Tubular heat exchanger for chemical production

Abstract

The utility model discloses a tubular heat exchanger for chemical production, which comprises a heat exchange component, a tube shell is wrapped outside the heat exchange component, the heat exchange component comprises a plurality of heat exchange tubes and auxiliary tube plates assembled at two ends of the heat exchange tubes, a plurality of through holes are uniformly arranged on the auxiliary tube plates, and the end parts of the heat exchange tubes are inserted into the through holes of the auxiliary tube plates. The end of the heat exchange tube is flush with the surface of the auxiliary tube plate, a plurality of tube folding plates are connected to the heat exchange tube in a sleeving mode, each tube folding plate is of a semicircular structure, and the tube folding plates are arranged in a staggered mode in the notch direction of the heat exchange tube. According to the heat exchange assembly, the multiple tube folding plates are connected to the heat exchange tubes in a sleeving mode, when the heat exchange assembly is assembled into the tube shell, the outer sides of the tube folding plates abut against the inner wall of the tube shell, the tube folding plates play a role in fixing the heat exchange tubes firstly, so that certain gaps exist between the heat exchange tubes, and when the tube shell is filled with liquid, the liquid can make full contact with the heat exchange tubes; and meanwhile, the flow speed of liquid in the tube shell can be slowed down through the tube folding plates.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchangers for chemical industry, in particular to a shell and tube heat exchanger for chemical production. Background Art

[0002] At present, the shell-and-tube heat exchangers in operation in industrial production are basically all cold and hot fluids flowing on both sides of the tubes, and heat exchange is carried out through the tube wall. In order to improve the heat transfer rate of the shell-and-tube heat exchanger and increase its production intensity, people have invested a lot of time and energy in exploration and research. For example, many methods such as adding fins on the inner and outer surfaces of the tubes and adding guide plates inside the tubes have improved the flow state of cold and hot fluids inside and outside the tubes to a certain extent, increased the heat transfer rate, and achieved certain results.

[0003] Chinese patent CN103090698A discloses a shell-and-tube heat exchanger for an electrolytic cell. By winding a disc-shaped shell and tube outside the straight tube, the contact surface between the heat exchange medium and the shell and tube is increased and the length of the shell and tube is lengthened, thereby improving the heat exchange efficiency of the heat exchanger.

[0004] In the prior art, in order to improve the heat transfer effect, attempts are often made to increase the contact area between the pipe and the liquid. Since the space between the tube and the shell is limited, the usual method is to increase the diameter of the heat exchange tube or add additional heat dissipation components to the heat exchange tube to expand the contact area. However, this approach will inevitably lead to a reduction in the internal space of the tube shell, thereby reducing the amount of liquid that can be input into the tube shell, and ultimately reducing the heat exchange efficiency to a certain extent. Utility Model Content

[0005] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] In order to solve the problems existing in the above-mentioned background technology, the utility model adopts the following technical solutions.

[0007] A shell-and-tube heat exchanger for chemical production comprises a heat exchange component, a tube shell is wrapped on the outside of the heat exchange component, the heat exchange component comprises a plurality of heat exchange tubes and auxiliary tube sheets assembled on both ends of the heat exchange tubes, a plurality of through holes are evenly opened on the auxiliary tube sheets, and the ends of the heat exchange tubes are inserted into the through holes of the auxiliary tube sheets, the ends of the heat exchange tubes are kept flush with the surface of the auxiliary tube sheets, a plurality of folded tube sheets are sleeved on the heat exchange tubes, the folded tube sheets are provided with semicircular notches, and when the plurality of folded tube sheets are sleeved on the heat exchange tubes, the positions of the semicircular notches on adjacent folded tube sheets are opposite.

[0008] Preferably, gaps are formed between the plurality of heat exchange tubes through the constraints of the auxiliary tube sheets and the folded tube sheets, the heat exchange tubes are cast from corrosion-resistant materials, and copper films are electroplated inside the heat exchange tubes.

[0009] Preferably, when the heat exchange assembly is assembled inside the tube shell, the outer sides of the auxiliary tube sheet and the folded tube sheet abut against the inner wall of the tube shell, wherein the outer surface of the auxiliary tube sheet is flush with the end surface of the tube shell.

[0010] Preferably, pipeline flanges are welded to the sides of the tube shell near both ends, and the pipeline flanges are connected to the external pipeline system, one of the pipeline flanges is the liquid input port, and the other pipeline flange is the liquid output port.

