Shell-and-tube heat exchanger

Abstract

The invention discloses a shell-and-tube heat exchanger, which relates to the technical field of heat exchangers and comprises a shell, a first end cover, a second end cover, a plurality of heat exchange tubes and fluid guide tubes, the shell is of a cylindrical structure, a cold fluid inlet and a cold fluid outlet are formed in the side walls of the two ends of the shell respectively, a first end cover and a second end cover are arranged at the two ends of the shell, tube plates are arranged between the first end cover and the shell and between the second end cover and the shell, a hot fluid inlet is formed in the first end cover, and a hot fluid outlet is formed in the second end cover. The heat exchange tubes are arranged in the shell, the two ends of each heat exchange tube are connected to the tube plate so as to communicate with the first end cover and the second end cover, and a plurality of annular fins of an annular structure are arranged on the outer circumference of each heat exchange tube at intervals in the axial direction of the heat exchange tube; the fluid guide pipe is inserted into the hot fluid inlet and extends in the axial direction till abutting against the inner wall of the first end cover, and a plurality of through holes are formed in the side wall, close to the heat exchange pipe, of the fluid guide pipe. Therefore, the heat exchange efficiency of the heat exchanger can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, and in particular to a shell and tube heat exchanger. Background Art

[0002] As one of the major countries in the world in oil production and consumption, my country's oil consumption is continuing to increase, but oil is a non-renewable resource and its availability is gradually decreasing. Therefore, how to save and optimize the use of oil resources has become an urgent problem to be solved. Oil and gas recovery technology can effectively recycle useful substances in oil and gas, reduce the emission of harmful substances, and avoid negative impacts on the ecological environment. Therefore, the application of oil and gas recovery technology not only meets the requirements of environmental protection, but also can bring positive effects to enterprises in reducing environmental protection costs, eliminating potential accidents, and improving economic benefits.

[0003] The use of heat exchangers to recover oil and gas is essentially based on the principle of condensation. Hot oil and gas are passed into the heat exchanger to exchange heat with the cold medium in the heat exchanger, thereby reducing the temperature of the oil and gas to the expected temperature and recovering it. This method mainly relies on the physical properties of oil and gas resources to recover oil and gas resources. Oil and gas resources contain many types of components, and different components have different requirements for condensation temperature. Therefore, by cooling the oil and gas resources, hydrocarbon gases with high boiling points can be separated and then processed into oil and gas products.

[0004] Therefore, how to improve the heat exchange efficiency of the heat exchanger is a technical problem that technicians in this field currently need to solve. Summary of the invention

[0005] The object of the present invention is to provide a shell and tube heat exchanger which can improve the heat exchange efficiency of the heat exchanger.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A shell and tube heat exchanger, comprising:

[0008] The shell is a cylindrical structure, and the side walls at both ends are respectively provided with a cold fluid inlet and a cold fluid outlet, a first end cover and a second end cover are provided at both ends of the shell, a tube sheet is provided between the first end cover and the shell, and between the second end cover and the shell, a hot fluid inlet is provided on the first end cover, and a hot fluid outlet is provided on the second end cover;

[0009] A plurality of heat exchange tubes are arranged inside the shell, and both ends of the heat exchange tubes are connected to the tube sheet to communicate with the first end cover and the second end cover. A plurality of annular fins in an annular structure are arranged on the outer circumference of the heat exchange tubes at intervals along the axial direction thereof;

[0010] The fluid guide pipe is inserted into the hot fluid inlet and extends along its axial direction until it abuts against the inner wall of the first end cover. The side wall of the fluid guide pipe close to the heat exchange tube is provided with a plurality of through holes.

[0011] Preferably, a heat exchange cavity is formed between the inner wall of the shell and the outer wall of the heat exchange tube, and a plurality of groups of baffles are arranged at intervals and staggered on the inner wall of the shell. The baffles are sleeved on the outer periphery of the heat exchange tube, and are used to force the cold fluid to flow in an S shape in the heat exchange cavity.

