Heat exchanger

Abstract

The utility model discloses a heat exchanger, which belongs to the technical field of heat exchange equipment and comprises a flow channel component, the flow channel component comprises a barrel and a baffle plate, and a shell pass inlet connecting pipe of the barrel is communicated with a main line pipe; the flushing pipe assembly comprises a main pipe and a tail end flushing mechanism, the main pipe is used for providing cleaning fluid needed by flushing for the tail end flushing mechanism, and the tail end flushing mechanism is arranged at the root flowing dead zone of the baffle plate and sprays the cleaning fluid conveyed by the main pipe out of the root flowing dead zone of the baffle plate; the heat exchanger can fully disturb shell pass fluid in a flowing dead zone at the root of the baffle plate, the impurity settling rate is reduced, the self-cleaning function of the heat exchanger in the operation process is achieved to a certain extent, and the equipment cleaning period is prolonged; the shell pass fluid stagnation at the root of the baffle plate is reduced, the heat exchange area of the heat exchange tube is fully utilized, the heat exchange dead zone is reduced, and the effective heat exchange capacity of the heat exchanger is enhanced.

Description

Technical Field

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

[0002] A heat exchanger is a very important device in the chemical production process, which plays the role of heat exchange between hot and cold fluids. According to statistics, heat exchangers account for more than 20% of the total equipment investment, and are the key equipment for realizing the optimization of chemical processes and heat exchange networks. The efficiency, safety and reliability of heat exchangers directly affect the normal operation of chemical production.

[0003] Traditional fixed tube sheet shell and tube heat exchangers account for a large proportion in the field of heat exchangers due to their simple structure and strong universality; traditional shell and tube heat exchangers have a shell and heat exchange tubes. Among them, the heat exchange tubes are arranged side by side and at intervals in the shell; a shell side is formed between the shell and the heat exchange tubes, and the inside of the heat exchange tubes is the tube side; high-temperature and low-temperature media are respectively in the shell side and the tube side, and then the heat exchange of the two media is completed. In order to improve the heat exchange efficiency, segmental baffles are arranged in the shell, and the medium in the shell side reciprocates between several baffles, fully contacting the heat exchange tubes, and fully exchanging heat with the medium in the heat exchange tubes through the wall surface of the heat exchange tubes. Due to the existence of a flow dead zone (stagnant flow zone, also a heat exchange dead zone) at the root of the baffle, the wall surface of the heat exchange tube at this position cannot effectively participate in heat exchange, and at the same time, impurity sedimentation causes the heat exchange effect of the heat exchanger to deteriorate further, and even causes the heat exchanger to be blocked or under-deposit corrosion and other problems over time. Conventional circulating cleaning has little effect on cleaning the position at the root of the baffle of the fixed tube sheet heat exchanger. At present, the shell side cleaning of the shell and tube heat exchanger mostly adopts a detachable structure. After the tube bundle is taken out as a whole, it is flushed with a high-pressure water gun. However, the detachable structure of the tube bundle is more complex, adding components such as shell flanges, resulting in a sharp increase in the equipment cost.

[0004] At present, the patent with the application number CN201810323607.1 discloses a baffle assembly. By opening holes in the baffle and installing a jet nozzle, using the pressure difference between the fluids on both sides of the baffle, the disturbance of the fluid on the back of the baffle is realized. To a certain extent, the fluid flow on the back of the baffle can be improved, and the impurity deposition rate can be reduced; however, this structure has the following problems: First, since the pressure difference between the two sides of the baffle is very small, the fluid disturbance effect is very limited; second, if a better disturbance effect is desired, the fluid passing through the nozzle will account for a relatively large proportion, which has a weakening effect on the heat exchange effect of the heat exchanger, and this is a fluid short-circuit situation that needs to be avoided in heat transfer design; third, the opening of the baffle will increase the tube layout pitch of the heat exchange tubes, reduce the utilization rate of the tube sheet, and reduce the heat exchange area per unit volume of the heat exchanger, resulting in a reduction in the heat exchange capacity of the equipment.

