A melt crystallizer and system

Abstract

The utility model discloses a kind of melting crystallizer and system, comprising: cold and hot all-in-one machine.Cold finger component, along X direction interval is located at the top of cold and hot all-in-one machine, including import header, export header and multiple cold finger body, import header and export header are along Y direction parallel arrangement, and are located at the top of cold and hot all-in-one machine.Multiple cold finger body is located between import header and export header, and is along Y direction interval arrangement.Cold finger body is along the two ends of X direction respectively with import header and export header intercommunication arrangement, bottom inserts cold and hot all-in-one machine setting.Cold finger body is internally provided with helical flow guide, helical flow guide is fixedly connected with the tube wall spot welding of cold finger body, and thread pitch is less than the diameter of cold finger body.Through helical flow guide increase heat transfer efficiency, can accelerate crystallization speed, simultaneously the helical flow generated can make solute distribution in fluid more uniform.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, specifically to a melt crystallizer and system. Background Technology

[0002] Melt crystallization is an important separation and purification technique that utilizes the difference in melting points of mixtures to crystallize and separate different substances. Melt crystallization offers advantages such as being environmentally friendly, requiring no other solvents, operating at low temperatures, being highly efficient, having low energy consumption, and having a wide range of applications. It is widely used in the purification of chemical intermediates, pharmaceutical intermediates, and other products.

[0003] The cold fingers of existing melt crystallizers generally have the following defects: the internal flow is laminar, the heat transfer coefficient is low, and the crystal growth rate is limited; they are mostly welded fixed structures, and the cold fingers or plate bundles cannot be quickly disassembled and cleaned after scaling, resulting in short continuous operation cycles and high maintenance costs; the structure is integrally welded, which makes online cleaning impossible and the shutdown maintenance cycle is long. Utility Model Content

[0004] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a solution to the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention employs a melting crystallizer, comprising: a cooling and heating integrated machine. A cold finger assembly, spaced apart along the X-direction at the top of the cooling and heating integrated machine, includes an inlet manifold, an outlet manifold, and multiple cold finger bodies. The inlet manifold and the outlet manifold are arranged parallel along the Y-direction and positioned above the cooling and heating integrated machine. Multiple cold finger bodies are disposed between the inlet manifold and the outlet manifold, spaced apart along the Y-direction. The two ends of each cold finger body along the X-direction are respectively connected to the inlet manifold and the outlet manifold, and the bottom is inserted into the cooling and heating integrated machine. A spiral guide is provided inside each cold finger body, and the spiral guide is spot-welded to the wall of the cold finger body, with the thread pitch smaller than the diameter of the cold finger body.

[0006] The spiral guide component provided by this invention is spot-welded to the wall of the cold finger body. This connection method ensures the stability of the spiral guide component without causing excessive damage to the structure of the cold finger body. The spiral guide component enables the fluid to flow in a spiral pattern inside the cold finger body. Because the thread pitch is smaller than the diameter of the cold finger body, this spiral flow increases the contact area between the fluid and the wall of the cold finger body, resulting in more efficient heat transfer. During the crystallization process, the temperature change of the fluid is a crucial factor affecting the crystallization rate. By increasing the heat transfer efficiency through the spiral guide component, the crystallization speed can be accelerated, and the crystallization efficiency can be improved. Simultaneously, the spiral flow generated by the spiral guide component can make the solute distribution in the fluid more uniform.

[0007] In some embodiments, the cold finger body is continuously bent and includes an inlet section, a U-shaped section, and an outlet section. The inlet section and the outlet section are respectively located on both sides of the top of the U-shaped section along the X direction and are smoothly connected to the U-shaped section. The end of the inlet section away from the U-shaped section is connected to the inlet manifold, and the end of the outlet section away from the U-shaped section is connected to the outlet manifold. The spiral guide members are respectively disposed inside the two forks of the U-shaped section.

[0008] Using the above technical solution, the inlet and outlet sections of the cold finger body are respectively located on both sides of the top of the U-shaped section along the X direction and are smoothly connected to the U-shaped section. This smooth connection design can reduce the resistance of the fluid during the flow process, allowing the fluid to enter the cold finger body from the inlet manifold more smoothly, and then flow out from the outlet manifold after passing through the U-shaped section.

[0009] In some embodiments, both forks of the U-shaped segment are tapered from top to bottom along the Z direction, with the resulting cone angle α < 10°.