[0012] Preferably, the first end cover and the cold fluid inlet are arranged at the same end of the shell, the second end cover and the cold fluid outlet are arranged at the same end of the shell, the cold fluid inlet is arranged at the bottom of the shell, and the cold fluid outlet is arranged at the top of the shell.

[0013] Preferably, the hot fluid inlet and the cold fluid outlet are arranged on the same side, and the hot fluid outlet and the cold fluid inlet are arranged on the same side.

[0014] Preferably, a gap is left between any two adjacent heat exchange tubes.

[0015] Preferably, the baffle is connected to the inner wall of the shell by welding.

[0016] Preferably, a plurality of annular fins are arranged on the circumference of the fluid guide tube.

[0017] Preferably, heat dissipation ribs perpendicular to the annular fins are arranged on the circumference of the heat exchange tube.

[0018] Preferably, the shell, the first end cover, the second end cover and the fluid guide tube are all made of stainless steel.

[0019] Preferably, the heat exchange tube is made of stainless steel or copper, and the annular fin is made of copper.

[0020] With respect to the above background technology, the present invention provides a shell and tube heat exchanger, comprising: a shell, a first end cover, a second end cover, a plurality of heat exchange tubes and a fluid guide tube; the shell is a cylindrical structure, and the side walls at both ends thereof are respectively provided with a cold fluid inlet and a cold fluid outlet, a first end cover and a second end cover are provided at both ends of the shell, and tube sheets are provided between the first end cover and the shell, and between the second end cover and the shell, a hot fluid inlet is provided on the first end cover, and a hot fluid outlet is provided on the second end cover; a plurality of heat exchange tubes are arranged inside the shell, and both ends of the heat exchange tubes are connected to the tube sheets to connect the first end cover and the second end cover, and a plurality of annular fins in an annular structure are arranged on the outer circumference of the heat exchange tube along the axial direction thereof; the fluid guide tube is inserted into the hot fluid inlet, and extends along the axial direction thereof until it abuts against the inner wall of the first end cover, and a plurality of through holes are provided on the side wall of the fluid guide tube close to the heat exchange tube.

[0021] Specifically, the hot fluid is introduced into the first end cover, and then flows out from the second end cover through the heat exchange tube. At the same time, in order to exchange heat with the hot fluid in the heat exchange tube, a cold fluid is introduced into the shell, and the cold fluid exchanges heat with the hot fluid in the heat exchange tube. In order to increase the contact area between the heat exchange tube and the cold fluid, the present application arranges a plurality of groups of annular fins with an annular structure at intervals on the outer circumference of the heat exchange tube. The presence of the annular fins will greatly improve the heat exchange efficiency of the heat exchange tube. In addition, the present application inserts a fluid guide tube at the hot fluid inlet. The fluid guide tube will quickly diffuse the hot fluid introduced into the first end cover to the surroundings, so that the hot fluid can be directly introduced into different heat exchange tubes. This solves the problem that the traditional heat exchanger first hits the bottom after the hot fluid is introduced and then diffuses to the surroundings of the first end cover, resulting in uneven speed of the hot fluid entering the heat exchange tube, resulting in insufficient heat exchange, thereby improving the heat exchange efficiency of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention 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 only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] FIG1 is a schematic diagram of the overall structure of a shell and tube heat exchanger provided in an embodiment of the present invention;

[0024] FIG2 is a cross-sectional view of FIG1 ;

[0025] FIG3 is a schematic diagram of the heat exchange tube structure provided by an embodiment of the present invention;

[0026] FIG4 is a schematic diagram of the annular fin structure provided by an embodiment of the present invention;

[0027] FIG5 is a schematic diagram of the structure of a first end cover provided in an embodiment of the present invention;

[0028] FIG. 6 is a schematic diagram of baffle distribution provided in an embodiment of the present invention.

[0029] in:

[0030] 100-shell, 110-cold fluid inlet, 120-cold fluid outlet, 130-tube sheet;

[0031] 200 - first end cover, 210 - hot fluid inlet;

[0032] 300 - second end cover, 310 - hot fluid outlet;

[0033] 400-heat exchange tube, 410-annular fin, 420-baffle;

[0034] 500-fluid guide tube, 510-through hole. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “backward”, “left” and “right” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the positions or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limitations of the present invention.