[0011] Preferably, both end faces of the tube shell are equipped with fixed tube sheets, and connecting holes are evenly opened on the fixed tube sheets. When the fixed tube sheets are assembled on the tube shell, they fit with the auxiliary tube sheets, and the positions of the connecting holes correspond to the positions of the through holes opened on the auxiliary tube sheets.

[0012] Preferably, the inner diameter of the connecting hole on the fixed tube sheet is equal to that of the through hole on the auxiliary tube sheet, and a socket is welded on the lower surface of the connecting hole, and the outer diameter of the socket is equal to the inner diameter of the connecting hole. When the fixed tube sheet and the auxiliary tube sheet are fitted together, the socket is inserted into the through hole on the auxiliary tube sheet.

[0013] Preferably, the ends of the tube shell and the outer side of the fixed tube plate are provided with fixed flanges, and the tube shell and the fixed tube plate are connected through the fixed flanges. A head is provided on the upper surface of the fixed tube plate, a cover plate is attached to the surface of the head, and fastening screws are provided between the head and the cover plate for connection.

[0014] Preferably, the head is a cylindrical structure with a hollow interior, and the side of the head connected to the fixed tube sheet protrudes inward to form a bucket shape, and a sleeve is provided at the center of the bucket-shaped structure, which passes through the cavity of the head and extends upward to form a connecting port.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] (1) In the present application, a plurality of folded tube plates are sleeved on the heat exchange tubes. When the heat exchange assembly is assembled into the tube shell, the outer side of the folded tube plates abuts against the inner wall of the tube shell. The folded tube plates firstly play a fixing role on the heat exchange tubes, so that there is a certain gap between each heat exchange tube. When the heat fluid is filled into the tube shell, it can fully contact the heat exchange tubes, thereby improving the heat exchange efficiency. At the same time, in order to enable the heat fluid in the tube shell to flow, the folded tube plates in the present application are provided with semicircular notches. The positions of the semicircular notches on adjacent folded tube plates are opposite. The plurality of folded tube plates actually form a circuitous structure, thereby slowing down the flow speed of the liquid in the tube shell, so that the liquid can have sufficient time to transfer heat with the heat exchange tubes, further improving the heat exchange efficiency.

[0017] (2) The heat exchanger in the present application is a detachable structure to facilitate subsequent cleaning. In order to ensure the sealing of the heat exchange tubes, the present application sets auxiliary tube sheets at both ends of the heat exchange tubes so that the ends of the heat exchange tubes can remain fixed. When the heat exchange medium is injected into the heat exchange tubes, the constraints of the auxiliary tube sheets can effectively prevent the shaking of the ends of the heat exchange tubes due to the water hammer effect. At the same time, a fixed tube sheet is attached to the surface of the auxiliary tube sheet to play a further sealing role. The fixed tube sheet can also play a diversion role to ensure that the heat exchange medium can evenly enter each heat exchange tube. The fixed tube sheet is connected to the tube shell through a fixed flange, and the gasket on the flange is used to further seal.

[0018] (3) The present application adds a head at the end of the tube shell, which not only seals the heat exchange component, but also promotes the heat exchange medium to diffuse effectively into the fixed tube sheet through the head. The side of the head connected to the fixed tube sheet is designed to be inwardly protruding. Such a structure is conducive to the diffusion of the heat exchange medium, ensuring that it will not only flow into the fixed tube sheet at the center of the head, but can evenly enter the heat exchange tube at the edge. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The three-dimensional structure of the tube-in-tube heat exchanger in the utility model Figure 1 .

[0020] Figure 2 It is a partial cross-sectional view of the shell and tube heat exchanger in the utility model.

[0021] Figure 3 The three-dimensional structure of the tube-in-tube heat exchanger in the utility model Figure 2 .

[0022] Figure 4 It is a three-dimensional structural diagram of the heat exchange component in the utility model.

[0023] Figure 5 This is a sealing structure diagram of the heat exchange component in the utility model.

[0024] The corresponding relationship between the illustrations and component names in the figure is as follows:

[0025] 1. Tube shell; 11. Pipe flange; 12. Fixed flange; 13. Cover plate; 14. Fastening screws; 2. Head; 21. Casing; 22. Fixed tube sheet; 3. Heat exchange assembly; 31. Heat exchange tube; 32. Folded tube sheet; 33. Auxiliary tube sheet. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. The present invention provides the following embodiments.

