Energy-saving shell-and-tube heat exchanger for ships

Abstract

The present application relates to the technical fields of heat energy engineering, and more specifically discloses an energy-saving shell-and-tube heat exchanger for ships, which is characterized by the following technical scheme: a spiral scraper is arranged on the inner wall of the shell; a shell-side backflow hole is arranged on the bottom of the shell near the end cover; a shell-side water injection hole is arranged on the top of the shell; a tube bundle fixing plate is fixedly connected to the side of the shell; a tube-side filter chamber is fixedly connected to the middle of the end cover; an impurity backflow pipe is arranged on the bottom of the tube-side filter chamber; a fixing bracket is fixedly connected to the inside of the tube-side filter chamber; a filter motor bracket is fixedly connected to the side of the fixing bracket; a filter motor is fixedly connected to the side of the filter motor bracket; an arc-shaped scraper is fixedly connected to the side of the filter motor; a tube bundle water inlet is fixedly connected to the side of the end cover; a metal filter screen is fixedly connected to the inside of the end cover; a head is arranged on the side of the shell; and a shell-side water inlet is arranged on the top of the shell-side water injection hole.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermal energy engineering, and more particularly to an energy-saving shell-and-tube heat exchanger for a ship. BACKGROUND

[0002] A shell-and-tube heat exchanger is a device for heat exchange between two fluids through a tube bundle, and is widely used in chemical industry, energy industry, refrigeration industry, food industry, etc.

[0003] A shell-and-tube heat exchanger is composed of a tube bundle, a shell, a tube sheet, a baffle, a head (end cover), etc., is convenient to manufacture and maintain, and two fluids enter the device from a tube side inlet and a shell side inlet, respectively, exchange heat through a tube bundle wall, high-temperature fluid conducts heat to low-temperature fluid through the tube wall, and finally is discharged from a tube side outlet and a shell side outlet, respectively.

[0004] Although the shell-and-tube heat exchanger is widely used, it still has some disadvantages in actual use.

[0005] 1. The baffle is a key component for optimizing shell side heat transfer of the shell-and-tube heat exchanger, and has obvious disadvantages in actual operation. There is an unavoidable assembly gap between the traditional bow-shaped baffle and the shell and the tube bundle, and these areas are prone to form fluid flow dead zones, which causes medium retention and cannot effectively participate in heat exchange, resulting in a decrease in local heat transfer efficiency. At the same time, the shell side fluid frequently changes flow direction under the repeated blocking of the baffle, forming a mixed flow state of vortex and turbulent flow, which not only strengthens heat transfer to some extent, but also significantly increases fluid resistance.

[0006] 2. The fixed tube sheet heat exchanger is widely used in the industrial field due to its compact structure and low manufacturing cost, but has inherent disadvantages in equipment maintenance. Since the tube bundle is completely fixed with the tube sheet and the shell, the shell side space is closed and narrow, and it is difficult to directly clean by mechanical tools, and can only rely on chemical agent circulation cleaning. However, this cleaning method not only causes corrosion of the metal tube bundle and shortens the service life of the equipment, but also pollutes the environment due to the residual acid and alkali chemicals in the cleaning waste liquid. Especially when dealing with media containing particulate impurities or prone to scaling, frequent chemical cleaning not only increases the maintenance cost, but also seriously restricts the long-term stable operation of the equipment.

[0007] 3. Under the same heat transfer area requirement, shell-and-tube heat exchangers are typically larger in volume and consume more metal due to their structural design. Their large size and weight require more space during installation and place higher demands on transportation and hoisting equipment, significantly increasing installation and transportation costs. In special application scenarios with extremely limited space, such as offshore platforms and ocean-going vessels, the bulky size of shell-and-tube heat exchangers creates a sharp contradiction with the stringent space constraints, making it difficult to meet the requirements for miniaturization and lightweighting in these scenarios, thus limiting their application expansion in high-end equipment fields. Summary of the Invention

[0008] In order to overcome the above-mentioned defects of the prior art, the present invention provides an energy-saving shell-and-tube heat exchanger for ships to solve the problems existing in the background art.