[0038] The object of the present invention is to provide a shell and tube heat exchanger which can improve the heat exchange efficiency of the heat exchanger.

[0039] To achieve the above object, the present invention provides the following technical solutions:

[0040] Referring to Figures 1 to 6, a shell and tube heat exchanger is provided in this embodiment, including: a shell 100, a first end cover 200, a second end cover 300, a plurality of heat exchange tubes 400 and a fluid guide tube 500; the shell 100 is a cylindrical structure, and the side walls at both ends thereof are respectively provided with a cold fluid inlet 110 and a cold fluid outlet 120, and the first end cover 200 and the second end cover 300 are provided at both ends of the shell 100, and a tube sheet 130 is provided between the first end cover 200 and the shell 100, and between the second end cover 300 and the shell 100, and a heat exchange tube 110 is provided on the first end cover 200. A fluid inlet 210 and a hot fluid outlet 310 are provided on the second end cover 300; a plurality of heat exchange tubes 400 are arranged inside the shell 100, and both ends of the heat exchange tubes 400 are connected to the tube sheet 130 to connect the first end cover 200 and the second end cover 300, and a plurality of annular fins 410 with an annular structure are arranged on the outer circumference of the heat exchange tube 400 at intervals along its axial direction; a fluid guide tube 500 is inserted into the hot fluid inlet 210 and extends along its axial direction until it abuts against the inner wall of the first end cover 200, and a plurality of through holes 510 are provided on the side wall of the fluid guide tube 500 close to the heat exchange tube 400.

[0041] As shown in Figures 1 and 2, the shell 100 in this embodiment is specifically a cylindrical tube-shaped structure, and a cold fluid inlet 110 and a cold fluid outlet 120 are respectively opened at its two ends, wherein the two ends of the shell 100 are sealed by a circular tube sheet 130, so that a cavity that can accommodate the cold fluid is formed inside the shell 100. Specifically, the circular tube sheet 130 can be installed at both ends of the shell 100 by welding; and inside the shell 100, a plurality of heat exchange tubes 400 are installed along the axial direction thereof, and each heat exchange tube 400 is connected between two tube sheets 130, and corresponding holes are opened on the tube sheets 130 to connect the heat exchange tubes 400. At the same time, a first end cover 200 and a second end cover 300 with a cylindrical structure are arranged on both sides of the tube sheet 130, and the first end cover 200 and the second end cover 300 are Both end covers 300 are hollow structures, and the spaces inside the two are connected through the heat exchange tube 400. In the present embodiment, a hot fluid inlet 210 is provided on the first end cover 200, and a hot fluid outlet 310 is provided on the second end cover 300. Therefore, the heat exchanger in the present embodiment forms two independent fluid channels, one of which is for the cold fluid to flow through, that is, the cold fluid will enter from the cold fluid inlet 110 and flow out from the cold fluid outlet 120, and the other is for the hot fluid to pass through, that is, from the hot fluid inlet 210, through the heat exchange tube 400, and flow out from the hot fluid outlet 310. It should be noted that the heat exchange tube 400 is arranged inside the shell 100, and it will be wrapped by the cold fluid flowing through it, and the cold fluid will absorb the heat of the hot fluid flowing through the heat exchange tube 400, so as to achieve a heat exchange effect.

[0042] At the same time, in order to enhance the heat exchange effect, in the present embodiment, firstly, a plurality of groups of annular fins 410 for heat exchange are arranged on the outer circumference of each heat exchange tube 400, as shown in FIGS. 3 and 4 , the annular fins 410 can increase the area of ​​the side with low thermal resistance and increase the overall heat transfer coefficient. At the same time, it has the advantages of small size, small footprint, and low maintenance cost, which can enhance the heat transfer process of the heat exchanger and improve the heat exchange performance.