[0005] Therefore, it is urgent to develop a heat exchanger to solve the problems such as poor heat exchange effect in the flow dead zone at the root of the baffle and blockage of the heat exchanger caused by impurity sedimentation. Utility Model Content

[0006] In response to the problems existing in the prior art, the utility model provides a heat exchanger that can fully disturb the fluid in the dead zone of flow at the root of the baffle, reduce the impurity sedimentation rate, and to a certain extent realize the self-cleaning function of the heat exchanger during operation, extend the equipment cleaning cycle, and enhance the heat transfer effect.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] The utility model provides a heat exchanger, including a flow channel component, the flow channel component includes a cylinder and a baffle, the shell side inlet pipe of the cylinder is connected to a main line pipe; and also includes a flushing pipe component: the flushing pipe component includes a main pipe and a terminal flushing mechanism, the main pipe is used to provide the terminal flushing mechanism with a cleaning fluid required for flushing, the terminal flushing mechanism is arranged at the flow dead zone at the root of the baffle, and the cleaning fluid transported by the main pipe is sprayed out at the flow dead zone at the root of the baffle.

[0009] As a preferred technical solution, the main pipe is connected to the main line pipe or the cleaning fluid supply device;

[0010] And / or, a pressurizing component is provided on the main pipe;

[0011] And / or, the end flushing mechanism further comprises a nozzle, through which fluid is sprayed toward the dead zone at the root of the baffle.

[0012] As a preferred technical solution, the end flushing mechanism includes a coil connecting pipe and a plurality of coils, wherein the coils are arranged at the flow dead zone at the root of the baffle; a plurality of first spray holes are opened on the tube wall of the coils, and the plurality of first spray holes are distributed along the length of the coils; the coil connecting pipe is connected to each of the coils in the cylinder, and the main pipe is connected to the coils or the coil connecting pipe.

[0013] As a preferred technical solution, the coil is fixed on the outer circumferential surface of the baffle;

[0014] And / or, the coil is fixed to the baffle by welding, and the weld is a fillet weld;

[0015] And / or, the coil is a round tube or a flat tube;

[0016] And / or, the length of the coil is greater than or equal to the length of the outer circumferential surface corresponding to the baffle notch;

[0017] And / or, the outer circumferential surface of the baffle has a first avoidance portion, and the coil is located in the first avoidance portion.

[0018] As a preferred technical solution, the end flushing mechanism includes a flushing pipe located inside the cylinder body; a plurality of second spray holes are machined on the pipe wall of the flushing pipe, and the plurality of second spray holes are distributed in the length direction of the flushing pipe; the flushing pipe is communicated with the main pipe, and cleaning fluid is sprayed through the second spray holes to the flow dead zone at the root of the baffle plate.

[0019] As a preferred technical solution, the flushing pipe is a straight pipe extending along the axial direction of the cylinder body; a flushing pipe installation hole is provided on the baffle plate, and the flushing pipe is installed in the flushing pipe installation hole;

[0020] And / or, the density of the second spray holes decreases as the distance from the baffle plate increases.

[0021] As a preferred technical solution, the end flushing mechanism includes a guide plate located inside the cylinder body. The guide plate and the inner wall of the cylinder body enclose a cleaning channel; a gap is provided between the side edge of the guide plate and the inner wall of the cylinder body to form a spray outlet for spraying the cleaning fluid.

[0022] As a preferred technical solution, a second avoidance portion is provided on the baffle plate, and the guide plate is located inside the second avoidance portion;

[0023] And / or, the spray outlet is strip-shaped and extends along the entire length of the guide plate;

[0024] And / or, the guide plate is an arc-shaped plate, and its concave surface faces the cleaning channel.

[0025] As a preferred technical solution, the end flushing mechanism includes a direct injection pipe. One end of the direct injection pipe is communicated with the main pipe, and the other end passes through the cylinder wall of the cylinder body and extends into the cylinder body to spray cleaning fluid to the flow dead zone at the root of the baffle plate.