[0010] By employing the above technical solution, the conical contraction design allows the fluid to decelerate and change direction more smoothly when entering the two forks of the U-shaped section. This gradual contraction reduces turbulence and resistance generated when the fluid enters the forks, allowing the fluid to enter the U-shaped section more smoothly. Simultaneously, the conical contraction design lengthens the flow path of the fluid within the two forks of the U-shaped section, increasing the residence time of the fluid within these forks. This facilitates more thorough heat exchange between the fluid and the wall of the cold finger tube, improving heat transfer efficiency. During the crystallization process, this increased residence time allows for better control of fluid temperature changes, promoting crystal formation.

[0011] In some embodiments, a fixing plate is provided near the top of the U-shaped segment. The fixing plate extends along the X direction and is fitted onto the two forks of the U-shaped segment. The fixing plate has multiple mounting flanges for detachable connection to the top of the integrated heating and cooling unit.

[0012] Using the above technical solution, the fixing plate extends along the X direction and fits onto the two forks of the U-shaped segment. This design provides additional support for the U-shaped segment. The U-shaped segment may experience significant forces during fluid flow and temperature changes; the fixing plate effectively disperses these forces. The detachable flange connection makes the installation and disassembly of the cold finger assembly more convenient and quick. During equipment maintenance or replacement of the cold finger assembly, no complex welding or cutting operations are required; installation or disassembly can be completed simply by loosening or tightening the flange bolts, greatly reducing maintenance time and labor intensity. This also reduces deformation and damage to the U-shaped segment, enhancing the overall structural stability of the cold finger assembly.

[0013] In some embodiments, the cold finger assembly further includes a plurality of quick-connect clamps, which are correspondingly arranged with the plurality of cold finger assemblies and are respectively located at one end of the inlet section near the inlet manifold and at one end of the outlet section near the outlet manifold.

[0014] The quick-connect clamp design, employing the above technical solution, makes the installation and disassembly of the cold finger assembly more convenient and efficient. During equipment installation or maintenance, simply slip the clamp over the connection and tighten it to complete the connection; for disassembly, simply loosen the clamp. This rapid connection method significantly reduces installation and disassembly time and labor intensity. When maintaining the equipment or replacing the cold finger assembly, the quick-connect clamp enables rapid connection and disassembly operations.

[0015] In some embodiments, the spiral guide is a single continuous spiral plate or a double-layer reverse spiral tube with a thread pitch P = 0.6–0.8D, where D is the inner diameter of the cold finger body.

[0016] The quick-connect clamp design, employing the above technical solution, makes the installation and disassembly of the cold finger assembly more convenient and efficient. During equipment installation or maintenance, simply slip the clamp over the connection and tighten it to complete the connection; for disassembly, simply loosen the clamp. This rapid connection method significantly reduces installation and disassembly time and labor intensity. When maintaining the equipment or replacing the cold finger assembly, the quick-connect clamp enables rapid connection and disassembly operations.

[0017] In some embodiments, the cold finger body is made of a seamless round tube, made of 316L or C-276 Hastelloy alloy, with a wall thickness of 3-5 mm, and the surface is polished by a mechanical-electrolytic composite polishing process, with a surface roughness Ra≤0.4 μm.

[0018] Using the above technical solution, the seamless round tube has no welded joints. This structural integrity improves the reliability and safety of the cold-flanged tube body, especially under high pressure or high temperature conditions. 316L stainless steel is a high-performance austenitic stainless steel with good corrosion resistance, high temperature resistance, and stress corrosion resistance. C-276 Hastelloy is a nickel-based alloy with excellent corrosion resistance, especially in strong acid, strong alkali, and high-temperature environments. The mechanical-electrolytic composite polishing process enables the surface of the cold-flanged tube body to achieve a very high degree of smoothness. This high-smooth surface reduces fluid resistance within the cold-flanged tube body, improving fluid flow efficiency.

[0019] A melt crystallization system includes a melt crystallizer, a filter, and a mixer as described in several embodiments, wherein the melt crystallizer is connected to the filter and the mixer, respectively, and the filter and the mixer are connected.

