A continuous crystallization system and process for baking soda

Abstract

The present invention discloses a sodium bicarbonate continuous crystallization system and process thereof, comprising a continuous crystallization tank, wherein a cooling mechanism for the flow of coolant is provided in the continuous crystallization tank, the cooling mechanism comprising a cooling mesh pipe, the cooling mesh pipe being annular, a first connecting pipe being provided at the inner ring of one side of the cooling mesh pipe, and a second connecting pipe being provided at the outer ring of the other side of the cooling mesh pipe, adjacent cooling mesh pipes being connected via the corresponding first connecting pipe and the second connecting pipe, respectively, a feed trough being provided at the bottom of the continuous crystallization tank, and a conveying mechanism for conveying the crystallized material outward being provided in the feed trough. The cooling mechanism is distributed more evenly in the continuous crystallization tank, the coolant is distributed more evenly in the continuous crystallization tank, the coolant can more fully cool down and crystallize the material in the continuous crystallization tank, and the crystallization efficiency is improved; the present invention overcomes the shortcomings of the prior art, has a reasonable design, a compact structure, and has high social use value and application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical industry, and in particular to a sodium bicarbonate continuous crystallization system and a process thereof. Background Art

[0002] Baking soda (sodium thiosulfate) is mainly used as a fixer in the photographic industry, a reducing agent for dichromate in leather tanning, a neutralizer for nitrogen-containing tail gas, a mordant, a bleaching agent for wheat straw and wool, and a dechlorination agent in pulp bleaching.

[0003] In the production process of baking soda, it is difficult to solve the problem of production capacity and output due to the single-pot crystallization operation. In terms of operation, traditional kettle crystallization has the characteristics of cumbersome operation and large amount of wastewater generation, which has a great negative impact on the safety of production personnel and environmental protection.

[0004] In order to solve the above problems, new processes and methods are adopted to optimize and adjust the continuous crystallization production of baking soda. The continuous crystallization process of baking soda is used for continuous feeding and continuous discharging, which greatly increases the production capacity and output of baking soda production. The operation is simple, and the system is in a closed environment, which reduces pollution to the environment. This method has the advantages of energy saving, environmental protection, and high efficiency.

[0005] Moreover, during the production process, the inventors discovered that the existing continuous crystallization tanks often fail to scrape off the crystal particles in time, resulting in low overall crystallization efficiency and affecting the overall output.

[0006] Therefore, in view of this, the inventor, based on his many years of rich experience in design, development and actual production in the relevant industry, has conducted research and improvements on the existing structure and deficiencies, and provided a baking soda continuous crystallization system and process, in order to achieve a more practical purpose. Summary of the Invention

[0007] In order to solve the problem mentioned in the above background technology that the inventors found that during the production process, the existing continuous crystallization tanks are often not scraped off in time due to the low overall crystallization efficiency, thereby affecting the overall output, the present invention provides a baking soda continuous crystallization system and process.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A soda continuous crystallization system comprises a continuous crystallization tank, wherein a feed pipe is provided at one end of the continuous crystallization tank, a discharge pipe is provided at the other end of the continuous crystallization tank, and a cooling mechanism for the flow of coolant is provided in the continuous crystallization tank, wherein the cooling mechanism comprises a cooling mesh pipe, the cooling mesh pipe is annular, a first connecting pipe is provided at the inner ring of one side of the cooling mesh pipe, and a second connecting pipe is provided at the outer ring of the other side of the cooling mesh pipe, adjacent cooling mesh pipes are connected via corresponding first connecting pipes and second connecting pipes respectively, a feed trough is provided at the bottom of the continuous crystallization tank, and a conveying mechanism for conveying the crystallized material outward is provided in the feed trough.

[0010] Preferably, partition plates are provided between the cooling network pipes for causing the material to flow in an S-shape in the continuous crystallization tank.

[0011] Preferably, the partition plate is slidably and sealedly connected to the inner wall of the continuous crystallization tank, wherein the lower half of one of the partition plates is provided with a through-type first guide hole, and the upper half of an adjacent partition plate is provided with a through-type second guide hole, and the first guide hole and the second guide hole are staggered and distributed on the partition plate.