[0009] This invention provides the following technical solution: an energy-saving shell-and-tube heat exchanger for ships, wherein the inner wall of the shell is provided with a spiral scraper, the inner wall of the shell is provided with a rotating track, the bottom of the shell near the end cover is provided with a shell-side reflux hole, the top of the shell is provided with a shell-side water injection hole, a tube bundle fixing plate is fixedly connected to the side of the shell, an end cover is fixedly connected to the side of the tube bundle fixing plate, a tube-side filter chamber is fixedly connected to the middle of the end cover, an impurity reflux pipe is provided at the bottom of the tube-side filter chamber, a fixing bracket is fixedly connected to the inside of the tube-side filter chamber, a filter motor bracket is fixedly connected to the side of the fixing bracket, a filter motor is fixedly connected to the side of the filter motor bracket, an arc-shaped scraper is fixedly connected to the side of the filter motor, a tube bundle water inlet is fixedly connected to the side of the end cover, a metal filter screen is fixedly connected to the inside of the end cover, a cap is provided on the side of the shell, and a shell-side water inlet is provided at the top of the shell-side water injection hole;

[0010] Furthermore, a spiral baffle is fixedly connected to the middle of the tube bundle fixing plate, an upper tube bundle is fixedly connected to the upper region of the tube bundle fixing plate, a central tube bundle is fixedly connected to the central part of the tube bundle fixing plate, a lower tube bundle is fixedly connected to the lower part of the tube bundle fixing plate, and spiral guide plates are fixedly connected inside the upper and lower tube bundles. The two tube bundle fixing plates are fixedly connected to both sides of the shell.

[0011] Furthermore, the inner wall of the housing is provided with a spiral scraper, the middle of the spiral scraper is provided with a spiral scraper blade, the two ends of the four spiral scraper blades are fixedly connected with scraper blade brackets, the spiral scraper blades are in close contact with the inner wall of the housing, the scraper blade brackets are set inside the rotating track, and the scraper blade brackets are provided with liquid guiding holes on the side, there are two liquid guiding holes.

[0012] Further, the side of the tube bundle fixing plate is fixedly connected with a head, the inside of the head is fixedly connected with a layered partition plate, and the bottom of the head is provided with a tube-passing backflow hole.

[0013] Further, the upper part of the shell-passing water injection hole is provided with a backflushing three-way valve, the side of the backflushing three-way valve is provided with a lower three-way valve, and the top of the lower three-way valve is provided with an upper three-way valve.

[0014] Further, the side of the backflushing three-way valve is fixedly connected with a backflushing motor, the side of the upper three-way valve is fixedly connected with an upper three-way valve motor, the side of the upper three-way valve is fixedly connected with an upper blowdown opening, the side of the upper three-way valve is fixedly connected with an upper water inlet, the side of the lower three-way valve is fixedly connected with a lower three-way valve motor, the side of the lower three-way valve is fixedly connected with a lower blowdown opening, the side of the upper three-way valve is fixedly connected with a lower water inlet, the inside of the upper three-way valve is fixedly provided with an upper metal filter screen, and the inside of the lower three-way valve is fixedly provided with a lower metal filter screen.

[0015] Further, the upper layer tube bundle, the central tube bundle and the lower layer tube bundle are fixedly connected inside the spiral baffle.

[0016] Further, the bottom of the shell body is fixedly connected with a base, and two bases are fixedly connected on the two sides of the shell body.

[0017] Technical effects and advantages of the present application:

[0018] 1. The present application changes the traditional arc baffle inside the shell into a spiral baffle, effectively eliminates the fluid flow dead zone at the gap between the tube bundle and the shell, improves the local heat transfer efficiency, and significantly reduces the fluid impact pressure and equipment vibration, prolongs the service life, and at the same time, divides the tube bundle into three independent heat exchange areas by using the partition plate, so that the fluid forms three times of efficient cross flow heat exchange in the shell pass. This layered design fully utilizes the limited space to maximize the heat exchange in unit volume, improves the overall heat exchange efficiency compared with the traditional structure, and is especially suitable for space-limited scenes such as ships.

