Suction-mixing integrated crystallization device

Abstract

This invention discloses an integrated crystallization device for absorption and mixing. The water-distributing crystal vortex shell includes an outer shell, an inner shell concentrically located outside the inner shell, and a bottom cover plate and a top cover plate fixedly covering the upper and lower ends of the annular gap formed by the outer shell and the inner shell. The inner shell has several perforations spaced apart on its side wall. A water inlet pipe supplies water to the closed annular interlayer space formed by the outer shell, the inner shell, the bottom cover plate, and the top cover plate. A seed crystal conveying pipe communicates with the inside of the inner shell and spins and conveys seed crystals into the inner shell. A precipitant dosing pipe extending into the inner shell at its lower end can deliver precipitant into the inner shell. A guide barrel fixedly inserted into the lower end of the inner shell forms an annular discharge port for crystal downward flow between the outer side of the upper end and the inner side of the lower end of the inner shell. A water flow driver fixed to the inner side of the lower end of the guide barrel can provide downward flow power for the mixed liquid inside the inner shell of the water-distributing crystal vortex shell. This invention does not require the introduction of an additional return water pump, thus solving the problem of high energy consumption in fluidized reaction crystallizers.

Description

Technical Field

[0001] This invention relates to a fluidized bed crystallizer, and more particularly to a crystallization apparatus that integrates absorption and mixing. Background Technology

[0002] The flow state is crucial for the mixing and mass transfer of anions, cations, water, and seed crystals in the reaction crystallization. An efficient crystallizer needs to be equipped with a stirring device. Stirring is critical for controlling the solid-liquid mass transfer in the slurry. When the slurry is stirred evenly, the supersaturation in the liquid phase will be at its lowest, and the surface energy in the solid phase will be at its highest. This will facilitate the precipitation of crystals in the liquid phase and enable crystal growth.

[0003] However, stirring can cause the crystal particles in the slurry to physically break down or completely disintegrate, which makes the surface energy of the solid phase fluctuate, posing a thorny problem for energy conversion in precise chemical control systems.

[0004] Furthermore, the degree of supersaturation in the liquid phase is controlled by collecting the effluent from the crystallizer and using a pump to return it to the crystallizer to fully dilute the anions and cations, thereby controlling the saturation. The introduction of the reflux pump results in significant power consumption, a problem that is unavoidable in the crystallization field. Summary of the Invention

[0005] To overcome the above shortcomings, the present invention provides an integrated absorption and mixing crystallization device, which uses natural fluid to control the supersaturation of anions and cations in the liquid phase, eliminating the need for an additional reflux water pump and solving the problem of high energy consumption in fluidized bed crystallizers.

[0006] The technical solution adopted by this invention to solve its technical problem is: an integrated absorption and mixing crystallization device, comprising a guide tank, a water inlet distribution crystal vortex shell, a water flow driver, a water inlet pipe, a precipitant dosing pipe, and a seed crystal conveying pipe. The water inlet distribution crystal vortex shell includes an outer shell, an inner shell, a bottom cover plate, and a top cover plate. The outer shell is concentrically fitted outside the inner shell. The inner shell has several perforations spaced apart on its sidewall. The bottom cover plate and the top cover plate are respectively fixedly covering the upper and lower ends of the annular gap formed by the outer shell and the inner shell. The outer shell, inner shell, bottom cover plate, and top cover plate together form a closed annular interlayer space. The water inlet pipe communicates with the closed annular interlayer space. The water inlet pipe can... Water can be introduced into the closed annular interlayer space. The seed crystal conveying pipe is connected to the inside of the inner shell and can rotary cut and convey seed crystals into the inner shell. The lower end of the precipitant dosing pipe extends into the inner shell and can convey precipitant into the inner shell. The upper end of the guide barrel is fixedly inserted into the lower end of the inner shell of the water distribution crystal vortex shell, and an annular discharge port for crystal downward is formed between the outer side of the upper end of the guide barrel and the inner side of the lower end of the inner shell of the water distribution crystal vortex shell. The water flow driver is fixedly installed on the inner side of the lower end of the guide barrel and can provide downward flow power for the mixture inside the inner shell of the water distribution crystal vortex shell.

