Heat exchanger
By reducing the gap between the baffle plate and the shell and the heat exchange pipe in the heat exchanger, and dividing the shell into multiple areas, each area has an inlet and an outlet, the problems of heat exchange blind spots and uneven temperatures in traditional heat exchangers are solved, and a more uniform heat exchange effect and more stable product quality are achieved.
Patent Information
- Application Number
- CN202421854594.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-01
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-08-01
AI Technical Summary
Traditional tube heat exchangers have problems of dead heat exchange angles and uneven temperatures, which affect the quality of the polymerization reaction.
A heat exchanger is designed, through the gap between the baffle plate and the inner wall of the shell and the outer wall of the heat exchange tube, it reduces the dead corner of heat exchange, and the inner part of the shell is N+1 area through the N row baffle plate, each area has an inlet and an outlet to make the heat exchange medium evenly fill.
The uniformity of heat exchange is achieved, the lateral temperature difference after the material is discharged from the heat exchange pipe is eliminated, and the radial temperature difference of the material is discharged from the heat exchanger is ensured, and the uniformity of the polymerization reaction temperature and product quality are improved.
Smart Images
Figure CN222849848U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat exchangers, in particular to a heat exchanger. Background Art
[0002] For the polymerization reaction of nylon 6 or nylon 66, the system temperature is relatively high. The traditional shell-and-tube heat exchanger has only one feed port and one discharge port, and there is a large gap between the baffle and the tube wall and the inner wall of the shell. This structure causes a heat exchange dead corner in the heat exchanger, and the heat exchange medium generally chooses a shorter travel path in the heat exchanger, which makes the polymerization system temperature uneven, thus affecting the quality of the product. Utility Model Content
[0003] The utility model solves the problems in the related technology and proposes a heat exchanger, in which the gap between the baffle and the inner wall of the shell and the outer wall of the heat exchange tube is less than 2 mm, which greatly reduces the heat exchange dead angle and is beneficial to the uniformity of heat exchange; the interior of the shell is divided into N+1 areas by N rows of baffles, and each heat exchange area has an inlet and an outlet, so that the heat exchange medium can be evenly filled between the tube walls of the heat exchange tube, making the temperature of the reaction system more uniform.
[0004] In order to solve the above technical problems, the utility model is implemented through the following technical solutions: a heat exchanger, comprising a shell, a baffle and a plurality of heat exchange tubes arranged in parallel, wherein N rows of baffles are arranged perpendicular to the heat exchange tubes and the baffles divide the interior of the shell into N+1 heat exchange areas, each of the heat exchange areas having an inlet and an outlet; the gap between the baffle and the inner wall of the shell and the outer wall of the heat exchange tube is less than 2 mm.
[0005] As a preferred solution, both ends of the heat exchange tube are connected to the shell through flanges.
[0006] As a preferred solution, the number of rows N of the baffles is 1-10.
[0007] As a preferred solution, the spacing between two adjacent rows of baffles is 100 to 600 mm.
[0008] As a preferred solution, the heat exchange tubes are divided into at least three tube bundle areas from the center to the outer ring, and the diameters of the heat exchange tubes in the tube bundle areas from the center to the outer ring increase successively.
[0009] As a preferred solution, the diameters of the heat exchange tubes in the tube bundle area from the center to the outer ring increase successively by 10 to 30 mm.
[0010] As a preferred solution, the number of turns of the heat exchange tubes in the center tube bundle area is 2 to 10, and the number of turns of the heat exchange tubes in the outermost tube bundle area is 1 to 4.
[0011] As a preferred solution, a baffle is provided at the inlet.
[0012] As a preferred solution, the included angles between the inlets of two adjacent rows of heat exchange regions and the included angles between the outlets of two adjacent rows of heat exchange regions are both 90°.
[0013] Compared with the prior art, the beneficial effects of the utility model are:
[0014] (1) The baffles are adapted to the shape of the shell. The gap between the baffles and the inner wall of the shell and the gap between the baffle holes and the outer wall of the heat exchange tube are both less than 2 mm, which greatly reduces the dead angle of heat exchange and is conducive to the uniformity of heat exchange.