[0019] 2. The present application is provided with a self-cleaning filtering mechanism at the front end of the middle tube bundle, which adopts a dynamic filtering design. The built-in motor drives the scraper device to work continuously in the running state of the equipment. When impurities adhere to the surface of the filter screen, the high-speed rotating scraper removes them through mechanical friction, and discharges them through the blowdown opening with the help of fluid power. Not only does it realize the self-cleaning of the filtering system without stopping, but also effectively avoids the blockage of the tube bundle by impurities, so that the equipment can maintain stable and efficient operation in the long-term operation of the ship, and the maintenance cycle is fully extended.

[0020] 3. The present application constructs a double self-cleaning reinforced system of the shell and the tube bundle by setting a spiral cleaning scraper on the inner wall of the shell and a spiral guide plate inside the tube bundle. In the shell, the spiral cleaning scraper and the spiral baffle form a linkage structure. When the fluid flows along the spiral baffle, the impact force generated drives the scraper to rotate, continuously cleaning the dirt on the inner wall of the shell. By setting the spiral guide plate inside the upper and lower tube bundles, not only the convection heat transfer in the tube is strengthened, but also the impurities adhering to the tube wall is effectively reduced through the centrifugal force effect. The design makes the equipment have high efficient heat exchange and self-cleaning function, greatly reduces the frequency of shutdown maintenance, significantly improves the continuous operation efficiency, and is especially suitable for complex working conditions under the marine environment. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0022] Figure 2 It is a schematic diagram of the one-half cross-sectional structure of the present application at A.

[0023] Figure 3 It is a schematic diagram of the one-fourth cross-sectional structure of the present application at A.

[0024] Figure 4 It is a schematic diagram of the internal structure of the present application.

[0025] Figure 5 It is a schematic diagram of the internal spiral scraper structure of the present application.

[0026] Figure 6 It is a schematic diagram of the detail structure of the present application at B. Figure 2

[0027] Figure 7 It is a schematic diagram of the detail structure of the present application at C. Figure 3

[0028] Figure 8 It is a schematic diagram of the detail structure of the present application at D. Figure 3

[0029] ​​​The reference signs are: 1, shell; 11, spiral scraping brush; 111, spiral scraping piece; 112, scraping piece support; 12, rotating track; 121, liquid guide hole; 13, shell side backflow hole; 14, shell side water injection hole; 15, tube bundle fixing plate; 151, spiral baffle; 152, upper tube bundle; 153, central tube bundle; 154, lower tube bundle; 155, spiral guide plate; 16, base; 2, end cover; 21, tube side filtration chamber; 22, impurity backflow pipe; 23, fixing support; 24, filtration motor support; 25, filtration motor; 26, arc-shaped scraping plate; 27, tube bundle water inlet; 28, metal filter screen; 3, head; 31, tube side backflow hole; 32, layered partition plate; 4, shell side water inlet; 41, backflushing three-way valve; 411, backflushing motor; 42, upper three-way valve; 421, upper three-way valve motor; 422, upper blowdown outlet; 423, upper water inlet; 424, upper metal filter screen; 43, lower three-way valve; 431, lower three-way valve motor; 432, lower blowdown outlet; 433, lower water inlet; 434, lower metal filter screen. DETAILED DESCRIPTION

[0030] The technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application, and additionally, the forms of each structure described in the following embodiments are only examples, and the energy-saving column tube heat exchanger for a ship to which the present application relates is not limited to each structure described in the following embodiments, and all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0031] Referring to Figure 1 and Figure 2 The present application provides an energy-saving column tube heat exchanger for a ship, the inner wall of the shell 1 is provided with a spiral scraping brush 11, the inner wall of the shell 1 is provided with a rotating track 12, the bottom of the shell 1 is provided with a shell side backflow hole 13 near one side of the end cover 2, the top of the shell 1 is provided with a shell side water injection hole 14, the side of the shell 1 is fixedly connected with a tube bundle fixing plate 15, the side of the tube bundle fixing plate 15 is fixedly connected with the end cover 2, the middle of the end cover 2 is fixedly connected with a tube side filtration chamber 21, the bottom of the tube side filtration chamber 21 is provided with an impurity backflow pipe 22, the inside of the tube side filtration chamber 21 is fixedly connected with a fixing support 23, the side of the fixing support 23 is fixedly connected with a filtration motor support 24, the side of the filtration motor support 24 is fixedly connected with a filtration motor 25, the side of the filtration motor 25 is fixedly connected with an arc-shaped scraping plate 26, the side of the end cover 2 is fixedly connected with a tube bundle water inlet 27, the inside of the end cover 2 is fixedly connected with a metal filter screen 28, the side of the shell 1 is provided with a head 3, and the top of the shell side water injection hole 14 is provided with a shell side water inlet 4.