[0012] Preferably, the partition plate can be arranged in the continuous crystallization tank to move back and forth periodically, and the partition plate is provided with a first scraping hole for scraping off the crystal particles on the first connecting tube, and the partition plate is also provided with a second scraping hole for scraping off the crystal particles on the second connecting tube.

[0013] Preferably, a rotatable adjustment shaft is provided in the middle of the continuous crystallization tank, the adjustment shaft moves through the center of the partition plate, the adjustment shaft is provided with multiple sections of reciprocating threads, and the adjustment shaft is connected to the middle of the partition plate through reciprocating threads.

[0014] Preferably, the conveying mechanism includes a conveying auger, the continuous crystallization tank is a horizontally placed cylindrical tank, the feed trough is arranged at the bottom of the continuous crystallization tank for collecting crystal particles, and a rotatable conveying auger is provided in the feed trough, and the end of the connecting crystallization tank is provided with a feed pipe connected to the conveying end of the feed trough.

[0015] Preferably, the cooling network pipe includes a guide pipe, an outer ring pipe and an inner ring pipe. There are multiple guide pipes, and the guide pipes are arranged between the inner ring pipe and the outer ring pipe. The first connecting pipe is connected to the inner ring pipe, and the second connecting pipe is connected to the outer ring pipe.

[0016] Preferably, there are multiple guide tubes, and the guide tubes are evenly distributed radially outside the inner ring tube. The guide tubes are each provided with a scraper ring that can move back and forth to scrape off the crystal particles on the guide tubes.

[0017] Preferably, a rotatable spiral plate is provided on one side of the cooling network pipe. The spiral plate is in a spiral shape, and a plurality of slidingly connected guide rods are provided inside the spiral plate. The ends of the guide rods are fixedly connected to the scraper ring.

[0018] A continuous crystallization process for sodium bicarbonate comprises the following steps:

[0019] (1) Crystallization of semi-finished products: transport the evaporated water of baking soda into the mother liquor tank through a pump; pump the baking soda solution into the continuous crystallization feed tank with the mother liquor pump; start the stirring of the feed tank and control the feed tank temperature to 40-50℃ through the jacket hot water; start the continuous crystallization feed pump and control the feed flow rate to 2m³ / h through frequency conversion; stop feeding when the feed reaches the overflow port, start the water circulation pump, control the cooling water temperature to 25℃ through the cooling water regulating valve, and control the water flow rate to 10m³ / h through the crystallizer inlet regulating valve; when the outlet temperature drops to 35℃, restart the feed pump and continuously feed at 5m³ / h; at the same time, open the crystallizer inlet regulating valve to maintain the discharge temperature at 35℃; control the discharge buffer tank temperature to be consistent with the crystallizer outlet temperature through the discharge buffer tank inlet regulating valve; analyze the discharge solid content and product quality by centrifugal separation;

[0020] (2) Finished product crystallization: The semi-finished product is used as raw material and put into the mother liquor tank; 40% of the water of the semi-finished product is added to the mother liquor tank and heated to dissolve; when all the crystals are dissolved, they are transported to the crystallizer feed buffer tank through the mother liquor pump; the crystallization operation is carried out in the same way as the semi-finished product crystallization; when a batch of crystallization is completed, the semi-finished product with the same amount of finished product is put into the mother liquor tank, mixed with the centrifuged mother liquor and dissolved, and then returned to the crystallization feed tank, and the operation is repeated.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The design of the cooling network pipe, the first connecting pipe and the second connecting pipe enables the cooling mechanism to be more evenly distributed in the continuous crystallization tank, and the coolant to be more evenly distributed in the continuous crystallization tank, so that the coolant can more fully cool and crystallize the material in the continuous crystallization tank, thereby improving the crystallization efficiency. The feed trough and the conveying mechanism enable the crystal particles precipitated in the continuous crystallization tank to be conveyed and discharged in a timely manner, thereby preventing excessive accumulation of crystal particles.

[0023] The design of the partition plate can change the flow path of the material, making the trajectory of the material into an S-shape when entering the continuous crystallization tank, thereby fully improving the residence time of the material in the continuous crystallization tank, thereby improving the cooling and crystallization efficiency of the cooling mechanism for the material, and the S-shaped motion trajectory enables the crystal particles to be better settled at the bottom of the continuous crystallization tank, so that the conveying mechanism can better convey and discharge the crystal particles in the continuous crystallization tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the continuous crystallization tank of the present invention.

