Tubular heat exchanger

Abstract

The utility model provides a tubular heat exchanger. The tubular heat exchanger comprises a horizontally-arranged shell and two sleeves coaxial with the shell. The side, away from the shell, of each sleeve is connected with a tube plate, and each tube plate is connected with the corresponding end socket. A first fluid inlet and a first fluid outlet are formed in the two end sockets respectively, and a second fluid inlet and a second fluid outlet are formed in the two sleeves respectively. The two ends of the shell are inclined, and a plurality of baffle plates which are arranged in a staggered mode are fixed to the inner wall of the shell. A plurality of heat exchange tubes are further arranged in the shell, and the heat exchange tubes penetrate through the baffle plates and the tube plates at the two ends to be communicated with the end sockets. According to the tubular heat exchanger provided by the utility model, the shell with two inclined ends is arranged, and the sleeve is additionally arranged on the outer side of the shell, so that the speed of hot fluid entering the shell is homogenized while the heat exchange tube near the tube plate is fully utilized, the heat exchange efficiency between the cold fluid and the hot fluid is improved, and the working efficiency of the tubular heat exchanger is improved.

Description

Technical Field

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

[0002] A heat exchanger is a device that transfers heat between two or more fluids with different temperatures. In industrial production, the main function of a heat exchanger is to transfer heat from a fluid with a higher temperature to a fluid with a lower temperature, so that the fluid temperature reaches the specified index of the process flow to meet the needs of the process conditions. Heat exchangers can be divided into many types according to their structures, such as tubular heat exchangers, spiral plate heat exchangers, plate-fin heat exchangers, and baffle rod heat exchangers. At present, the most widely used heat exchanger is the tubular heat exchanger, which is the most widely used heat exchanger in industrial process heat transfer.

[0003] However, in the prior art tubular heat exchangers, the hot fluid often directly enters the shell, which causes the hot fluid entering the shell to have inconsistent horizontal speeds, resulting in uneven distribution of the hot fluid in the shell. At the same time, due to the limitations of the shell structure (flanges, opening reinforcement, etc.), the inlet and outlet tube sheets of the hot fluid are far away, which in turn causes the heat exchange tubes near the tube sheets to be unable to fully contact the hot fluid. The above two situations seriously affect the heat exchange efficiency of the tubular heat exchanger. Utility Model Content

[0004] The utility model provides a tubular heat exchanger to solve the problem that the shell-side fluid in the tubular heat exchanger in the prior art has insufficient and uneven contact with the heat exchange tube when flowing in the heat exchanger, which leads to poor heat exchange effect between the cold and hot fluids and reduces the working efficiency of the tubular heat exchanger.

[0005] The utility model provides a tubular heat exchanger, comprising a horizontally placed shell, the two ends of which extend into two sleeves coaxially arranged with the shell, respectively, and the inner diameter of each sleeve is larger than the outer diameter of the shell. A tube sheet is fixedly connected to the side of each sleeve away from the shell, and each tube sheet is sealed and connected to a head. A fluid inlet and a fluid outlet are respectively provided on the two heads, a fluid inlet is provided on the top of the sleeve near the side of the fluid outlet, and a fluid outlet is provided on the bottom of the sleeve near the side of the fluid inlet. The two ends of the shell are inclined, the side near the fluid inlet and the fluid outlet is an inclined long end, and the side away from the fluid inlet and the fluid outlet is an inclined short end, and the inclined long end completely covers the fluid inlet and the fluid outlet. A plurality of baffles are fixedly connected to the inner wall of the shell, the baffle near the fluid inlet is fixedly connected to the end of the inclined short end, the baffle near the fluid outlet is fixedly connected to the end of the inclined long end, and the remaining plurality of baffles are staggered up and down. A plurality of heat exchange tubes are also arranged inside the shell, and the heat exchange tubes penetrate the baffles and the tube sheets at both ends and are connected with the heads.

[0006] Optionally, the baffle is a single-arch baffle, and the notch ends of the baffles at both ends of the shell are each fixedly connected with a guide plate, wherein the guide plate on the first baffle near the second fluid inlet is inclined upward along the fluid flow direction, and the guide plate on the first baffle near the second fluid outlet is inclined downward along the fluid flow direction. The angle between the baffle and the guide plate is 91-135°.