[0032] Referring to Figure 7The middle part of the tube bundle fixing plate 15 is fixedly connected with a spiral baffle 151, the upper part of the tube bundle fixing plate 15 is fixedly connected with an upper tube bundle 152, the center part of the tube bundle fixing plate 15 is fixedly connected with a center tube bundle 153, the lower part of the tube bundle fixing plate 15 is fixedly connected with a lower tube bundle 154, the inside of the upper tube bundle 152 and the lower tube bundle 154 is fixedly connected with a spiral guide plate 155, and the two tube bundle fixing plates 15 are fixedly connected on the two sides of the shell 1.

[0033] By reasonably arranging the tube bundles inside the tube bundle fixing plate 15, the tube bundles can be divided into three areas, so that three heat exchanges between the fluid inside the tube bundles and the fluid inside the shell are realized. Specifically, the fluid enters the center tube bundle 153 from the tube-side filtering chamber 21 to perform the first heat exchange process. Since it is the first stage of heat exchange, the fluid has a large initial speed, and thus has a large scouring effect on the inner wall of the tube bundle. Impurities will not accumulate on the inner wall, and the fluid will pass through the tube bundle to the maximum extent. Thus, the inner wall of the center tube bundle 153 is smooth. In the next stage, the fluid enters the upper tube bundle 152, and the spiral guide plate 155 arranged on the inner wall guides the flow of the fluid, so that the fluid rotates and further intensifies the scouring effect on the inner wall, so that the internal impurities are separated from the tube wall under the scouring action of the fluid. In the next stage, the fluid enters the lower tube bundle 154, which is the same as the second stage, and thus completes the three heat exchanges of the fluid, improves the heat exchange efficiency, improves the work efficiency, and prolongs the maintenance period to meet the needs of the ship.

[0034] By optimizing the layout of the tube bundles inside the tube bundle fixing plate 15 and dividing them into three independent fluid areas, three-stage heat exchange between the shell-side and tube-side fluids is realized. The specific process is as follows: the fluid first enters the center tube bundle 153 from the tube-side filtering chamber 21 for initial heat exchange. This area serves as the first heat exchange stage, taking advantage of the fluid's initial kinetic energy to create a high-speed scouring effect that effectively prevents impurities from depositing on the tube wall. Meanwhile, the center tube bundle 153 features a smooth inner wall design that reduces flow resistance and ensures smooth fluid passage.

[0035] Subsequently, the fluid enters the upper tube bundle 152 for secondary heat exchange. The upper tube bundle 152 is equipped with spiral guide plates 155 that force the fluid to rotate, creating a spiral flow pattern. This unique flow pattern not only enhances the contact between the fluid and the tube wall, improving heat conduction efficiency, but also strengthens the scouring effect on the tube wall through centrifugal force, making it difficult for impurities to adhere.

[0036] Finally, the fluid enters the lower tube bundle 154 to complete the third heat exchange. The lower tube bundle 154 also features a spiral guide plate design, continuing the rotational flow pattern and further enhancing heat exchange efficiency while ensuring that the tube wall remains clean.

[0037] The three-stage heat exchange structure realizes self-cleaning function of the inner wall of the tube bundle by fluid flushing effect while improving heat exchange efficiency through fluid path optimization and flow state control. Experimental data show that the design can prolong the maintenance period of the ship heat exchanger, significantly reduce the equipment maintenance cost, and meet the needs of long-term continuous operation of the ship.

[0038] With reference to Figure 5 and Figure 6 , the inner wall of the shell 1 is provided with a spiral scraper 11, the middle part of the spiral scraper 11 is provided with a spiral scraper 111, the two ends of the four spiral scrapers 111 are fixedly connected with scraper supports 112, the spiral scraper 111 is tightly attached to the inner wall of the shell 1, the scraper supports 112 are arranged inside the rotating track 12, the side surface of the scraper support 112 is provided with liquid guide holes 121, and there are two liquid guide holes 121.

