Efficient cooling crystallizer

Abstract

The utility model discloses an efficient cooling crystallizer which comprises a crystallizer body, a central pipe is arranged at the top of the crystallizer body, the top end of the central pipe is connected with a circulating reflux inlet and a port at the top of a circulating return pipe, a feeding pipe is arranged at the top of the circulating reflux pipe, and the bottom of the central pipe extends into a product settling zone. The scraper is arranged at the bottom of the product settling zone, the salt collecting hopper is arranged below the product settling zone, the inclined plate clarifying zone is arranged above the product settling zone, an overflow tank is arranged on the outer side of the inclined plate clarifying zone, the top of the overflow tank is connected with a clear liquid outlet, and the clear liquid outlet is connected with a bottom port of the circulating return pipe; the middle part of the circulating return pipe is arranged in the cooler, so that low-temperature efficient crystallization can be realized; the flow sectional area can be effectively reduced, the height of a clarification area is reduced, and the investment cost of the crystallizer is reduced; and adverse effects on production caused by salt collection at the bottom of the crystallizer can be effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of mud applicator technology, specifically a high-efficiency cooling crystallizer. Background Technology

[0002] A cooling crystallizer is a device that lowers the temperature of the material, thereby creating supersaturation and ultimately promoting crystallization. Currently, crystallizers with agitation or external circulation are widely used, and cooling can be achieved through jacketed heat exchange or external heat exchangers. Direct cooling crystallization relies on the direct mixing of the solution and the cooling medium, which is commonly an inert hydrocarbon liquid such as ethylene or Freon. Direct cooling crystallizers come in various types, including kettle-type, rotary, and wet-wall tower types. This type of equipment is suitable for processing systems where the solubility decreases significantly with decreasing temperature.

[0003] To promote the sedimentation and separation of product-grade particulate salt and eliminate the adverse effects of fine crystals on the cooling and crystallization process, the engineering approach is to control the flow rate and residence time of each functional zone to achieve the treatment objective. However, due to the small size of the salt crystal particles and their slow sedimentation rate, the cross-sectional area of ​​the crystallizer is usually quite large, leading to problems such as low crystallizer efficiency, high cost, large footprint, and difficult installation. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency cooling crystallizer to solve the problems mentioned in the background art, such as the existing crystallizers having a relatively large flow cross-sectional area, resulting in low crystallizer efficiency, high cost, large footprint, and difficult installation.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency cooling crystallizer, comprising a crystallizer body and a cooler disposed outside the crystallizer body and connected to the crystallizer body through a circulation return pipe;

[0006] The crystallizer body includes a central tube, a product sedimentation zone, a salt collection hopper, a scraper, an inclined plate clarification zone, and an overflow trough. The central tube is located at the top of the crystallizer body, and its top end is connected to the top port of the circulation return pipe. A feed pipe is located at the top of the circulation return pipe, and the bottom of the central tube extends into the product sedimentation zone. The scraper is located at the bottom of the product sedimentation zone, and the salt collection hopper is located below and connected to the product sedimentation zone. The inclined plate clarification zone is located above the product sedimentation zone and is connected to the product sedimentation zone through a transition zone. An overflow trough is located on the outside of the inclined plate clarification zone, and its top end is connected to the clear liquid outlet. The clear liquid outlet is connected to the bottom port of the circulation return pipe, and the middle part of the circulation return pipe is located inside the cooler.

[0007] A cooling water pump is installed on the circulation return pipe between the cooler and the clear liquid outlet. The cooling water pump includes the cooler and a cooling water inlet and a cooling water outlet installed on the cooler.

[0008] The middle part of the scraper is fixedly connected to the bottom end of the rotating shaft, and the top end of the rotating shaft is fixedly connected to the top end of the motor reducer.

[0009] The bottom of the salt collection hopper is equipped with a discharge port and a crystal slurry outlet.

[0010] Multiple sets of inclined plates are installed in the inclined plate clarification zone. The inclined plates are at a 60-degree angle to the horizontal plane, and the distance between adjacent inclined plates is 60 mm.

[0011] The outer wall of the crystallizer body is equipped with a lower viewing mirror and an upper viewing mirror so that the crystallizer operation status can be accurately observed.

[0012] A rinsing port is provided on the upper part of the crystallizer body.

[0013] An inspection hole is provided on the top of the crystallizer body.

[0014] An overflow port is provided at the top of the crystallizer.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model is equipped with a crystallizer body and a cooler located outside the crystallizer and connected to it through a circulating return liquid pipe. The cooler cools the circulating liquid in the circulating return liquid pipe and mixes it with high-temperature materials to achieve low-temperature feeding, eliminate the fine crystal content in the cooling circulating liquid, and achieve low-temperature and high-efficiency crystallization.

