Crystallizer with cleaning function for preparing l-aspartic acid

Abstract

The utility model provides a kind of for preparing L-aspartic acid with the crystallizer of cleaning function, including crystallization kettle main part, located the feed channel of crystallization kettle main part top and be set to the crystallization chamber of crystallization kettle main part bottom wall, still include support frame, set on the drive mechanism and cleaning plate of support frame, support frame is located the top of crystallization chamber and is connected with the inner wall of crystallization kettle main part, drive mechanism is connected with cleaning plate and is used to drive cleaning plate rotation, the side wall of cleaning plate and the inner wall of crystallization kettle main part abuts, support frame supports drive mechanism and support plate, the side wall of cleaning plate and the inner side wall of crystallization kettle main part abuts, when crystallization chamber top scale, through the drive mechanism on support frame, cleaning plate slowly rotates, to scrape off the scale on the side wall of crystallization kettle main part, to reduce the scale on the inner side wall of crystallization kettle main part, so that scale is not easy to destroy the growth environment of crystal, improve the processing quality of ammonium sulfate product.

Description

Technical Field

[0001] This invention belongs to the technical field of crystallizers, and in particular, relates to a crystallizer with a cleaning function for preparing L-aspartic acid. Background Technology

[0002] In the production of L-aspartic acid using raw materials such as wet fumarate and magnesium sulfate, the raw materials are first stirred and then flushed with liquid nitrogen to form an ammonium fumarate solution. Workers then ferment, centrifuge, and fix a designated bacterial strain to form solidified gel beads. These beads, along with the ammonium fumarate solution, are transferred to a conversion tank for further processing. After decolorization, filtration, and isoelectric point crystallization, a mixed solution of L-aspartic acid and ammonium sulfate is formed. By adjusting the pH, L-aspartic acid crystallizes out, leaving a residual ammonium sulfate solution. The precipitated L-aspartic acid is then filtered, washed, and dried to obtain the finished L-aspartic acid product. The remaining ammonium sulfate solution is then subjected to quadruple-effect evaporation and separation to obtain solid ammonium sulfate as a byproduct.

[0003] The shortcomings of existing technology: In the process of producing L-aspartic acid, the byproduct ammonium sulfate crystals are usually produced in a conventional stirred crystallizer. However, the conventional stirred crystallizer generates strong shear forces during operation, which can easily break the normally growing crystals. At the same time, it is not easy to achieve uniform supersaturation, temperature and hydrodynamic environment in a conventional stirred crystallizer, resulting in poor crystal growth conditions, wide particle size distribution and many fine crystals, which in turn affects the quality of ammonium sulfate.

[0004] Typically, workers replace ordinary stirred crystallizers with Oslo crystallizers to crystallize ammonium sulfate in the crystallization chambers of the Oslo crystallizer, thus obtaining large-particle ammonium sulfate. However, when the ammonium sulfate solution comes into contact with the inner wall of the Oslo crystallizer, because the ammonium sulfate solution is supersaturated and its temperature is much higher than the temperature of the inner wall of the Oslo crystallizer, the ammonium sulfate solution crystallizes and precipitates rapidly when it comes into contact with the side wall above the crystallization chamber of the Oslo crystallizer, thus forming hard scale. This disrupts the stable crystal growth environment, resulting in smaller and more uneven particle size of the produced ammonium sulfate crystals, thereby reducing the quality of ammonium sulfate. Utility Model Content

[0005] Based on the aforementioned problems in the prior art, one of the objectives of this utility model is to provide a crystallizer with a cleaning function for preparing L-aspartic acid, so as to solve the problem that scaling in the Oslo crystallizer affects the processing quality of ammonium sulfate in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a crystallizer with a cleaning function for preparing L-aspartic acid is provided, including a crystallization vessel body, a feed channel located at the top of the crystallization vessel body and a crystallization chamber disposed on the bottom wall of the crystallization vessel body, and further including a support frame, a drive mechanism disposed on the support frame and a cleaning plate. The support frame is located at the top of the crystallization chamber and is connected to the inner wall of the crystallization vessel body. The drive mechanism is connected to the cleaning plate and is used to drive the cleaning plate to rotate. The side wall of the cleaning plate abuts against the inner wall of the crystallization vessel body.

[0007] Furthermore, the driving mechanism includes a driving source, a rotating shaft, several rotating rods, and a contacting member. The driving source is mounted on a support frame and is connected to the rotating shaft for driving the rotating shaft to rotate. The rotating shaft is rotatably mounted on the support frame. The several rotating rods are distributed circumferentially along the rotating shaft. The top and bottom of each rotating shaft are connected, and the bottom of each rotating shaft is connected to a cleaning plate. The contacting member is located at the bottom of the support frame and is connected to the several rotating rods for abutting against the rotating rods.

[0008] Furthermore, the abutment member includes an abutment spring, the two ends of which are respectively connected to the side wall of the rotating rod.

[0009] Furthermore, the drive source includes a drive impeller located below the feed channel. The drive impeller is rotatably mounted on the support frame and fixedly sleeved on the rotating shaft. The drive impeller is used to contact the raw material in the feed channel.