[0026] As a preferred technical solution, the end of the direct injection pipe located inside the cylinder body is blocked, and a plurality of third spray holes are opened on the pipe wall;

[0027] And / or, a third avoidance portion is provided at the bottom of the baffle plate to avoid the direct injection pipe.

[0028] The beneficial effects of the present utility model are manifested in:

[0029] The heat exchanger of the present application has a flushing pipe assembly, which can fully disturb the shell-side fluid in the flow dead zone at the root of the baffle plate, reduce the impurity sedimentation rate, and to a certain extent realize the self-cleaning function of the heat exchanger during operation, extend the equipment cleaning cycle; reduce the stagnation of the shell-side fluid at the root of the baffle plate, make full use of the heat exchange area of the heat exchange tubes, reduce the heat exchange dead zone, and enhance the effective heat exchange capacity of the heat exchanger.

[0030] The heat exchanger has a wide range of applications. There are multiple options for the end flushing mechanism, with flexible options that effectively reduce the difficulty of processing and manufacturing. At the same time, the flushing scheme can be selected according to the conditions of the production site. For example, a bypass can be opened in the main pipeline, and the existing shell-side fluid can be used as the cleaning fluid; or a booster pump can be installed on the main pipe to enhance the flushing ability, or a fresh material can be introduced as the cleaning fluid scheme, etc., which is convenient for the user to operate. Brief Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the heat exchanger of the present invention;

[0032] Figure 2 It is a schematic diagram of the structure of the flushing pipe assembly in the first embodiment of the heat exchanger of the present invention;

[0033] Figure 3 It is a schematic diagram of the first implementation scheme of the assembled structure of the coil pipe and the baffle plate in the first embodiment of the heat exchanger of the present invention;

[0034] Figure 4 It is a schematic diagram of the second implementation scheme of the assembled structure of the coil pipe and the baffle plate in the first embodiment of the heat exchanger of the present invention;

[0035] Figure 5 It is a schematic diagram of the welding structure between the coil pipe and the baffle plate when the coil pipe adopts a round pipe in the first embodiment of the heat exchanger of the present invention;

[0036] Figure 6 It is a schematic diagram of the welding structure between the coil pipe and the baffle plate when the coil pipe adopts a flat pipe in the first embodiment of the heat exchanger of the present invention;

[0037] Figure 7 It is a schematic diagram of the overall structure of the second embodiment of the heat exchanger of the present invention;

[0038] Figure 8 It is a schematic diagram of the structure of the flushing pipe in the second embodiment of the heat exchanger of the present invention;

[0039] Figure 9 It is a schematic diagram of the structure of the flushing pipe installation hole in the second embodiment of the heat exchanger of the present invention;

[0040] Figure 10 It is a schematic diagram of the overall structure of the third embodiment of the heat exchanger of the present invention;

[0041] Figure 11 It is a schematic diagram of the structure of the second avoidance part in the third embodiment of the heat exchanger of the present invention;

[0042] Figure 12 It is a schematic diagram of the overall structure of the fourth embodiment of the heat exchanger of the present invention;

[0043] Figure 13 This is a schematic diagram of the assembly structure of the baffle plate and the direct injection pipe in the fourth embodiment of the heat exchanger of the present utility model;

[0044] Figure 14 This is a schematic diagram of the structure of the nozzle in the heat exchanger of the present utility model;

[0045] Figure 15 This is a schematic diagram of the structure of the first embodiment of the nozzle in the heat exchanger of the present utility model;

[0046] Figure 16 This is a schematic diagram of the structure of the second embodiment of the nozzle in the heat exchanger of the present utility model.

