A continuous urea extraction purification device

Abstract

This utility model discloses a continuous urea extraction and purification device, relating to the field of urea extraction and purification technology. The utility model includes an extraction tower, with a lower separation section and an upper separation section at the bottom and top. A first drain port is installed on the lower separation section, and a second drain port is installed on the upper separation section. A raw material inlet and an extract inlet are respectively installed on the left side of the extraction tower. It also includes a reciprocating section installed at the top of the upper separation section and a mixing section installed inside the extraction tower. By setting up a mixing section, specifically, two phases come into countercurrent contact and mix within the extraction tower. The up-and-down reciprocating motion of the fixed disk and blades increases the shearing effect between the two phases, allowing for more thorough mixing. Furthermore, the sieve plate further enhances the shearing effect, not only ensuring thorough mixing of the two phases but also improving mass transfer efficiency. This method also improves the purification quality.

Description

Technical Field

[0001] This utility model belongs to the field of urea extraction and purification technology, and in particular relates to a continuous urea extraction and purification device. Background Technology

[0002] Continuous urea extraction and purification equipment is one of the core technologies for achieving efficient separation and purification in modern chemical production. Its design needs to take into account the characteristics of urea (such as easy crystallization and high polarity) and process requirements.

[0003] Traditional urea extraction and purification equipment typically uses a countercurrent continuous extraction tower to complete the mass transfer process. When mixing the raw material liquid and the extract, a sieve plate is usually used to mix the two. This method results in insufficient shearing of the liquid, leading to poor mixing effect and difficulty in fully mixing the liquid, thus affecting the purification effect of urea. Utility Model Content

[0004] The purpose of this invention is to provide a continuous urea extraction and purification device. By setting up a mixing section, specifically, the two phases come into countercurrent contact and mix in the extraction tower. The up-and-down reciprocating motion of the fixed disk and blades can increase the shearing effect of the two phases, making the two phases more fully mixed. In addition, the sieve plate further enhances the shearing effect, which not only makes the two phases more fully mixed again, but also improves the mass transfer efficiency. This method can improve the purification quality and solves the problem that when mixing the raw material liquid and the extract liquid, the sieve plate is usually used to mix the two, which leads to insufficient shearing of the liquid and poor mixing effect.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model relates to a continuous urea extraction and purification device, comprising an extraction tower. The bottom and top of the extraction tower have a lower separation section and an upper separation section. A first drain port is installed on the lower separation section, and a second drain port is installed on the upper separation section. A raw material inlet and an extract inlet are respectively installed on the left side of the extraction tower. The device also includes:

[0007] A reciprocating section, installed at the top of the upper separation section, is used to reciprocate the feed liquid and extract liquid inside the extraction tower; and

[0008] A mixing section is installed inside the extraction tower, and a reciprocating section is used to provide reciprocating power to the mixing section, so that the mixing section fully mixes the two phases in the extraction tower;

[0009] The raw material inlet is used to add urea raw material solution, and the extract inlet is used to add extract solution.

[0010] Furthermore, perforated plates are installed on the inner sides of both the lower and upper separation sections. The feed liquid inlet is located at the top of the extraction tower, and the extract liquid inlet is located at the bottom of the extraction tower. The two phases after mixing are separated into layers due to density differences.

[0011] Furthermore, the mixing section includes a rotating rod disposed inside the extraction tower, a fixed disk is fixedly connected to the outer surface of the rotating rod, a plurality of blades are fixedly connected to the outer side of the fixed disk, a stabilizing outer rod is slidably connected to the bottom of the rotating rod, and a plurality of sieve plates are fixedly connected to the inner wall of the extraction tower;

[0012] The rotating rod is used to drive the fixed disk and blades to move up and down reciprocally, and the stabilizing outer rod is used to maintain the stability of the rotating rod.

[0013] Furthermore, the bottom of the stabilizing outer rod is fixedly connected to the inner wall of the lower separation section, and the screen plate has several openings inside, which are adapted to the blades, and the blades pass through the openings when they move.

[0014] Furthermore, the reciprocating section includes a baffle fixedly connected to the top of the upper separating section, and a support plate fixedly connected to the inner side of the baffle; and

[0015] A push assembly, which is installed inside the retaining housing, is used to provide thrust to the rotating rod;

[0016] A motor is fixedly connected to the left side of the support plate, and a bevel gear is fixedly connected to the output end of the motor.

