the outer reaction chamber and the inner reaction chamber respectively. The outer rotating bracket and the inner rotating bracket are both rotatably connected to the reaction tank. The second driving motor is fixedly installed on the reaction tank and is used to drive the outer rotating bracket and the inner rotating bracket to rotate.

[0016] As an alternative solution to the technical solution of this application document, a first toothed ring is fixedly connected to the upper end of the outer rotating bracket. The upper end of the inner rotating bracket passes through the first toothed ring and is fixedly connected to a second toothed ring. The outer rotating bracket and the inner rotating bracket are rotatably connected. A regulating shaft rod is rotatably connected inside the second toothed ring. The regulating shaft rod is coaxially connected and fixed to the output end of the first driving motor. A first gear and a second gear are rotatably connected to the outer side of the regulating shaft rod. The first gear is located below the second gear. The first gear meshes with the first toothed ring. The second gear meshes with the second toothed ring. The output end of the second driving motor is fixedly connected with a driving gear. The first gear and the second gear do not mesh with the driving gear simultaneously.

[0017] 3. Beneficial effects

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1) By providing a liquid injection mechanism in this application, the injection of sodium chloride solution into the outer reaction chamber or the inner reaction chamber can be controlled. And by providing a first drain pipe, the sodium chloride solution in the outer reaction chamber and the inner reaction chamber can be drained outwards, so that the generated sodium bicarbonate crystals can move upwards during the injection of the sodium chloride solution and fall down into the precipitation chamber after the injection of the sodium chloride solution stops, increasing the growth time of the sodium bicarbonate crystals and being beneficial to the formation of sodium bicarbonate crystals with larger particle sizes.

[0020] 2) By providing a first driving motor in this application, while the injection position of the liquid injection mechanism can be controlled by the first driving motor, the aeration position of the aeration structure can also be controlled, so that the outer reaction chamber and the inner reaction chamber can operate alternately, increasing the preparation efficiency of sodium bicarbonate.

[0021] 3) By providing a stirring mechanism in this application, when the injection position of the liquid injection mechanism and the aeration position of the aeration structure change, the stirring position of the stirring mechanism can change synchronously; the generation efficiency of sodium bicarbonate can be increased by stirring, and the adverse impact on the growth of sodium bicarbonate crystals caused by stirring can be avoided. Brief description of the drawings

[0022] Figure 1 is an overall structural schematic diagram of a sodium bicarbonate production system;

[0023] Figure 2 is a schematic diagram of the internal structure of a sodium bicarbonate production system;

[0024] Figure 3 is a schematic diagram of the liquid injection mechanism of a sodium bicarbonate production system;

[0025] Figure 4 is a schematic diagram of the aeration structure of a sodium bicarbonate production system;

[0026] Figure 5 is a schematic diagram of the gas transmission pipe structure of a sodium bicarbonate production system;

[0027] Figure 6 is a schematic diagram of the stirring mechanism of a sodium bicarbonate production system;

[0028] In the figure: 1, reaction tank; 101, outer reaction cavity; 102, outer precipitation cavity; 103, first drain pipe; 104, second drain pipe; 2, separation cylinder; 201, inner reaction cavity; 202, inner precipitation cavity; 3, liquid injection mechanism; 301, liquid injection cylinder; 302, liquid injection cavity; 303, first liquid separation cavity; 304, second liquid separation cavity; 305, first liquid injection port; 306, second liquid injection port; 307, valve plate; 308, through hole; 4, aeration structure; 401, gas injection pipe; 402, first aeration ring; 403, second aeration ring; 404, gas transmission pipe; 5, stirring mechanism; 501, outer rotating support; 5011, first toothed ring; 502, inner rotating support; 5021, second toothed ring; 503, second driving motor; 504, stirring rod; 505, adjusting shaft rod; 5051, first gear; 5052, second gear; 506, driving gear; 6, first driving motor. Specific embodiments

[0029] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings.