[0026] Figure 2 It is a schematic diagram of the three-dimensional structure of the cooling mechanism and the conveying mechanism of the present invention.

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the partition plate and the conveying mechanism of the present invention.

[0028] Figure 4 It is a schematic diagram of the three-dimensional structure of the conveying auger and the first drive motor of the present invention.

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of the partition plate, spiral plate and cooling mechanism of the present invention.

[0030] Figure 6 It is a schematic diagram of the three-dimensional structure of the spiral mechanism and the cooling mechanism after the separation plate of the present invention is separated.

[0031] Figure 7 It is a schematic diagram of the three-dimensional structure of the spiral plate and the guide tube of the present invention.

[0032] Figure 8 It is a schematic diagram of the cross-sectional structure of the scraper ring and the guide rod of the present invention.

[0033] In the figure: 1. continuous crystallization tank; 11. second drive motor; 111. adjusting shaft; 12. fixed base; 13. feed pipe; 14. discharge pipe; 15. conveying trough; 21. drainage pipe; 22. water inlet pipe; 23. outer ring pipe; 24. second connecting pipe; 25. first connecting pipe; 26. inner ring pipe; 27. guide pipe; 28. spiral plate; 29. ​​guide rod; 291. scraper ring; 3. first drive motor; 31. conveying auger; 4. partition plate; 41. second guide hole; 42. second scraper hole; 43. first scraper hole; 44. first guide hole; 45. adjusting hole. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0035] Example 1

[0036] Reference Figure 1-2 A baking soda continuous crystallization system comprises a continuous crystallization tank 1, wherein a feed pipe 13 is provided at one end of the continuous crystallization tube, a discharge pipe 14 is provided at the other end of the continuous crystallization tank 1, and a cooling mechanism for the flow of coolant is provided in the continuous crystallization tank 1, wherein the cooling mechanism comprises a cooling mesh pipe, the cooling mesh pipe is annular, a first connecting pipe 25 is provided at the inner ring of one side of the cooling mesh pipe, and a second connecting pipe 24 is provided at the outer ring of the other side of the cooling mesh pipe, and adjacent cooling mesh pipes are connected by corresponding first connecting pipes 25 and second connecting pipes 24 respectively, and a feed trough 15 is provided at the bottom of the continuous crystallization tank 1, and a conveying mechanism for conveying the crystallized material outward is provided in the feed trough 15. The design of the cooling network pipe, the first connecting pipe 25 and the second connecting pipe 24 makes the cooling mechanism more evenly distributed in the continuous crystallization tank 1, and can make the coolant more evenly distributed in the continuous crystallization tank 1, so that the coolant can more fully cool and crystallize the material in the continuous crystallization tank 1, thereby improving the crystallization efficiency. The feed trough 15 and the conveying mechanism can timely convey and discharge the precipitated crystal particles in the continuous crystallization tank 1 to prevent excessive accumulation of crystal particles.

[0037] In this embodiment, referring to Figure 1 , further comprising a water inlet pipe 22 for the coolant to enter and a drain pipe 21 for the coolant to discharge, the water inlet pipe 22 and the drain pipe 21 being respectively arranged at both ends of the cooling mechanism, and the water inlet pipe 22 and the drain pipe 21 being respectively connected to the outside of the corresponding cooling network pipe. The bottom of the continuous crystallization tank 1 is provided with a fixed base 12 for support.

[0038] In this embodiment, referring to Figure 2 The cooling network pipe includes a guide pipe 27, an outer ring pipe 23 and an inner ring pipe 26. There are multiple guide pipes 27, and the guide pipe 27 is arranged between the inner ring pipe 26 and the outer ring pipe 23. The first connecting pipe 25 is connected to the inner ring pipe 26, and the second connecting pipe 24 is connected to the outer ring pipe 23. The design of the guide pipe 27, the outer ring pipe 23 and the inner ring pipe 26 not only realizes the diversion of the coolant, but also enables a more uniform distribution of the cooling network pipes in the continuous crystallization tank 1.

