Novel shell-and-tube heat exchanger

Abstract

The utility model provides a novel shell-and-tube heat exchanger, which belongs to the technical field of shell-and-tube heat exchangers and comprises a heat exchange bundle group arranged in the middle of the shell-and-tube heat exchanger, a plurality of upper pipeline fixing discs are arranged at the upper half part of the heat exchange bundle group, and a plurality of lower pipeline fixing discs are arranged at the lower half part of the heat exchange bundle group. A first cleaning assembly is arranged in the upper pipeline fixing disc, a second cleaning assembly is arranged in the lower pipeline fixing disc, a plurality of sets of first cleaning openings are formed in the surface of the upper pipeline fixing disc, and a plurality of sets of second cleaning openings are formed in the surface of the lower pipeline fixing disc. According to the utility model, the upper half part of the heat exchange bundle group is cleaned by the cleaning liquid through the first cleaning opening by the first backwashing assembly, and the lower half part of the heat exchange bundle group is cleaned by the cleaning liquid through the second cleaning opening by the second backwashing assembly, so that the whole heat exchange bundle group is washed, and the use of workers is facilitated; and the outer surface of the heat exchange tube can be conveniently and frequently cleaned, the probability of scale accumulation on the outer wall of the heat exchange tube is reduced, and therefore the service life of equipment is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of shell-and-tube heat exchanger technology, and specifically to a novel shell-and-tube heat exchanger. Background Technology

[0002] With the increasing global energy consumption and growing environmental pressures, efficient energy utilization has become an urgent need for modern industrial and social development. Boilers, as thermal energy equipment, require a large number of heat exchange devices for heat transfer. Shell-and-tube heat exchangers, through efficient heat transfer, can achieve efficient heat recovery and utilization in boiler systems, thereby reducing energy consumption costs and improving energy efficiency.

[0003] In related technologies, shell-and-tube heat exchangers exchange heat from two fluids: one flows inside the tubes (tube-side fluid), and the other flows outside the tubes (shell-side fluid). To improve the heat transfer coefficient of the fluid outside the tubes, several baffles are usually installed inside the shell. These baffles increase the velocity of the shell-side fluid, forcing it to pass through the tube bundle laterally multiple times along a predetermined path, thereby enhancing the turbulence and improving heat exchange efficiency.

[0004] However, in existing shell-and-tube heat exchangers, after prolonged external flow during operation, scale will adhere to the outer wall of the heat exchange tubes in the heat exchange bundle assembly. Cleaning the scale on the outer wall of the heat exchange tubes usually requires disassembling the shell and tube, making it inconvenient to use the heat exchange tubes for frequent cleaning. To solve the above problems, a new type of shell-and-tube heat exchanger is proposed. Utility Model Content

[0005] In view of this, the present invention provides a novel shell-and-tube heat exchanger. The present invention uses a first backwash assembly to supply cleaning fluid into a first cleaning tube via a first backwash pump, and then discharges the cleaning fluid through a first cleaning port to clean the outer wall of the upper half of the heat exchange tubes in the heat exchange bundle assembly. A second backwash assembly uses a second backwash pump to supply cleaning fluid into a second cleaning tube, and then discharges the cleaning fluid through a second cleaning port to clean the outer wall of the lower half of the heat exchange tubes in the heat exchange bundle assembly. This process thoroughly rinses the outer wall of the entire heat exchange bundle assembly, facilitating use by operators and enabling frequent cleaning of the heat exchange tubes, reducing the likelihood of scale buildup on the outer wall and thus extending the equipment's service life.

[0006] To solve the above-mentioned technical problems, this utility model provides a novel shell-and-tube heat exchanger, including a heat exchange bundle assembly disposed in the middle of the shell-and-tube heat exchanger. A front positioning frame is disposed at the front end of the heat exchange bundle assembly, and a rear positioning frame is disposed at the rear end of the heat exchange bundle assembly. Multiple upper pipe fixing plates are disposed in the upper half of the heat exchange bundle assembly, and multiple lower pipe fixing plates are disposed in the lower half of the heat exchange bundle assembly. The upper and lower pipe fixing plates are arranged alternately. A first cavity is disposed in the upper pipe fixing plate, and a second cavity is disposed in the lower pipe fixing plate. A first cleaning pipe is disposed on one side of the bottom of the first cavity. A first cleaning component is disposed on the side of the first cleaning pipe that passes through the tube wall of the shell-and-tube heat exchanger. A second cleaning pipe is disposed on one side of the bottom of the second cavity. A second cleaning component is disposed on the side of the second cleaning pipe that passes through the tube wall of the shell-and-tube heat exchanger. Several sets of first cleaning ports are disposed on the surface of the upper pipe fixing plate, and several sets of second cleaning ports are disposed on the surface of the lower pipe fixing plate.