[0047] In the figure:

[0048] 1 - Flow channel assembly; 11 - Tube sheet; 12 - Cylinder body; 13 - Upper baffle plate; 14 - Heat exchange tube; 15 - Lower baffle plate; 151 - First avoidance part; 152 - Flushing pipe installation hole; 153 - Second avoidance part; 154 - Third avoidance part; 155 - Baffle plate notch; 16 - Shell side inlet nozzle; 17 - Main pipe; 18 - Tube plate; 181 - Flushing hole; 19 - Shell side outlet nozzle;

[0049] 2 - Flushing pipe assembly; 21 - Main pipe; 22 - Coil connecting pipe; 23 - Coil; 231 - First spray hole; 24 - Flushing pipe; 241 - Second spray hole; 25 - Deflector; 26 - Direct injection pipe; 261 - Third spray hole; 27 - Nozzle; 271 - Injection hole; 28 - Nozzle. Specific embodiments

[0050] For the convenience of those skilled in the art to understand, the present utility model will be further described below with reference to the accompanying drawings.

[0051] Please refer to Figure 1, which is an embodiment of a heat exchanger provided by the present utility model, includes a flow channel assembly 1 for forming a tube side and a shell side. The flow channel assembly 1 is a prior art and includes two tube sheets 11, a cylinder 12, baffles, heat exchange tubes 14, and a main pipe 17. Among them, the two tube sheets 11 are respectively located at the left and right ends of the cylinder 12. Tube plates 18 are respectively provided at both ends of the cylinder 12, and the inner cavity of the cylinder 12 is separated from the two tube sheets 11 through the tube plates 18. The heat exchange tubes 14 are located inside the cylinder 12, and both ends of the heat exchange tubes 14 are respectively communicated with the two tube sheets 11; the fluid in the tube side flows into the heat exchange tubes 14 from one of the tube sheets 11 and flows out through the other tube sheet 11. A shell side inlet nozzle 16 and a shell side outlet nozzle 19 are provided on the cylinder 12; the baffle is located inside the cylinder 12 and is divided into an upper baffle 13 and a lower baffle 15. A lower medium flow channel is formed between the upper baffle 13 and the lower part of the inner wall of the cylinder 12; an upper medium flow channel is formed between the lower baffle 15 and the upper part of the inner wall of the cylinder 12. The shell side fluid in the main pipe 17 enters the cylinder 12 from the shell side inlet nozzle 16, flows through the lower medium flow channel and the upper medium flow channel, and finally flows out from the shell side outlet nozzle 19. In the following text, the flow dead zones of the shell side fluid at the roots of the upper baffle 13 and the lower baffle 15 are both referred to as the baffle root flow dead zones.

[0052] The heat exchanger further has a flushing pipe assembly 2 for sufficiently disturbing the shell side fluid in the baffle root flow dead zones and reducing the impurity sedimentation rate. The flushing pipe assembly 2 includes a main pipe 21 and an end flushing mechanism. The main pipe 21 is used to provide the cleaning fluid required for flushing to the end flushing mechanism; the end flushing mechanism is arranged in some or all of the baffle root flow dead zones as required, and sprays the cleaning fluid conveyed by the main pipe 21 in the baffle root flow dead zones, so as to form a disturbance in the baffle root flow dead zones, and can strengthen the heat exchange effect.

[0053] Among them, the end flushing mechanism can be correspondingly arranged in one or more baffle root flow dead zones corresponding to the upper baffle 13, or can be arranged in one or more baffle root flow dead zones corresponding to the lower baffle 15; the end flushing mechanism can also be arranged in all the baffle root flow dead zones of the heat exchanger; in actual application, the end flushing mechanism can be arranged as required. In the following text, for the sake of simplicity in explaining the structure of the end flushing mechanism, only the case where the end flushing mechanism is arranged in the baffle root flow dead zone corresponding to the lower baffle 15 is taken as an example for explanation, and the situation where the end flushing mechanism is arranged at the upper baffle 13 can be referred to the lower baffle 15.