[0010] Furthermore, the support frame is provided with multiple inlet holes through which the solution can pass, and the multiple inlet holes are evenly distributed along the circumference of the rotating shaft.

[0011] Furthermore, a flow guide hood is provided on the top of the support frame. The flow guide hood is funnel-shaped and covers the drive impeller. There is a gap between the inner wall of the flow guide hood and the drive impeller.

[0012] Compared with the prior art, one or more technical solutions in the embodiments of this utility model have at least one of the following beneficial effects: In this embodiment of the invention, a crystallizer with a cleaning function is used to prepare L-aspartic acid. The support frame supports the drive mechanism and the support plate. The side wall of the cleaning plate abuts against the inner wall of the crystallizer body. When scale forms on the inner wall of the crystallizer body, the cleaning plate slowly rotates through the drive mechanism on the support frame to scrape off the scale above the crystallization chamber, thereby reducing scale on the inner wall of the crystallizer body. This makes it less likely for scale to damage the crystal growth environment and improves the processing quality of the ammonium sulfate product. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of the crystallizer provided in an embodiment of the present invention; Figure 2 for Figure 1 The diagram shows a partial explosion of the crystallizer. Figure 3 for Figure 2 The diagram shows a partial structural schematic of the crystallizer. Figure 4 for Figure 3 The diagram shows the exploded structure. Figure 5 for Figure 1 The diagram shows a cross-sectional view of the crystallizer.

[0015] The following are the labeling elements in the figure: 1. Crystallization vessel body; 11. Feed channel; 12. Circulation channel; 13. Discharge channel; 14. Crystallization chamber; 21. Support frame; 22. Cleaning plate; 23. Liquid inlet; 3. Drive mechanism; 31. Drive source; 32. Rotating shaft; 33. Rotating rod; 34. Abutment component; 4. Drainage cover; 5. Bearings. Detailed Implementation

[0016] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] It should be noted that when a component is referred to as "connected to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0019] In the description of this utility model, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] Throughout this specification, reference to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, a particular feature, structure, or characteristic may be combined in any suitable manner.

[0022] Please refer to the following: Figures 1 to 5The crystallizer provided by the present invention will now be described. The crystallizer of the present invention includes a crystallization vessel body 1, a feed channel 11, a circulation channel 12, a discharge channel 13, and a crystallization chamber 14. The feed channel 11 is located at the top of the crystallization vessel body 1, and the bottom of the feed channel 11 is connected to the circulation channel 12. The circulation channel 12 is located on one side of the crystallization vessel body 1 and is connected to the crystallization vessel body 1. The discharge channel 13 is located on the other side of the crystallization vessel body 1 and is connected to the crystallization vessel body 1. The crystallization chamber 14 is located on the bottom wall of the crystallization vessel body 1.

[0023] A crystallizer also includes a cleaning device located inside the crystallization vessel body 1. The cleaning device includes a support frame 21, a flow guide hood 4, a drive mechanism 3, and a cleaning plate 22. The horizontally arranged support frame 21 is fixed to the inner wall of the crystallization vessel body 1, and the support frame 21 has multiple inlet holes 23 for the solution to pass through. The vertically arranged flow guide hood 4 is funnel-shaped, and the bottom of the flow guide hood 4 is fixed to the top of the support frame 21. The drive mechanism 3 includes a drive source 31, a rotating shaft 32, several rotating rods 33, and abutment members 34. In this embodiment, the drive source 31 includes a drive impeller rotatably mounted on the support frame 21. The drive impeller is located inside the flow guide hood 4, and there is a gap between the blades of the drive impeller and the inner sidewall of the flow guide hood 4. The blades of the drive impeller have an airfoil-shaped cross section. The drive impeller is made of wear-resistant high-chromium white cast iron material. The drive impeller contacts the solution at the port of the circulation channel 12, and the drive impeller rotates due to the impact of the solution on the drive impeller. The top of the vertically mounted rotating shaft 32 is fixedly connected to the impeller on the same axis. The side wall of the rotating shaft 32 is rotatably connected to the support frame 21 through the bearing 5, thereby reducing the wear between the rotating shaft 32 and the support frame 21 and making the rotating shaft 32 easier to rotate. The bottom of the rotating shaft 32 is hinged to the top of the rotating rod 33. In this embodiment, there are two rotating rods 33, which are evenly distributed around the circumference of the rotating shaft 32. Each rotating rod 33 is inclined, and the bottom of each rotating rod 33 is fixed to the top of the cleaning plate 22. In this embodiment, the abutting member 34 includes an abutting spring, and the two ends of the abutting spring are respectively fixed to the side walls of the two rotating rods 33. The cleaning plate 22 is located above the crystallization chamber 14, and the side wall of the cleaning plate 22 is used to abut against the inner side wall of the crystallization vessel body 1, thereby scraping off the scale on the inner wall of the crystallization vessel body 1. Through the elastic potential energy of the abutting spring, the two rotating rods 33 move in a direction away from each other until the side wall of the cleaning plate 22 is always in contact with the inner wall of the crystallization vessel body 1. At the same time, the cleaning plate 22 is made of flexible polytetrafluoroethylene material. Polytetrafluoroethylene material has a certain elasticity, which can scrape off the scale layer without rigidly colliding with the inner wall of the Oslo crystallizer, and reduces the shear force on the crystal, thereby reducing the interference and damage to the crystal growth.