[0029] See also Figure 1 , Figure 1 : is a structural diagram of a shell-and-tube heat exchanger for chemical production in this embodiment. The shell-and-tube heat exchanger in this embodiment includes a heat exchange component 3. The outer surface of the heat exchange component 3 is wrapped with a tube shell 1 to form a main structure of the shell-and-tube heat exchanger. The heat exchange component 3 includes a plurality of heat exchange tubes 31 and auxiliary tube sheets 33 assembled at both ends of the heat exchange tubes 31. The plurality of heat exchange tubes 31 are sleeved through the auxiliary tube sheets 33 to form a tube bundle. Pipe flanges 11 are welded on the side of the tube shell 1 near both ends. The pipe flanges 11 are connected to the external pipeline system. One of the pipe flanges 11 is a liquid input port, and the other pipe flange 11 is a liquid input port. The flange 11 is a liquid outlet. When the hot fluid flows into the tube shell 1 through the pipe flange 11 of the liquid inlet, the hot fluid is transferred to the heat exchange medium in the tube through the tube wall of the heat exchange tube 31. Due to the temperature difference on both sides of the tube wall, heat is transferred from the high-temperature side to the low-temperature side. At the same time, the fluid inside and outside the tube generates convection due to the density difference, which further promotes heat exchange. The shell-and-tube heat exchanger of this structure has a simple and strong structure, can withstand high pressure and high temperature, and can adapt to different working media and working conditions. At the same time, the tube bundle of the shell-and-tube heat exchanger in this embodiment can be disassembled for easy cleaning and maintenance.

[0030] Figure 3: is a heat exchanger assembly structure diagram. In this embodiment, a plurality of through holes are evenly opened on the auxiliary tube sheet 33. The ends of the heat exchange tubes 31 are inserted into the through holes of the auxiliary tube sheet 33 to be fixed. In order to facilitate the sealing of the two ends of the heat exchange component 3, in this embodiment, the ends of the heat exchange tubes 31 are designed to be flush with the surface of the auxiliary tube sheet 33, so as to facilitate the assembly of other sealing components. Specifically, fixed tube sheets 22 are installed on the end faces of both ends of the tube shell 1, and fixed flanges 12 are provided on the ends of the tube shell 1 and the outer side of the fixed tube sheet 22. The tube shell 1 and the fixed tube sheet 22 are fixedly connected by the fixed flanges 12. When the fixed tube sheet 22 is fixedly connected to the tube shell 1 by the fixed flanges 12, the fixed tube sheet 22 and the auxiliary tube sheet 33 are attached. The auxiliary tube sheet 33 is pressed between the tube shell 1 and the fixed flange 12, and the outer surface of the auxiliary tube sheet 33 is flush with the end surface of the tube shell 1, so that the fixed flange 12 forms a compressive force to make the auxiliary tube sheet 33 fit closely with the heat exchange tube 31. The structures at both ends of the tube shell 1 are the same, so the pressure at both ends is balanced, so that the heat exchange tube 31, the fixed tube sheet 22 and the auxiliary tube sheet 33 fit closely, preventing the gap generated when the three are connected to cause leakage of the internal heat exchange medium. At the same time, in order to ensure that the heat exchange medium can smoothly enter the heat exchange tube 31, in this embodiment, connecting holes are evenly opened on the fixed tube sheet 22, and the opening position of the connecting hole on the fixed tube sheet 22 corresponds to the position of the through hole opened on the auxiliary tube sheet 33, thereby forming a channel for the heat exchange medium to flow.

[0031] See also Figure 2 In order to ensure sealing, in this embodiment, the connecting hole on the fixed tube sheet 22 is designed to be equal to the inner diameter of the through hole on the auxiliary tube sheet 33, and a socket is welded on the lower surface of the connecting hole, and the outer diameter of the socket is equal to the inner diameter of the connecting hole. In this embodiment, when the fixed tube sheet 22 and the auxiliary tube sheet 33 are fitted, the socket is inserted into the through hole on the auxiliary tube sheet 33. On the one hand, the fixed tube sheet 22 can be conveniently connected to the auxiliary tube sheet 33 by using the socket, and the fixed tube sheet 22 and the auxiliary tube sheet 33 can be prevented from being installed incorrectly by the socket. On the one hand, the socket can make up for the gap between the connecting hole and the through hole, which improves the sealing performance of the device to a certain extent; further, the present application provides a head 2 on the upper surface of the fixed tube sheet 22, and the surface of the head 2 is attached with a cover plate 13, and a fastening screw 14 is provided between the head 2 and the cover plate 13 for connection. On the one hand, the head 2 plays a role of sealing the heat exchange component, and at the same time, the heat exchange medium can also diffuse into the fixed tube sheet 22 through the head 2, and the cover plate 13 plays a role of protecting the head 2.