[0007] Optionally, except for the baffles located at both ends of the shell, the notch ends of the remaining baffles are symmetrically provided with two guide plates, and the guide plates are parallel to the adjacent guide plates on the previous baffle.

[0008] Optionally, a buffer slope is also provided at the angle between the baffle plate and the guide plate connected thereto.

[0009] Optionally, a first notch is provided at the top of the connection between the baffle and the shell, and a second notch is also provided at the connection between the two guide plates on the same baffle.

[0010] Optionally, a flushing water outlet is provided at the bottom of the sleeve near a fluid outlet side, and a flushing water inlet is provided at the top of the sleeve near a fluid inlet side.

[0011] Optionally, the distance between the end of the inclined long end of the shell and the tube sheet is 1 / 16-1 / 15 of the total length of the shell; the distance between the end of the inclined short end and the tube sheet is 1 / 12-1 / 10 of the total length of the shell.

[0012] Optionally, a plurality of fins are arranged in parallel on the heat exchange tube.

[0013] The tubular heat exchanger provided by the utility model, by setting a shell with inclined ends and installing a sleeve on the outside of the shell, fully utilizes the heat exchange tubes near the tube plate and at the same time equalizes the speed of the hot fluid entering the shell, thereby improving the efficiency of heat exchange between cold and hot fluids and improving the working efficiency of the tubular heat exchanger.

[0014] A guide plate is arranged at the notch end of the baffle, and the arrangement positions of the baffle and the guide plate are set. At the same time, a buffer slope is arranged at the angle between the baffle and the guide plate connected thereto, thereby reducing the probability of impurities in the hot fluid accumulating at the angle, increasing the service life of the tubular heat exchanger, and improving the renewal efficiency of the hot fluid in the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 An axonometric view of a tubular heat exchanger provided in one embodiment of the utility model;

[0017] Figure 2 A schematic diagram of the structure of a tubular heat exchanger provided in one embodiment of the utility model;

[0018] Figure 3 A schematic structural diagram of a tubular heat exchanger provided in another embodiment of the utility model;

[0019] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of A;

[0020] Figure 5 for Figure 3 Schematic diagram of the enlarged structure of B.

[0021] Description of reference numerals:

[0022] 1-shell, 2-sleeve, 3-tube sheet, 4-head, 5-baffle, 11-heat exchange tube, 21-second fluid inlet, 22-second fluid outlet, 23-flushing water inlet is provided on the top, 23-open flushing water inlet, 24-flushing water outlet, 41-first fluid inlet, 42-first fluid outlet, 51-guide plate, 52-buffer slope is provided, 52-buffer slope is provided at the angle, 53-first notch, 54-second notch. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the utility model.

[0024] The utility model provides a tubular heat exchanger, comprising a horizontally placed shell 1, wherein the two ends of the shell 1 extend into two sleeves 2 coaxially arranged with the shell 1, respectively, and the inner diameter of each sleeve 2 is larger than the outer diameter of the shell 1. A tube sheet 3 is fixedly connected to the side of each sleeve 2 away from the shell 1, and each tube sheet 3 is sealed with a head 4. A fluid inlet 41 and a fluid outlet 42 are respectively provided on the two heads 4, a fluid inlet 21 is provided at the top of the sleeve 2 near the fluid outlet 42, and a fluid outlet 22 is provided at the bottom of the sleeve 2 near the fluid inlet 41. The two ends of the shell 1 are inclined, the side near the fluid inlet 21 and the fluid outlet 22 is an inclined long end, and the side away from the fluid inlet 21 and the fluid outlet 22 is an inclined short end, and the inclined long end completely covers the fluid inlet 21 and the fluid outlet 22. A plurality of baffles 5 are fixedly connected to the inner wall of the shell 1, the baffle 5 near the second fluid inlet 21 is fixedly connected to the end of the inclined short end, the baffle 5 near the second fluid outlet 22 is fixedly connected to the end of the inclined long end, and the remaining baffles 5 are arranged in an up-and-down staggered manner. A plurality of heat exchange tubes 11 are also arranged inside the shell 1, and the heat exchange tubes 11 pass through the baffles 5 and the tube sheets 3 at both ends and communicate with the head 4.