[0030] Example 1:

[0031] Please refer to Figure 1 and Figure 2, The present invention provides a sodium bicarbonate production system, including a reaction tank 1. Inside the reaction tank 1, a reaction chamber and a precipitation chamber are arranged in sequence from top to bottom. A separation cylinder 2 is fixedly connected inside the reaction tank 1. The upper part of the separation cylinder 2 communicates with the reaction tank 1. The separation cylinder 2 divides the reaction chamber into an outer reaction chamber 101 and an inner reaction chamber 201, and divides the precipitation chamber into an outer precipitation chamber 102 and an inner precipitation chamber 202. A liquid injection mechanism 3 is fixedly connected to the bottom of the reaction tank 1. The liquid injection mechanism 3 is not simultaneously connected to the outer reaction chamber 101 and the inner reaction chamber 201. There are two aeration structures 4 arranged vertically inside the reaction tank 1. The aeration structures 4 are not simultaneously connected to the outer reaction chamber 101 and the inner reaction chamber 201. A stirring mechanism 5 is installed on the upper part of the reaction tank 1. An exhaust pipe is installed on the upper part of the reaction tank 1. Two first drain pipes 103 are installed on the lower part of the reaction tank 1. The two first drain pipes 103 are respectively connected to the bottoms of the outer reaction chamber 101 and the inner reaction chamber 201. Two second drain pipes 104 are installed on the lower part of the reaction tank 1. The two second drain pipes 104 are respectively connected to the outer precipitation chamber 102 and the inner precipitation chamber 202. A first driving motor 6 is installed on the reaction tank 1. The first driving motor 6 is used to switch the connection state between the liquid injection mechanism 3 and the outer reaction chamber 101 and the inner reaction chamber 201.

[0032] In this production system, the liquid injection mechanism 3 is used to inject sodium chloride solution into the outer reaction chamber 101 and the inner reaction chamber 201 in sequence. When injecting sodium chloride solution into the outer reaction chamber 101, the aeration structure 4 is controlled to inject ammonia and carbon dioxide into the outer reaction chamber 101. When injecting sodium chloride solution into the inner reaction chamber 201, the aeration structure 4 is controlled to inject ammonia and carbon dioxide into the outer reaction chamber 101. It should be noted that the aeration structure 4 located below is used to inject ammonia into the reaction chamber, and the aeration structure 4 located above is used to inject carbon dioxide into the reaction chamber. When injecting sodium chloride solution, ammonia, and carbon dioxide into one of the outer reaction chamber 101 and the inner reaction chamber 201, the injection of sodium chloride solution, ammonia, and carbon dioxide into the other reaction chamber should be stopped. For example, when injecting sodium chloride solution, ammonia, and carbon dioxide into the outer reaction chamber 101, the sodium chloride solution will first absorb ammonia and then react with carbon dioxide to produce sodium bicarbonate crystals. As the sodium bicarbonate crystals grow while flowing upward in the outer reaction chamber 101 with the sodium chloride solution. By switching the sodium chloride solution, ammonia, and carbon dioxide to the inner reaction chamber 201, the preparation process of sodium bicarbonate is repeated. At this time, the sodium chloride solution in the outer reaction chamber 101 is discharged outward through the first drain pipe 103. The sodium bicarbonate crystals can move downward along the outer reaction chamber 101 under the action of gravity and continue to grow. The large-sized sodium bicarbonate crystals can fall into the outer precipitation chamber 102, and the small-sized sodium bicarbonate crystals can be discharged outward through the first drain pipe 103 and re-injected into the outer reaction chamber 101 and / or the inner reaction chamber 201. In this system, a longer growth time can be provided for the sodium bicarbonate crystals, which is beneficial to the preparation of large-sized sodium bicarbonate crystals. After a certain period of time, the sodium bicarbonate crystals in the outer precipitation chamber 102 and the inner precipitation chamber 202 can be discharged outward through the second drain pipe 104.