[0039] With reference to Figure 3 , the side surface of the tube bundle fixing plate 15 is fixedly connected with the head 3, the inside of the head 3 is fixedly connected with the layered partition plate 32, and the bottom of the head 3 is provided with a tube pass backflow hole 31.

[0040] With reference to Figure 8 , the upper part of the shell pass water injection hole 14 is provided with a backflushing three-way valve 41, the side surface of the backflushing three-way valve 41 is provided with a lower three-way valve 43, and the top of the lower three-way valve 43 is provided with an upper three-way valve 42.

[0041] With reference to Figure 8 , the side surface of the backflushing three-way valve 41 is fixedly connected with a backflushing motor 411, the side surface of the upper three-way valve 42 is fixedly connected with an upper three-way valve motor 421, the side surface of the upper three-way valve 42 is fixedly connected with an upper blowdown 422, the side surface of the upper three-way valve 42 is fixedly connected with an upper water inlet 423, the side surface of the lower three-way valve 43 is fixedly connected with a lower three-way valve motor 431, the side surface of the lower three-way valve 43 is fixedly connected with a lower blowdown 432, the side surface of the upper three-way valve 42 is fixedly connected with a lower water inlet 433, the inside of the upper three-way valve 42 is fixedly connected with an upper metal filter screen 424, and the inside of the lower three-way valve 43 is fixedly connected with a lower metal filter screen 434.

[0042] The three electrically operated three-way valves can automatically clean the impurities on the surfaces of the upper metal filter screen 424 and the lower metal filter screen 434. The specific working process is as follows: the back flushing three-way valve 41 is arranged on the upper part of the shell side water injection hole 14, and a circulating loop system is constructed. When the upper metal filter screen 424 needs to be cleaned, the upper three-way valve motor 421 drives the upper three-way valve 42 to switch the state, closes the upper water inlet 423, and connects the back flushing three-way valve 41 and the upper blowdown outlet 422. At this time, the cooling liquid input through the lower water inlet 433 will be back flushed to the upper metal filter screen 424, and the impurities will be discharged through the upper blowdown outlet 422. If the lower metal filter screen 434 needs to be cleaned, the upper blowdown outlet 422 is kept in a closed state, and the back flushing three-way valve 41 connects the upper water inlet 423 and the lower blowdown outlet 432. The cooling liquid input through the upper water inlet 423 will back flush the lower metal filter screen 434, and the impurities will be discharged through the lower blowdown outlet 432. The whole cleaning process only needs to adjust the control program, and does not need to stop the machine and disassemble the equipment, realizes the online automatic back flushing function, greatly improves the operation efficiency and reliability of the heat exchanger, and reduces the artificial maintenance cost.

[0043] With reference to Figure 4 The upper tube bundle 152, the central tube bundle 153 and the lower tube bundle 154 are fixedly connected inside the spiral baffle 151.

[0044] With reference to Figure 2 The bottom of the shell 1 is fixedly connected with a base 16, and two bases 16 are fixedly connected on the two sides of the shell 1, for fixing the device at a required position.

[0045] The working principle of the present application is as follows: in the initial stage, the upper water inlet 423, the lower water inlet 433 and the shell side water injection hole 14 are connected through the cooperation of the upper three-way valve 42 and the lower three-way valve 43, the upper blowdown outlet 422 and the lower blowdown outlet 432 arranged on the sides of the upper three-way valve 42 and the lower three-way valve 43 are connected to a sewage discharge pipe, and liquid can enter the internal cavity through the shell side water injection hole 14 in the tube side or shell side stage to perform heat exchange work.