[0020] By adopting the above technical solution, the connection between the melt crystallizer, filter, and mixer forms an integrated crystallization process. This integrated design reduces the transfer time of materials between different devices, avoids material loss and contamination that may occur in intermediate stages, and improves the overall system operating efficiency. Through this connection method, materials can flow efficiently within the system according to a preset path, ensuring that materials are fully processed in each device. Attached Figure Description

[0021] Figure 1 This is a perspective view of an embodiment of a melt crystallizer according to the present invention; Figure 2 This is a perspective view of the cold fingering component of an embodiment of a melt crystallizer according to the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a partial structural schematic diagram of an embodiment of a melt crystallizer according to the present invention; Figure 5 This is a schematic diagram of the structure of a spiral guide component in an embodiment of a melt crystallizer according to the present invention, wherein the left side is a single continuous spiral plate and the right side is a double-layer reverse spiral tube; In the picture: 1. Melting crystallizer; 2. Integrated heating and cooling unit; 3. Cold finger assembly; 30. Inlet manifold; 31. Outlet manifold; 32. Cold finger body; 33. Spiral guide; 34. Inlet section; 35. U-shaped section; 36. Outlet section; 37. Fixing plate; 38. Quick-connect clamp. Detailed Implementation

[0022] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0023] refer to Figures 1 to 5 , Figure 1 A perspective view of a melt crystallizer 1 provided in an embodiment of the present invention is shown; Figure 2 A perspective view of the cold finger assembly 3 in a melt crystallizer 1 provided by an embodiment of the present invention is shown; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This diagram shows a partial structural schematic of a melt crystallizer 1 provided in an embodiment of the present invention; Figure 5 The diagram shows a schematic of the spiral guide 33 in a melt crystallizer 1 provided by an embodiment of the present invention. The left side is a single continuous spiral plate, and the right side is a double-layer reverse spiral tube.

[0024] like Figures 1 to 5 As shown, the technical solution provided in this application is a melt crystallizer 1, including: a cooling and heating integrated machine 2. Cold finger assemblies 3 are spaced apart at the top of the cooling and heating integrated machine 2 along the X direction, including an inlet manifold 30, an outlet manifold 31, and multiple cold finger bodies 32. The inlet manifold 30 and the outlet manifold 31 are arranged parallel to each other along the Y direction and are positioned above the cooling and heating integrated machine 2. Multiple cold finger bodies 32 are positioned between the inlet manifold 30 and the outlet manifold 31, spaced apart along the Y direction. The two ends of each cold finger body 32 along the X direction are respectively connected to the inlet manifold 30 and the outlet manifold 31, and the bottom is inserted into the cooling and heating integrated machine 2. A spiral guide 33 is provided inside each cold finger body 32. The spiral guide 33 is spot-welded to the pipe wall of the cold finger body 32, and the thread pitch is smaller than the diameter of the cold finger body 32.

[0025] The melt crystallizer 1 provided in this application has a spiral guide 33 fixedly connected to the tube wall of the cold finger body 32 by spot welding. This connection method ensures the stability of the spiral guide 33 and allows it to be extracted and cleaned along with the entire cold finger. The spiral guide 33 enables the fluid to generate a spiral flow inside the cold finger body 32. Since the thread pitch is smaller than the diameter of the cold finger body 32, this spiral flow increases the contact area between the fluid and the tube wall of the cold finger body 32, resulting in more efficient heat transfer. During the crystallization process, the temperature change of the fluid is an important factor affecting the crystallization rate. By increasing the heat transfer efficiency through the spiral guide 33, the crystallization speed can be accelerated and the crystallization efficiency improved. At the same time, the spiral flow generated by the spiral guide 33 can make the solute distribution in the fluid more uniform, and the spaced-apart cold finger components 3, such as... Figure 1 Two sets of cold fingering components 3 (A / B) are arranged side by side as shown. After 10 batches of operation, the cold fingering component 3A is switched to the cold fingering component 3B, and the entire cold fingering component 3A is lifted out for cleaning. This allows the cold fingering components to be switched during the feeding process and lifted out for cleaning as a whole, thereby improving the working efficiency of the melt crystallizer 1.

[0026] In some embodiments, reference Figures 1 to 5 The cold finger body 32 is continuously bent and includes an inlet section 34, a U-shaped section 35, and an outlet section 36. The inlet section 34 and the outlet section 36 are respectively located on both sides of the top of the U-shaped section 35 along the X direction and are smoothly connected to the U-shaped section 35. The end of the inlet section 34 away from the U-shaped section 35 is connected to the inlet manifold 30, and the end of the outlet section 36 away from the U-shaped section 35 is connected to the outlet manifold 31. Spiral guide members 33 are respectively located inside the two forks of the U-shaped section 35.