[0007] As a further improvement of the present invention, the inner shell and outer shell of the water inlet distribution crystal vortex shell are coaxially arranged.

[0008] As a further improvement of the present invention, both the inner shell and the outer shell of the water inlet distribution crystal vortex shell are conical cylindrical structures with an upper diameter larger than a lower diameter.

[0009] As a further improvement of the present invention, the outer shell of the water distribution crystal vortex shell is provided with a water inlet tangent to its inner side wall, and the water inlet pipe is sealed and connected to the water inlet. Wastewater enters the upper end of the closed annular interlayer space formed by the outer shell, inner shell, bottom cover plate and top cover plate along the water inlet pipe.

[0010] As a further improvement of the present invention, the outer shell and inner shell of the water distribution crystal vortex shell are respectively provided with a first seed inlet and a second seed inlet that are coaxially opposite each other, and the second seed inlet is tangent to the inner shell inner side wall of the water distribution crystal vortex shell. The seed conveying pipe passes through the first seed inlet in a sealed manner and is in sealed communication with the second seed inlet in a sealed manner. The seed slurry is conveyed to the inner side of the upper end of the inner shell through the seed conveying pipe.

[0011] As a further improvement of the present invention, the precipitant dosing pipe includes a dosing ring pipe and a dosing vertical pipe. The lower end of the dosing vertical pipe is connected to the dosing ring pipe. The lower side of the dosing ring pipe is provided with a plurality of spray nozzles. The plurality of spray nozzles are arranged in a multi-point equidistant distribution state along the dosing ring pipe. After the precipitant flows into the dosing ring pipe along the dosing vertical pipe, it can be sprayed vertically downward from the spray nozzles. The dosing ring is concentrically arranged inside the upper end of the inner shell of the water inlet pipe and the water inlet distribution crystal vortex shell, and there is a gap between the dosing ring and the inner shell sidewall of the water inlet distribution crystal vortex shell.

[0012] As a further improvement of the present invention, the dosing ring of the precipitant dosing pipe is horizontally placed in the inner shell of the water inlet distribution crystal vortex shell, and the height of the dosing ring is lower than the height of the water inlet pipe and the seed crystal delivery pipe. The water inlet pipe 1 and the seed crystal delivery pipe 3 are at the same horizontal height and perpendicular to each other.

[0013] As a further improvement of the present invention, the length of the inner shell of the water distribution crystal vortex shell inserted into the upper end of the guide tube accounts for one-tenth of the total length of the guide tube.

[0014] As a further improvement of the present invention, the perforation axis of the inner shell sidewall of the water inlet distribution crystal vortex shell is perpendicular to the shell wall of the inner shell, and several perforated inner shell sidewalls are distributed in an array along the circumferential direction and the generatrix direction.

[0015] As a further improvement of the present invention, the water flow driver is a turbine driver, including turbine blades, a turbine disk and a rotary drive device. The turbine disk has a circular flat cylindrical structure, and the turbine blades are arranged in an equidistant array along the edge of the turbine disk. The turbine blades include two blades with an included angle of 135 degrees, and the rotary drive device drives the turbine disk to rotate.

