Melt crystallization modular refrigerant pipe external film distributor

Abstract

The utility model provides a film distributor outside a melt crystallization modularized refrigerant pipe, which solves the problems of uniformity of refrigerant film distribution and the like, and comprises a vertical crystallizing tank, a plurality of crystallizing pipes connected in parallel are arranged in the vertical crystallizing tank, and film distribution flow guide structures are respectively arranged on the crystallizing pipes. The vertical crystallizing tank is provided with a refrigerant inlet and a refrigerant outlet which are opposite to the film distribution flow guide structure, the film distribution flow guide structure is provided with an overflow disc for the crystallizing pipe to penetrate through, and a spiral flow guide assembly is arranged between the overflow disc and the crystallizing pipe. The heat exchanger has the advantages of good heat exchange effect, stable structure and the like.

Description

Technical Field

[0001] This utility model belongs to the field of melt crystallization technology, specifically relating to a melt crystallization modular refrigerant pipe external membrane device. Background Technology

[0002] Melt crystallizers, based on the differences in solubility or melting point of substances at different temperatures, control the cooling rate and temperature gradient to preferentially crystallize a certain component of a mixture. When the mixture is heated to complete melting and then gradually cooled, the component with the higher crystallization point preferentially precipitates out, forming solid crystals, while other components remain liquid, thus achieving component separation and purification. In practical applications, to improve the external heat transfer coefficient, a falling film distributor is used to evenly distribute the refrigerant onto the outer wall of the crystallizer tube. Under gravity, the refrigerant flows in a falling film manner, thereby enhancing the external heat transfer coefficient and effectively saving heat exchange area. However, in the actual film distribution process, existing crystallizer tubes lack corresponding flow guiding structures for the refrigerant, resulting in uneven refrigerant distribution and poor film distribution, affecting heat exchange.

[0003] To address the shortcomings of existing technologies, people have conducted long-term explorations and proposed various solutions. For example, Chinese patent literature discloses a melt crystallizer [201510150154.3], which includes a shell, a crystallizing tube, and a distribution component disposed at the inlet of the crystallizing tube. An upper cap is provided at the top of the shell, and a lower cap is provided at the bottom of the shell. The shell forms a closed space through the upper and lower caps. An installation hole is provided on the upper cap, and the crystallizing tube is disposed at and communicates with the installation hole. The crystallizing tube extends vertically and passes through the lower cap. The distribution component includes a conical body that can be inserted into the crystallizing tube. The conical body is constructed such that its diameter gradually increases from top to bottom, and a gap is formed between the conical body and the crystallizing tube.

[0004] The above solution has solved the problem of complex internal structure of crystallizer to a certain extent, but it still has many shortcomings, such as poor effect of cold medium film on the outside of crystallizer tube. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a reasonably designed, melt-crystallized modular refrigerant pipe external membrane applicator that ensures the effectiveness of refrigerant membrane application.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a modular refrigerant pipe external membrane device for molten crystallization, comprising a vertical crystallization tank, wherein several parallel crystallization tubes are installed inside the vertical crystallization tank, and each crystallization tube is provided with a membrane guiding structure. The vertical crystallization tank is provided with a refrigerant inlet and a refrigerant outlet opposite to the membrane guiding structure. The membrane guiding structure has an overflow plate for the crystallization tubes to pass through, and a spiral guiding component is provided between the overflow plate and the crystallization tubes.

[0007] In the above-mentioned modular refrigerant pipe external membrane device for molten crystallization, an overflow port is opened on the overflow plate for the crystallization pipe to pass through, and baffles are provided at the edge of the overflow plate and at the overflow port. The height of the baffle at the overflow port is lower than the height of the baffle at the edge of the overflow plate.

[0008] In the above-mentioned molten crystallization modular refrigerant pipe external membrane device, the bottom of the overflow tray is connected to a downwardly extending overflow pipe. The upper end of the overflow pipe is higher than the baffle plate at the overflow port and lower than the baffle plate at the edge of the overflow tray.

[0009] In the above-mentioned modular refrigerant pipe external membrane device for molten crystallization, the spiral flow guiding assembly includes a flow guiding sleeve inserted into the overflow port. The upper end of the flow guiding sleeve is provided with a flow guiding cone surface, and the inner side of the flow guiding sleeve is provided with several centrally symmetrically arranged flow guiding grooves. The flow guiding grooves are spiral in shape, and there is a gap between the inner side of the flow guiding sleeve and the crystallization tube.