[0027] For example, the inlet section 34 and outlet section 36 of the cold finger body 32 are respectively located on both sides of the top of the U-shaped section 35 along the X direction and are smoothly connected to the U-shaped section 35. This smooth connection design can reduce the resistance of the fluid during the flow process, allowing the fluid to enter the cold finger body 32 from the inlet manifold 30 more smoothly, and flow out from the outlet manifold 31 after passing through the U-shaped section 35.

[0028] In some embodiments, reference Figures 1 to 5 Both forks of the U-shaped segment 35 are tapered from top to bottom along the Z direction, with the resulting cone angle α < 10°.

[0029] For example, the tapered contraction design allows the fluid to decelerate and change direction more smoothly when entering the two forks of the U-shaped segment 35. The U-shaped segment 35, which tapes downwards, ensures that when crystals adhere to the cold finger surface, the presence of the taper, combined with the reduced coefficient of friction due to the treatment of the cold finger surface, prevents or minimizes the adhesion of crystals to the cold finger surface. The nucleation of crystals on and around the cold finger surface then drives the crystallization rate of the material inside the crystallizer.

[0030] In some embodiments, reference Figures 1 to 5 A fixing plate 37 is also provided near the top of the U-shaped section 35. The fixing plate 37 extends along the X direction and is fitted onto the two forks of the U-shaped section 35. The fixing plate 37 is provided with multiple mounting flanges for detachable connection to the top of the integrated cooling and heating unit 2.

[0031] For example, the fixing plate 37 extends along the X direction and is fitted onto the two forks of the U-shaped segment 35. This design provides additional support for the U-shaped segment 35. The U-shaped segment 35 may be subjected to significant forces during fluid flow and temperature changes; the fixing plate 37 effectively disperses these forces. The detachable flange connection makes the installation and removal of the cold finger assembly 3 more convenient and quick. During equipment maintenance or replacement of the cold finger assembly 3, no complex welding or cutting operations are required; installation or removal can be completed simply by loosening or tightening the flange bolts, greatly reducing maintenance time and labor intensity. This also reduces deformation and damage to the U-shaped segment 35, enhancing the overall structural stability of the cold finger assembly 3.

[0032] In some embodiments, reference Figures 1 to 5 The cold finger assembly 3 also includes multiple quick-connect clamps 38, which are correspondingly arranged with the multiple cold finger assemblies 3 and are respectively located at the end of the inlet section 34 near the inlet manifold 30 and the end of the outlet section 36 near the outlet manifold 31.

[0033] For example, the quick-connect clamp 38 is designed to make the installation and removal of the cold finger assembly 3 more convenient and faster. During equipment installation or maintenance, simply put the clamp on the connection and tighten it to complete the connection; to remove it, simply loosen the clamp. This quick connection method greatly reduces the time and labor intensity of installation and disassembly. When maintaining the equipment or replacing the cold finger assembly 3, the quick-connect clamp 38 can quickly complete the connection and disassembly operations.

[0034] In some embodiments, reference Figures 1 to 5 The spiral guide 33 is a single continuous spiral plate or a double-layer reverse spiral tube with a thread pitch P=0.6–0.8D, where D is the inner diameter of the cold finger body 32.

[0035] For example, during the flow of the cold and hot medium within the cold finger body 32, the turbulence caused by the spiral plate guide can create turbulence compared to a smooth tube, thereby increasing the Reynolds number Re by 2-2.5 times and the heat transfer coefficient to 1000-1200 W / (m²·K). Under the same load, the heat transfer area of ​​the cold finger can be effectively reduced, reducing the material and processing costs of the cold finger. At the same time, the temperature accuracy of crystallization also affects the crystallization effect. Q=KA△T. The higher the heat transfer coefficient, the smaller the temperature difference and the higher the temperature accuracy when the heat transfer area is constant. Q=cm△T. The flow rate also affects the temperature accuracy. To ensure temperature accuracy, the system flow rate must be uniform. Specifically, a spiral guide 33 is coaxially arranged inside the cold finger body 32. The form can be: a single continuous spiral plate with a pitch P = 0.6–0.8D (D is the inner diameter of the cold finger). The spiral guide increases the Reynolds number Re by 2.5 times and the overall heat transfer coefficient K reaches 1000 W / (m²·K); or a double-layer reverse spiral tube (in the opposite direction to the refrigerant flow) with a diameter of 4–6 mm and the same pitch setting method.