[0043] In addition, in this embodiment, a fluid guide pipe 500 is also provided at the hot fluid inlet 210. Specifically, as shown in FIG5 , the fluid guide pipe 500 is a cylindrical structure, and a plurality of through holes 510 are provided on the side close to the tube sheet 130. The fluid guide pipe 500 allows the hot fluid to directly enter the fluid guide pipe 500 when it enters the heat exchanger from the hot fluid inlet 210, and the fluid is quickly introduced into the heat exchange tube 400 by the fluid guide pipe 500. This solves the problem that the traditional heat exchanger first impacts the bottom after the fluid enters and then diffuses around the end cover, resulting in excessive dispersion of the fluid in the first end cover 200 and uneven speed when entering the heat exchange tube 400, resulting in insufficient heat exchange; and the number and angle of the holes on the fluid guide pipe 500 can also be adjusted according to different flow requirements.

[0044] In other words, the hot fluid is introduced into the first end cover 200, and then flows out of the second end cover 300 through the heat exchange tube 400. At the same time, in order to exchange heat with the hot fluid in the heat exchange tube 400, a cold fluid is introduced into the shell 100, and the cold fluid exchanges heat with the hot fluid in the heat exchange tube 400. In order to increase the contact area between the heat exchange tube 400 and the cold fluid, a plurality of groups of annular fins 410 with an annular structure are arranged at intervals on the outer circumference of the heat exchange tube 400. The presence of the annular fins 410 will greatly improve the heat exchange efficiency. The heat exchange efficiency of the heat pipe 400 is improved; in addition, the present application inserts a fluid guide tube 500 at the hot fluid inlet 210, and the fluid guide tube 500 will quickly diffuse the hot fluid introduced into the first end cover 200 to the surroundings, so that the hot fluid can be directly introduced into different heat exchange tubes 400. This solves the problem that the traditional heat exchanger, after the hot fluid is introduced, first impacts the bottom and then diffuses to the surroundings of the first end cover 200, resulting in uneven speed of the hot fluid entering the heat exchange tube 400, thereby causing insufficient heat exchange, thereby improving the heat exchange efficiency of the heat exchanger.

[0045] Preferably, a heat exchange chamber is formed between the inner wall of the shell 100 and the outer wall of the heat exchange tube 400, and a plurality of groups of baffles 420 are spaced and staggered on the inner wall of the shell 100. The baffles 420 are sleeved on the outer periphery of the heat exchange tube 400, and are used to force the cold fluid to flow in an S shape in the heat exchange chamber.

[0046] As shown in FIG2 , in this embodiment, the space between the inside of the shell 100 and the outside of the heat exchange tube 400 is a heat exchange cavity. In order to prolong the contact time between the cold fluid and the heat exchange tube 400 in the heat exchange cavity and thereby increase the heat exchange efficiency between the two, a plurality of baffles 420 are provided on the inner wall of the shell 100. Specifically, the baffles 420 are provided with holes for passing the heat exchange tube 400, and these holes can just pass through the heat exchange tube 400. These baffles 420 are not only perpendicular to the axial direction of the heat exchange tube 400, but also staggered at the top and bottom of the inner wall of the shell 100. It should be noted that the distance that the baffles 420 extend toward the side wall opposite to the shell 100 exceeds the radius of the shell 100. In this way, the cold fluid cannot flow in a straight line inside the heat exchange cavity. Due to the obstruction of the baffles 420, it will flow in the heat exchange cavity in an S shape. The specific distribution of the baffles 420 is shown in FIG6 .

[0047] In addition, the baffle 420 also has the function of forming the heat exchange tube 400. It can be understood that since the heat exchange tube has a certain length, but only its two ends are fixed and supported, the baffle 420 is arranged inside the shell 100 and located between the two tube sheets 130, which can play a supporting role in the clustering of the heat exchange tubes 400.

[0048] In this embodiment, the baffle 420 is installed inside the housing 100 by welding, and it can also be connected to the housing 100 by other means, which is not specifically limited herein.

[0049] Furthermore, the first end cover 200 and the cold fluid inlet 110 are arranged at the same end of the shell 100, the second end cover 300 and the cold fluid outlet 120 are arranged at the same end of the shell 100, the cold fluid inlet 110 is arranged at the bottom of the shell 100, and the cold fluid outlet 120 is arranged at the top of the shell 100.