[0033] As Figure 3 shown, the liquid injection mechanism 3 includes a liquid injection cylinder 301. A liquid injection chamber 302 is provided inside the liquid injection cylinder 301. A first liquid separation chamber 303 is provided at the upper part of the liquid injection chamber 302. A second liquid separation chamber 304 is provided outside the first liquid separation chamber 303. The first liquid separation chamber 303 is communicated with the inner reaction chamber 201 through a connecting pipe. The second liquid separation chamber 304 is communicated with the outer reaction chamber 101. A first liquid injection port 305 is provided between the first liquid separation chamber 303 and the liquid injection chamber 302. A second liquid injection port 306 is provided between the second liquid separation chamber 304 and the liquid injection chamber 302. A valve plate 307 is provided inside the liquid injection chamber 302. The valve plate 307 is coaxially connected and fixed to the output end of the first driving motor 6. A plurality of through holes 308 are provided on the valve plate 307, and the through holes 308 are not simultaneously communicated with the first liquid injection port 305 and the second liquid injection port 306.

[0034] Preferably, the first liquid injection port 305 and the second liquid injection port 306 are arranged at an interval of 90 degrees. A plurality of through holes 308 are arranged in a straight line on the valve plate 307. The valve plate 307 is driven by the first driving motor 6 to rotate 90 degrees, changing the position of the through holes 308, controlling the communication state between the through holes 308 and the first liquid injection port 305 and the second liquid injection port 306, and realizing the switching of the injection of sodium chloride solution into the external reaction chamber 101 and the internal reaction chamber 201. When the first liquid injection port 305 is in communication with the through holes 308, the sodium chloride solution in the liquid injection chamber 302 will be injected into the first liquid distribution chamber 303, and then evenly injected into the internal reaction chamber 201 through the connecting pipe, and react with ammonia and carbon dioxide to prepare sodium bicarbonate.

[0035] As Figure 4 shown in Figure 5 FIG. 7, the aeration structure 4 includes an air injection pipe 401, a first aeration ring 402, a second aeration ring 403, and an air delivery pipe 404. The first aeration ring 402 is fixedly arranged in the external reaction chamber 101, the second aeration ring 403 is fixedly arranged in the internal reaction chamber 201, the air delivery pipe 404 is rotatably connected to both the first aeration ring 402 and the second aeration ring 403, the air delivery pipe 404 is not simultaneously in communication with the first aeration ring 402 and the second aeration ring 403, and one end of the air injection pipe 401 is rotatably connected and communicated with the air delivery pipe 404, and the other end extends to the outside of the reaction tank 1.

[0036] Preferably, an air injection ring is fixedly connected to one end of the air injection pipe 401, the air delivery pipe 404 is rotatably connected in the air injection ring, and the air injection pipe 401 can inject gas into the air delivery pipe 404 through the first through hole opened in the upper part of the air delivery pipe 404 and the air injection ring. Second through holes and third through holes are also opened on the outer side of the air delivery pipe 404, and the second through holes and the third through holes are arranged at an interval of 90 degrees; the first aeration ring 402 and the second aeration ring 403 are provided with air inlets in the same direction in the middle. By driving the air delivery pipe 404 to rotate, the orientation of the second through holes and the third through holes can be changed, realizing the start-stop control of the first aeration ring 402 and the second aeration ring 403.

[0037] Two air injection pipes 401 are coaxially connected and fixed, and the air injection pipe 401 is coaxially connected and fixed to the output end of the first driving motor 6. When the first driving motor 6 drives the valve plate 307 to rotate, the air injection pipe 401 can be synchronously driven to rotate, realizing the synchronous switching of the injection positions of the sodium chloride solution, ammonia, and carbon dioxide, and simplifying the control process.