[0017] Furthermore, the pushing assembly includes a lower inclined ring fixedly connected to the top of the rotating rod, a convex ring fixedly connected to the outside of the lower inclined ring, three limiting rods slidably connected inside the convex ring on the outside of the lower inclined ring, a spring fixedly connected to the bottom of the lower inclined ring, an upper inclined ring contacting the top of the lower inclined ring, a rotating shaft fixedly connected to the top of the upper inclined ring, and a bevel gear two fixedly connected to the top of the rotating shaft.

[0018] The first bevel gear is meshed with the second bevel gear, and the rotating shaft is rotatably connected to the central shaft inside the retaining housing. When the first bevel gear rotates, it drives the upper inclined ring to rotate through the second bevel gear and the rotating shaft.

[0019] Furthermore, the bottom of the limiting rod is fixedly connected to the top of the upper separating section, and the bottom of the spring is fixedly connected to the top of the upper separating section. The limiting rod is used to limit the movement of the lower inclined ring. When the lower inclined ring is pushed downward, it will compress the spring, which makes it easier to push the lower inclined ring upward and reset it through the elastic force later.

[0020] This utility model has the following beneficial effects:

[0021] 1. This utility model, by setting up a mixing section, specifically, allows two phases to come into countercurrent contact and mix in the extraction tower. The up-and-down reciprocating motion of the fixed disk and blades can increase the shearing effect of the two phases, making the two phases more fully mixed. In addition, the sieve plate further enhances the shearing effect, which not only makes the two phases more fully mixed again, but also improves the mass transfer efficiency. Furthermore, this method can improve the purification quality.

[0022] 2. This utility model, by setting a pushing component, specifically, when the upper inclined ring rotates, after the protruding position moves to the protruding position of the lower inclined ring, it will push the lower inclined ring downward. At this time, the spring is compressed. Subsequently, after the protruding position of the upper inclined ring leaves the protruding position of the lower inclined ring, the lower inclined ring will return to its original position upward through the elasticity of the spring. This process is repeated to make the rotating rod move up and down stably, ensuring the mixing effect of the two phases.

[0023] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments 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.

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a front view cross-sectional structural diagram of the extraction tower of this utility model;

[0027] Figure 3 This is a front view cross-sectional structural diagram of the baffle shell of this utility model;

[0028] Figure 4 This is a schematic diagram of the overall structure of the sieve plate of this utility model.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Extraction tower; 11. Lower separation section; 111. Drain port one; 112. Drain port two; 12. Upper separation section; 13. Raw material inlet; 14. Extract inlet; 15. Perforated plate; 2. Reciprocating section; 21. Baffle; 22. Support plate; 221. Motor; 222. Bevel gear one; 23. Pushing assembly; 231. Lower inclined ring; 232. Limiting rod; 233. Spring; 234. Upper inclined ring; 235. Rotating shaft; 236. Bevel gear two; 237. Convex ring 237; 3. Mixing section; 31. Rotating rod; 32. Fixed plate; 33. Blade; 34. Stabilizing outer rod; 35. Sieve plate; 351. Opening. Detailed Implementation

[0031] 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 scope of protection of the present utility model.

[0032] Please see Figures 1-4 As shown, this utility model is a continuous urea extraction and purification device, including an extraction tower 1. The bottom and top of the extraction tower 1 are divided into a lower separation section 11 and an upper separation section 12. A first drain port 111 is installed on the lower separation section 11, and a second drain port 112 is installed on the upper separation section 12. A raw material inlet 13 and an extract inlet 14 are respectively installed on the left side of the extraction tower 1. The device also includes:

[0033] Reciprocating section 2, installed at the top of the upper separation section 12, is used to reciprocate the feed liquid and extract liquid inside the extraction tower 1; and

[0034] Mixing section 3 is installed inside extraction tower 1. Reciprocating section 2 is used to provide reciprocating power to mixing section 3, so that mixing section 3 can fully mix the two phases in extraction tower 1.

[0035] The feed liquid inlet 13 is used to add urea feed liquid, and the extract liquid inlet 14 is used to add extract liquid.

[0036] Perforated plates 15 are installed on the inner side of the lower separation section 11 and the inner side of the upper separation section 12. The feed liquid inlet 13 is located at the top of the extraction tower 1, and the extract liquid inlet 14 is located at the bottom of the extraction tower 1. The two phases after mixing are separated into layers by density difference.

[0037] The mixing section 3 includes a rotating rod 31 disposed inside the extraction tower 1. A fixed disk 32 is fixedly connected to the outer surface of the rotating rod 31. Several blades 33 are fixedly connected to the outer side of the fixed disk 32. A stabilizing outer rod 34 is slidably connected to the bottom of the rotating rod 31. Several sieve plates 35 are fixedly connected to the inner wall of the extraction tower 1. The two phases come into countercurrent contact and mix in the extraction tower 1. The reciprocating motion of the fixed disk 32 and the blades 33 can increase the shearing effect of the two phases, making the two phases more fully mixed. In addition, the shearing effect is further improved by the sieve plates 35. This not only makes the two phases more fully mixed again, but also improves the mass transfer efficiency. This method can also improve the purification quality.