[0025] like Figure 1 and Figure 2 As shown, during operation, the cold fluid enters the head 4 from the fluid inlet 1 41 on the head 4, enters the heat exchange tube 11 through the tube sheet 3, reaches the tube sheet 3 at the other end through the heat exchange tube 11, and flows out of the heat exchanger from the fluid outlet 1 42. Before the cold medium enters the heat exchange tube 11, the fluid inlet 21 needs to be opened in advance to allow the hot fluid to enter the shell 1 and preheat the heat exchange tube 11 therein, thereby ensuring the heating effect of the cold fluid. After the hot fluid enters the shell 1 through the fluid inlet 21, the overall flow pattern of the hot fluid is countercurrent with that of the cold fluid, which can improve the heat exchange efficiency between the cold and hot fluids. The hot fluid that has completed heating flows out of the shell 1 from the fluid outlet 22.

[0026] After passing through the second fluid inlet 21, the hot fluid first enters the sleeve 2. Under the action of the first baffle 5 set at the end of the shell 1, the hot fluid first fills the cavity between the first baffle 5 and the tube sheet 3, thereby ensuring that the heat exchange tubes near the tube sheet 3 and the hot fluid are in full contact. When the cavity between the first baffle 5 and the tube sheet 3 is filled, the hot fluid enters the shell 1 from the notch above the first baffle 5. Under the action of the multiple baffles 5 arranged in an interlaced manner, the hot fluid continuously flows between the heat exchange tubes 11. The hot fluid and the cold fluid flow in countercurrent as a whole. Between two adjacent baffles 5, the hot fluid and the cold fluid flow in a cross-flow, and multiple flow patterns coexist, thereby improving the heat exchange efficiency between the hot and cold fluids. When the hot fluid reaches the last baffle 5, it enters the sleeve 2 again from the notch above the baffle 5, and then flows through multiple heat exchange tubes 11 from top to bottom, and finally flows out from the second fluid outlet 22. The arrangement of the sleeve 2 fully utilizes the heat exchange tubes 11 near the tube sheet 3, thereby improving the heat exchange efficiency.

[0027] After the shell 1 is filled with hot fluid, the subsequent hot fluid continues to enter the shell 1 in two directions. One is to gradually move upward from the bottom of the sleeve 2, and enter the shell 1 after crossing the first baffle 5, and the other is to directly enter the shell 1 along the inclined upper end of the shell 1. Since the two ends of the shell 1 are inclined, the positions of the inclined ends have a certain horizontal difference, so the difference in the horizontal speed of the hot fluid that finally enters the shell 1 can be reduced, so that the temperature of the hot fluid at the same horizontal position is as consistent as possible, thereby improving the efficiency of heat exchange between cold and hot fluids.

[0028] like Figure 3 As shown, further, the baffle 5 is a single-bow baffle, and the notch ends of the baffles 5 located at both ends of the shell 1 are each fixedly connected with a guide plate 51, wherein the guide plate 51 on the first baffle 5 near the second fluid inlet 21 is inclined upward along the fluid flow direction, and the guide plate 51 on the baffle 5 near the second fluid outlet 22 is inclined downward along the fluid flow direction. The angle between the baffle 5 and the guide plate 51 is 91-135°. Further, except for the baffles 5 located at both ends of the shell 1, the notch ends of the remaining baffles 5 are symmetrically provided with two guide plates 51. The guide plate 51 is parallel to the adjacent guide plate 51 on the previous baffle 5.

[0029] The guide plate 51 is arranged at the notch end of the baffle plate 5, which can continuously change the flow direction of the hot fluid in the shell 1, prolong the residence time of the hot fluid in the shell 1, increase the heat exchange time between the cold and hot fluids, and improve the working efficiency of the tubular heat exchanger. The guide plate 51 on the baffle plate 5 at the fluid inlet is inclined upward along the fluid flow direction, and the guide plate 51 on the baffle plate 5 at the fluid outlet is inclined downward along the fluid flow direction, so that the hot fluid can fully flow through every location in the shell 1, improve the renewal efficiency of the hot fluid, and thus improve the working efficiency of the tubular heat exchanger.