[0038] As Figure 6As shown in the figure, the stirring mechanism 5 includes an outer rotating bracket 501, an inner rotating bracket 502 and a second driving motor 503. A plurality of stirring rods 504 are fixedly connected to the lower parts of the outer rotating bracket 501 and the inner rotating bracket 502. The stirring rods 504 at the lower parts of the outer rotating bracket 501 and the inner rotating bracket 502 respectively extend into the outer reaction chamber 101 and the inner reaction chamber 201. The outer rotating bracket 501 and the inner rotating bracket 502 are both rotatably connected to the reaction tank 1. The second driving motor 503 is fixedly installed on the reaction tank 1 and is used to drive the outer rotating bracket 501 and the inner rotating bracket 502 to rotate. A first gear ring 5011 is fixedly connected to the upper end of the outer rotating bracket 501. The upper end of the inner rotating bracket 502 passes through the first gear ring 5011 and is fixedly connected to a second gear ring 5021. The outer rotating bracket 501 and the inner rotating bracket 502 are rotatably connected. A regulating shaft rod 505 is rotatably connected inside the second gear ring 5021. The regulating shaft rod 505 is coaxially connected and fixed to the output end of the first driving motor 6. A first gear 5051 and a second gear 5052 are rotatably connected to the outer side of the regulating shaft rod 505. The first gear 5051 is located below the second gear 5052. The first gear 5051 meshes with the first gear ring 5011, and the second gear 5052 meshes with the second gear ring 5021. The output end of the second driving motor 503 is fixedly connected to a driving gear 506. The first gear 5051 and the second gear 5052 do not mesh with the driving gear 506 at the same time.

[0039] Preferably, the first gear 5051 and the second gear 5052 are arranged at an interval of 90 degrees. When the first driving motor 6 switches the injection positions of sodium chloride solution, ammonia gas, and carbon dioxide, the first driving motor 6 will change the positions of the first gear 5051 and the second gear 5052 through the regulating shaft rod 505, and switch the meshing states of the first gear 5051, the second gear 5052 and the driving gear 506. When the sodium chloride solution, ammonia gas, and carbon dioxide are injected into the outer reaction chamber 101, the first gear 5051 will mesh with the driving gear 506. The first driving motor 6 can drive the outer rotating bracket 501 to rotate through the driving gear 506, the first gear 5051, and the first gear ring 5011, and use the stirring rod 504 at the bottom of the outer rotating bracket 501 to stir the reactants in the outer reaction chamber 101 to increase the reaction rate.

[0040] When the sodium chloride solution, ammonia gas, and carbon dioxide are injected into the inner reaction chamber 201, the second gear 5052 will mesh with the driving gear 506. The first driving motor 6 can drive the inner rotating bracket 502 to rotate through the driving gear 506, the second gear 5052, and the second gear ring 5021, and use the stirring rod 504 at the bottom of the inner rotating bracket 502 to stir the reactants in the inner reaction chamber 201; at this time, the stirring rod 504 in the outer reaction chamber 101 stops rotating, avoiding adverse effects on the growth of sodium bicarbonate crystals in the outer reaction chamber 101, which is beneficial to the preparation of large-sized sodium bicarbonate crystals.

[0041] Example 2:

[0042] This application provides a method for producing sodium bicarbonate. A sodium bicarbonate production system described in Example 1 is adopted, including the following steps:

[0043] S1. Use the liquid injection mechanism 3 to inject sodium chloride solution into the outer reaction chamber 101, use the aeration structure 4 located below to inject ammonia gas into the outer reaction chamber 101, use the aeration structure 4 located above to inject carbon dioxide into the outer reaction chamber 101, and control the liquid level in the outer reaction chamber 101 to be below the top of the separation cylinder 2;

[0044] S2. Use the liquid injection mechanism 3 to inject sodium chloride solution into the inner reaction chamber 201, use the aeration structure 4 located below to inject ammonia gas into the inner reaction chamber 201, use the aeration structure 4 located above to inject carbon dioxide into the inner reaction chamber 201, and control the liquid level in the inner reaction chamber 201 to be below the top of the separation cylinder 2;

[0045] S3. Use the first drain pipe 103 to drain the sodium chloride solution in the outer reaction chamber 101;

[0046] S4. Use the liquid injection mechanism 3 to inject sodium chloride solution into the outer reaction chamber 101, use the aeration structure 4 located below to inject ammonia gas into the outer reaction chamber 101, use the aeration structure 4 located above to inject carbon dioxide into the outer reaction chamber 101, and control the liquid level in the outer reaction chamber 101 to be below the top of the separation cylinder 2;

[0047] S5. Use the first drain pipe 103 to drain the sodium chloride solution in the inner reaction chamber 201;

[0048] S6. Recycle the drained sodium chloride solution and repeat S1 to S5;

[0049] S7. Use the second drain pipe 104 to drain the sodium hydroxide crystals in the outer precipitation chamber 102 and the inner precipitation chamber 202 outwards.