[0016] The beneficial technical effects of this invention are as follows: The invention is immersed in the entire slurry system of the fluidized bed crystallizer. Under the action of the water flow driver, the slurry in the fluidized bed crystallizer forms a circulating flow. The crystals grow by swirling along the inner shell of the water inlet distribution crystal vortex shell and flow out through the annular gap between the inner shell and the guide barrel. The crystals do not come into contact with the stirring system of the water flow driver, effectively solving the problem of crystal particles being damaged by stirring in the fluidized bed crystallizer. Furthermore, the effluent liquid phase after crystallization is drawn back into the inner shell of the water inlet distribution crystal vortex shell, where it is uniformly mixed with wastewater and precipitant again, forming a circulating contact. This fully utilizes natural fluid to control the supersaturation of anions and cations in the liquid phase, eliminating the need for an additional return water pump and solving the problem of high energy consumption. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 This is the front view of the present invention;

[0019] Figure 3 This is a top view of the present invention;

[0020] Figure 4 This is a perspective view of the water inlet pipe of the present invention;

[0021] Figure 5 This is a three-dimensional view of the precipitant dosing tube of the present invention;

[0022] Figure 6 This is a perspective view of the seed material delivery tube of the present invention;

[0023] Figure 7 This is a perspective view of the water inlet distribution crystal vortex shell of the present invention;

[0024] Figure 8 This is a perspective view of the flow guide barrel of the present invention;

[0025] Figure 9 This is a perspective view of the water flow actuator of the present invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0027] Example: A crystallization device integrating suction and mixing includes a guide tank 5, a water inlet distribution crystal vortex shell 4, a water flow driver 6, a water inlet pipe 1, a precipitant dosing pipe 2, and a seed crystal conveying pipe 3. The water inlet distribution crystal vortex shell 4 includes an outer shell 41, an inner shell 42, a bottom cover plate 43, and a top cover plate 44. The outer shell 41 is concentrically fitted outside the inner shell 42. The inner shell has a plurality of perforations 421 spaced apart on its sidewall. The bottom cover plate 43 and the top cover plate 44 are respectively fixedly covering the upper and lower ends of the annular gap formed by the outer shell 41 and the inner shell 42. The outer shell 41, the inner shell 42, the bottom cover plate 43, and the top cover plate 44 together form a closed annular interlayer space. The water inlet pipe 1 communicates with the closed annular interlayer space and can supply water to the crystals. Water is introduced into the closed annular interlayer space. The seed crystal conveying pipe 3 is connected to the interior of the inner shell 42. The seed crystal conveying pipe 3 can spin-cut and convey seed crystals into the interior of the inner shell 42. The lower end of the precipitant dosing pipe 2 extends into the interior of the inner shell 42. The precipitant dosing pipe 2 can convey precipitant into the inner shell 42. The upper end of the guide barrel 5 is fixedly inserted into the lower end of the inner shell 42 of the water distribution crystal vortex shell 4. An annular discharge port for crystal downward flow is formed between the outer side of the upper end of the guide barrel 5 and the inner side of the lower end of the inner shell 42 of the water distribution crystal vortex shell 4. The water flow driver 6 is fixedly installed on the inner side of the lower end of the guide barrel 5. The water flow driver 6 can provide downward flow power for the mixture inside the inner shell 42 of the water distribution crystal vortex shell 4.

[0028] The inlet pipe 1 connects to the closed annular interlayer space to allow wastewater to enter. The wastewater then disperses into the inner shell 42 through the perforations 421 on the inner shell 42. The seed crystal delivery pipe 3 penetrates the outer shell 41 and the inner shell 42, extending into the inner shell 42. Seed crystal slurry is delivered into the inner shell 42 via the seed crystal delivery pipe 3. The precipitant dosing pipe 2 is installed inside the inner shell 42 of the inlet water distribution crystal vortex shell 4, adding precipitant into the inner shell 42. The water flow actuator 6 causes the wastewater, precipitant, and seed crystal slurry within the inlet water distribution crystal vortex shell 4 to flow downwards. The seed crystal slurry rotates downwards along the wall of the inner shell 42. The water flows out from the gap between the guide tube and the inner shell 42, preventing the seed slurry from entering the high-speed guide tube and being broken by the water flow driver 6, effectively solving the problem of crystal particle breakage. As the seed slurry flows downward along the inner shell 42 and flows out, it will undergo secondary crystallization with wastewater and precipitant. The effluent after the reaction will flow into the guide tube and be sprayed vertically downward at high speed by the turbine driver. The crystallized effluent liquid phase will be sucked back into the inner shell 42 from above, where it will be uniformly mixed with wastewater and precipitant again. This fully utilizes natural fluids to control the supersaturation of anions and cations in the liquid phase, eliminating the need for an additional return water pump and thus solving the problem of high energy consumption.