[0039] In this embodiment, referring to Figure 4 The conveying mechanism includes a conveying auger 31. The continuous crystallization tank 1 is a horizontally placed cylindrical tank. The feed trough 15 is provided at the bottom of the continuous crystallization tank 1 for collecting the crystal particles. A rotatable conveying auger 31 is provided in the feed trough 15. The end of the connecting crystallization tank is provided with a feed pipe connected to the conveying end of the feed trough 15. The design of the conveying auger 31 can utilize the spiral conveying method of the auger to discharge the crystal particles in a timely manner. One end of the continuous crystallization tank 1 is provided with a fixedly connected first drive motor 3, and the output end of the first drive motor 3 is connected to the conveying auger 31.

[0040] Example 2

[0041] The same points as Example 1 are not described here. The differences from Example 1 are as follows:

[0042] Reference Figure 3 , a partition plate 4 is provided between the cooling network pipes for making the material flow in an S-shape in the continuous crystallization tank 1. The design of the partition plate 4 can change the flow path of the material so that the trajectory of the material entering the continuous crystallization tank 1 is S-shaped, thereby fully improving the residence time of the material in the continuous crystallization tank 1, thereby improving the cooling and crystallization efficiency of the cooling mechanism for the material, and the S-shaped motion trajectory enables the crystal particles to be better deposited at the bottom of the continuous crystallization tank 1, so that the conveying mechanism can better convey and discharge the crystal particles in the continuous crystallization tank 1.

[0043] In this embodiment, referring to Figure 3 The partition plate 4 is slidably and hermetically connected to the inner wall of the continuous crystallization tank 1. A through-type first guide hole 44 is provided on the lower half of one of the partition plates 4, and a through-type second guide hole 41 is provided on the upper half of an adjacent partition plate 4. The first guide holes 44 and the second guide holes 41 are staggered and spaced apart on the partition plate 4. The sliding and hermetically connected between the partition plate 4 and the continuous crystallization tank 1, as well as the design of the first guide holes 44 and the second guide holes 41, enable the material to better perform an S-shaped trajectory movement within the continuous crystallization tank 1.

[0044] In this embodiment, referring to Figure 3 and Figure 6The partition plate 4 is arranged in the continuous crystallization tank 1 so as to be able to move back and forth periodically. The partition plate 4 is provided with a first scraping hole 43 for scraping off the crystal particles on the first connecting tube 25, and the partition plate 4 is also provided with a second scraping hole 42 for scraping off the crystal particles on the second connecting tube 24. The design of the first scraping hole 43 and the second scraping hole 42 enables the partition plate 4 to move back and forth periodically, driving the first scraping hole 43 and the second scraping hole 42 to timely scrape off the crystal particles on the corresponding first connecting tube 25 and the second connecting tube 24, effectively preventing the decrease in the overall crystallization efficiency caused by excessive crystal particles on the first connecting tube 25 and the second connecting tube 24. Moreover, the timely scraping off of the crystal particles allows them to be promptly discharged through the conveying mechanism.

[0045] In this embodiment, referring to Figure 3 and Figure 6 The continuous crystallization tank 1 is provided with a rotatable adjustment shaft 111 in the middle, and an adjustment hole 45 is provided in the center of the partition plate 4. The adjustment shaft 111 is movable through the adjustment hole 45. The adjustment shaft 111 is provided with multiple reciprocating threads, and the adjustment shaft 111 is connected to the adjustment hole 45 in the middle of the partition plate 4 via a reciprocating thread. The design of the reciprocating thread can utilize the reciprocating thread, coupled with the continuous rotation of the adjustment shaft 111, to cause the partition plate 4 to reciprocate periodically on the adjustment shaft 111 along the reciprocating thread, thereby achieving synchronous periodic reciprocating motion of multiple partition plates 4.

[0046] Wherein, a second driving motor 11 is provided on one side of the continuous crystallization tank 1 , and an output end of the second driving motor 11 is connected to an adjusting shaft 111 .

[0047] In this embodiment, the continuous crystallization principle of the continuous crystallization tank 1 is as follows:

[0048] (1) The material is fed into the continuous crystallization tank 1 through the feed pipe 13, and the coolant is circulated in the cooling mechanism;

[0049] (2) After the material enters the continuous crystallization tank 1, it flows in an S-shaped manner in the continuous crystallization tank 1. When passing through the cooling mechanism, it is cooled and crystallized by the cooling mechanism, and the crystal particles condense on the corresponding pipes;

[0050] (3) Then the second driving motor 11 is started to drive the adjusting shaft 111 to rotate continuously, and the adjusting shaft 111 drives the plurality of partition plates 4 to move back and forth through the reciprocating thread, so that the first scraping holes 43 and the second scraping holes 42 on the partition plates 4 can timely scrape off the crystal particles on the corresponding first connecting tube 25 and the second connecting tube 24, and the crystal particles are automatically deposited at the bottom of the continuous crystallization tank 1 due to gravity;

[0051] (4) Then, the first driving motor 3 is started to drive the conveying auger 31 to rotate, thereby utilizing the auger to convey the crystal particles at the bottom of the continuous crystallization tank 1 to the conveying pipe in a timely manner, and then conveyed to the next link through the conveying pipe.