[0050] By adopting this method, the generated sodium bicarbonate crystals can not only grow during the upward flow of the sodium chloride solution, but also move from top to bottom and continue to grow during the downward discharge of the sodium chloride solution. By increasing the growth time of the sodium bicarbonate crystals, large-sized sodium bicarbonate crystals can be obtained.

Claims

1. A sodium bicarbonate production system, characterized in that: The invention comprises a reaction tank (1), wherein a reaction chamber and a sedimentation chamber are sequentially arranged from top to bottom in the reaction tank (1), a separation cylinder (2) is fixedly connected inside the reaction tank (1), the upper part of the separation cylinder (2) is communicated with the reaction tank (1), the separation cylinder (2) divides the reaction chamber into an outer reaction chamber (101) and an inner reaction chamber (201), the separation cylinder (2) divides the sedimentation chamber into an outer sedimentation chamber (102) and an inner sedimentation chamber (202), a liquid injection mechanism (3) is fixedly connected to the bottom of the reaction tank (1), the liquid injection mechanism (3) is not communicated with the outer reaction chamber (101) and the inner reaction chamber (201) at the same time, and two aeration structures (4) arranged up and down are arranged inside the reaction tank (1), the aeration structure (4) is connected to the outer reaction chamber (101) and the inner reaction chamber (201) The reaction tank (1) and the inner reaction chamber (201) are not connected at the same time. A stirring mechanism (5) is installed on the upper part of the reaction tank (1). An exhaust pipe is installed on the upper part of the reaction tank (1). Two first liquid discharge pipes (103) are installed on the lower part of the reaction tank (1). The two first liquid discharge pipes (103) are respectively connected to the bottom of the outer reaction chamber (101) and the inner reaction chamber (201). Two second liquid discharge pipes (104) are installed on the lower part of the reaction tank (1). The two second liquid discharge pipes (104) are respectively connected to the outer precipitation chamber (102) and the inner precipitation chamber (202). A first drive motor (6) is installed on the reaction tank (1). The first drive motor (6) is used to switch the connection state between the liquid injection mechanism (3) and the outer reaction chamber (101) and the inner reaction chamber (201).

2. A sodium bicarbonate production system according to claim 1, characterized in that: The liquid injection mechanism (3) comprises a liquid injection cylinder (301), a liquid injection chamber (302) is provided in the liquid injection cylinder (301), a first liquid separation chamber (303) is provided on the upper part of the liquid injection chamber (302), a second liquid separation chamber (304) is provided on the outer side of the first liquid separation chamber (303), the first liquid separation chamber (303) is connected to the inner reaction chamber (201) through a connecting tube, the second liquid separation chamber (304) is connected to the outer reaction chamber (101), a first liquid injection port (305) is provided between the first liquid separation chamber (303) and the liquid injection chamber (302), and a second liquid injection port (306) is provided between the second liquid separation chamber (304) and the liquid injection chamber (302).

3. A sodium bicarbonate production system according to claim 2, characterized in that: A valve plate (307) is provided in the injection cavity (302), and the valve plate (307) is coaxially connected and fixed to the output end of the first drive motor (6). A plurality of through holes (308) are provided on the valve plate (307), and the through holes (308) are not connected to the first injection port (305) and the second injection port (306) at the same time.

4. A sodium bicarbonate production system according to claim 1, characterized in that: The aeration structure (4) comprises an air injection pipe (401), a first aeration ring (402), a second aeration ring (403), and an air delivery pipe (404); the first aeration ring (402) is fixedly arranged in the outer reaction chamber (101); the second aeration ring (403) is fixedly arranged in the inner reaction chamber (201); the air delivery pipe (404) is rotatably connected to the first aeration ring (402) and the second aeration ring (403); the air delivery pipe (404) is not connected to the first aeration ring (402) and the second aeration ring (403) at the same time; one end of the air injection pipe (401) is rotatably connected to and connected to the air delivery pipe (404), and the other end extends to the outside of the reaction tank (1).