[0007] The surface of the upper pipe fixing plate is provided with several upper connection ports, which are used for the insertion and positioning of the heat exchange tubes in the upper half of the heat exchange bundle. The surface of the lower pipe fixing plate is provided with several lower connection ports, which are used for the insertion and positioning of the heat exchange tubes in the lower half of the heat exchange bundle.

[0008] Each set of first cleaning ports surrounds the surface of the upper connection port, and each set of second cleaning ports surrounds the surface of the lower connection port. The first cleaning port communicates with the first cavity, and the second cleaning port communicates with the second cavity.

[0009] The first cleaning assembly includes an upper parallel pipe connected to the water inlet of a first cleaning pipe. The upper parallel pipe connects multiple first cleaning pipes together, so that each first cleaning pipe can receive flushing water when water is supplied to the upper parallel pipe. A first flushing pipe is provided in the middle of the upper parallel pipe, which connects the upper parallel pipe to a first backwash pump. A first electric valve is provided on both the left and right sides of the first flushing pipe, which controls the opening and closing of each first cleaning pipe and is connected to the upper parallel pipe. A first backwash pump is provided at the water inlet of the first flushing pipe, which pumps the backwash cleaning fluid of the heat exchange tubes into the first flushing pipe, so that the cleaning fluid enters the first cavity and backwashes the upper half of the heat exchange bundle assembly through the first cleaning port, thereby reducing the growth of scale on the heat exchange tubes.

[0010] The second cleaning assembly includes a lower parallel pipe connected to the water inlet of the second cleaning pipe. The lower parallel pipe connects multiple second cleaning pipes together, so that each second cleaning pipe can receive flushing water when water is supplied to the lower parallel pipe. A second flushing pipe is provided in the middle of the lower parallel pipe, which connects the lower parallel pipe to the second backwash pump. A second electric valve is provided on both the left and right sides of the second flushing pipe, which controls the on / off state of each second cleaning pipe and is connected to the lower parallel pipe. A second backwash pump is provided at the water inlet of the second flushing pipe, which pumps the backwash cleaning fluid of the heat exchange tubes into the second flushing pipe, so that the cleaning fluid enters the second cavity and backwashes the lower half of the heat exchange bundle assembly through the second cleaning port, thereby reducing the growth of scale on the heat exchange tubes.

[0011] The first flushing pipe is equipped with a first check valve to prevent water from flowing through the first flushing pipe, and the second flushing pipe is equipped with a second check valve to prevent water from flowing through the second flushing pipe.

[0012] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0013] 1. The first backwash assembly supplies cleaning fluid into the first cleaning pipe via the first backwash pump, and then discharges the cleaning fluid through the first cleaning port to clean the outer wall of the upper half of the heat exchanger tubes in the heat exchanger bundle assembly. The second backwash assembly supplies cleaning fluid into the second cleaning pipe via the second backwash pump, and then discharges the cleaning fluid through the second cleaning port to clean the outer wall of the lower half of the heat exchanger tubes in the heat exchanger bundle assembly. This process flushes the outer wall of the entire heat exchanger bundle assembly, making it easier for operators to use and for them to frequently clean the surface of the heat exchanger tubes, reducing the chance of scale buildup on the outer wall and thus extending the service life of the equipment.

[0014] 2. The upper connection port is used for the insertion and positioning of the heat exchange tubes in the upper half of the heat exchange bundle assembly, and the lower connection port is used for the insertion and positioning of the heat exchange tubes in the lower half of the heat exchange bundle assembly, so that the fluid reaches a turbulent state, thereby improving the heat transfer coefficient. This design can change the flow direction of the fluid, increase the degree of turbulence of the fluid, and make the fluid form stronger disturbances on the surface of the heat exchange tubes, thereby enhancing the heat exchange effect.

