Heat exchanger

Abstract

The utility model discloses a heat exchanger which comprises a shell, a shell pass inlet and a shell pass outlet which are formed in the shell, and at least one heat exchange tube arranged in the shell in a penetrating mode. Each heat exchange tube comprises a plurality of tube bodies, first end parts, second end parts, a first U-shaped joint and a second U-shaped joint, wherein every two tube bodies are arranged at intervals and partially extend out of the shell; the first end parts are arranged at one ends of the tube bodies and are positioned in the shell; the second end parts are arranged at the other ends of the tube bodies and are positioned outside the shell; the convex parts are arranged on the periphery of the outer side of the tube body in an outward convex mode, and the tube pass inlet and the tube pass outlet are formed in the tube body and located outside the shell. The multiple pipe bodies are sequentially communicated end to end through the multiple first U-shaped connectors and the multiple second U-shaped connectors, so that the heat exchange pipe allowing materials to pass through in a one-way mode is formed. The heat exchanger not only can prevent vinyl chloride materials from adhering to and blocking the heat exchange tubes, but also can improve heat exchange efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange, in particular to a heat exchanger. Background Art

[0002] In the existing heat exchanger for transporting vinyl chloride, the heat exchange tube is entirely located in the shell, and the tube heads at both ends of the heat exchange tube extend out of the tube sheet. When the vinyl chloride material with a certain viscosity is transported through the heat exchange tube, the vinyl chloride material is easy to impact the tube sheet and cause material hanging. Because multiple heat exchange tubes are arranged in parallel, the flow rate of vinyl chloride in the heat exchange tube is slow under the same conditions, which not only leads to relatively low heat exchange efficiency, but also causes the vinyl chloride material to adhere and block the transport pipe. Utility Model Content

[0003] The utility model aims to provide a heat exchanger which can not only prevent vinyl chloride materials from adhering to and blocking heat exchange tubes, but also improve heat exchange efficiency.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A heat exchanger, comprising a shell, a shell side inlet and a shell side outlet opened on the shell, the heat exchanger also comprising at least one heat exchange tube penetrating the shell, the heat exchange tube comprising a plurality of tube bodies arranged in pairs and partially extending out of the shell, a first end portion provided at one end of the tube body and located in the shell, a second end portion provided at the other end of the tube body and located outside the shell, a first U-shaped joint for connecting the two first end portions, a second U-shaped joint for connecting the two second end portions, a plurality of convex portions convexly provided on the outer peripheral portion of the tube body, a tube side inlet and a tube side outlet opened on the tube body and located outside the shell;

[0006] The plurality of tubes are connected end to end in sequence through the plurality of the first U-shaped joints and the plurality of the second U-shaped joints to form the heat exchange tube for a single pass of the material.

[0007] Preferably, the heat exchanger further comprises a support plate arranged in the shell, and the support plate is provided with a first through hole for the tube body to pass through.

[0008] More preferably, the aperture of the first through hole is larger than the outer diameter of the tube body, and the heat exchanger further comprises a ring plate which can be mounted on the side of the support plate, the inner diameter of the ring plate is the same as the outer diameter of the tube body, and the ring plate is broken along its own radial direction to form a first plate body and a second plate body which can be spliced ​​with each other.

[0009] Preferably, the plurality of tubes are parallel to each other and parallel to the length extension direction of the shell.

[0010] More preferably, the heat exchanger further comprises a sealing head arranged at one end of the shell, and the plurality of pipes respectively pass through the sealing head and out of the shell.

[0011] Preferably, the inner diameter of the tube body is R, wherein R≥89 mm.

[0012] Preferably, the tube body is a precision-polished tube body, and the roughness of the inner surface of the precision-polished tube body is Ra, wherein 0.8um≤Ra≤1um.

[0013] Preferably, the convex portions are located in the shell, and the convex portions are arranged in an equilateral triangle or square shape on the outer periphery of the tube body.

[0014] More preferably, the distance between each pair of protrusions is D, wherein D≥5 mm.

[0015] More preferably, the protrusion height of the protrusion relative to the tube body is H, wherein H≥1 mm.

[0016] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art: the utility model heat exchanger, in which a plurality of pipe bodies are arranged in a shell and connected end to end through a plurality of first U-shaped joints and a plurality of second U-shaped joints, has the following advantages:

[0017] The tube sheet is omitted, which can prevent sticky materials from impacting the tube sheet and causing material hanging;

[0018] The flow rate of the material is increased, and the heat exchange efficiency is improved. At the same time, the heat exchange tube can also be automatically cleaned. In combination with the multiple convex parts arranged on the tube body, the convex parts serve as evaporation cores, which can further improve the evaporation efficiency and heat exchange efficiency.