[0038] Among them, the rotating rod 31 is used to drive the fixed disk 32 and the blade 33 to move up and down reciprocally, and the stabilizing outer rod 34 is used to maintain the stability of the rotating rod 31.

[0039] The bottom of the stabilizing outer rod 34 is fixedly connected to the inner wall of the lower separation section 11. The screen plate 35 has several openings 351 inside. The openings 351 are adapted to the blades 33. When the blades 33 move, they will pass through the openings 351.

[0040] The reciprocating section 2 includes a baffle 21 fixedly connected to the top of the upper separating section 12, and a support plate 22 fixedly connected to the inner side of the baffle 21; and

[0041] Push assembly 23 is installed inside the retaining housing 21 and is used to provide thrust to the rotating rod 31;

[0042] Among them, a motor 221 is fixedly connected to the left side of the support plate 22, and a bevel gear 222 is fixedly connected to the output end of the motor 221.

[0043] The pushing component 23 includes a lower inclined ring 231 fixedly connected to the top of the rotating rod 31. A convex ring 237 is fixedly connected to the outer side of the lower inclined ring 231. Three limiting rods 232 are slidably connected inside the convex ring 237 on the outer side of the lower inclined ring 231. A spring 233 is fixedly connected to the bottom of the lower inclined ring 231. An upper inclined ring 234 contacts the top of the lower inclined ring 231. A rotating shaft 235 is fixedly connected to the top of the upper inclined ring 234. A bevel gear 236 is fixedly connected to the top of the rotating shaft 235. When the upper inclined ring 234 rotates, after the convex position moves to the convex position of the lower inclined ring 231, it will push the lower inclined ring 231 downward. At this time, the spring 233 is compressed. Then, after the convex position of the upper inclined ring 234 leaves the convex position of the lower inclined ring 231, the lower inclined ring 231 will elastically return to its original position upward through the spring 233. This process is repeated to make the rotating rod 31 move up and down stably, ensuring the mixing effect of the two phases.

[0044] Among them, bevel gear 222 meshes with bevel gear 236, and the rotating shaft 235 is rotatably connected to the central shaft inside the retaining shell 21. When bevel gear 222 rotates, it drives the upper inclined ring 234 to rotate through bevel gear 236 and rotating shaft 235.

[0045] The bottom of the limiting rod 232 is fixedly connected to the top of the upper separating section 12, and the bottom of the spring 233 is fixedly connected to the top of the upper separating section 12. The limiting rod 232 is used to limit the movement of the lower inclined ring 231. When the lower inclined ring 231 is pushed downward, it will squeeze the spring 233, which makes it easier to push the lower inclined ring 231 upward to reset it through the elastic force.

[0046] One specific application of this embodiment is:

[0047] In use, first start the motor 221 to drive the first bevel gear 222 to rotate. The first bevel gear 222 then drives the upper inclined ring 234 to rotate together through the second bevel gear 236 and the rotating shaft 235. Since the bottom of the upper inclined ring 234 and the top of the lower inclined ring 231 are inclined surfaces, after the protruding position of the upper inclined ring 234 moves to the protruding position of the lower inclined ring 231, it will push the lower inclined ring 231 downward. At this time, the spring 233 is compressed, and the rotating rod 31 will move along with it. The limiting rod 232 then moves downward. The inclined ring 231 is limited, causing the lower inclined ring 231 to move in a straight line. Then, after the protruding position of the upper inclined ring 234 leaves the protruding position of the lower inclined ring 231, the lower inclined ring 231 will elastically return to its original position by the spring 233. This process repeats, causing the rotating rod 31 to move up and down. The fixed plate 32 will drive the blade 33 to move together. The blade 33 moves within the opening 351 on the screen plate 35. At the same time, the bottom of the rotating rod 31 moves on the stabilizing outer rod 34 to maintain stability.

[0048] Subsequently, urea feedstock (heavy phase) is continuously added from feedstock inlet 13, and extractant (light phase) is continuously added from extractant inlet 14. The two phases come into countercurrent contact and mix in the extraction tower 1. The reciprocating motion of the fixed disk 32 and blades 33 increases the shearing effect of the two phases, making them more thoroughly mixed. In addition, the sieve plate 35 further enhances the shearing effect, not only making the two phases more thoroughly mixed again, but also improving the mass transfer efficiency. The two mixed phases then separate into layers due to density differences. The light phase (extractant containing urea) enters the upper separation section 12 and is discharged from the second drain outlet 112, while the heavy phase (raffinate) enters the lower separation section 11 and is discharged from the first drain outlet 111. The continuous feeding and discharging design ensures steady-state operation and is suitable for large-scale production.