[0024] When the solution in the circulation channel 12 moves into the crystallization vessel body 1, it moves from the circulation channel 12 into the guide hood 4, and then through the liquid inlet 23 on the support frame 21, it comes into contact with the inner wall above the crystallization chamber 14 in the Oslo crystallizer, thus easily recrystallizing the inner wall structure above the crystallization chamber 14. At this time, due to the impact of the solution on the drive impeller in the guide hood 4, the drive impeller rotates, thereby driving the rotating shaft 32 to rotate synchronously, which in turn drives the rotating rod 33 and the cleaning plate 22 to rotate synchronously. The cleaning plate 22 is used to scrape off the scale on the inner wall of the crystallization vessel body 1. At the same time, the drive impeller drives the cleaning plate 22 to clean slowly, thereby reducing the large shear force that the cleaning plate 22 can generate, and making it less likely to damage the formation of ammonium sulfate crystals. In addition, by using a flexible and low-speed cleaning method, the shear force damage to the crystals is minimized, thus solving the scaling problem without compromising the core advantage of the Oslo crystallizer in producing large-particle crystals, and improving the crystallization quality of ammonium sulfate.

[0025] The working principle of this utility model is as follows: When scale forms above the crystallization chamber 14, the solution moves through the circulation channel 12 into the flow hood 4 and is then transferred into the crystallization chamber 14 through the inlet hole 23 on the support plate. During this process, the impeller inside the flow hood 4 is easily impacted, causing it to rotate. This, in turn, drives the rotating shaft 32 to rotate synchronously. The bearing 5 reduces the friction between the rotating shaft 32 and the support frame 21, making it easier for the shaft 32 to rotate. The rotation of the shaft 32 then drives the rotating rod 33 and the cleaning plate 22 to rotate synchronously. The cleaning plate 22 slowly scrapes away the scale above the crystallization chamber 14, reducing the scale on the inner wall of the crystallization vessel body 1. This reduces the interference of scale on the formation of ammonium sulfate crystals and improves the processing quality of ammonium sulfate crystals. At the same time, the impact of the solution drives the impeller to rotate, causing the rotating shaft 32 to rotate slowly, thereby reducing interference with crystal growth and further improving the processing quality of the crystals.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A crystallizer with a cleaning function for preparing L-aspartic acid, comprising a crystallization vessel body (1), a feed channel (11) located at the top of the crystallization vessel body (1), and a crystallization chamber (14) disposed on the bottom wall of the crystallization vessel body (1), characterized in that, It also includes a support frame (21), a drive mechanism (3) mounted on the support frame (21), and a cleaning plate (22). The support frame (21) is located at the top of the crystallization chamber (14) and is connected to the inner wall of the crystallization vessel body (1). The drive mechanism (3) is connected to the cleaning plate (22) and is used to drive the cleaning plate (22) to rotate. The side wall of the cleaning plate (22) abuts against the inner wall of the crystallization vessel body (1).

2. A crystallizer with a cleaning function for preparing L-aspartic acid as described in claim 1, characterized in that, The drive mechanism (3) includes a drive source (31), a rotating shaft (32), a plurality of rotating rods (33) and an abutment (34). The drive source (31) is mounted on a support frame (21). The drive source (31) is connected to the rotating shaft (32) and is used to drive the rotating shaft (32) to rotate. The rotating shaft (32) is rotatably mounted on the support frame (21). A plurality of rotating rods (33) are distributed circumferentially along the rotating shaft (32). The top of each rotating shaft (32) is connected to the bottom of the rotating shaft (32). The bottom of each rotating shaft (32) is connected to the cleaning plate (22). The abutment (34) is located at the bottom of the support frame (21). The abutment (34) is connected to a plurality of rotating rods (33) and is used to abut against the rotating rods (33).

3. A crystallizer with a cleaning function for preparing L-aspartic acid as described in claim 2, characterized in that, The abutment member (34) includes an abutment spring, the two ends of which are respectively connected to the side wall of the rotating rod (33).

4. A crystallizer with a cleaning function for preparing L-aspartic acid as described in claim 2, characterized in that, The drive source (31) includes a drive impeller located below the feed channel (11). The drive impeller is rotatably mounted on the support frame (21) and fixedly mounted on the rotating shaft (32). The drive impeller is used to contact the raw material in the feed channel (11).

5. A crystallizer with a cleaning function for preparing L-aspartic acid as described in claim 2, characterized in that, The support frame (21) has multiple inlet holes (23) through which the solution can pass, and the multiple inlet holes (23) are evenly distributed along the circumference of the rotating shaft (32).

6. A crystallizer with a cleaning function for preparing L-aspartic acid as described in claim 4, characterized in that, The top of the support frame (21) is provided with a flow guide (4), which is funnel-shaped and covers the drive impeller. There is a gap between the inner wall of the flow guide (4) and the drive impeller.

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