[0030] When the angle between the baffle 5 and the guide plate 51 is too small, a heat exchange dead zone will be generated at the angle, reducing the efficiency of heat exchange. At the same time, a too small angle will easily cause impurities in the fluid to accumulate, which is not conducive to heat transfer. When the angle is too large, the resistance of the guide plate 51 to the hot fluid is too large, which is not conducive to heat transfer. Therefore, the angle between the stacking baffle 5 and the guide plate 51 is set to 91-135°, so as to effectively improve the heat transfer effect.

[0031] like Figure 4 As shown, further, a buffer slope 52 is provided at the angle between the baffle plate 5 and the guide plate 51 connected thereto.

[0032] A buffer slope 52 is provided at the angle between the baffle plate 5 and the guide plate 51 connected thereto, so as to further reduce the probability of impurities in the hot fluid being accumulated at the angle, thereby increasing the service life of the tubular heat exchanger.

[0033] like Figure 4 and Figure 5 As shown, further, a first notch 53 is provided at the top of the connection between the baffle plate 5 and the shell 1 , and a second notch 54 is provided at the connection between the two guide plates 51 on the same baffle plate 5 .

[0034] A first notch 53 is provided at the top of the baffle plate 5 on one side close to the inner wall of the shell 1, so that when the tubular heat exchanger is inspected and repaired, the fluid in the shell 1 can be drained as cleanly as possible to avoid the residual fluid from affecting the inspection result. A second notch 54 is also provided at the connection between the two guide plates 51 on the same baffle plate 5. This is to drain the liquid in the concave part of the Y-shaped structure formed by the baffle plate 5 and the guide plate 51 during inspection and repair.

[0035] The purpose of providing a notch at the connection between each baffle plate 5 and the two guide plates 51 on each baffle plate 5 is to facilitate maintenance and installation, without distinguishing between the upper and lower baffle plates 5, thereby reducing the difficulty of installation. In addition, the openings of the first notch 53 and the second notch 54 are relatively small and do not affect the flow of the hot fluid.

[0036] like Figure 3As shown, further, a flushing water outlet 24 is provided at the bottom of the sleeve 2 near the fluid outlet 42 , and a flushing water inlet 23 is provided at the top of the sleeve 2 near the fluid inlet 41 .

[0037] When the shell 1 needs to be cleaned, the second fluid inlet 21 and the second fluid outlet 22 are closed, and the flushing water inlet 23 and the flushing water outlet 24 are opened to backwash the inside of the shell 1. The flushing process is the same as the process of heat fluid entering the shell 1 for heat transfer, which will not be repeated here.

[0038] Furthermore, the distance between the end of the inclined long end of the shell 1 and the tube sheet 3 is 1 / 16-1 / 15 of the total length of the shell 1 ; the distance between the end of the inclined short end and the tube sheet 3 is 1 / 12-1 / 10 of the total length of the shell 1 .

[0039] Furthermore, a plurality of fins are arranged in parallel on the heat exchange tube 11 .

[0040] The present invention is further described in detail below in conjunction with specific embodiments.

[0041] Example 1

[0042] When the tubular heat exchanger is working, the cold fluid enters the head 4 from the fluid inlet 41 on the head 4, enters the heat exchange tube 11 through the tube sheet 3, reaches the tube sheet 3 at the other end through the heat exchange tube 11, and flows out of the heat exchanger from the fluid outlet 42. Before the cold medium enters the heat exchange tube 11, the fluid inlet 21 needs to be opened in advance to allow the hot fluid to enter the shell 1 and preheat the heat exchange tube 11 therein, thereby ensuring the heating effect of the cold fluid. After the hot fluid enters the shell 1 through the fluid inlet 21, the overall flow pattern of the hot fluid is countercurrent with that of the cold fluid, which can improve the heat exchange efficiency between the cold and hot fluids. The hot fluid that has completed heating flows out of the shell 1 from the fluid outlet 22.