[0050] It can be understood that in order to enhance the heat exchange effect between the hot fluid and the cold fluid, the cold fluid inlet 110 is arranged at the bottom of the shell 100, and the cold fluid outlet 120 is arranged at the top of the shell 100. This arrangement can ensure that the entire shell 100 is filled with fluid and extend the residence time of the cold fluid in the heat exchange chamber, thereby improving the heat exchange efficiency between it and the hot fluid in the heat exchange tube 400.

[0051] Preferably, in the present embodiment, the hot fluid inlet 210 and the cold fluid inlet 110 are arranged at the same end of the shell 100, and the hot fluid outlet 310 and the cold fluid outlet 120 are arranged at the other end of the shell 100. This is only one way of fluid introduction, and the end where the hot fluid inlet 210 is located can also be changed according to actual conditions, that is, the direction of hot fluid introduction can be changed, which is not specifically limited in this article.

[0052] Further, the hot fluid inlet 210 and the cold fluid outlet 120 are arranged on the same side, and the hot fluid outlet 310 and the cold fluid inlet 110 are arranged on the same side.

[0053] In this embodiment, as shown in Figure 1, the hot fluid inlet 210 and the cold fluid outlet 120 are respectively arranged on the top of the first end cover 200 and the shell 100, while the hot fluid outlet 310 and the cold fluid inlet 110 are both arranged on the bottom of the second end cover 300 and the shell 100. Therefore, the flow direction of the cold fluid is from bottom to top, which can ensure that the entire shell 100 is filled with fluid, and the flow direction of the hot fluid is from top to bottom, which can ensure smooth circulation of the hot fluid and can ensure that the hot fluid can quickly pass into the heat exchange tube 400.

[0054] Preferably, a gap is left between any two adjacent heat exchange tubes 400 .

[0055] It can be understood that in order to facilitate the flow of cold fluid inside the heat exchange chamber, it is necessary to ensure that the heat exchange tube 400 bundled in this embodiment has a gap for the fluid channel to pass through, that is, there is a certain gap between any two adjacent heat exchange tubes 400, and the size of the gap needs to be able to ensure the installation of the annular fin 410.

[0056] Preferably, the baffle 420 is connected to the inner wall of the housing 100 by welding.

[0057] It can be understood that this connection method is stable and can reduce the difficulty of installing the baffle 420 and reduce the processing cost of the entire heat exchanger.

[0058] Preferably, a plurality of annular fins 410 are provided on the circumference of the fluid guide tube 500 .

[0059] In another embodiment, a plurality of annular fins 410 may also be provided on the circumference of the fluid guide tube 500. Thus, the hot fluid introduced into the fluid guide tube 500 will be quickly dispersed by the annular fins 410 after flowing out from the through hole 510, so that the hot fluid can be passed into different heat exchange tubes 400 in the heat exchange tube 400, thereby improving the heat exchange efficiency of the heat exchanger.

[0060] Preferably, heat dissipation ribs perpendicular to the annular fins 410 are provided on the circumference of the heat exchange tube 400 .

[0061] In another embodiment, a plurality of heat dissipation ribs perpendicular to the annular fins 410 may be arranged on the circumference of the heat exchange tube 400. Such an arrangement may further enhance the contact area between the heat exchange tube 400 and the cold fluid, thereby enhancing the heat exchange efficiency of the two, thereby improving the heat exchange efficiency of the heat exchanger.

[0062] Preferably, the shell 100 , the first end cover 200 , the second end cover 300 and the fluid guide tube 500 are all made of stainless steel.

[0063] In this embodiment, the shell 100, the first end cover 200, the second end cover 300 and the fluid guide tube 500 are preferably made of stainless steel, which is strong, economical, practical, corrosion-resistant and has a high thermal conductivity.

[0064] Furthermore, the heat exchange tube 400 is made of stainless steel or copper, and the annular fin 410 is made of copper.

[0065] In order to increase the heat exchange efficiency of the heat exchanger, the material of the heat exchange tube 400 and the annular fin 410 may preferably be copper with a higher heat transfer coefficient, but in order to reduce costs, the material of the heat exchange tube 400 may also be stainless steel.