[0036] In some embodiments, the cold finger body 32 is made of a seamless round tube, made of 316L or C-276 Hastelloy alloy, with a wall thickness of 3-5 mm, and the surface is polished by a mechanical-electrolytic composite polishing process, with a surface roughness Ra≤0.4 μm.

[0037] For example, the seamless round tube has no welded joints, and this structural integrity improves the reliability and safety of the cold finger body 32, especially when operating under high pressure or high temperature conditions. 316L stainless steel is a high-performance austenitic stainless steel with good corrosion resistance, high temperature resistance, and stress corrosion resistance. C-276 Hastelloy is a nickel-based alloy with excellent corrosion resistance, especially in strong acid, strong alkali, and high-temperature environments. The mechanical-electrolytic composite polishing process enables the surface of the cold finger body 32 to achieve a very high degree of smoothness. This high-smooth surface reduces fluid resistance within the cold finger body 32, improving fluid flow efficiency.

[0038] The technical solution provided in this application also includes a melt crystallization system, comprising a melt crystallizer 1, a filter, and a mixer as described in several embodiments, wherein the melt crystallizer 1 is connected to the filter and the mixer, and the filter and the mixer are connected.

[0039] For example, the connection between the melt crystallizer 1, the filter, and the mixer forms an integrated crystallization process. This integrated design reduces the transfer time of materials between different devices, avoids material loss and contamination that may occur in intermediate stages, and improves the overall operating efficiency of the system. Through this connection method, materials can flow efficiently within the system according to a preset path, ensuring that materials are fully processed in each device.

[0040] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A melt crystallizer characterized by, include: Combined heating and cooling unit; A cold finger assembly, spaced apart along the X-direction at the top of the integrated cooling and heating unit, includes an inlet manifold, an outlet manifold, and multiple cold finger bodies. The inlet manifold and the outlet manifold are arranged parallel along the Y-direction and positioned above the integrated cooling and heating unit. The multiple cold finger bodies are positioned between the inlet manifold and the outlet manifold, spaced apart along the Y-direction. Each cold finger body has its two ends connected to the inlet manifold and the outlet manifold respectively along the X-direction, and its bottom is inserted into the integrated cooling and heating unit. The interior of each cold finger body is provided with a spiral guide, which is spot-welded to the wall of the cold finger body, and the thread pitch is smaller than the diameter of the cold finger body.

2. The melt crystallizer according to claim 1, characterized in that, The cold finger body is continuously bent and includes an inlet section, a U-shaped section, and an outlet section. The inlet section and the outlet section are respectively located on both sides of the top of the U-shaped section along the X direction and are smoothly connected to the U-shaped section. The end of the inlet section away from the U-shaped section is connected to the inlet manifold, and the end of the outlet section away from the U-shaped section is connected to the outlet manifold. The spiral guide is respectively located inside the two forks of the U-shaped section.

3. The melt crystallizer according to claim 2, characterized in that, Both forks of the U-shaped segment are tapered from top to bottom along the Z direction, with the resulting cone angle α < 10°.

4. The melt crystallizer according to claim 2, characterized in that, A fixing plate is also provided near the top of the U-shaped segment. The fixing plate extends along the X direction and is fitted onto the two forks of the U-shaped segment. The fixing plate is provided with multiple mounting flanges for detachable connection to the top of the integrated cooling and heating unit.

5. The melt crystallizer according to claim 2, characterized in that, The cold finger assembly also includes multiple quick-connect clamps, which are correspondingly arranged with the multiple cold finger assemblies and are respectively located at one end of the inlet section near the inlet manifold and at one end of the outlet section near the outlet manifold.

6. The melt crystallizer according to claim 1, characterized in that, The spiral guide is a single continuous spiral plate or a double-layer reverse spiral tube with a thread pitch P = 0.6–0.8D, where D is the inner diameter of the cold finger body.

7. The melt crystallizer according to claim 1, characterized in that, The cold finger body is made of a seamless round tube, made of 316L or C-276 Hastelloy alloy, with a wall thickness of 3-5 mm. The surface is polished by mechanical-electrolytic composite polishing process, with a surface roughness Ra≤0.4 μm.

8. A melt crystallization system, characterized in that, It includes a melt crystallizer, a filter, and a mixer as described in any one of claims 1-7, wherein the melt crystallizer is connected to the filter and the mixer, respectively, and the filter and the mixer are connected.

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