[0019] The expansion difference caused by the temperature difference between the tube side and the shell side is absorbed by the first U-shaped joint, so that stress fatigue damage to the heat exchange tube head caused by the high-temperature material during the cooling process can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attached Figure 1 It is a structural schematic diagram of a heat exchanger according to a specific embodiment of the utility model;

[0021] Attached Figure 2 For attachment Figure 1 Left view of

[0022] Attached Figure 3 It is a schematic diagram of the arrangement structure of multiple tubes in the shell;

[0023] Attached Figure 4 is a schematic diagram of the structure of the tube body;

[0024] Attached Figure 5 For attachment Figure 4Left view of

[0025] Attached Figure 6 It is a schematic diagram of the installation structure of the tube body, the support plate and the ring plate;

[0026] Attached Figure 7 Schematic diagram of the installation structure of the tube body and the ring plate.

[0027] Among them: 1. Shell; 2. Shell inlet; 3. Shell outlet; 4. Steam drum; 5. Heat exchange tube; 51. Tube body; 52. First U-shaped joint; 53. Second U-shaped joint; 54. Protrusion; 6. Tube inlet; 7. Tube outlet; 8. Support plate; 81. First through hole; 9. Ring plate; 91. First plate body; 92. Second plate body; 10. Head; 11. Riser; 12. Downcomer. DETAILED DESCRIPTION

[0028] The technical solution of the utility model is further described below in conjunction with specific embodiments and drawings.

[0029] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0030] In the description of the embodiments of the present invention, it needs to be understood that the terms "length", "inside", etc. indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0032] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0033] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] The disclosure below provides many different embodiments or examples for realizing different structures of the embodiments of the present utility model. In order to simplify the disclosure of the embodiments of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0035] See also Figure 1-2 As shown, this embodiment provides a heat exchanger, including a shell 1, a shell inlet 2 and a shell outlet 3 opened on the shell 1. The shell inlet 2 is located at the bottom of the shell 1 and is used to pass cooling water; the shell outlet 3 is located at the top of the shell 1 and is used to connect to the steam drum 4. The steam-water mixture obtained after heat exchange enters the steam drum 4 from the shell outlet 3 through the riser 11, where the steam and water are separated and the steam and water are output respectively, and the water can be passed back to the shell 1 through the downcomer 12. The structure of the steam drum 4 is prior art and will not be described in detail here.

[0036] See also Figure 1-2As shown, the heat exchanger further includes at least one heat exchange tube 5 passing through the shell 1, and the heat exchange tube 5 includes a plurality of tube bodies 51 arranged in pairs and partially extending out of the shell 1, a first end portion provided at one end of the tube body 51 and located in the shell 1, a second end portion provided at the other end of the tube body 51 and located outside the shell 1, a first U-shaped joint 52 for connecting the two first ends, a second U-shaped joint 53 for connecting the two second ends, a tube side inlet 6 and a tube side outlet 7 opened on the tube body 51 and located outside the shell 1, and the tube side inlet 6 and the tube side outlet 7 are respectively used for passing materials in and out. There are a plurality of first U-shaped joints 52 and a plurality of second U-shaped joints 53, respectively, and the plurality of tube bodies 51 are connected end to end in sequence through the plurality of first U-shaped joints 52 and the plurality of second U-shaped joints 53 to form a heat exchange tube 5 for passing materials through in a single pass.

[0037] In this embodiment, the plurality of tubes 51 are parallel to each other and parallel to the length extension direction of the shell 1. The heat exchanger further comprises a head 10 disposed at one end of the shell 1, and the plurality of tubes 51 pass through the head 10 and pass out of the shell 1. Figure 2 As shown, in this embodiment, two heat exchange tubes 5 are provided in the shell 1 , and each heat exchange tube 5 is composed of twelve tube bodies 51 .

[0038] The heat exchange tube 5 formed by connecting a plurality of tubes 51 end to end through a plurality of first U-shaped joints 52 and a plurality of second U-shaped joints 53 in sequence in the shell 1 has the following advantages:

[0039] The tube sheet is omitted in the shell 1, which can prevent the sticky material from impacting the tube sheet and causing material hanging;

[0040] The number of heat exchange tubes 5 through which materials pass at the same time in the shell 1 is greatly reduced, which not only increases the flow rate of the materials and improves the heat exchange efficiency by continuously strengthening the heat transfer, but also realizes the automatic cleaning of the heat exchange tubes 5;

[0041] The first U-shaped joint 52 in the shell 1 absorbs the expansion difference caused by the temperature difference between the tube side and the shell side, thereby avoiding stress fatigue damage to the tube head of the heat exchange tube 5 caused by the high-temperature material during the cooling process.

[0042] See also Figure 3 As shown, a plurality of tubes 51 are arranged at intervals from each other to form a passage for the steam-water mixture to ascend into the steam drum 4, thereby reducing the flow resistance of the steam-water mixture.

[0043] See also Figure 4-5As shown, the heat exchange tube 5 further includes a plurality of convex portions 54 convexly disposed on the outer peripheral portion of the tube body 51. The convex portions 54 serve as evaporation nuclei and can form evaporation points when the cooling water in the shell side evaporates, thereby improving the evaporation efficiency and heat exchange efficiency. Together with the high-temperature material in the tube side that can continuously enhance heat transfer, the two complement each other and can further improve the evaporation efficiency and heat exchange efficiency.