[0015] 3. The first check valve is used to prevent water in the heat exchanger from entering the inlet of the first backwash pump through the first cleaning pipe, thereby avoiding cross-contamination. The second check valve is used to prevent water in the heat exchanger from entering the inlet of the second backwash pump through the second cleaning pipe, thereby avoiding cross-contamination. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0017] Figure 2 This is a front sectional view of the present invention;

[0018] Figure 3 This is a side sectional view of the present invention;

[0019] Figure 4 This is a side sectional view of the present invention.

[0020] Explanation of reference numerals in the attached drawings: 100, Shell-and-tube heat exchanger; 101, Heat exchange bundle assembly; 102, Heat exchange tube; 103, Front positioning frame; 104, Rear positioning frame; 200, Upper pipe fixing plate; 201, First cavity; 202, First cleaning pipe; 203, First cleaning port; 204, Upper connection port; 300, Lower pipe fixing plate; 301, Second cavity; 302, Second cleaning pipe; 303, Second cleaning port; 304, Lower connection port; 305, First check valve; 400, First cleaning assembly; 401, Upper parallel pipe; 402, First flushing pipe; 403, First electric valve; 404, First backwash pump; 500, Second cleaning assembly; 501, Lower parallel pipe; 502, Second flushing pipe; 503, Second electric valve; 504, Second backwash pump; 505, Second check valve. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1-4 The technical solutions of the embodiments of this utility model are clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0022] like Figure 1-4As shown: This embodiment provides a novel shell-and-tube heat exchanger, including a heat exchange bundle assembly 101 disposed in the middle of the shell-and-tube heat exchanger 100. The heat exchange bundle assembly 101 includes multiple arranged heat exchange tubes 102. A front positioning frame 103 is provided at the front end of the heat exchange bundle assembly 101 for fixing the front end of the heat exchange bundle assembly 101. A rear positioning frame 104 is provided at the rear end of the heat exchange bundle assembly 101 for fixing the rear end of the heat exchange bundle assembly 101. The front positioning frame 103 is a disc-shaped positioning frame with through holes adapted to the heat exchange tubes 102. The rear positioning frame 104 is a disc-shaped positioning frame with through holes inside. The heat exchanger assembly 101 is perforated to fit the heat exchange tube 102. The upper half of the heat exchanger assembly 101 has multiple upper pipe fixing plates 200, and the lower half has multiple lower pipe fixing plates 300. The upper and lower pipe fixing plates 200 and 300 are arranged alternately, both being semi-circular in shape. The upper and lower pipe fixing plates 200 and 300 can form a complete disc. A first cavity 201 is provided within each upper pipe fixing plate 200, storing the cleaning fluid flowing through the first cleaning tube 202. A second cavity 301 is provided within each lower pipe fixing plate 300. 1. A first cleaning pipe 202 is provided on one side of the bottom of the first cavity 201. The first cleaning pipe 202 is used to connect the first cavity 201 of the upper pipe fixing plate 200 with the first cleaning assembly 400. The first cleaning pipe 202 is provided on one side of the first cleaning pipe 202 passing through the tube wall of the shell-and-tube heat exchanger 100. The first cleaning assembly 400 is used to supply cleaning fluid to the first cavity 201. A second cleaning pipe 302 is provided on one side of the bottom of the second cavity 301. The second cleaning pipe 302 is used to connect the second cavity 301 of the lower pipe fixing plate 300 with the second cleaning assembly 500. A second cleaning assembly 500 is provided on one side of the tube wall through which the cleaning pipe 302 passes. The second cleaning assembly 500 is used to supply cleaning fluid to the second cavity 301. Several sets of first cleaning ports 203 are provided on the surface of the upper pipe fixing plate 200. Each set of first cleaning ports 203 is preferably designed to have five round holes, which are arranged circumferentially on the surface of the upper connection port 204. Several sets of second cleaning ports 303 are provided on the surface of the lower pipe fixing plate 300. Each set of second cleaning ports 303 is preferably designed to have five round holes, which are arranged circumferentially on the surface of the lower connection port 304. A drain valve is provided at the bottom of the shell of the shell-and-tube heat exchanger 100.