[0029] The inner shell 42 and outer shell 41 of the water inlet distribution crystal vortex shell 4 are coaxially arranged, which makes the closed annular interlayer space form a ring structure with uniform thickness, which is conducive to uniform water inlet.

[0030] The inner shell 42 and outer shell 41 of the water inlet distribution crystal vortex shell 4 are both conical cylindrical structures with an upper diameter larger than a lower diameter. This allows for thorough mixing of the precipitant and wastewater in the upper space, while the water flow gradually increases in speed and gradually comes into full contact with the seed crystals as it flows downwards. Alternatively, the inner shell 42 and outer shell 41 can also be an annular cylindrical structure with the same upper and lower diameters. This is an equivalent replacement structure that is easily conceived by those skilled in the art based on this patent and falls within the scope of protection of this patent.

[0031] The outer shell 41 of the water inlet distribution crystal vortex shell 4 has an inlet 45 tangential to its inner sidewall. The inlet pipe 1 is sealed and connected to the inlet 45. Wastewater enters through the inlet pipe 1 and flows into the upper end of the closed annular interlayer space formed by the outer shell 41, inner shell 42, bottom cover plate 43, and top cover plate 44. The wastewater inlet adopts a vortex inlet method, which can realize the rapid flow of wastewater along the closed annular interlayer space, preventing wastewater from stagnating in the closed annular interlayer space. This allows the wastewater to enter the inner shell 42 uniformly, stably, and synchronously. The wastewater entering the inner shell 42 will also form a vortex, allowing it to fully contact the precipitant for crystallization reaction. At the same time, the crystals generated after the reaction between the wastewater and the precipitant move rapidly toward the sidewall of the inner shell 42 and adhere to the surface of the seed crystal.

[0032] The outer shell 41 and inner shell 42 of the water distribution crystal vortex shell 4 are respectively provided with a first seed inlet 46 and a second seed inlet 47 that are coaxially opposite each other. The second seed inlet 47 is tangent to the inner side wall of the inner shell 42 of the water distribution crystal vortex shell 4. The seed conveying pipe 3 passes through the first seed inlet 46 in a sealed manner and is in sealed communication with the second seed inlet 47. The seed slurry is conveyed to the inner side of the upper end of the inner shell 42 through the seed conveying pipe 3. This structure allows the seed slurry to swirl along the side wall of the inner shell 42 after entering the inner shell 42. Since there is a gap between the inner shell 42 of the water distribution crystal swirl shell 4 and the guide tube, the seed crystals swirling downward along the side wall of the inner shell 42 of the water distribution crystal swirl shell 4 will flow out along this gap and enter the crystallizer, without entering the guide tube. This avoids the seed crystals contacting the water flow driver 6, thus preventing the seed crystals from being broken by the water flow driver 6, and effectively solving the problem of crystal particle breakage.

[0033] The precipitant dosing pipe 2 includes a dosing ring pipe 22 and a dosing vertical pipe 21. The lower end of the dosing vertical pipe 21 is connected to the dosing ring pipe 22. The lower side of the dosing ring pipe 22 is provided with several spray nozzles 23, which are distributed equidistantly along the dosing ring pipe 22. After the precipitant flows into the dosing ring pipe 22 along the dosing vertical pipe 21, it can be sprayed vertically downwards from the spray nozzles 23. The dosing ring is concentrically located inside the upper end of the inner shell 42 of the inlet pipe 1 and the inlet distribution crystal vortex shell 4, and there is a gap between the dosing ring and the side wall of the inner shell 42 of the inlet distribution crystal vortex shell 4. The precipitant first enters the dosing vertical pipe 21, then flows into the dosing ring pipe 22, and finally is sprayed vertically downwards from the spray nozzles 23. This allows the precipitant to be quickly dispersed in the inner shell 42, achieving sufficient contact with the wastewater and improving reaction efficiency.