[0010] In the above-mentioned modular refrigerant pipe external membrane device for molten crystallization, a limiting component is provided on the inner side of the vertical crystallizer opposite to the overflow plate, and a monitoring component is provided between the overflow plates.

[0011] In the above-mentioned modular refrigerant pipe external membrane device for molten crystallization, the limiting component includes a limiting frame set on the inner wall of the vertical crystallizer. The limiting frame has a limiting rod arranged in a centrally symmetrical manner and extending radially. The lower end of the overflow plate is provided with a limiting groove for the limiting rod to engage. The edge of the overflow plate is kept isolated from the inner wall of the vertical crystallizer.

[0012] In the aforementioned modular refrigerant pipe external membrane device for molten crystallization, the monitoring components include an infrared sensor installed inside the vertical crystallizer and located between the overflow trays.

[0013] In the above-mentioned modular refrigerant pipe external membrane device for molten crystallization, the refrigerant inlet includes a liquid inlet pipe installed on a vertical crystallization tank. The liquid inlet pipe is connected to a ring-shaped liquid inlet located above the overflow plate. The liquid inlet ring has a jet nozzle facing inward.

[0014] In the above-mentioned modular refrigerant pipe external membrane device for molten crystallization, the vertical crystallizer has a hemispherical shape at both ends and a manifold cavity inside that communicates with the crystallization pipe.

[0015] In the above-mentioned modular refrigerant pipe external membrane device for molten crystallization, the outside of the vertical crystallizer is provided with reinforcing ribs distributed circumferentially, and the reinforcing ribs at the upper and lower ends of the vertical crystallizer are in the form of a grid.

[0016] Compared with existing technologies, the advantages of this utility model are as follows: the crystallizer is equipped with an overflow plate and a spiral flow guiding structure to ensure that the refrigerant is evenly distributed on the outer wall of the crystallizer, thereby improving its heat exchange effect; the overflow plate and spiral flow guiding structure can be adjusted according to the specifications and number of crystallizers to adapt to different melting crystallizers; the vertical crystallizer has a built-in monitoring component to monitor the film distribution and heat transfer status in real time, thereby ensuring a stable crystallization rate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a structural cross-sectional view of the present invention;

[0019] Figure 3 This is a structural schematic diagram from another perspective of the present invention;

[0020] Figure 4 This is a schematic diagram of the spiral flow guide assembly of this utility model;

[0021] In the figure, the components are: vertical crystallizer 1, manifold 11, reinforcing rib 12, crystallization tube 2, membrane flow guiding structure 3, refrigerant inlet 4, liquid inlet pipe 41, liquid inlet ring 42, jet nozzle 43, refrigerant outlet 5, overflow plate 6, overflow port 61, baffle plate 62, overflow pipe 63, spiral flow guiding assembly 7, flow guiding sleeve 71, flow guiding cone surface 72, flow guiding groove 73, limiting assembly 8, limiting frame 81, limiting rod 82, and limiting groove 83. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1-4 As shown, a modular refrigerant pipe external film distribution device for melt crystallization includes a vertical crystallizer 1 with a heat-insulated structure. Several parallel crystallizer tubes 2 are installed inside the vertical crystallizer 1, and the crystallizer tubes 2 are made of thermally conductive materials such as copper. To ensure the refrigerant film formation effect, film distribution guiding structures 3 are respectively provided on the crystallizer tubes 2. The vertical crystallizer 1 is provided with a refrigerant inlet 4 and a refrigerant outlet 5 opposite to the film distribution guiding structures 3 to achieve refrigerant circulation. The film distribution guiding structure 3 has an overflow plate 6 through which the crystallizer tubes 2 pass to collect and distribute the refrigerant, achieving full heat exchange layer by layer. A spiral guiding component 7 is provided between the overflow plate 6 and the crystallizer tubes 2 to guide the refrigerant to flow spirally relative to the crystallizer tubes 2, ensuring uniform film thickness.