[0015] (2) The interior of the shell is divided into N+1 areas by N rows of baffles. Each heat exchange area has an inlet and an outlet, so that the heat exchange medium can evenly fill the walls of the heat exchange tubes, thereby eliminating the lateral temperature difference of the material after leaving the heat exchange tubes and ensuring the radial temperature difference of the material leaving the heat exchanger is stable, thereby making the temperature of the system more uniform, reducing the occurrence of side reactions, and facilitating the stability of product quality;
[0016] (3) The diameters of the heat exchange tubes in the tube bundle area from the center to the outer ring increase successively, which not only increases the heat exchange area of the heat exchange tubes from the center to the outer ring, thereby facilitating the uniformity of heat exchange in different tube bundle areas, but also ensures that the material flow rate from the center to the outer ring is consistent, thereby ensuring that the material can flow from the upper part of the heat exchange tube to the lower part at the same time, thereby ensuring that the radial temperature difference of the material out of the heat exchanger is stable;
[0017] (4) The structure of the utility model minimizes the impact of the internal components in the reactor on product quality;
[0018] (5) A baffle is provided at each entrance of the heat exchanger to buffer the entry of the heat exchange medium, appropriately reduce the flow rate of the heat exchange medium entering, and also guide the flow of the heat exchange medium;
[0019] (6) The included angles between the inlets of two adjacent rows of heat exchange areas and the outlets of two adjacent rows of heat exchange areas are both 90°. This arrangement allows the heat exchange medium to evenly fill the space between the walls of the heat exchange tubes, making the temperature inside the heat exchanger uniform. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0021] Figure 2 It is an arrangement diagram of the inlet and outlet, and the heat exchange tubes of the utility model.
[0022] In the figure:
[0023] 1. Shell, 2. Baffle, 3. Heat exchange tube, 4. Flange, 5. Baffle. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0026] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0027] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.
[0028] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0029] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.
[0030] This embodiment is described by taking three rows of baffles 2 as an example.
[0031] like Figures 1 to 2 As shown, a heat exchanger includes a shell 1, a baffle 2 and a plurality of heat exchange tubes 3 arranged in parallel. The baffle 2 is adapted to the shape of the shell 1. The baffle 2 is provided with a plurality of holes for the heat exchange tubes 3 to pass through. The three rows of baffles 2 are arranged perpendicular to the heat exchange tubes 3 and the baffles 2 divide the interior of the shell 1 into four heat exchange areas. Each heat exchange area has an inlet and an outlet. Figure 1 As shown, in this embodiment, the inlet is ADEH, the outlet is BCFG, the gap between the baffle 2 and the inner wall of the shell 1 and the gap between the hole on the baffle 2 and the outer wall of the heat exchange tube 3 are both less than 2 mm, and the smaller the gap, the better, the smaller the heat exchange dead angle, and the more conducive to the uniformity of heat exchange.
[0032] In one embodiment, both ends of the heat exchange tube 3 are connected to the shell 1 through flanges 4. The flanges 3 not only serve as fastening devices to ensure a firm connection between the heat exchange tube 3 and the shell 1, but also effectively prevent leakage of the working medium during the heat exchange process through its sealing performance, thereby ensuring the safe and stable operation of the heat exchange system. This connection method not only strengthens the integrity of the structure, but also promotes an efficient and continuous heat exchange process between the heat exchange tube 3 and the shell 1, so that heat can be smoothly transferred between the two, thereby realizing the conversion and utilization of thermal energy.
[0033] In one embodiment, the number N of rows of baffles 2 is 1-10, and the optimal number of rows is 3-6.
[0034] In one embodiment, the spacing between two adjacent rows of baffles 2 is 100-600 mm, and the optimal spacing is 300-500 mm.
[0035] In one embodiment, in order to achieve optimal heat exchange uniformity, the number of turns of the heat exchange tube 3 in the center tube bundle area is 2 to 10, and the optimal number is 3 to 5. The number of turns of the heat exchange tube 3 in the outermost tube bundle area is 1 to 4, and the optimal number is 2.