[0034] The dosing ring 22 of the precipitant dosing pipe 2 is horizontally placed within the inner shell 42 of the inlet water distribution crystal vortex shell 4. The height of the dosing ring 22 is lower than the height of the inlet pipe 1 and the seed crystal delivery pipe 3. The inlet pipe 11 and the seed crystal delivery pipe 3 are at the same horizontal height and perpendicular to each other. This ensures that all wastewater comes into full contact with the precipitant, preventing wastewater from flowing downwards without reacting with the precipitant. The vertical arrangement of the inlet pipe 1 and the seed crystal delivery pipe ensures that they are staggered and do not interfere with each other.

[0035] The length of the inner shell 42 of the water inlet distribution crystal vortex shell 4 inserted into the upper end of the guide tube accounts for one-tenth of the total length of the guide tube. This ensures that crystal particles do not enter the guide tube, while ensuring that the wastewater and precipitant react fully and that the generated crystals are in full contact with the seed crystals. It also allows the liquid phase after the reaction to flow rapidly downward along the guide tube.

[0036] The perforations 421 on the sidewall of the inner shell 42 of the water inlet distribution crystal vortex shell 4 are perpendicular to the shell wall of the inner shell 42, and a number of perforations 421 are distributed in an array along the circumferential direction and the generatrical direction on the sidewall of the inner shell 42. That is, a number of perforations 421 are distributed in a circumferential array in the horizontal direction and in a linear array along the shell wall. The perpendicularity of the perforation 421 axis to the sidewall of the inner shell 42 makes the inlet water have both vortex characteristics and flow towards the middle of the inner shell 42, thereby rapidly dispersing inside the inner shell 42.

[0037] The water flow actuator 6 is a turbine actuator, comprising turbine blades 61, a turbine disk 62, and a rotary drive device. The turbine disk 62 has a circular, flat cylindrical structure, and the turbine blades 61 are arranged in an equidistant array along the edge of the turbine disk 62. Each turbine blade 61 includes two blades with an included angle of 135 degrees. The rotary drive device drives the turbine disk 62 to rotate. The water flow actuator 6 uses a turbine actuator to achieve downward rotating water flow, ensuring that the crystal particles rotate and move downward along the side wall of the inner shell 42, preventing the crystal particles from entering the guide tube. The water flow actuator 6 is not limited to the turbine structure described above; it can also be a power transmission device such as a pump or agitator to achieve downward vertical water spraying.

Claims

1. A crystallization apparatus integrating adsorption and mixing, characterized in that: The system includes a guide bucket (5), a water inlet distribution crystal vortex shell (4), a water flow actuator (6), a water inlet pipe (1), a precipitant dosing pipe (2), and a seed crystal conveying pipe (3). The water inlet distribution crystal vortex shell includes an outer shell (41), an inner shell (42), a bottom cover plate (43), and a top cover plate (44). The outer shell is concentrically fitted outside the inner shell. The inner shell has several perforations (421) spaced apart on its sidewall. The bottom cover plate and the top cover plate are fixedly covered at the upper and lower ends of the annular gap formed by the outer shell and the inner shell, respectively. The outer shell, the inner shell, the bottom cover plate, and the top cover plate together form a closed annular interlayer space. The water inlet pipe is connected to the closed annular interlayer space. Water pipes can supply water into the closed annular interlayer space. Seed delivery pipes are connected to the interior of the inner shell and can rotary cut and deliver seed crystals into the interior of the inner shell. The lower end of the precipitant dosing pipe extends into the interior of the inner shell and can deliver precipitant into the inner shell. The upper end of the guide barrel is fixedly inserted into the lower end of the inner shell of the water distribution crystal vortex shell, and an annular discharge port for crystal downward flow is formed between the outer side of the upper end of the guide barrel and the inner side of the lower end of the inner shell of the water distribution crystal vortex shell. The water flow actuator is fixedly installed on the inner side of the lower end of the guide barrel and can provide downward flow power for the mixture inside the inner shell of the water distribution crystal vortex shell.