[0024] Specifically, unlike conventional jet structures, the overflow plate 6 has an overflow port 61 through which the crystallizer tube 2 passes. Baffles 62 are installed at the edge of the overflow plate 6 and at the overflow port 61, with the height of the baffles 62 at the overflow port 61 being lower than the height of the baffles 62 at the edge of the overflow plate 6. The refrigerant flows and collects on the overflow plate 6, overflows from the overflow port 61, and comes into contact with the crystallizer tube 2.

[0025] In detail, since the overflow plate 6 needs to guide the refrigerant to flow down layer by layer, its bottom is connected to an overflow pipe 63 extending downwards. The upper end of the overflow pipe 63 is higher than the baffle 62 at the overflow port 61 but lower than the baffle 62 at the edge of the overflow plate 6. The refrigerant falls in layers through the overflow plate 6, so that the crystallizer 2 is arranged with multiple film structures along the axial direction, ensuring a consistent axial heat exchange rate.

[0026] Furthermore, conventional direct-flow guiding structures cannot guarantee uniform fluid distribution. The spiral guiding assembly 7 employs a guiding sleeve 71 inserted into the overflow port 61. The upper end of the guiding sleeve 71 has a guiding cone surface 72, and the inner side of the guiding sleeve 71 has several centrally symmetrically arranged guiding grooves 73. The guiding grooves 73 are spiral-shaped, and a gap is left between the inner side of the guiding sleeve 71 and the crystallizer tube 2. The guiding cone surface 72 collects the refrigerant and guides it into the guiding grooves 73. The guiding grooves 73 ensure that the refrigerant at the junction of the crystallizer tube 2 and the overflow plate 6 forms a uniform film. Different specifications of guiding sleeves 71 are selected according to the different diameters of the crystallizer tube 2 to ensure a 1-2 mm gap between the inner side of the guiding sleeve 71 and the outer wall of the crystallizer tube 2.

[0027] Furthermore, the vertical crystallizer 1 is equipped with a limiting component 8 that is opposite to the overflow plate 6 on the inner side. A monitoring component is provided between the overflow plates 6 to monitor the refrigerant heat exchange device in real time and to sense the internal temperature of the vertical crystallizer 1.

[0028] In addition, the limiting component 8 improves the ease of installation of the overflow plate 6. Specifically, it includes a limiting frame 81 installed on the inner wall of the vertical crystallizer 1. The limiting frame 81 has limiting rods 82 arranged symmetrically in the center and extending radially. The lower end of the overflow plate 6 is provided with a limiting groove 83 for engaging the limiting rods 82. The edge of the overflow plate 6 is kept isolated from the inner wall of the vertical crystallizer 1. After the crystallization tube 2 passes through the overflow plate 6, the limiting component 8 achieves axial and circumferential limiting and fixing of it with the vertical crystallizer 1.

[0029] Meanwhile, the monitoring components include infrared sensors installed inside the vertical crystallizer 1 and located between the overflow plates 6. These infrared sensors monitor each crystallizer tube 2 to ensure uniform heat exchange.

[0030] As can be seen, the refrigerant inlet 4 includes an inlet pipe 41 installed on the vertical crystallizer 1. The inlet pipe 41 is connected to an annular inlet ring 42 located above the overflow plate 6. The inlet ring 42 has a jet nozzle 43 facing inward. The jet nozzle 43 assists in the uniform contact between the refrigerant and the crystallizer 2, while preventing the inlet pipe 41 from impacting the overflow plate 6.

[0031] It is obvious that the vertical crystallizer 1 is hemispherical at both ends and has a manifold 11 inside that communicates with the crystallization tube 2. The manifold 11 realizes the parallel connection of the crystallization tube 2 and achieves fluid crystallization in conjunction with the external interface.

[0032] Preferably, the vertical crystallizer 1 is set vertically. In order to ensure its structural strength, reinforcing ribs 12 distributed circumferentially are provided on the outside. The reinforcing ribs 12 at the upper and lower ends of the vertical crystallizer 1 are locally reinforced in a grid pattern to improve its resistance to deformation.

[0033] In summary, the principle of this embodiment is as follows: the crystallization tube 2 inside the vertical crystallizer 1 is supported by the overflow plate 6, and the spiral guide assembly 7 guides the refrigerant liquid on the overflow plate 6, so that the refrigerant liquid is evenly distributed on the crystallization tube 2, thereby ensuring the uniformity of heat exchange in the internal crystallization tube 2.

