A pre-ash device for sugar refining production

Abstract

The utility model relates to the technical field of pre-ash technology for sugar refining production, and discloses a pre-ash device for sugar refining production, which comprises a pre-ash pool, four partitions are fixedly installed in the interior of the pre-ash pool, and the interior of the pre-ash pool is evenly divided into five areas by the four partitions. The four partitions evenly divide the pre-ash pool into five areas, and an independent driving motor, a rotating shaft and a stirring fan blade system are arranged in the four areas on the left side, so that the mixing uniformity of lime milk and raw sugar syrup is improved, the pre-ash reaction time is shortened, the part of pigments and impurities in the syrup can be adsorbed after adding lime, the cleaning efficiency is improved, the lime milk feeding pipe is connected with a double first electric regulating valve and a first flowmeter to realize independent flow regulation and control of the first area and the fourth area, the rightmost area is monitored in real time by a PH automatic measuring instrument, the lime milk feeding amount can be dynamically adjusted, the pre-ash end point pH value reaches the standard, the PH value of the raw sugar solution is controlled, the sucrose conversion is effectively reduced, and the cleaning efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of pre-ashing technology for sugar refining production, specifically a pre-ashing device for sugar refining production. Background Technology

[0002] Currently, pre-ashing technology is widely used in sugarcane sugar factories in China, and its role and effect have been affirmed. However, the application of pre-ashing technology in sugar refining plants is still basically blank. The pH value of the raw sugar solution produced by sugar refining is low, around 6. Lime milk is added only during the saturation process, and the time from raw sugar dissolving to saturation is about 2 hours. Under acidic conditions, sucrose is easily converted into reducing sugar, and bacteria easily grow under acidic conditions, accelerating the conversion of sucrose. Without pre-ashing, sucrose is easily converted, resulting in sugar loss. The conversion of sucrose into reducing sugar has high viscosity, which greatly increases the difficulty of the subsequent sugar boiling, crystallization, and separation processes, increases the sugar carried away by the molasses, and the conversion of sucrose will cause the raw sugar solution to become discolored, affecting product quality. Therefore, we propose a pre-ashing device for sugar refining production to solve the above problems. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model provides a pre-ashing device for sugar refining production, thereby solving the problems mentioned in the background section.

[0004] This utility model provides the following technical solution: a pre-ashing device for sugar refining production, including a pre-ashing tank. Four partitions are fixedly installed inside the pre-ashing tank, dividing its interior into five equal regions. An mounting plate is fixedly installed in the center of the top surface of the pre-ashing tank. Multiple drive motors are evenly installed on the top surface of the mounting plate. A rotating shaft is installed at the output end of each drive motor, and multiple stirring blades are installed around the outer ring of the rotating shaft. A lime slurry feeding pipe is located on the upper left side of the pre-ashing tank. The two output ends of the lime slurry feeding pipe are located in the first and fourth regions from the left side of the pre-ashing tank, respectively. A second water pump is fixedly installed on the lower part of the right sidewall of the pre-ashing tank. The input end of the second water pump penetrates and extends to the lower part of the rightmost region of the pre-ashing tank, and a return circulation pipe is installed at the outlet end of the second water pump, penetrating and extending to the leftmost region of the pre-ashing tank.

[0005] As a preferred embodiment of this utility model, there are four drive motors, which are respectively installed directly above the four areas on the left side of the pre-ash pool.

[0006] As a preferred technical solution of this utility model, the rotating shaft installed at the output end of the drive motor passes through the mounting plate and extends into the four areas on the left side of the pre-ash tank. The upper, middle and lower parts of the outer ring of the rotating shaft are all equipped with sleeves. There are multiple stirring blades, which are evenly installed on the outer ring of the sleeves.

[0007] As a preferred embodiment of this utility model, a lime slurry feeding main pipe is installed on the right side of the lime slurry feeding branch pipe, and the other end of the lime slurry feeding main pipe is connected to the lime slurry container.

[0008] As a preferred embodiment of this utility model, a first electric regulating valve is installed on both sides of the lime slurry feeding branch pipe and on both sides of the lime slurry feeding main pipe, and a first flow meter is also installed on the lime slurry feeding branch pipe.

[0009] As a preferred embodiment of this utility model, a second flow meter is installed on the reflux circulation pipe, a drain pipe is installed on the lower part of the side wall of the pre-ash tank, and an automatic pH measuring instrument is fixedly installed on the top surface of the mounting plate located in the rightmost area of ​​the pre-ash tank, with the sensor of the automatic pH measuring instrument located in the rightmost area of ​​the pre-ash tank.