[0044] The convex parts 54 are located in the housing 1, and are arranged in a regular triangle or square shape on the outer periphery of the tube body 51. In this embodiment, the spacing between the convex parts 54 is D, where D≥5mm; the protrusion height of the convex parts 54 relative to the tube body 51 is H, where H≥1mm.

[0045] The inner diameter of the tube body 51 is R, where R≥89mm, such as 157mm, 189mm, 219mm, 273mm, etc.; the length of the tube body 51 is L, where L≥12m. Since the diameter of the tube body 51 is large, it is difficult to make its inner surface meet the roughness requirements through bright annealing. The fine polishing tube body 51 can be obtained through the fine polishing process, and the roughness of the inner surface of the fine polishing tube body 51 is Ra, where 0.8um≤Ra≤1um.

[0046] See also Figure 6-7 As shown, the heat exchanger further comprises a support plate 8 disposed in the housing 1, and a first through hole 81 is disposed on the support plate 8 for the tube 51 to pass through. Since the diameter of the tube 51 is large, its tolerance is also large, and there is a problem that the tube 51 cannot pass through the first through hole 81.

[0047] By setting the aperture of the first through hole 81 to be larger than the outer diameter of the tube body 51, and providing a ring plate 9 that can be installed on the side of the support plate 8, the inner diameter of the ring plate 9 is the same as the outer diameter of the tube body 51, and the ring plate 9 is broken along its own radial direction to form a first plate body 91 and a second plate body 92 that can be spliced ​​with each other.

[0048] During actual installation, the tube body 51 is passed through the larger first through hole 81, and the first plate body 91 and the second plate body 92 are ring-connected on the outside of the tube body 51. After the first plate body 91 and the second plate body 92 are spliced, they are fixed on the support plate 8 by welding to achieve fixed support for the tube body 51.

[0049] The working process of this embodiment is described in detail below:

[0050] During operation, the high-temperature vinyl chloride material enters the heat exchange tube 5 through the tube side inlet 6, and is output from the tube side outlet 7 after being folded back and forth for many times; at the same time, cooling water is sent into the shell 1 from the shell side inlet 2 to exchange heat with the vinyl chloride material, and the obtained steam-water mixture enters the steam drum 4 through the shell side outlet 3 and the riser 11, where the steam and water are separated and output respectively, and the water can be returned to the shell 1 through the downcomer 12.

[0051] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A heat exchanger comprising a shell, a shell side inlet and a shell side outlet opened on the shell, characterized in that: The heat exchanger further comprises at least one heat exchange tube passing through the shell, the heat exchange tube comprising a plurality of tube bodies arranged in pairs and partially extending out of the shell, a first end portion provided at one end of the tube body and located in the shell, a second end portion provided at the other end of the tube body and located outside the shell, a first U-shaped joint for connecting the two first end portions, a second U-shaped joint for connecting the two second end portions, a plurality of convex portions provided outwardly on the outer peripheral portion of the tube body, and a tube side inlet and a tube side outlet opened on the tube body and located outside the shell; The plurality of tubes are connected end to end in sequence through the plurality of the first U-shaped joints and the plurality of the second U-shaped joints to form the heat exchange tube for a single pass of the material.

2. The heat exchanger according to claim 1, characterized in that: The heat exchanger further comprises a support plate arranged in the shell, and a first through hole for the tube body to pass through is provided on the support plate.

3. The heat exchanger according to claim 2, characterized in that: The aperture of the first through hole is larger than the outer diameter of the tube body. The heat exchanger also includes a ring plate that can be installed on the side of the support plate. The inner diameter of the ring plate is the same as the outer diameter of the tube body. The ring plate is broken along its own radial direction to form a first plate body and a second plate body that can be spliced ​​together.

4. The heat exchanger according to claim 1, characterized in that: The plurality of tubes are parallel to each other and parallel to the length extension direction of the shell.

5. The heat exchanger according to claim 4, characterized in that: The heat exchanger further comprises a sealing head arranged at one end of the shell, and the plurality of pipes respectively pass through the sealing head and out of the shell.

6. The heat exchanger according to claim 1, characterized in that: The inner diameter of the tube body is R, wherein R≥89 mm.

7. The heat exchanger according to claim 1, characterized in that: The tube body is a precision polished tube body, and the roughness of the inner surface of the precision polished tube body is Ra, wherein 0.8um≤Ra≤1um.

8. The heat exchanger according to claim 1, characterized in that: The convex parts are located in the shell, and are arranged in an equilateral triangle or square shape at the outer periphery of the tube body.

9. The heat exchanger according to claim 8, characterized in that: The distance between the protrusions is D, wherein D is ≥ 5 mm.

10. The heat exchanger according to claim 8, characterized in that: The protrusion height of the protrusion relative to the tube body is H, wherein H≥1mm.

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