[0054] As the first embodiment of the heat exchanger, reference can be made to Figures 1 - 14; The main pipe 21 is located outside the cylinder body 12. The main pipe 21 is communicated with the main pipeline 17 to introduce the fluid input into the cylinder body 12 into the main pipe 21 as the cleaning fluid; the main pipe 21 guides the cleaning fluid to the end flushing mechanism; thus, the cleaning fluid can be sprayed to the flow dead zone at the root of the baffle plate by using the pressure difference between the cleaning fluid and the shell-side fluid.

[0055] Alternatively, the main pipe 21 is communicated with a cleaning fluid supply device, and the cleaning fluid supply device is used to supply the cleaning fluid into the main pipe 21 to achieve the above-mentioned disturbance effect; thus, not only can the cleaning fluid supply device supply the cleaning fluid into the main pipe 21 after the heat exchanger is shut down for on-line cleaning of the heat exchanger, and specifically clean the flow dead zone position at the root of the baffle plate with the most precipitation, but also the cleaning effect is good; the cleaning fluid with a temperature different from that of the shell-side fluid can be supplied through the cleaning fluid supply device to adjust the local temperature of the heat exchanger and play a role in local temperature control. The cleaning fluid supply device can adopt a combination of an existing pump and a cleaning fluid box body. The cleaning fluid is stored in the box body, and a module for heating or cooling the cleaning fluid can be arranged in the box body. The pump is used to pump the cleaning fluid in the box body into the main pipe 21. This is the prior art, and the cleaning fluid supply device is not improved in this application, so it will not be described in detail. For example, if the shell-side fluid is circulating water, the cleaning fluid can be relatively clean tap water. The cleaning fluid strongly disturbs the fluid at the root of the baffle plate, and the impurities in the original circulating water are mixed into the shell-side fluid after being disturbed and are carried out of the heat exchanger, and are not easily deposited inside the equipment. While enhancing the heat exchange effect, the cleaning cycle of the equipment can be significantly extended.

[0056] The greater the pressure difference between the pressure at which the end flushing mechanism sprays the cleaning fluid and the flow dead zone at the root of the baffle plate, the faster the spraying flow rate and the better the disturbance effect. Preferably, a pressure boosting component, such as a booster pump, a booster valve, etc., is arranged on the main pipe 21 to increase the fluid pressure in the main pipe 21 and enhance the disturbance effect.

[0057] The main pipe 21 is located outside the cylinder body 12, while the end flushing mechanism is located inside the cylinder body 12. In order to achieve the connection between the two, as Figure 15 shown, a connecting pipe 28 can be arranged on the cylinder body 12. The connecting pipe 28 penetrates the cylinder wall and is adjacent to the tube sheet 18; the connecting pipe 28 is welded to both the cylinder body 12 and the tube sheet 18 to form a sealed connection to avoid leakage; or, as Figure 16 shown, a flushing hole 181 is machined in the tube sheet 18. The outer end of the flushing hole 181 is communicated with the main pipe 21 through the connecting pipe 28, and the inner end is directly communicated with the end flushing mechanism or communicated with the end flushing mechanism through a pipeline. The setting of the connecting pipe 28 can effectively reduce the processing difficulty of the heat exchanger. According to needs, the main pipe 21 and the end flushing mechanism can also be connected in other forms.

[0058] Please refer to Figures 1 - 6As an embodiment of the terminal flushing mechanism, the terminal flushing mechanism includes a coil connecting pipe 22 and a plurality of coils 23; the coil 23 is arranged in the dead zone of the flow at the root of the baffle, and a plurality of first spray holes 231 are opened on the tube wall of the coil 23, and the plurality of first spray holes 231 are distributed in the circumferential direction of the coil 23, preferably evenly distributed. The coil connecting pipe 22 is connected to each coil 23 in the cylinder 12, and the cleaning fluid is delivered to each coil 23. The main pipe 21 can be directly connected to the coil connecting pipe 22, and the cleaning fluid is delivered to each coil 23 through the coil connecting pipe 22; or the main pipe 21 can be connected to any one of the coils 23, and the fluid is then delivered to other coils 23 by the coil connecting pipe 22. The coil connecting pipe 22 does not have an outlet for spraying cleaning fluid outward, and can only transport the cleaning fluid to the coil 23, and spray it into the dead zone of flow at the root of the baffle of the cylinder 12 through the first spray hole 231 on the coil 23, causing a disturbance effect on the shell-side fluid in the dead zone of flow at the root of the baffle.