[0046] In the cooling liquid working stage, when the cooling liquid is inside the shell 1, the liquid to be cooled enters the chamber through the shell-side water injection hole 14, and moves inside the shell towards the shell-side return flow hole 13. The flow of the cooling liquid inside the shell 1 is helical due to the flow guiding effect of the helical baffle 151 fixedly connected in the middle of the tube bundle fixing plate 15, and exchanges heat with the tube bundle arranged on the tube bundle fixing plate 15. The cooling liquid impacts the inner surface of the shell 1 under the flow guiding effect of the helical baffle 151. Through the impact of the cooling liquid, the helical scraper 11 arranged on the inner wall surface of the shell 1 is pushed, and the rotating action of the helical scraper 11 is realized. When the cooling liquid enters the inside of the shell 1, it fills the inside of the rotating track 12 through the liquid guiding hole 121 in the lower inner wall surface of the shell 1 under the action of pressure and gravity, reduces the friction between the blade bracket 112 arranged at both ends of the helical scraper 11 and the shell 1, improves the smoothness of the helical scraper 11 during rotation, ensures the cleaning effect of the helical scraper 111 on the inner wall surface of the shell 1, and realizes the non-stop cleaning of the equipment by scraping the impurities attached to the inner surface of the shell 1 with the helical scraper 111 and discharging them through the shell-side return flow hole 13 under the action of the helical scraper 111. The maintenance cycle of the equipment is improved.

[0047] In the self-cleaning stage of the cooling liquid, when the impurities accumulate on the surface of one of the upper metal filter screen 424 and the lower metal filter screen 434, taking the upper metal filter screen 424 as an example, the upper water inlet 423 and the lower water inlet 433 are connected to each other by the backflush motor 411 arranged on the side of the backflush three-way valve 41, and the upper three-way valve motor 421 arranged on the side of the upper three-way valve 42 is driven to realize the closing of the upper water inlet 423 and the opening of the upper blowdown port 422. At this time, the cooling liquid in the lower water inlet 433 is discharged from the upper blowdown port 422 through the backflush three-way valve 41, and the upper metal filter screen 424 inside the upper three-way valve 42 is backflushed, thereby achieving the purpose of cleaning the upper metal filter screen 424. For ocean-going ships, this method avoids complicated filter screen cleaning operations, shortens the maintenance time of the equipment, and improves work efficiency.

[0048] The cooled liquid working stage, the cooled liquid passes through the pipe bundle, the cooled liquid enters the pipe bundle into the water inlet 27 into the pipe filter chamber 21 arranged in the middle of the end cover 2, the cooled liquid can be filtered by the metal screen 28 arranged in the pipe filter chamber 21, then the first heat exchange work is carried out through the plurality of central pipe bundles 153 arranged in the middle of the pipe bundle fixing plate 15, then enters the head 3, the head 3 is divided into two cavities by the layered partition plate 32 arranged in the head 3, the cooled liquid can enter the upper pipe bundle 152 under the partition of the layered partition plate 32, the second heat exchange work is carried out in the process of passing through the upper pipe bundle 152, then enters the end cover 2, and the third heat exchange work is carried out through the lower pipe bundle 154, when the cooled liquid passes through the upper pipe bundle 152 and the lower pipe bundle 154, the rotation of the cooled liquid can be realized through the flow guide effect of the spiral flow guide plate 155 arranged in the pipe bundle, and then the scouring effect of the liquid on the inner wall of the pipe bundle is realized, further reducing the dirt accumulation on the inner wall of the pipe bundle, realizing the self-cleaning of the pipe bundle, prolonging the maintenance period of the equipment, and improving the reliability of long-term operation of the equipment, finally the cooled liquid after 3 cooling processes is discharged from the pipe return hole 31, and the work is completed.

[0049] The filter screen self-cleaning stage, the cooled liquid entering the end cover 2 through the pipe bundle inlet 27 is filtered by the metal filter screen 28, so that the impurities are accumulated on the surface of the metal filter screen 28, the filter motor support 24 and the filter motor 25 are fixed at the center position through the fixed support 23 arranged in the end cover 2, and there is a certain distance from the metal filter screen 28, the impurities on the surface of the metal filter screen 28 can be moved to the periphery through the scraping effect of the arc-shaped scraper 26 arranged in front of the filter motor 25, and under the combined action of pressure and the arc-shaped scraper 26, the impurities are discharged from the impurity return pipe 22 by a small amount of liquid, the cleaning of the filter screen is realized automatically, and the problem of work efficiency reduction caused by shutdown maintenance is avoided.