[0052] As a feasible implementation, the first drive motor 3 can be driven by the chain to drive the adjustment shaft 111 to rotate synchronously.

[0053] Example 3

[0054] The same points as Example 2 are not described here. The differences from Example 2 are as follows:

[0055] Reference Figure 5-8 There are multiple guide tubes 27, and the guide tubes 27 are evenly distributed radially outside the inner ring tube 26. Each of the guide tubes 27 is equipped with a scraper ring 291 that can move back and forth to scrape off the crystal particles on the guide tubes 27. The design of the radially even distribution of the guide tubes 27 can ensure that the movement trajectory of the scraper ring 291 is a straight line, ensuring that the back and forth movement of the scraper ring 291 can better scrape off the crystal particles on the guide tubes 27.

[0056] In this embodiment, a rotatable spiral plate 28 is provided on each side of the cooling network pipe. The spiral plate 28 is in a spiral shape, and multiple slidingly connected guide rods 29 are provided inside the spiral plate 28. The ends of the guide rods 29 are fixedly connected to scraper rings 291. The design of the spiral plate 28 and the guide rods 29 enables the multiple guide rods 29 to move outward or inward synchronously with the forward and reverse rotation of the spiral plate 28, thereby achieving back-and-forth movement of the scraper on the guide pipe 27, thereby promptly scraping off crystal particles on the pipe.

[0057] In this embodiment, the middle portion of the spiral plate 28 is fixedly connected to the adjusting shaft 111, and the reciprocating thread on the adjusting shaft 111 is changed to a common thread. Meanwhile, the second driving motor 11 is a motor that can rotate forward and backward.

[0058] In this embodiment, the continuous crystallization principle of the continuous crystallization tank 1 is as follows:

[0059] The second drive motor 11 in Example 2 rotates continuously, but is changed to a second drive motor 11 that rotates forward and backward continuously. This design enables the partition plate 4 to move back and forth through ordinary threads, and also enables the adjusting shaft 111 to drive the spiral plate 28 to rotate forward and reverse, so that the scraper ring 291 can synchronously move back and forth periodically on the guide tube 27, so that the scraper ring 291 can better scrape off the crystal particles on the guide tube 27. This design can effectively scrape off the crystal particles on the pipeline in the continuous crystallization tank 1 in a timely manner, thereby improving the continuous crystallization efficiency and increasing production capacity.

[0060] Example 4

[0061] A continuous crystallization process for sodium bicarbonate comprises the following steps:

[0062] (1) Crystallization of semi-finished products: transport the evaporated water of baking soda into the mother liquor tank through a pump; pump the baking soda solution into the continuous crystallization feed tank with the mother liquor pump; start the stirring of the feed tank and control the feed tank temperature to 40-50℃ through the jacket hot water; start the continuous crystallization feed pump and control the feed flow rate to 2m³ / h through frequency conversion; stop feeding when the feed reaches the overflow port, start the water circulation pump, control the cooling water temperature to 25℃ through the cooling water regulating valve, and control the water flow rate to 10m³ / h through the crystallizer inlet regulating valve; when the outlet temperature drops to 35℃, restart the feed pump and continuously feed at 5m³ / h; at the same time, open the crystallizer inlet regulating valve to maintain the discharge temperature at 35℃; control the discharge buffer tank temperature to be consistent with the crystallizer outlet temperature through the discharge buffer tank inlet regulating valve; analyze the discharge solid content and product quality by centrifugal separation;

[0063] (2) Finished product crystallization: The semi-finished product is used as raw material and put into the mother liquor tank; 40% of the water of the semi-finished product is added to the mother liquor tank and heated to dissolve; when all the crystals are dissolved, they are transported to the crystallizer feed buffer tank through the mother liquor pump; the crystallization operation is carried out in the same way as the semi-finished product crystallization; when a batch of crystallization is completed, the semi-finished product with the same amount of finished product is put into the mother liquor tank, mixed with the centrifuged mother liquor and dissolved, and then returned to the crystallization feed tank, and the operation is repeated.