[0023] In operation, the first electric valve 403 is opened, causing the first backwash pump 404 to supply cleaning fluid into the upper parallel pipe 401 through the first flushing pipe 402. The cleaning fluid is then distributed through the upper parallel pipe 401 to each first cleaning pipe 202, allowing it to enter the first cavity 201 within the upper pipe fixing plate 200. Finally, the cleaning fluid is discharged through the first cleaning port 203 to clean the outer wall of the upper half of the heat exchange tubes 102 of the heat exchange bundle assembly 101. Simultaneously, the second electric valve 503 is opened, causing the second backwash pump 504 to supply cleaning fluid into the lower... Within the parallel pipe 501, the cleaning fluid is diverted to each second cleaning pipe 302 through the lower parallel pipe 501, thereby allowing the cleaning fluid to enter the second cavity 301 within the lower pipe fixing plate 300. Finally, the cleaning fluid is discharged through the second cleaning port 303 to clean the outer wall of the lower half of the heat exchange tubes 102 of the heat exchange bundle assembly 101, thus rinsing the outer wall of the heat exchange tubes 102 on the entire heat exchange bundle assembly 101. This facilitates the use by the staff and makes it easier to clean the surface of the heat exchange tubes 102 frequently, reducing the chance of scale accumulation on their outer wall and thus improving the service life of the equipment.

[0024] This embodiment provides a novel shell-and-tube heat exchanger.

[0025] like Figure 1 , 2 As shown in Figures 3 and 4: The surface of the upper pipe fixing plate 200 is provided with several upper connection ports 204. These upper connection ports 204 are used for the insertion and positioning of the heat exchange tubes 102 in the upper half of the heat exchange bundle assembly 101. Each upper connection port 204 within the upper pipe fixing plate 200 is fitted with a protective sleeve to prevent the water flow from the first cleaning pipe 202 from impacting the heat exchange tubes 102. The surface of the lower pipe fixing plate 300 is provided with several lower connection ports 304. These lower connection ports 304 are used for the insertion and positioning of the heat exchange tubes 102 in the lower half of the heat exchange bundle assembly 101. Each group of first cleaning ports 203 surrounds... On the surface of the upper connection port 204, each set of second cleaning ports 303 surrounds the surface of the lower connection port 304. The lower connection ports 304 located in the lower pipe fixing plate 300 are all equipped with protective sleeves to prevent the water flow from the second cleaning pipe 302 from impacting the heat exchange tube 102. The first cleaning port 203 is connected to the first cavity 201, and the second cleaning port 303 is connected to the second cavity 301. The upper pipe fixing plate 200 and the lower pipe fixing plate 300 are both semi-circular arc shapes, and the upper pipe fixing plate 200 and the lower pipe fixing plate 300 can form a complete disc.

[0026] The effect is as follows: the upper connection port 204 is used for the insertion and positioning of the heat exchange tubes 102 in the upper half of the heat exchange bundle 101, and the lower connection port 304 is used for the insertion and positioning of the heat exchange tubes 102 in the lower half of the heat exchange bundle 101, so that the fluid reaches a turbulent state, thereby improving the heat transfer coefficient. This design can change the flow direction of the fluid, increase the degree of turbulence of the fluid, and make the fluid form a stronger disturbance on the surface of the heat exchange tubes 102, thereby enhancing the heat transfer effect.

[0027] like Figure 1 , 3 As shown in Figure 4, the first cleaning assembly 400 includes an upper parallel pipe 401 disposed between the first cleaning pipe 202 and the water inlet end. The first cleaning pipe 202 and the upper parallel pipe 401 can be connected by flange sealing or welding. The upper parallel pipe 401 is used to connect multiple first cleaning pipes 202 in parallel, so that each first cleaning pipe 202 can receive flushing water when water is supplied to the upper parallel pipe 401. A first flushing pipe 402 is disposed in the middle of the upper parallel pipe 401. The first flushing pipe 402 is welded to the upper parallel pipe 401. The first flushing pipe 402 is used to connect the upper parallel pipe 401 to the first backwash pump 404. A first flushing pump 404 is disposed on both the left and right sides of the first flushing pipe 402. An electric valve 403 is fixedly connected to the upper parallel pipe 401 via a flange. The first electric valve 403 is used to control the opening and closing of each first cleaning pipe 202. The first electric valve 403 is connected to the upper parallel pipe 401. A first backwash pump 404 is provided at the water inlet end of the first flushing pipe 402. The first backwash pump 404 is sealed to the first flushing pipe 402 via a flange. The first backwash pump 404 is used to pump the backwash cleaning fluid of the heat exchange tube 102 into the first flushing pipe 402, so that the cleaning fluid enters the first cavity 201, and backwashes the upper half of the heat exchange bundle assembly 101 through the first cleaning port 203, thereby reducing the growth of scale on the heat exchange tube 102.