[0050] Secondly, the drawings of the disclosed embodiments only relate to the structures involved in the disclosed embodiments, other structures can refer to the usual design, and under the condition of no conflict, the same embodiment and different embodiments of the present application can be combined with each other;

[0051] Finally, the above only describes the preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An energy saving shell and tube heat exchanger for marine vessels comprising a shell (1) characterised in that: The inner wall of the shell (1) is provided with a spiral scraper (11), the inner wall of the shell (1) is provided with a rotating track (12), the inner wall of the shell (1) is provided with a spiral scraper (11), the middle part of the spiral scraper (11) is provided with a spiral scraper (111), the two ends of the four spiral scrapers (111) are fixedly connected with scraper supports (112), the spiral scraper (111) is tightly attached to the inner wall of the shell (1), the scraper support (112) is arranged in the rotating track (12), the side surface of the scraper support (112) is provided with liquid guide holes (121), the shell (1) is provided with a shell backflow hole (13) near the side of the end cover (2), the top of the shell (1) is provided with a shell water injection hole (14), the side surface of the shell (1) is fixedly connected with a tube bundle fixing plate (15), the side surface of the tube bundle fixing plate (15) is fixedly connected with an end cover (2), the middle part of the end cover (2) is fixedly connected with a tube filter chamber (21), the bottom of the tube filter chamber (21) is provided with an impurity backflow pipe (22), the inside of the tube filter chamber (21) is fixedly connected with a fixed support (23), the side surface of the fixed support (23) is fixedly connected with a filter motor support (24), the side surface of the filter motor support (24) is fixedly connected with a filter motor (25), the side surface of the filter motor (25) is fixedly connected with an arc-shaped scraper (26), the side surface of the end cover (2) is fixedly connected with a tube bundle water inlet (27), the inside of the end cover (2) is fixedly connected with a metal filter screen (28), the side surface of the shell (1) is provided with an end cover (3), and the top of the shell water injection hole (14) is provided with a shell water inlet (4).

2. An energy saving tubular heat exchanger for marine vessels according to claim 1, characterized in that: The middle part of the tube bundle fixing plate (15) is fixedly connected with a spiral baffle (151), the upper region of the tube bundle fixing plate (15) is fixedly connected with an upper tube bundle (152), the central part of the tube bundle fixing plate (15) is fixedly connected with a central tube bundle (153), the lower part of the tube bundle fixing plate (15) is fixedly connected with a lower tube bundle (154), the inside of the upper tube bundle (152) and the lower tube bundle (154) is fixedly connected with a spiral guide plate (155), and the two tube bundle fixing plates (15) are fixedly connected on the two sides of the shell (1).

3. The energy saving tubular heat exchanger for marine vessels as claimed in claim 1 wherein: The side surface of the tube bundle fixing plate (15) is fixedly connected with an end cover (3), the inside of the end cover (3) is fixedly connected with a layered partition plate (32), and the bottom of the end cover (3) is provided with a tube backflow hole (31).

4. The energy saving tubular heat exchanger for marine vessels as claimed in claim 1 wherein: The upper part of the shell water injection hole (14) is provided with a backflushing three-way valve (41), the side surface of the backflushing three-way valve (41) is provided with a lower three-way valve (43), and the top of the lower three-way valve (43) is provided with an upper three-way valve (42).

5. An energy saving shell and tube heat exchanger for marine use according to claim 4, characterized in that: The side of the back flush three-way valve (41) is fixedly connected with a back flush motor (411), the side of the upper three-way valve (42) is fixedly connected with an upper three-way valve motor (421), the side of the upper three-way valve (42) is fixedly connected with an upper blowdown outlet (422), the side of the upper three-way valve (42) is fixedly connected with an upper water inlet (423), the side of the lower three-way valve (43) is fixedly connected with a lower three-way valve motor (431), the side of the lower three-way valve (43) is fixedly connected with a lower blowdown outlet (432), the side of the upper three-way valve (42) is fixedly connected with a lower water inlet (433), the inside of the upper three-way valve (42) is fixedly connected with an upper metal filter screen (424), and the inside of the lower three-way valve (43) is fixedly connected with a lower metal filter screen (434).

6. An energy saving tubular heat exchanger for marine use according to claim 2, characterized in that: The upper layer pipe bundle (152), the center pipe bundle (153) and the lower layer pipe bundle (154) are fixedly connected inside the spiral baffle (151).

7. The energy saving tubular heat exchanger for marine use according to claim 1, characterized in that: The bottom of the shell (1) is fixedly connected with a base (16), and the two bases (16) are fixedly connected on the two sides of the shell (1).

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