[0059] The coil 23 is fixed on the baffle or on the cylinder 12 corresponding to the dead zone of the baffle root; preferably, the coil 23 is fixed on the outer circumferential surface of the baffle. Figure 3 As shown, the coil 23 is welded to the outer circumferential surface of the lower baffle 15, and the weld is a fillet weld, which is firmly welded and enhances the stability of the coil 23 under fluid impact. The coil 23 can achieve a good fluid disturbance effect, and this structure can be used to assemble the heat exchange tube 14, changing the surface friction between the baffle and the cylinder 12 during the original tube bundle assembly to the line friction between the coil 23 and the inner wall of the cylinder 12, making assembly easier.

[0060] The length of the coil 23 can be adjusted as needed. The shorter the length, the less influence it has on the layout of the heat exchange tubes 14. However, the recommended length should not be less than the length of the outer circumferential surface corresponding to the baffle notch 155 to achieve a good turbulence effect. Figure 4 As shown, the outer circumferential surface of the baffle is partially concave to form a first avoidance portion 151, and the coil 23 is located in the first avoidance portion 151, which can reduce the influence of the coil 23 on the radial size of the baffle and also simplify the assembly structure of the baffle and the cylinder 12.

[0061] The coil 23 may be formed as follows: Figure 5 The round tube shown in the figure can also be made of Figure 6 The flat tubes shown; compared with the scheme using round tubes, in the scheme using flat tubes, the coil 23 occupies a smaller radial dimension of the baffle, and the baffles of the same diameter allow more heat exchange tubes 14 to be arranged, and the effective heat exchange area is larger.

[0062] As a second embodiment of the end flushing mechanism, please refer to Figures 7 - 9The end flushing mechanism includes a flushing pipe 24, which is located in the cylinder 12. A plurality of second spray holes 241 are processed on the pipe wall of the flushing pipe 24, and the plurality of second spray holes 241 are distributed in the length direction of the flushing pipe 24. The flushing pipe 24 is connected to the main pipe 21, and the cleaning fluid enters the flushing pipe 24 through the main pipe 21, and the other end of the flushing pipe 24 is closed; due to the pressure difference, the cleaning fluid will be sprayed to the dead zone of the flow at the root of the flow plate through the second spray holes 241, causing a disturbance effect on the fluid in the dead zone of the flow at the root of the flow plate.

[0063] Furthermore, the baffle is provided with a flushing pipe installation hole 152, and the flushing pipe 24 is located in the flushing pipe installation hole 152. The flushing pipe 24 can be a straight pipe extending along the axial direction of the cylinder 12; the shape of the flushing pipe 24 can also be set as required.

[0064] Furthermore, the density of the second spray hole 241 decreases as the distance from the baffle increases; the second spray hole 241 has a high density in the dead zone of flow near the root of the baffle, which can well disturb the dead zone of flow at the root of the baffle.

[0065] The flushing pipe 24 can not only form disturbance in the dead zone of flow at the root of the baffle, but also serve as a distance pipe of the heat exchanger. The flushing pipe 24 is welded to the baffle, and the flushing pipe 24 and the distance pipe are combined into one, which does not occupy the number of holes of the effective heat exchange tube 14 and has no effect on the heat exchange area of the heat exchanger.