[0034] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0035] Although this paper frequently uses terms such as vertical crystallizer 1, manifold 11, reinforcing rib 12, crystallization tube 2, membrane guide structure 3, refrigerant inlet 4, liquid inlet pipe 41, liquid inlet ring 42, jet nozzle 43, refrigerant outlet 5, overflow plate 6, overflow port 61, baffle plate 62, overflow pipe 63, spiral guide assembly 7, guide sleeve 71, guide cone surface 72, guide groove 73, limiting assembly 8, limiting frame 81, limiting rod 82, and limiting groove 83, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A modular refrigerant pipe external film distribution device for molten crystallization, comprising a vertical crystallization tank (1), wherein a plurality of parallel crystallization tubes (2) are installed inside the vertical crystallization tank (1), and each crystallization tube (2) is provided with a film distribution guiding structure (3), and the vertical crystallization tank (1) is provided with a refrigerant inlet (4) and a refrigerant outlet (5) opposite to the film distribution guiding structure (3), characterized in that, The membrane flow guiding structure (3) has an overflow plate (6) through which the crystallization tube (2) passes, and a spiral flow guiding component (7) is provided between the overflow plate (6) and the crystallization tube (2).

2. The molten crystallization modular refrigerant pipe external membrane device according to claim 1, characterized in that, The overflow plate (6) has an overflow port (61) through which the crystallization tube (2) passes. Baffles (62) are provided on the edge of the overflow plate (6) and at the overflow port (61). The height of the baffles (62) at the overflow port (61) is lower than the height of the baffles (62) at the edge of the overflow plate (6).

3. The molten crystallization modular refrigerant pipe external membrane device according to claim 2, characterized in that, The bottom of the overflow plate (6) is connected to an overflow pipe (63) extending downward. The upper end of the overflow pipe (63) is higher than the baffle plate (62) at the overflow port (61) and lower than the baffle plate (62) at the edge of the overflow plate (6).

4. The molten crystallization modular refrigerant pipe external membrane device according to claim 2, characterized in that, The spiral guide assembly (7) includes a guide sleeve (71) inserted into the overflow port (61). The upper end of the guide sleeve (71) is provided with a guide cone surface (72). The inner side of the guide sleeve (71) is provided with a plurality of centrally symmetrically arranged guide grooves (73). The guide grooves (73) are spiral in shape and there is a gap between the inner side of the guide sleeve (71) and the crystallizing tube (2).

5. The molten crystallization modular refrigerant pipe external membrane device according to claim 1, characterized in that, The vertical crystallizer (1) is provided with a limiting component (8) opposite to the overflow plate (6) on its inner side, and a monitoring component is provided between the overflow plates (6).

6. The molten crystallization modular refrigerant pipe external membrane device according to claim 5, characterized in that, The limiting component (8) includes a limiting frame (81) disposed on the inner wall of the vertical crystallizer (1). The limiting frame (81) has a limiting rod (82) arranged in a centrally symmetrical manner and extending radially. The lower end of the overflow plate (6) is provided with a limiting groove (83) for the limiting rod (82) to engage. The edge of the overflow plate (6) is kept isolated from the inner wall of the vertical crystallizer (1).

7. The molten crystallization modular refrigerant pipe external membrane device according to claim 5, characterized in that, The monitoring components include infrared sensors installed inside the vertical crystallizer (1) and located between the overflow trays (6).

8. The molten crystallization modular refrigerant pipe external membrane device according to claim 1, characterized in that, The refrigerant inlet (4) includes an inlet pipe (41) provided on the vertical crystallizer (1), the inlet pipe (41) is connected to an annular inlet ring (42) located above the overflow plate (6), the inlet ring (42) has a jet nozzle (43) facing inward.

9. The molten crystallization modular refrigerant pipe external membrane device according to claim 1, characterized in that, The vertical crystallizer (1) is hemispherical at both ends and has a manifold (11) inside that communicates with the crystallization tube (2).

10. The molten crystallization modular refrigerant pipe external membrane device according to claim 9, characterized in that, The vertical crystallizer (1) is provided with reinforcing ribs (12) distributed circumferentially on the outside, and the reinforcing ribs (12) at the upper and lower ends of the vertical crystallizer (1) are in the form of a grid.

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