2. The integrated adsorption and mixing crystallization apparatus according to claim 1, characterized in that: The inner and outer shells of the water inlet distribution crystal vortex shell are coaxially arranged.

3. The integrated adsorption and mixing crystallization apparatus according to claim 2, characterized in that: The inner and outer shells of the water inlet distribution crystal vortex shell are both conical cylindrical structures with an upper diameter larger than a lower diameter.

4. The integrated adsorption and mixing crystallization apparatus according to claim 1 or 3, characterized in that: The outer side wall of the water distribution crystal vortex shell is provided with a water inlet (45) that is tangent to its inner side wall. The water inlet pipe is sealed and connected to the water inlet. Wastewater enters the upper end of the closed annular interlayer space formed by the outer shell, inner shell, bottom cover plate and top cover plate along the water inlet pipe.

5. The integrated adsorption and mixing crystallization apparatus according to claim 1 or 3, characterized in that: The outer shell and inner shell of the water distribution crystal vortex shell are respectively provided with a first seed inlet (46) and a second seed inlet (47) that are coaxially opposite each other. The second seed inlet is tangent to the inner shell inner wall of the water distribution crystal vortex shell. The seed conveying pipe passes through the first seed inlet and is sealed and connected to the second seed inlet. The seed slurry is conveyed to the inner side of the upper end of the inner shell through the seed conveying pipe.

6. The integrated adsorption and mixing crystallization apparatus according to claim 1, characterized in that: The precipitant dosing pipe includes a dosing ring pipe (22) and a dosing vertical pipe (21). The lower end of the dosing vertical pipe is connected to the dosing ring pipe. Several spray nozzles (23) are provided on the lower side of the dosing ring pipe. The several spray nozzles are arranged in a multi-point equidistant distribution state along the dosing ring pipe. After the precipitant flows into the dosing ring pipe along the dosing vertical pipe, it can be sprayed vertically downward from the spray nozzles. The dosing ring is concentrically located inside the upper end of the inner shell of the water inlet pipe and the water inlet distribution crystal vortex shell, and there is a gap between the dosing ring and the inner shell sidewall of the water inlet distribution crystal vortex shell.

7. The integrated adsorption and mixing crystallization apparatus according to claim 6, characterized in that: The dosing ring of the precipitant dosing pipe is placed horizontally in the inner shell of the inlet water distribution crystal vortex shell. The height of the dosing ring is lower than the height of the inlet water pipe and the seed crystal delivery pipe. The inlet water pipe 1 and the seed crystal delivery pipe 3 are at the same horizontal height and perpendicular to each other.

8. The integrated adsorption and mixing crystallization apparatus according to claim 1, characterized in that: The length of the inner shell of the water distribution crystal vortex shell inserted into the upper end of the guide tube accounts for one-tenth of the total length of the guide tube.

9. The integrated adsorption and mixing crystallization apparatus according to claim 1, characterized in that: The perforation axis of the inner shell sidewall of the water inlet distribution crystal vortex shell is perpendicular to the shell wall of the inner shell, and several perforated inner shell sidewalls are distributed in an array along the circumferential direction and the generatrix direction.

10. The integrated crystallization device according to claim 1, characterized in that: the water flow driver is a turbine driver, including turbine blades (61), turbine disk (62) and a rotation drive device, the turbine disk is a circular flat cylindrical structure, the turbine blades are arranged in an equidistant array along the edge of the turbine disk, the turbine blades include two blades with an included angle of 135 degrees, and the rotation drive device drives the turbine disk to rotate.

Images