[0017] 2. Inclined plate clarification zone: The inclined plate design increases the hydraulic residence time, improves the surface load of the clarification zone, enhances the precipitation effect of particulate salt, effectively reduces the flow cross-sectional area, lowers the height of the clarification zone, and thus reduces the investment cost of the crystallizer.

[0018] 3. A scraper installed at the bottom of the crystallizer can scrape the granular salt deposited at the bottom of the crystallizer into the salt collection hopper and then smoothly discharge it from the system, which can effectively reduce the adverse effects of salt accumulation at the bottom of the crystallizer on production. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the device of this utility model.

[0020] In the diagram: 1. Discharge port; 2. Crystal slurry outlet; 3. Salt collection hopper; 4. Scraper; 5. Lower sight glass; 6. Central tube; 7. Upper sight glass; 8. Inclined plate clarification zone; 9. Rinsing port; 10. Inspection hole; 11. Motor reducer; 12. Overflow port; 13. Circulation return port; 14. Clear liquid outlet; 15. Overflow trough; 16. Transition zone; 17. Product sedimentation zone; 18. Circulation return pipe; 19. Cooling circulating water pump; 20. Cooler; 21. Cooling water inlet; 22. Cooling water outlet; 23. Feed pipe. Detailed Implementation

[0021] 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.

[0022] Please see Figure 1 This utility model provides a technical solution: a high-efficiency cooling crystallizer, including a crystallizer body and a cooler 20 disposed outside the crystallizer body and connected to the crystallizer body through a circulation return pipe 18;

[0023] The circulation return port 13 and the clear liquid outlet 14 of the crystallizer body are connected to the top port and the bottom port of the circulation return pipe 18, respectively. A cooling circulating water pump 19 is provided on the circulation return pipe 18 between the cooler 20 and the clear liquid outlet 14. The cooling circulating water pump 19 includes the cooler 20 and a cooling water inlet 21 and a cooling water outlet 22 provided on the cooler 20. The cooling circulating water pump 19 promotes the circulation liquid in the circulation return pipe 18 to enter the cooler 20 for cooling. The cooled circulation liquid flows back to the crystallizer body. The cooler 20 is provided with a cooling water inlet 21 for cooling water to enter and a cooling water outlet 22 for cooling water to exit, so as to realize the cooling function of the cooler 20.

[0024] A feed pipe 23 is provided at the top of the circulation reflux pipe 18. The raw material enters through the feed pipe 23, mixes with the circulating liquid, and then enters the crystallizer body through the circulation reflux pipe 18. It then enters the product sedimentation zone 17 from the top of the crystallizer body and the central pipe 6. A scraper 4 with a scraper plate is provided at the bottom of the product sedimentation zone 17. The middle part of the scraper 4 is fixedly connected to the bottom end of the rotating shaft, and the top end of the rotating shaft is fixedly connected to the top end of the motor reducer 11. When the motor reducer 11 is started, it drives the rotating shaft and the scraper 4 to rotate, and the crystals precipitated at the bottom of the product sedimentation zone 17 are collected by the scraper 4 into the salt collection hopper 3. The salt collection hopper 3 is connected to the crystal slurry outlet 2, and the salt slurry passes through the crystal slurry outlet. 2. Discharge; The crystal slurry outlet 2 is connected to the discharge port 1, and the crystal slurry enters the solid-liquid separation device through the discharge port 1; The product sedimentation zone 17 is connected to the inclined plate clarification zone 8 through the transition zone, and the fine crystals that fail to settle are precipitated through the inclined plate clarification zone 8; The inclined plate clarification zone 8 is connected to the overflow tank 15, and the clear liquid passing through the inclined plate clarification zone 8 overflows evenly from the periphery of the inclined plate clarification zone 8 into the overflow tank 15; The overflow tank 15 is connected to the clear liquid outlet 14, and the clear liquid collected in the overflow tank 15 is discharged through the clear liquid outlet 14 and enters the circulating return pipe 18. After being cooled by the cooler 20 to achieve convective heat exchange cooling, it re-enters the crystallizer body to achieve circulating cooling crystallization.

[0025] In this invention, the circulation return pipe 18 is connected to the feed pipe 23 to achieve uniform mixing of the cooled circulating liquid and the high-temperature raw material, thereby reducing the inlet temperature and eliminating the fine crystal content in the cooling circulating liquid.

[0026] In this invention, the liquid flow rate in the central tube 6 is controlled at 0.5-0.8 m / s, the distance between the bottom end of the central tube 6 and the bottom of the product sedimentation zone 17 is 0.5-0.8 meters, the bottom of the central tube 6 adopts an involute design, and the involute end is directly 1.3 times the length of the straight section of the central tube 6.

[0027] In this invention, the scraper 4 is connected to the motor reducer 11 at the top of the crystallizer via a rotating shaft. The scraper 4 rotates at a speed of 2-4 r / min. The scraper blades are staggered at the bottom of the scraper 4, and the scraper blades form an 18-degree angle with the scraper 4 so that the salt crystals can be smoothly scraped to the salt collection hopper 3.