[0066] Please refer to Figure 10 , Figure 11 As the third embodiment of the end flushing mechanism, the end flushing mechanism includes a guide plate 25, which is located inside the cylinder 12. The guide plate 25 and the inner wall of the cylinder 12 are not in close contact, but there is a gap, and the interior is surrounded by a cleaning channel for conveying the cleaning fluid; a gap is also provided between the side edge of the guide plate 25 extending along the length direction and the inner wall of the cylinder 12, and the gap constitutes a jet outlet for jetting the cleaning fluid. The jet outlet can be strip-shaped, extending over the entire length of the guide plate 25; for example, the two side edges of the guide plate 25 are not welded and fixed to the cylinder 12, and only the two ends of the guide plate 25 are fixed; the jet outlet is strip-shaped, which has a stronger disturbing effect on the fluid in the dead zone of the flow at the root of the baffle. Of course, the jet outlet can also be distributed in a point-like manner along the length direction of the guide plate 25 to form a structure similar to a hole.

[0067] The guide plate 25 can be a flat plate or a plate with any cross-sectional shape; preferably, it is an arc-shaped plate, with its inner concave surface facing the cleaning channel. In order to match the guide plate 25, a second avoidance portion 153 is provided on the baffle plate, and the second avoidance portion 153 is concave toward the baffle plate, and its shape is adapted to the side shape of the guide plate 25 away from the cylinder 12; for example, if the guide plate 25 is an arc-shaped plate, the second avoidance portion 153 is also arc-shaped.

[0068] Please refer toFigure 12 , Figure 13 , as the fourth embodiment of the end flushing mechanism, the end flushing mechanism includes a direct injection pipe 26. One end of the direct injection pipe 26 is communicated with the main pipe 21, and the other end passes through the barrel wall of the barrel 12 and extends into the barrel 12. The position of the direct injection pipe 26 corresponds to the position of the flow dead zone at the root of the baffle plate. The direct injection pipe 26 is fixedly and sealingly connected to the barrel wall of the barrel 12. The end of the direct injection pipe 26 located inside the barrel 12 is blocked, and a plurality of third spray holes 261 are formed on the pipe wall.

[0069] Furthermore, the part of the direct injection pipe 26 extending into the barrel 12 is a straight pipe. In order to adapt to the installation of the direct injection pipe 26, the baffle plate is provided with a third avoidance portion 154.

[0070] The cleaning fluid reaches the flow dead zone at the root of the baffle plate through the direct injection pipe 26. Since the end of the direct injection pipe 26 is closed, due to the pressure difference, the cleaning fluid will be sprayed into the flow dead zone at the root of the baffle plate through the third spray holes 261, causing a disturbance effect on the fluid in the flow dead zone at the root of the baffle plate. The greater the pressure difference, the faster the spraying flow rate, and the better the disturbance effect.

[0071] Furthermore, the end flushing mechanism further includes a nozzle 27. The nozzle 27 is configured to the first spray hole 231 or the second spray hole 241 or the third spray hole 261 as needed. By using the nozzle 27 in combination, the purpose of increasing the flow rate of the sprayed fluid, enhancing the fluid disturbance, and improving the shell-side turbulence effect is achieved, so as to enhance the heat exchange effect and the self-cleaning ability of the equipment. The structure of the nozzle 27 can refer to Figure 14 ; the fluid is sprayed into the flow dead zone at the root of the baffle plate through the multiple spray holes 271 on the nozzle 27. The nozzle 27 can also adopt other existing models and specifications of nozzles on the market as long as it can improve the spraying. The nozzle can be threadedly connected to the corresponding spray hole, or can be assembled and fixed by means of welding and other fixing methods.

[0072] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A heat exchanger, comprising a flow channel assembly (1), the flow channel assembly (1) including a cylinder body (12) and baffles, and a shell-side inlet nozzle (16) of the cylinder body (12) being communicated with a main pipe (17); characterized in that, It further includes a flushing pipe assembly (2): The flushing pipe assembly (2) includes a main pipe (21) and an end flushing mechanism. The main pipe (21) is used to supply the cleaning fluid required for flushing to the end flushing mechanism. The end flushing mechanism is arranged at the flow dead zone at the root of the baffle plate, and sprays the cleaning fluid conveyed by the main pipe (21) at the flow dead zone at the root of the baffle plate.