[0028] Its effects are as follows: the first electric valve 403 is used to remotely control the opening and closing of each first cleaning pipe 202, and the first backwash pump 404 is used to pump the backwash cleaning fluid of the heat exchange tube 102 into the first flushing pipe 402, so that the cleaning fluid enters the first cavity 201, and backwashes the upper half of the heat exchange bundle 101 through the first cleaning port 203, thereby reducing the growth of scale on the outer surface of the heat exchange tube 102 in the upper half of the heat exchange bundle 101.

[0029] like Figure 1 , 3As shown in Figure 4: The second cleaning assembly 500 includes a lower parallel pipe 501 disposed between the second cleaning pipe 302 and the water inlet end. The second cleaning pipe 302 and the lower parallel pipe 501 can be connected by flange sealing or welding. The lower parallel pipe 501 is used to connect multiple second cleaning pipes 302 in parallel, so that each second cleaning pipe 302 can receive flushing water when water is supplied to the lower parallel pipe 501. A second flushing pipe 502 is disposed in the middle of the lower parallel pipe 501. The second flushing pipe 502 is welded to the lower parallel pipe 501. The second flushing pipe 502 is used to connect the lower parallel pipe 501 to the second backwash pump 504. A second flushing pump is disposed on both the left and right sides of the second flushing pipe 502. Two electric valves 503 are connected and fixed to the lower parallel pipe 501 via flanges. The second electric valve 503 is used to control the opening and closing of each second cleaning pipe 302. The second electric valve 503 is connected to the lower parallel pipe 501. A second backwash pump 504 is provided at the water inlet end of the second flushing pipe 502. The second backwash pump 504 is connected to the second flushing pipe 502 via flange sealing. The second backwash pump 504 is used to pump the backwash cleaning fluid of the heat exchange tube 102 into the second flushing pipe 502, so that the cleaning fluid enters the second cavity 301, and backwashes the lower half of the heat exchange bundle assembly 101 through the second cleaning port 303, thereby reducing the growth of scale on the heat exchange tube 102.

[0030] Its effects are as follows: the second electric valve 503 is used to remotely control the opening and closing of each second cleaning pipe 302, and the second backwash pump 504 is used to pump the backwash cleaning fluid of the heat exchange tube 102 into the second flushing pipe 502, so that the cleaning fluid enters the second cavity 301, and backwashes the lower half of the heat exchange bundle 101 through the second cleaning port 303, thereby reducing the growth of scale on the outer surface of the heat exchange tube 102 in the lower half of the heat exchange bundle 101.

[0031] like Figure 1 , 3 As shown in Figure 4: A first check valve 305 is provided on the first flushing pipe 402 to prevent water from flowing through the first flushing pipe 402. The first check valve 305 is sealed to the first flushing pipe 402 through a flange. A second check valve 505 is provided on the second flushing pipe 502 to prevent water from flowing through the second flushing pipe 502. The second check valve 505 is sealed to the second flushing pipe 502 through a flange.

[0032] Its effects are as follows: the first check valve 305 is used to prevent water in the heat exchanger from entering the inlet of the first backwash pump 404 through the first cleaning pipe 202, thereby avoiding water leakage; the second check valve 505 is used to prevent water in the heat exchanger from entering the inlet of the second backwash pump 504 through the second cleaning pipe 302, thereby avoiding water leakage.