[0043] After passing through the second fluid inlet 21, the hot fluid first enters the sleeve 2. Under the action of the first baffle 5 set at the end of the shell 1, the hot fluid first fills the cavity between the first baffle 5 and the tube sheet 3, thereby ensuring that the heat exchange tubes near the tube sheet 3 and the hot fluid are in full contact. When the cavity between the first baffle 5 and the tube sheet 3 is filled, the hot fluid enters the shell 1 from the notch above the first baffle 5. Under the action of the multiple baffles 5 arranged in an interlaced manner, the hot fluid continuously flows between the heat exchange tubes 11. The hot fluid and the cold fluid flow in countercurrent as a whole. Between two adjacent baffles 5, the hot fluid and the cold fluid flow in a cross-flow, and multiple flow patterns coexist, thereby improving the heat exchange efficiency between the hot and cold fluids. When the hot fluid reaches the last baffle 5, it enters the sleeve 2 again from the notch above the baffle 5, and then flows through multiple heat exchange tubes 11 from top to bottom, and finally flows out from the second fluid outlet 22. The arrangement of the sleeve 2 fully utilizes the heat exchange tubes 11 near the tube sheet 3, thereby improving the heat exchange efficiency.

[0044] After the shell 1 is filled with hot fluid, the subsequent hot fluid continues to enter the shell 1 in two directions. One is to gradually move upward from the bottom of the sleeve 2, and enter the shell 1 after crossing the first baffle 5, and the other is to directly enter the shell 1 along the inclined upper end of the shell 1. Since the two ends of the shell 1 are inclined, the positions of the inclined ends have a certain horizontal difference, so the difference in the horizontal speed of the hot fluid that finally enters the shell 1 can be reduced, so that the temperature of the hot fluid at the same horizontal position is as consistent as possible, thereby improving the efficiency of heat exchange between cold and hot fluids.

[0045] Example 2

[0046] On the basis of Example 1, Example 2 provides a structure and a specific working principle for further improving the working efficiency of the tubular heat exchanger: a guide plate 51 is provided at the notch end of the baffle plate 5, which can continuously change the flow direction of the hot fluid in the shell 1, prolong the residence time of the hot fluid in the shell 1, increase the heat exchange time between the cold and hot fluids, and improve the working efficiency of the tubular heat exchanger. The guide plate 51 on the baffle plate 5 at the fluid inlet is inclined upward along the fluid flow direction, and the guide plate 51 on the baffle plate 5 at the fluid outlet is inclined downward along the fluid flow direction, so that the hot fluid can fully flow through every location in the shell 1, improve the renewal efficiency of the hot fluid, and thus improve the working efficiency of the tubular heat exchanger.

[0047] When the angle between the baffle 5 and the guide plate 51 is too small, a heat exchange dead zone will be generated at the angle, reducing the efficiency of heat exchange. At the same time, a too small angle will easily cause impurities in the fluid to accumulate, which is not conducive to heat transfer. When the angle is too large, the resistance of the guide plate 51 to the hot fluid is too large, which is not conducive to heat transfer. Therefore, the angle between the stacking baffle 5 and the guide plate 51 is set to 91-135°, so as to effectively improve the heat transfer effect.

[0048] A buffer slope 52 is provided at the angle between the baffle plate 5 and the guide plate 51 connected thereto, so as to further reduce the probability of impurities in the hot fluid being accumulated at the angle, thereby increasing the service life of the tubular heat exchanger.

[0049] Example 3

[0050] Embodiment 3 also provides a device structure for improving maintenance efficiency and cleaning the shell 1: a first notch 53 is provided at the top of the baffle 5 near the inner wall of the shell 1, so that when the tubular heat exchanger is being repaired, the fluid in the shell 1 can be drained as cleanly as possible to avoid the residual fluid from affecting the maintenance result. A second notch 54 is also provided at the connection between the two guide plates 51 on the same baffle 5. This is to drain the liquid in the depression of the Y-shaped structure formed by the baffle 5 and the guide plate 51 during maintenance.

[0051] The purpose of providing a notch at the connection between each baffle plate 5 and the two guide plates 51 on each baffle plate 5 is to facilitate maintenance and installation, without distinguishing between the upper and lower baffle plates 5, thereby reducing the difficulty of installation. In addition, the openings of the first notch 53 and the second notch 54 are relatively small and do not affect the flow of the hot fluid.