[0010] As a preferred technical solution of this utility model, four first water pumps are installed on the left side of the top surface of the mounting plate, and the input end of the first water pump is equipped with an inlet pipe, and the output end of the first water pump is equipped with an outlet pipe, and the inlet pipe and outlet pipe are respectively located in the area separated by two adjacent pre-ash tanks.

[0011] As a preferred embodiment of this utility model, a hot water pipe and a raw sugar feeding pipe are also installed in the leftmost area of ​​the pre-ash tank, and the other end of the raw sugar feeding pipe is connected to a raw sugar container with a weighing structure.

[0012] As a preferred embodiment of this utility model, multiple support plates are evenly installed at the bottom of the pre-ash tank, and sewage pipes are installed at the bottom of each of the five areas of the pre-ash tank, with solenoid valves installed on the sewage pipes.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This pre-ashing device for sugar refining production divides the pre-ashing tank into five zones evenly by four partitions. Each of the four zones on the left is equipped with an independent drive motor, rotating shaft, and stirring blade system, forming a multi-level zoned stirring structure. This design allows for differentiated adjustment of stirring intensity based on the material characteristics of each zone, avoiding the mixing dead zones inherent in traditional single-zone stirring. Simultaneously, the three-section sleeve layout on the outer ring of the rotating shaft creates a three-dimensional stirring flow field in the vertical direction, significantly improving the mixing uniformity of lime milk and raw sugar syrup, shortening the pre-ashing reaction time. Furthermore, the addition of lime can adsorb some of the pigments and impurities in the syrup, improving cleaning efficiency.

[0015] 2. This pre-ashing device for sugar refining production features a lime slurry feeding pipe with dual first electric regulating valves and a first flow meter to achieve independent flow control in the first and fourth zones. Combined with a pH automatic measuring instrument for real-time monitoring of the pH value in the rightmost zone, the lime slurry feeding amount can be dynamically adjusted to ensure that the pH value at the pre-ashing endpoint meets the standard, controlling the pH value of the raw sugar dissolving solution, effectively reducing sucrose conversion, and improving cleaning efficiency. The return circulation pipe, in conjunction with a second water pump and a second flow meter, realizes the circulation of the pre-ashing liquid, which not only enhances the material exchange between zones but also forms a gradient concentration difference through the liquid transfer function between adjacent zones driven by the first water pump, promoting the stability of the reaction process. In addition, the solenoid valve of the bottom drain pipe works in conjunction with the weighing structure of the hot water pipe and the raw sugar feeding pipe to achieve automated control of equipment cleaning and raw material feeding, significantly reducing human operation errors and improving production continuity. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a schematic cross-sectional view of the pre-ash tank of this utility model;

[0018] Figure 3 This is a schematic diagram of the stirring fan blade structure of this utility model.

[0019] In the diagram: 1. Pre-ash tank; 2. Sewage pipe; 3. Return circulation pipe; 4. Support plate; 5. Water inlet pipe; 6. First water pump; 7. Drive motor; 8. Hot water pipe; 9. Raw sugar feeding pipe; 10. Lime milk feeding branch pipe; 11. First electric regulating valve; 12. First flow meter; 13. Lime milk feeding main pipe; 14. Water outlet pipe; 15. Automatic pH meter; 16. Mounting plate; 17. Drainage pipe; 18. Second water pump; 19. Second flow meter; 20. Baffle plate; 21. Sleeve; 22. Rotating shaft; 23. Stirring fan blade. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1: Please refer to Figure 1 , Figure 2 and Figure 3A pre-ashing device for sugar refining includes a pre-ashing tank 1, which is internally divided into five areas by four partitions 20. A mounting plate 16 is fixed to the top of the pre-ashing tank 1, on which four drive motors 7 are symmetrically arranged, corresponding to the four areas on the left. The rotating shafts 22 of the drive motors 7 pass through the mounting plate 16 to the corresponding areas. Three sleeves 21 are installed on each shaft 22, and multiple stirring blades 23 are evenly distributed around the outer ring of each sleeve 21, such as three to six, forming a multi-stage stirring structure. A lime slurry feeding branch pipe 10 controls the flow rate through a first electric regulating valve 11 and a first flow meter 12, with its two output ends connected to the first and fourth areas respectively. A lime slurry feeding main pipe 13 connects to a lime slurry container. A second water pump 1 is installed on the lower right side of the pre-ashing tank 1. 8. Its output end is connected to the first area through the return circulation pipe 3. A second flow meter 19 is installed on the return circulation pipe 3. A drain pipe 17 is installed at the bottom of the rightmost area of ​​the pre-ash tank 1. It can be connected to the next process for processing through a water pump. If it is saturated, it will be treated again with carbonic acid. A pH automatic measuring instrument 15 is installed on the top mounting plate 16. Its sensor extends below the liquid surface in this area. Four first water pumps 6 are installed on the left side of the mounting plate 16. Their inlet pipes 5 and outlet pipes 14 are respectively connected to the adjacent areas to form a liquid flow channel between areas. A hot water pipe 8 and a raw sugar feeding pipe 9 are installed in the leftmost area of ​​the pre-ash tank 1. The latter is connected to a raw sugar container with weighing function. Multiple support plates 4 are installed at the bottom. Each area is equipped with a drain pipe 2 with a solenoid valve at the bottom.