2. The heat exchanger according to claim 1, characterized in that, The main pipe (21) is communicated with the main line pipe (17) or the cleaning fluid supply device; and / or, a pressurizing component is arranged on the main pipe (21); and / or, the end flushing mechanism further includes a nozzle (27), and the fluid is sprayed to the flow dead zone at the root of the baffle plate through the nozzle (27).

3. The heat exchanger according to claim 1, characterized in that, The end flushing mechanism includes a coiled pipe connecting pipe (22) and a plurality of coiled pipes (23). The coiled pipes (23) are arranged at the flow dead zone at the root of the baffle plate; a plurality of first spray holes (231) are formed on the pipe wall of the coiled pipe (23), and the plurality of first spray holes (231) are distributed along the length of the coiled pipe (23); the coiled pipe connecting pipe (22) is communicated with each coiled pipe (23) in the cylinder body (12), and the main pipe (21) is communicated with the coiled pipe (23) or the coiled pipe connecting pipe (22).

4. A heat exchanger according to claim 3, characterized in that, The coiled pipe (23) is fixed on the outer circumferential surface of the baffle plate; and / or, the coiled pipe (23) is fixedly welded to the baffle plate, and the weld is a fillet weld; and / or, the coiled pipe (23) is a round pipe or a flat pipe; and / or, the length of the coiled pipe (23) is greater than or equal to the length of the outer circumferential surface corresponding to the baffle plate notch (155); and / or, the outer circumferential surface of the baffle plate has a first avoidance portion (151), and the coiled pipe (23) is located in the first avoidance portion (151).

5. A heat exchanger according to claim 1, characterized in that, The end flushing mechanism includes a flushing pipe (24). The flushing pipe (24) is located in the cylinder body (12); a plurality of second spray holes (241) are processed on the pipe wall of the flushing pipe (24), and the plurality of second spray holes (241) are distributed in the length direction of the flushing pipe (24); the flushing pipe (24) is communicated with the main pipe (21), and the cleaning fluid is sprayed to the flow dead zone at the root of the baffle plate through the second spray holes (241).

6. The heat exchanger according to claim 5, wherein, The flushing pipe (24) is a straight pipe and extends along the axial direction of the cylinder body (12); a flushing pipe installation hole (152) is arranged on the baffle plate, and the flushing pipe (24) is installed in the flushing pipe installation hole (152); and / or, the density of the second spray holes (241) decreases as the distance from the baffle plate increases.

7. A heat exchanger according to claim 1, wherein, The end flushing mechanism includes a guide plate (25). The guide plate (25) is located in the cylinder body (12), and the guide plate (25) and the inner wall of the cylinder body (12) enclose a cleaning channel; a gap is provided between the side edge of the guide plate (25) and the inner wall of the cylinder body (12), forming a spray outlet for the cleaning fluid to be sprayed.

8. A heat exchanger according to claim 7, wherein A second avoidance portion (153) is arranged on the baffle plate, and the guide plate (25) is located in the second avoidance portion (153); And / or, the jet outlet is strip-shaped and extends along the entire length of the deflector (25); And / or, the deflector (25) is an arc-shaped plate, and its concave surface faces the cleaning channel.

9. A heat exchanger according to claim 1, characterized in that, The end flushing mechanism includes a direct injection pipe (26). One end of the direct injection pipe (26) is communicated with the main pipe (21), and the other end passes through the wall of the cylinder body (12) and extends into the cylinder body (12) to inject cleaning fluid into the flow dead zone at the root of the baffle plate.

10. A heat exchanger according to claim 9, characterized in that, The end of the direct injection pipe (26) located inside the cylinder body (12) is blocked, and a plurality of third spray holes (261) are formed on the pipe wall; And / or, a third avoidance portion (154) is provided at the bottom of the baffle plate to avoid the direct injection pipe (26).

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