[0064] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0065] In the present invention, unless otherwise expressly specified or limited, terms such as "disposed," "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0066] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by a person skilled in the art. The provision of power is also common knowledge in the art. The present invention is mainly used to protect mechanical devices, so the control method and circuit connection are not explained in detail in the present invention.

[0067] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A continuous crystallization system for baking soda, characterized by: The invention comprises a continuous crystallization tank (1), wherein one end of the continuous crystallization tank (1) is provided with a feed pipe (13), the other end of the continuous crystallization tank (1) is provided with a discharge pipe (14), and a cooling mechanism for the flow of coolant is provided in the continuous crystallization tank (1), wherein the cooling mechanism comprises a cooling network pipe, the cooling network pipe is annular, a first connecting pipe (25) is provided at the inner ring of one side of the cooling network pipe, and a second connecting pipe (24) is provided at the outer ring of the other side of the cooling network pipe, and adjacent cooling network pipes are communicated with each other through corresponding first connecting pipes (25) and second connecting pipes (24), respectively; a conveying trough (15) is provided at the bottom of the continuous crystallization tank (1), and a conveying mechanism for conveying the crystallized material outward is provided in the conveying trough (15); The cooling network pipe comprises a guide pipe (27), an outer ring pipe (23) and an inner ring pipe (26), wherein the guide pipe (27) is multiple and the guide pipe (27) is arranged between the inner ring pipe (26) and the outer ring pipe (23), the first connecting pipe (25) is in communication with the inner ring pipe (26), and the second connecting pipe (24) is in communication with the outer ring pipe (23); The guide tubes (27) are multiple, and the guide tubes (27) are evenly distributed radially on the outside of the inner ring tube (26), and the guide tubes (27) are provided with scraping rings (291) that can move back and forth to scrape off the crystal particles on the guide tubes (27); The cooling mesh pipes are provided with a partition plate (4) for causing the material to flow in an S-shape in the continuous crystallization tank (1); The partition plate (4) is arranged in the continuous crystallization tank (1) so as to be able to move back and forth periodically. The partition plate (4) is provided with a first scraping hole (43) for scraping off crystal particles on the first connecting tube (25), and the partition plate (4) is also provided with a second scraping hole (42) for scraping off crystal particles on the second connecting tube (24).

2. A sodium bicarbonate continuous crystallization system according to claim 1, characterized in that: The partition plate (4) is slidably and sealedly connected to the inner wall of the continuous crystallization tank (1), wherein a through-type first guide hole (44) is provided on the lower half of one of the partition plates (4), and a through-type second guide hole (41) is provided on the upper half of an adjacent partition plate (4), and the first guide hole (44) and the second guide hole (41) are staggered and distributed on the partition plate (4).

3. The sodium bicarbonate continuous crystallization system according to claim 1, wherein: A rotatable adjustment shaft (111) is provided in the middle of the continuous crystallization tank (1), and the adjustment shaft (111) moves through the center of the partition plate (4). The adjustment shaft (111) is provided with multiple sections of reciprocating threads, and the adjustment shaft (111) and the middle of the partition plate (4) are connected via the reciprocating threads.

4. The sodium bicarbonate continuous crystallization system according to claim 1, wherein: The conveying mechanism includes a conveying auger (31), the continuous crystallization tank (1) is horizontally placed in a cylindrical shape, the feed trough (15) is arranged at the bottom of the continuous crystallization tank (1) for collecting crystal particles, and a rotatable conveying auger (31) is provided in the feed trough (15), and the end of the connecting crystallization tank is provided with a feed pipe connected to the conveying end of the feed trough (15).

5. The sodium bicarbonate continuous crystallization system according to claim 1, characterized in that: A rotatable spiral plate (28) is provided on one side of the cooling network pipe. The spiral plate (28) is vortex-shaped, and a plurality of slidingly connected guide rods (29) are provided inside the spiral plate (28). The ends of the guide rods (29) are fixedly connected to the scraper ring.

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