[0022] Example 2: Please refer to Figure 1 , Figure 2 and Figure 3 The lime slurry feeding system is optimized. The lime slurry feeding branch pipe 10 adopts a dual-branch design, with each branch equipped with an independent first electric regulating valve 11 and a first flow meter 12 to achieve differentiated feeding control between the first and fourth zones. A second water pump 18 with variable frequency control is added to the return circulation pipe 3. Combined with the real-time monitoring data of the second flow meter 19, the return flow rate is dynamically adjusted through the PLC system to make the liquid circulation speed in the pre-ash tank 1 synergistic with the stirring speed. A liquid level sensor (not shown in the figure) is added to the mounting plate 16 and linked with the first water pump 6. When the liquid level is lower than the set value, the inlet pipe 5 is automatically closed and the drainage operation of the drain pipe 17 is triggered. A screw propeller (not shown in the figure) is installed at the end of the raw sugar feeding pipe 9. Together with the weighing container, it realizes accurate metering and continuous addition of raw sugar. At the same time, after adding lime, it can adsorb some of the pigments and impurities of the syrup, improving the cleaning efficiency.

[0023] Example 3: Please refer to Figure 1 , Figure 2 and Figure 3This embodiment adopts a five-zone independent control architecture. Each zone is equipped with an independent drive motor 7 and a stirring system. The number of sleeves 21 of the rotating shaft 22 is adjusted according to the zone volume, such as four in the first zone and three in the other zones. The lime slurry feeding branch pipe 10 is equipped with a three-way solenoid valve (not shown in the figure) at the lime slurry feeding main pipe 13, which can switch to feeding the first zone, the fourth zone, or both simultaneously. The return circulation pipe 3 branches into five branches inside the pre-ash tank 1. Each branch corresponds to a zone and is equipped with a shut-off valve to achieve directional return. The pH automatic measuring instrument 15 is upgraded to a multi-probe structure, with detection points arranged in the first, third, and fifth zones respectively. The data is transmitted to the central control system through a wireless module. The sewage pipe 2 of each zone is equipped with a backwashing interface, and the periodic self-cleaning function is achieved by switching the solenoid valve.

[0024] Implementation Results: The pre-ash tank 1 is evenly divided into five areas by four partitions 20, and an independent drive motor 7, rotating shaft 22 and stirring blade 23 system are set for the four areas on the left, forming a multi-level zoned stirring structure. This design can adjust the stirring intensity according to the material characteristics of each area, avoiding the mixing dead corners of traditional single-area stirring. At the same time, through the three-section sleeve 21 layout of the outer ring of the rotating shaft 22, the stirring blade 23 forms a three-dimensional stirring flow field in the vertical direction, which significantly improves the mixing uniformity of lime milk and raw syrup, shortens the pre-ash reaction time, and after adding lime, it can adsorb some of the pigments and impurities of the syrup, improving the cleaning efficiency.