5. A sodium bicarbonate production system according to claim 4, characterized in that: The two gas injection pipes (401) are coaxially connected and fixed.

6. A sodium bicarbonate production system according to claim 5, characterized in that: The gas injection pipe (401) is coaxially connected and fixed to the output end of the first drive motor (6).

7. A sodium bicarbonate production system according to claim 1, characterized in that: The stirring mechanism (5) comprises an outer rotating bracket (501), an inner rotating bracket (502) and a second driving motor (503); a plurality of stirring rods (504) are fixedly connected to the lower parts of the outer rotating bracket (501) and the inner rotating bracket (502); the stirring rods (504) at the lower parts of the outer rotating bracket (501) and the inner rotating bracket (502) extend into the outer reaction chamber (101) and the inner reaction chamber (201) respectively; the outer rotating bracket (501) and the inner rotating bracket (502) are both rotatably connected to the reaction tank (1); the second driving motor (503) is fixedly mounted on the reaction tank (1) and is used to drive the outer rotating bracket (501) and the inner rotating bracket (502) to rotate.

8. A sodium bicarbonate production system according to claim 7, characterized in that: The upper end of the outer rotating bracket (501) is fixedly connected to a first gear ring (5011), the upper end of the inner rotating bracket (502) passes through the first gear ring (5011) and is fixedly connected to a second gear ring (5021), the outer rotating bracket (501) is rotatably connected to the inner rotating bracket (502), the second gear ring (5021) is rotatably connected to an adjusting shaft (505), the adjusting shaft (505) is coaxially connected and fixed to the output end of the first driving motor (6), and the outer side of the adjusting shaft (505) is A first gear (5051) and a second gear (5052) are rotatably connected, the first gear (5051) is located below the second gear (5052), the first gear (5051) is meshed with a first gear ring (5011), the second gear (5052) is meshed with a second gear ring (5021), and the output end of the second drive motor (503) is fixedly connected with a driving gear (506), and the first gear (5051) and the second gear (5052) are not meshed with the driving gear (506) at the same time.

9. A method for producing sodium bicarbonate, using a sodium bicarbonate production system as described in any one of claims 1 to 8, characterized in that: The following steps are involved: S1, injecting sodium chloride solution into the outer reaction chamber (101) using the liquid injection mechanism (3), injecting ammonia gas into the outer reaction chamber (101) using the aeration structure (4) located below, and injecting carbon dioxide into the outer reaction chamber (101) using the aeration structure (4) located above, and controlling the liquid level in the outer reaction chamber (101) to be maintained below the top of the separation cylinder (2); S2, injecting sodium chloride solution into the inner reaction chamber (201) using the liquid injection mechanism (3), injecting ammonia gas into the inner reaction chamber (201) using the aeration structure (4) located below, and injecting carbon dioxide into the inner reaction chamber (201) using the aeration structure (4) located above, and controlling the liquid level in the inner reaction chamber (201) to remain below the top of the separation cylinder (2); S3, using the first liquid discharge pipe (103) to discharge the sodium chloride solution in the outer reaction chamber (101); S4, injecting sodium chloride solution into the outer reaction chamber (101) using the liquid injection mechanism (3), injecting ammonia gas into the outer reaction chamber (101) using the aeration structure (4) located below, and injecting carbon dioxide into the outer reaction chamber (101) using the aeration structure (4) located above, and controlling the liquid level in the outer reaction chamber (101) to remain below the top of the separation cylinder (2); S5, using the first liquid discharge pipe (103) to discharge the sodium chloride solution in the inner reaction chamber (201); S6, recycling the discharged sodium chloride solution, and repeating S1 to S5; S7. Use the second liquid discharge pipe (104) to discharge the sodium hydroxide crystals in the outer precipitation chamber (102) and the inner precipitation chamber (202).

Images