[0052] A flushing water outlet 24 is provided at the bottom of the sleeve 2 near the fluid first outlet 42, and a flushing water inlet 23 is provided at the top of the sleeve 2 near the fluid first inlet 41. When the housing 1 needs to be cleaned, the fluid second inlet 21 and the fluid second outlet 22 are closed, and the flushing water inlet 23 and the flushing water outlet 24 are opened to backwash the interior of the housing 1.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it; although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A tubular heat exchanger, characterized in that: The invention comprises a shell (1) placed horizontally, wherein the two ends of the shell (1) extend into two sleeves (2) coaxially arranged with the shell (1), and the inner diameter of each sleeve (2) is larger than the outer diameter of the shell (1); a tube sheet (3) is fixedly connected to the side of each sleeve (2) away from the shell (1), and each tube sheet (3) is sealedly connected to a head (4); a fluid inlet (41) and a fluid outlet (42) are respectively provided on the two heads (4), and a fluid outlet (42) is provided near the fluid outlet (42). The top of the sleeve (2) on the side is provided with a second fluid inlet (21), and the bottom of the sleeve (2) on the side close to the first fluid inlet (41) is provided with a second fluid outlet (22); the two ends of the shell (1) are inclined, the side close to the second fluid inlet (21) and the second fluid outlet (22) is an inclined long end, and the side away from the second fluid inlet (21) and the second fluid outlet (22) is an inclined short end, and the inclined long end completely covers the second fluid inlet (21) and the second fluid outlet (22); A plurality of baffles (5) are fixedly connected to the inner wall of the shell (1); the baffle (5) close to the second fluid inlet (21) is fixedly connected to the end of the inclined short end, the baffle (5) close to the second fluid outlet (22) is fixedly connected to the end of the inclined long end, and the remaining plurality of baffles (5) are arranged in an alternating manner up and down; a plurality of heat exchange tubes (11) are also arranged inside the shell (1); the heat exchange tubes (11) pass through the baffles (5) and the tube sheets (3) at both ends and are connected to the head (4).

2. The tubular heat exchanger according to claim 1, characterized in that: The baffle (5) is a single-arched baffle, and the notched ends of the baffle (5) located at both ends of the shell (1) are each fixedly connected to a guide plate (51), wherein the guide plate (51) on the first baffle (5) near the second fluid inlet (21) is inclined upward along the fluid flow direction, and the guide plate (51) on the first baffle (5) near the second fluid outlet (22) is inclined downward along the fluid flow direction; The included angle between the baffle plate (5) and the guide plate (51) is 91-135°.

3. The tubular heat exchanger according to claim 2, characterized in that: Except for the baffles (5) located at both ends of the shell (1), the notched ends of the remaining baffles (5) are symmetrically provided with two guide plates (51); The guide plate (51) is parallel to the adjacent guide plate (51) on the previous baffle plate (5).

4. The tubular heat exchanger according to claim 2, characterized in that: A buffer slope (52) is also provided at the angle between the baffle plate (5) and the guide plate (51) connected thereto.

5. The tubular heat exchanger according to claim 2, characterized in that: A first notch (53) is provided at the top of the connection between the baffle plate (5) and the shell (1), and a second notch (54) is also provided at the connection between the two guide plates (51) on the same baffle plate (5).

6. The tubular heat exchanger according to claim 1, characterized in that: A flushing water outlet (24) is provided at the bottom of the sleeve (2) near the fluid outlet (42), and a flushing water inlet (23) is provided at the top of the sleeve (2) near the fluid inlet (41).

7. The tubular heat exchanger according to claim 1, characterized in that: The distance between the end of the inclined long end of the shell (1) and the tube sheet (3) is 1 / 16-1 / 15 of the total length of the shell (1); the distance between the end of the inclined short end and the tube sheet (3) is 1 / 12-1 / 10 of the total length of the shell (1).

8. The tubular heat exchanger according to any one of claims 1 to 7, characterized in that: A plurality of fins are arranged in parallel on the heat exchange tube (11).

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