[0025] The lime slurry feeding pipe 10 achieves independent flow control of the first and fourth zones through dual first electric regulating valves 11 and first flow meter 12. Combined with the real-time monitoring of the pH value of the rightmost zone by the automatic pH measuring instrument 15, the amount of lime slurry fed can be dynamically adjusted to ensure that the pH value at the pre-ashing endpoint meets the standard, control the pH value of the raw sugar dissolving solution, effectively reduce sucrose conversion, and improve cleaning efficiency. The return circulation pipe 3, together with the second water pump 18 and the second flow meter 19, realizes the circulation of the pre-ashing liquid, which not only strengthens the material exchange between zones, but also forms a gradient concentration difference through the liquid transfer function between adjacent zones driven by the first water pump 6, promoting the stability of the reaction process. In addition, the solenoid valve of the bottom drain pipe 2 works in conjunction with the weighing structure of the hot water pipe 8 and the raw sugar feeding pipe 9 to realize the automated control of equipment cleaning and raw material feeding, significantly reducing human operation errors and improving production continuity.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pre-ashing device for sugar refining production, comprising a pre-ashing tank (1), characterized in that: The pre-ash tank (1) is fixedly equipped with four partitions (20), which divide the interior of the pre-ash tank (1) into five areas. A mounting plate (16) is fixedly installed in the middle of the top surface of the pre-ash tank (1). Multiple drive motors (7) are evenly installed on the top surface of the mounting plate (16). A rotating shaft (22) is installed at the output end of the drive motor (7). Multiple stirring blades (23) are installed on the outer ring of the rotating shaft (22). The upper left side of the pre-ash tank (1) A lime slurry feeding branch pipe (10) is provided. The two output ends of the lime slurry feeding branch pipe (10) are located in the first and fourth regions from the left side of the pre-ash tank (1), respectively. A second water pump (18) is fixedly installed on the lower part of the right side wall of the pre-ash tank (1). The input end of the second water pump (18) extends through and to the lower part of the rightmost region of the pre-ash tank (1). The outlet end of the second water pump (18) is equipped with a return circulation pipe (3) that extends through and to the leftmost region of the pre-ash tank (1).

2. The pre-ashing device for sugar refining production according to claim 1, characterized in that: There are four drive motors (7), which are installed directly above the four areas on the left side of the pre-ash pool (1).

3. The pre-ashing device for sugar refining production according to claim 1, characterized in that: The shaft (22) installed at the output end of the drive motor (7) passes through the mounting plate (16) and extends into the four areas on the left side of the pre-ash tank (1). The upper, middle and lower parts of the outer ring of the shaft (22) are all equipped with sleeves (21). There are multiple stirring blades (23), which are evenly installed on the outer ring of the sleeves (21).

4. The pre-ashing device for sugar refining production according to claim 1, characterized in that: The lime slurry feeding branch pipe (10) is equipped with a lime slurry feeding main pipe (13) on the right side, and the other end of the lime slurry feeding main pipe (13) is connected to the lime slurry container.

5. A pre-ashing device for sugar refining production according to claim 1, characterized in that: A first electric regulating valve (11) is installed on both sides of the lime slurry feeding branch pipe (10) and the lime slurry feeding main pipe (13). A first flow meter (12) is also installed on the lime slurry feeding branch pipe (10).

6. The pre-ashing device for sugar refining production according to claim 1, characterized in that: A second flow meter (19) is installed on the return circulation pipe (3), a drain pipe (17) is installed on the lower part of the side wall of the pre-ash tank (1), and an automatic pH measuring instrument (15) is fixedly installed on the top surface of the mounting plate (16) located in the rightmost area of ​​the pre-ash tank (1), and the sensor of the automatic pH measuring instrument (15) is located in the rightmost area of ​​the pre-ash tank (1).

7. A pre-ashing device for sugar refining production according to claim 1, characterized in that: Four first water pumps (6) are installed on the left side of the top surface of the mounting plate (16), and the input end of the first water pump (6) is equipped with an inlet pipe (5), and the output end of the first water pump (6) is equipped with an outlet pipe (14). The inlet pipe (5) and the outlet pipe (14) are respectively located in the areas separated by two adjacent pre-ash pools (1).

8. A pre-ashing device for sugar refining production according to claim 1, characterized in that: The leftmost area of ​​the pre-ash tank (1) is also equipped with a hot water pipe (8) and a raw sugar feeding pipe (9), and the other end of the raw sugar feeding pipe (9) is connected to a raw sugar container with a weighing structure.

9. A pre-ashing device for sugar refining production according to claim 1, characterized in that: The bottom of the pre-ash tank (1) is evenly equipped with multiple support plates (4), and the lower part of each of the five areas of the pre-ash tank (1) is equipped with a sewage pipe (2), and a solenoid valve is installed on the sewage pipe (2).

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