[0036] In one embodiment, since the temperature of the heat exchange medium in the central area of the shell 1 is lower than that of the heat exchange medium in the outer circle, and the flow rate of the material in the central area is greater than that in the outer circle, this causes inconsistent residence time of the material in the heat exchanger. Therefore, the heat exchange tube 3 is divided into at least three tube bundle areas from the center to the outer circle, and the diameter of the heat exchange tube 3 in the tube bundle area from the center to the outer circle increases successively. Specifically, the diameter of the heat exchange tube 3 in the tube bundle area from the center to the outer circle increases successively by 10 to 30 mm. For example, in this embodiment, the diameter of the innermost 5 circles of heat exchange tubes 3 is 40 mm, the diameter of the middle layer of heat exchange tubes 3 is 50 mm, and the diameter of the outermost two circles of heat exchange tubes 3 is 65 mm. Through the setting of such tube diameter size, the heat exchange area of the outer circle is larger than the heat exchange area of the central area, which is beneficial to the uniformity of heat exchange in different tube bundle areas. At the same time, it can also ensure the consistency of the material flow rate from the center to the outer circle, thereby ensuring the consistency of the material residence time in the heat exchange tube 3, thereby ensuring the stability of the radial temperature difference of the material out of the heat exchanger, making the polymerization reaction rate consistent, and improving the quality of the product.
[0037] In one embodiment, a baffle 5 is provided at each inlet to buffer the entry of the heat exchange medium, appropriately reduce the flow rate of the heat exchange medium entering, and also guide the flow of the heat exchange medium.
[0038] In one embodiment, Figure 2 As shown, the included angles between the inlets of two adjacent rows of heat exchange areas and the outlets of two adjacent rows of heat exchange areas are both 90°. This arrangement enables the heat exchange medium to evenly fill the walls of the heat exchange tubes 3, making the temperature inside the heat exchanger uniform.
[0039] The above are preferred implementation modes of the present invention. Technicians in the field to which the present invention belongs can also change and modify the above implementation modes. Therefore, the present invention is not limited to the above specific implementation modes. Any obvious improvements, substitutions or modifications made by technicians in this field on the basis of the present invention belong to the protection scope of the present invention.
Claims
1. A heat exchanger, comprising a shell (1), a baffle (2) and a plurality of heat exchange tubes (3) arranged in parallel, characterized in that: The N rows of baffles (2) are arranged perpendicular to the heat exchange tubes (3), and the baffles (2) divide the interior of the shell (1) into N+1 heat exchange areas, each of the heat exchange areas having an inlet and an outlet; and the gap between the baffles (2) and the inner wall of the shell (1) and the outer wall of the heat exchange tube (3) is less than 2 mm.
2. The heat exchanger according to claim 1, characterized in that: Both ends of the heat exchange tube (3) are connected to the shell (1) via flanges (4).
3. The heat exchanger according to claim 1, characterized in that: The number N of rows of the baffles (2) is 1 to 10.
4. The heat exchanger according to claim 1, characterized in that: The distance between two adjacent rows of baffles (2) is 100 to 600 mm.
5. The heat exchanger according to claim 1, characterized in that: The heat exchange tube (3) is divided into at least three tube bundle areas from the center to the outer ring, and the tube diameters of the heat exchange tubes (3) in the tube bundle areas from the center to the outer ring increase successively.
6. The heat exchanger according to claim 5, characterized in that: The diameters of the heat exchange tubes (3) in the tube bundle area from the center to the outer ring increase by 10 to 30 mm.
7. The heat exchanger according to claim 5, characterized in that: The number of turns of the heat exchange tube (3) in the center tube bundle area is 2 to 10, and the number of turns of the heat exchange tube (3) in the outermost tube bundle area is 1 to 4.
8. The heat exchanger according to claim 1, characterized in that: A baffle (5) is provided at the inlet.
9. The heat exchanger according to claim 1, characterized in that: The included angles of the inlets of the heat exchange regions in two adjacent rows and the outlets of the heat exchange regions in two adjacent rows are both 90°.