[0049] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A continuous urea extraction and purification apparatus, comprising an extraction tower (1), wherein the bottom and top portions of the extraction tower (1) have a lower separation section (11) and an upper separation section (12), wherein a first drain port (111) is installed on the lower separation section (11), a second drain port (112) is installed on the upper separation section (12), and a raw material inlet (13) and an extract inlet (14) are respectively installed on the left side of the extraction tower (1), characterized in that, Also includes: Reciprocating section (2), which is installed on the top of the upper separation section (12), is used to reciprocate the raw material liquid and extract liquid inside the extraction tower (1); as well as The mixing section (3) is installed inside the extraction tower (1), and the reciprocating section (2) is used to provide reciprocating power to the mixing section (3), so that the mixing section (3) fully mixes the two phases in the extraction tower (1); The raw material inlet (13) is used to add urea raw material solution, and the extract inlet (14) is used to add extract solution.

2. The continuous urea extraction and purification apparatus according to claim 1, characterized in that, Both the inner side of the lower separation section (11) and the inner side of the upper separation section (12) are equipped with perforated plates (15). The raw material liquid inlet (13) is located at the top of the extraction tower (1), and the extract liquid inlet (14) is located at the bottom of the extraction tower (1). The two phases after mixing are separated into layers by density difference.

3. The continuous urea extraction and purification apparatus according to claim 2, characterized in that, The mixing section (3) includes a rotating rod (31) disposed inside the extraction tower (1). A fixed disk (32) is fixedly connected to the outer surface of the rotating rod (31). Several blades (33) are fixedly connected to the outer side of the fixed disk (32). A stabilizing outer rod (34) is slidably connected to the bottom of the rotating rod (31). Several sieve plates (35) are fixedly connected to the inner wall of the extraction tower (1). The rotating rod (31) is used to drive the fixed disk (32) and the blade (33) to move up and down reciprocally, and the stabilizing outer rod (34) is used to keep the rotating rod (31) stable.

4. The continuous urea extraction and purification apparatus according to claim 3, characterized in that, The bottom of the stabilizing outer rod (34) is fixedly connected to the inner wall of the lower separation section (11). The screen plate (35) has several openings (351) inside. The openings (351) are adapted to the blades (33). When the blades (33) move, they will pass through the openings (351).

5. The continuous urea extraction and purification apparatus according to claim 4, characterized in that, The reciprocating section (2) includes a baffle (21) fixedly connected to the top of the upper separating section (12), and a support plate (22) fixedly connected to the inner side of the baffle (21); and A push assembly (23) is installed inside the retaining shell (21) and is used to provide thrust to the rotating rod (31); Among them, a motor (221) is fixedly connected to the left side of the support plate (22), and a bevel gear (222) is fixedly connected to the output end of the motor (221).

6. The continuous urea extraction and purification apparatus according to claim 5, characterized in that, The pushing assembly (23) includes a lower inclined ring (231) fixedly connected to the top of the rotating rod (31), a convex ring (237) fixedly connected to the outside of the lower inclined ring (231), three limiting rods (232) slidably connected inside the convex ring (237) on the outside of the lower inclined ring (231), a spring (233) fixedly connected to the bottom of the lower inclined ring (231), an upper inclined ring (234) contacting the top of the lower inclined ring (231), a rotating shaft (235) fixedly connected to the top of the upper inclined ring (234), and a bevel gear (236) fixedly connected to the top of the rotating shaft (235). Among them, the first bevel gear (222) is meshed with the second bevel gear (236), the rotating shaft (235) is rotatably connected to the inner central shaft of the baffle (21), and when the first bevel gear (222) rotates, it drives the upper inclined ring (234) to rotate through the second bevel gear (236) and the rotating shaft (235).

7. The continuous urea extraction and purification apparatus according to claim 6, characterized in that, The bottom of the limiting rod (232) is fixedly connected to the top of the upper separation section (12), and the bottom of the spring (233) is fixedly connected to the top of the upper separation section (12). The limiting rod (232) is used to limit the movement of the lower inclined ring (231). When the lower inclined ring (231) is pushed downward, it will squeeze the spring (233), which makes it easier to push the lower inclined ring (231) upward and reset it through elastic force.

Images