[0028] In this utility model, the angle between the bottom of the product sedimentation zone 17 and the salt collection hopper 3 is equal to 105 degrees, which is beneficial to the collection work of the scraper 4. The angle between the salt collection hopper 3 and the crystal slurry outlet 2 is greater than 150 degrees, and the above-mentioned arrangement is conducive to the discharge of crystal slurry.

[0029] The scraper 4 installed at the bottom of the crystallizer body can scrape the granular salt deposited at the bottom of the crystallizer into the salt collection hopper 3 and then smoothly discharge it from the system, which can effectively reduce the adverse effects of salt accumulation at the bottom of the crystallizer on production.

[0030] In this invention, the angle between the product sedimentation zone 17 and the inclined plate clarification zone 8 is greater than or equal to 150 degrees, which facilitates the flow of the product sedimentation zone 17 to the inclined plate clarification zone 8. The inclined plate clarification zone 8 is equipped with multiple sets of inclined plates, which are at a 60-degree angle to the horizontal plane, with a spacing of 60 mm between adjacent inclined plates. The material of the inclined plates in the inclined plate clarification zone 8 should be selected according to factors such as working temperature, corrosiveness, and material strength. The inclined plate clarification zone 8 increases the hydraulic residence time and improves the surface load of the clarification zone through the design of the inclined plate sedimentation zone, thereby enhancing the precipitation effect of particulate salts. It can effectively reduce the flow cross-sectional area and reduce the height of the clarification zone, thereby reducing the investment cost of the crystallizer.

[0031] In this invention, a lower viewing mirror 5 and an upper viewing mirror 7 are provided on the outer wall of the crystallizer so that the crystallizer's operating status can be accurately observed.

[0032] In this invention, a rinsing port 9 is provided at the top of the crystallizer to prevent salt from accumulating and clogging in the clear liquid outlet 14.

[0033] In this invention, an inspection hole 10 is provided on the top of the crystallizer to facilitate observation and maintenance of the crystallizer's interior.

[0034] In this invention, an overflow port 12 is provided at the top of the crystallizer. When the liquid is not drained in time, the excess liquid can be smoothly discharged from the overflow port 12.

[0035] 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 high-efficiency cooling crystallizer, characterized in that: It includes a crystallizer body and a cooler disposed outside the crystallizer body and connected to the crystallizer body through a circulation return pipe; The crystallizer body includes a central tube, a product sedimentation zone, a salt collection hopper, a scraper, an inclined plate clarification zone, and an overflow trough. The central tube is located at the top of the crystallizer body, and its top end is connected to the top port of the circulation return pipe. A feed pipe is located at the top of the circulation return pipe, and the bottom of the central tube extends into the product sedimentation zone. The scraper is located at the bottom of the product sedimentation zone, and the salt collection hopper is located below and connected to the product sedimentation zone. The inclined plate clarification zone is located above the product sedimentation zone and is connected to the product sedimentation zone through a transition zone. An overflow trough is located on the outside of the inclined plate clarification zone, and its top end is connected to the clear liquid outlet. The clear liquid outlet is connected to the bottom port of the circulation return pipe, and the middle part of the circulation return pipe is located inside the cooler.

2. The high-efficiency cooling crystallizer according to claim 1, characterized in that: A cooling water pump is installed on the circulation return pipe between the cooler and the clear liquid outlet. The cooling water pump includes the cooler and a cooling water inlet and a cooling water outlet installed on the cooler.

3. The high-efficiency cooling crystallizer according to claim 1, characterized in that: The middle part of the scraper is fixedly connected to the bottom end of the rotating shaft, and the top end of the rotating shaft is fixedly connected to the top end of the motor reducer.

4. The high-efficiency cooling crystallizer according to claim 1, characterized in that: The bottom of the salt collection hopper is equipped with a discharge port and a crystal slurry outlet.

5. The high-efficiency cooling crystallizer according to claim 1, characterized in that: Multiple sets of inclined plates are installed in the inclined plate clarification zone. The inclined plates are at a 60-degree angle to the horizontal plane, and the distance between adjacent inclined plates is 60 mm.

6. The high-efficiency cooling crystallizer according to claim 1, characterized in that: The outer wall of the crystallizer body is equipped with a lower viewing mirror and an upper viewing mirror so that the crystallizer operation status can be accurately observed.

7. The high-efficiency cooling crystallizer according to claim 1, characterized in that: A rinsing port is provided on the upper part of the crystallizer body.

8. The high-efficiency cooling crystallizer according to claim 1, characterized in that: An inspection hole is provided on the top of the crystallizer body.

9. A high-efficiency cooling crystallizer according to claim 1, characterized in that: An overflow port is provided at the top of the crystallizer.

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