[0032] Figure 5It is a cross-sectional view of the head 2 and the fixed tube sheet 22 in this embodiment. The head 2 in this embodiment is a cylindrical structure with a hollow interior, and the side of the head 2 connected to the fixed tube sheet 22 protrudes inward to form a bucket shape, so that the heat exchange medium can be better diffused, avoiding the heat exchange medium only existing in the center of the head 2 and flowing into the fixed tube sheet 22 after injection, causing the heat exchange medium to be unable to enter the heat exchange tube 31 at the edge, and in order to better connect the device with the pipeline for inputting the heat exchange medium, the present application is provided with a sleeve 21 at the center of the bucket-shaped structure, and the sleeve 21 passes through the cavity of the head 2 and extends upward to form a connecting port.

[0033] Figure 4 The heat exchange assembly 3 is a schematic diagram of the structure. In order to allow the hot fluid to have sufficient time to exchange heat with the heat exchange medium inside the heat exchange tube 31 during the flow of the hot fluid in the tube shell 1, the present embodiment is provided with a plurality of folded tube plates 32 on the heat exchange tube 31. The folded tube plates 32 firstly play a role in fixing the heat exchange tube 31, and cooperate with the auxiliary tube plates 33 to ensure that there is a certain gap between the heat exchange tubes 31. When the hot fluid is filled into the tube shell 1, it can fully contact with the heat exchange tube 31, thereby improving the heat exchange efficiency. At the same time, in order to allow the liquid in the tube shell 1 to flow, the folded tube plates in the present application A semicircular notch is provided on 32, and when multiple folded tube plates 32 are sleeved on the heat exchange tube 31, the positions of the semicircular notches on adjacent folded tube plates 32 are opposite, so that the multiple folded tube plates 32 form a circuitous structure in the tube shell 1, which slows down the flow rate of the liquid in the tube shell 1, so that the liquid can have enough time to transfer heat with the heat exchange tube 31, thereby further improving the heat exchange efficiency. Furthermore, in order to increase the service life of the heat exchange tube 31, the present application casts the heat exchange tube 31 with a corrosion-resistant material during actual manufacturing, and in order to ensure heat transfer, a copper film is electroplated inside the heat exchange tube 31.

[0034] It should be noted that in order to effectively utilize the folded tube plate 32 to slow down the flow rate of the liquid in the tube shell 1, when the heat exchange component 3 in the present application is assembled inside the tube shell 1, the auxiliary tube plate 33 and the outer side of the folded tube plate 32 abut against the inner wall of the tube shell 1, so that a semi-closed structure is formed between two adjacent folded tube plates 32, so that the hot fluid in the tube shell 1 can only flow through the semicircular notch of the folded tube plate 32, and the flow rate of the hot fluid is slowed down by the staggered arrangement of the folded tube plates 32.

[0035] In summary, in the actual use of the shell-and-tube heat exchanger in this embodiment, one of the pipe flanges 11 on the tube shell 1 is connected to the external pipe as the hot fluid input end, and the hot fluid enters the inside of the tube shell 1 through the pipe flange 11. The synchronous heat exchange medium pipe is connected to the device through the sleeve 21 protruding outward on the head 2. The heat exchange medium enters the device through the head 2 and is dispersed by the auxiliary tube sheet 33 and then flows into each heat exchange tube 31. In this process, the hot fluid in the tube shell 1 exchanges heat with the heat exchange medium in the heat exchange tube 31, and the temperature of the hot fluid after the exchange drops and is discharged from the tube shell 1. When the hot fluid flows in the tube shell 1, it will be blocked by the folded tube plate 32 arranged on the heat exchange component 3, thereby slowing down the flow speed of the hot fluid to a certain extent, ensuring that the hot fluid and the heat exchange medium have sufficient heat exchange time. The heat exchange medium in the heat exchange tube 31 increases its temperature after heat exchange with the hot fluid and is discharged through the other end of the tube shell 1. The above process realizes a single heat exchange. In actual use, the flow rate and flow rate of the hot fluid and the heat exchange medium are controlled by the valve on the pipeline to ensure the efficiency of heat exchange at the optimal speed.