[0033] Working principle: Opening the first electric valve 403 causes the first backwash pump 404 to supply cleaning fluid through the first flushing pipe 402 into the upper parallel pipe 401. The cleaning fluid is then distributed through the upper parallel pipe 401 to each first cleaning pipe 202, allowing it to enter the first cavity 201 within the upper pipe fixing plate 200. Finally, the cleaning fluid is discharged through the first cleaning port 203 to clean the outer wall of the upper half of the heat exchange tubes 102 of the heat exchange bundle assembly 101. Simultaneously, opening the second electric valve 503 causes the second backwash pump 504 to supply cleaning fluid through the second flushing pipe 502 into the lower parallel pipe 501. The cleaning fluid is then distributed through the lower parallel pipe 501. The cleaning fluid is directed into each second cleaning pipe 302, thereby entering the second cavity 301 within the lower pipe fixing plate 300. Finally, the cleaning fluid is discharged through the second cleaning port 303 to clean the outer wall of the lower half of the heat exchange tubes 102 of the heat exchange bundle assembly 101, thus rinsing the outer wall of the heat exchange tubes 102 on the entire heat exchange bundle assembly 101. This facilitates the use by the staff and makes it easier to clean the surface of the heat exchange tubes 102 frequently, reducing the chance of scale accumulation on their outer wall and thus improving the service life of the equipment. During use, the first backwash pump 404 or the second backwash pump 504 can be controlled separately to rinse the upper and lower parts of the heat exchange bundle assembly 101 separately.

[0034] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A novel shell-and-tube heat exchanger, comprising a heat exchange bundle group (101) arranged in the middle of a shell-and-tube heat exchanger (100), a front positioning frame (103) arranged at the front end of the heat exchange bundle group (101), and a rear positioning frame (104) arranged at the rear end of the heat exchange bundle group (101), characterized in that: The upper half of the heat exchange beam group (101) is provided with a plurality of upper pipeline fixing discs (200), the lower half of the heat exchange beam group (101) is provided with a plurality of lower pipeline fixing discs (300), the upper pipeline fixing discs (200) and the lower pipeline fixing discs (300) are staggered, the first cavity (201) is arranged in the upper pipeline fixing disc (200), the second cavity (301) is arranged in the lower pipeline fixing disc (300), one side of the bottom of the first cavity (201) is provided with a first cleaning pipe (202), the first cleaning pipe (202) passes through one side of the tube wall of the shell-and-tube heat exchanger (100) and is provided with a first cleaning assembly (400), one side of the bottom of the second cavity (301) is provided with a second cleaning pipe (302), the second cleaning pipe (302) passes through one side of the tube wall of the shell-and-tube heat exchanger (100) and is provided with a second cleaning assembly (500), the surface of the upper pipeline fixing disc (200) is provided with a plurality of groups of first cleaning ports (203), and the surface of the lower pipeline fixing disc (300) is provided with a plurality of groups of second cleaning ports (303).

2. A shell and tube heat exchanger as claimed in claim 1, wherein: The surface of the upper pipeline fixing disc (200) is provided with a plurality of upper connecting ports (204), the upper connecting ports (204) are used for positioning the heat exchange pipes (102) in the upper half of the heat exchange beam group (101), and the surface of the lower pipeline fixing disc (300) is provided with a plurality of lower connecting ports (304), the lower connecting ports (304) are used for positioning the heat exchange pipes (102) in the lower half of the heat exchange beam group (101).

3. A shell and tube heat exchanger as claimed in claim 2, wherein: Each group of the first cleaning ports (203) surrounds the surface of the upper connecting port (204), each group of the second cleaning ports (303) surrounds the surface of the lower connecting port (304), the first cleaning port (203) communicates with the first cavity (201), and the second cleaning port (303) communicates with the second cavity (301).

4. A shell and tube heat exchanger as claimed in claim 3, wherein: The first cleaning assembly (400) comprises an upper parallel pipeline (401) arranged between the water inlet end of the first cleaning pipe (202), a first flushing pipeline (402) is arranged in the middle of the upper parallel pipeline (401), a first electric valve (403) is arranged on the left and right sides of the first flushing pipeline (402), the first electric valve (403) communicates with the upper parallel pipeline (401), and a first backwashing pump (404) is arranged at the water inlet end of the first flushing pipeline (402).

5. A shell and tube heat exchanger of novel design as claimed in claim 4 wherein: The second cleaning assembly (500) comprises a lower parallel pipeline (501) arranged between the water inlet end of the second cleaning pipe (302), a second flushing pipeline (502) is arranged in the middle of the lower parallel pipeline (501), a second electric valve (503) is arranged on the left and right sides of the second flushing pipeline (502), the second electric valve (503) communicates with the lower parallel pipeline (501), and a second backwashing pump (504) is arranged at the water inlet end of the second flushing pipeline (502).

6. A shell and tube heat exchanger of novel design as claimed in claim 5 wherein: The first flush pipe (402) is provided with a first check valve (305), and the second flush pipe (502) is provided with a second check valve (505).

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