[0036] The above content is a further detailed description of the utility model in combination with specific implementation methods. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make several simple deductions or substitutions, which should be regarded as belonging to the scope of protection determined by the claims submitted for the utility model.

Claims

1. A shell-and-tube heat exchanger for chemical production, comprising a heat exchange component (3), wherein a tube shell (1) is wrapped outside the heat exchange component (3), Features: The heat exchange assembly (3) comprises a plurality of heat exchange tubes (31) and auxiliary tube sheets (33) mounted at both ends of the heat exchange tubes (31); a plurality of through holes are evenly opened on the auxiliary tube sheets (33); the ends of the heat exchange tubes (31) are inserted into the through holes of the auxiliary tube sheets (33); the ends of the heat exchange tubes (31) are kept flush with the surface of the auxiliary tube sheets (33); a plurality of folded tube sheets (32) are sleeved on the heat exchange tubes (31); the folded tube sheets (32) are provided with semicircular notches; and when the plurality of folded tube sheets (32) are sleeved on the heat exchange tubes (31), the semicircular notches on adjacent folded tube sheets (32) are located at opposite positions.

2. A shell-and-tube heat exchanger for chemical production according to claim 1, characterized in that: Gaps are formed between the plurality of heat exchange tubes (31) through the constraints of the auxiliary tube sheet (33) and the folded tube sheet (32); the heat exchange tube (31) is cast from a corrosion-resistant material, and a copper film is electroplated inside the heat exchange tube (31).

3. A shell and tube heat exchanger for chemical production according to claim 2, characterized in that: When the heat exchange assembly (3) is assembled inside the tube shell (1), the outer sides of the auxiliary tube sheet (33) and the folded tube sheet (32) abut against the inner wall of the tube shell (1), wherein the outer surface of the auxiliary tube sheet (33) is flush with the end face of the tube shell (1).

4. A shell-and-tube heat exchanger for chemical production according to claim 3, characterized in that: Pipe flanges (11) are welded to the sides of the tube shell (1) near both ends. The pipe flanges (11) are connected to an external pipe system. One of the pipe flanges (11) is a liquid input port, and the other pipe flange (11) is a liquid output port.

5. The shell-and-tube heat exchanger for chemical production according to claim 1, characterized in that: The end surfaces of both ends of the tube shell (1) are equipped with fixed tube sheets (22), and the fixed tube sheets (22) are evenly provided with communication holes. When the fixed tube sheets (22) are assembled on the tube shell (1), they fit with the auxiliary tube sheets (33), and the positions of the communication holes correspond to the positions of the through holes provided on the auxiliary tube sheets (33).

6. A shell-and-tube heat exchanger for chemical production according to claim 5, characterized in that: The inner diameters of the communicating hole on the fixed tube sheet (22) and the through hole on the auxiliary tube sheet (33) are equal, and a socket is welded on the lower surface of the communicating hole, the outer diameter of the socket is equal to the inner diameter of the communicating hole, and when the fixed tube sheet (22) and the auxiliary tube sheet (33) are fitted together, the socket is inserted into the through hole on the auxiliary tube sheet (33).

7. A shell-and-tube heat exchanger for chemical production according to claim 6, characterized in that: The end of the tube shell (1) and the outer side of the fixed tube sheet (22) are both provided with a fixing flange (12), and the tube shell (1) and the fixed tube sheet (22) are connected via the fixing flange (12). A head (2) is provided on the upper surface of the fixed tube sheet (22), a cover plate (13) is attached to the surface of the head (2), and a fastening screw (14) is provided between the head (2) and the cover plate (13) for connection.

8. A shell-and-tube heat exchanger for chemical production according to claim 7, characterized in that: The end cap (2) is a cylindrical structure with a hollow interior, and the side of the end cap (2) connected to the fixed tube sheet (22) protrudes inwardly to form a bucket shape, and a sleeve (21) is provided at the center of the bucket-shaped structure, and the sleeve (21) passes through the cavity of the end cap (2) and extends upward to form a connection port.

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