[0066] Of course, the materials of the shell 100 , the first end cover 200 , the second end cover 300 , the fluid guide tube 500 , the heat exchange tube 400 and the annular fin 410 may also be adjusted according to actual conditions, as long as the requirements can be met.

[0067] In summary, this article provides a shell and tube heat exchanger, which introduces a fluid guide tube 500 at the fluid inlet, so that the hot fluid directly enters the fluid guide tube 500 when it enters the heat exchanger from the hot fluid inlet 210, and the fluid is quickly introduced into the heat exchange tube 400 by the fluid guide tube 500, thereby solving the problem that the hot fluid first hits the bottom after entering the traditional heat exchanger and then diffuses around the first end cover 200, resulting in uneven speed of the hot fluid entering the heat exchange tube 400 and insufficient heat exchange; in addition, by arranging annular fins 410 on the heat exchange tube 400, the heat exchange area is increased, the heat transfer process of the heat exchanger is strengthened, and the heat exchange performance is improved; therefore, the heat exchanger provided in this article significantly improves the heat exchange efficiency compared with the traditional heat exchanger.

[0068] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0069] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0070] The embodiments provided by the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A shell and tube heat exchanger, characterized in that: include: The shell (100) is a cylindrical structure, and the side walls at both ends thereof are respectively provided with a cold fluid inlet (110) and a cold fluid outlet (120); a first end cover (200) and a second end cover (300) are provided at both ends of the shell (100); a tube sheet (130) is provided between the first end cover (200) and the shell (100), and between the second end cover (300) and the shell (100); a hot fluid inlet (210) is provided on the first end cover (200), and a hot fluid outlet (310) is provided on the second end cover (300); A plurality of heat exchange tubes (400) are arranged inside the shell (100), and both ends of the heat exchange tubes are connected to the tube sheet (130) to connect the first end cover (200) and the second end cover (300); a plurality of annular fins (410) in an annular structure are arranged at intervals along the axial direction of the outer circumference of the heat exchange tube (400); The fluid guide tube (500) is inserted into the hot fluid inlet (210) and extends along its axial direction until it abuts against the inner wall of the first end cover (200). The side wall of the fluid guide tube (500) close to the heat exchange tube (400) is provided with a plurality of through holes (510).

2. The shell and tube heat exchanger according to claim 1, characterized in that: A heat exchange cavity is formed between the inner wall of the shell (100) and the outer wall of the heat exchange tube (400). A plurality of groups of baffles (420) are arranged at intervals and in an alternating manner on the inner wall of the shell (100). The baffles (420) are sleeved on the outer circumference of the heat exchange tube (400). The baffles (420) are used to force the cold fluid to flow in an S-shape in the heat exchange cavity.

3. The shell and tube heat exchanger according to claim 2, characterized in that: The first end cover (200) and the cold fluid inlet (110) are arranged at the same end of the shell (100), the second end cover (300) and the cold fluid outlet (120) are arranged at the same end of the shell (100), the cold fluid inlet (110) is arranged at the bottom of the shell (100), and the cold fluid outlet (120) is arranged at the top of the shell (100).

4. The shell and tube heat exchanger according to claim 3, characterized in that: The hot fluid inlet (210) and the cold fluid outlet (120) are arranged on the same side, and the hot fluid outlet (310) and the cold fluid inlet (110) are arranged on the same side.

5. The shell and tube heat exchanger according to claim 4, characterized in that: A gap is left between any two adjacent heat exchange tubes (400).

6. The shell and tube heat exchanger according to claim 2, characterized in that: The baffle (420) is connected to the inner wall of the housing (100) by welding.

7. The shell and tube heat exchanger according to claim 4, characterized in that: A plurality of annular fins (410) are arranged on the circumference of the fluid guide tube (500).

8. The shell and tube heat exchanger according to claim 1, characterized in that: A heat dissipation rib plate perpendicular to the annular fin (410) is arranged on the circumference of the heat exchange tube (400).

9. The shell and tube heat exchanger according to any one of claims 1 to 8, characterized in that: The shell (100), the first end cover (200), the second end cover (300) and the fluid guide tube (500) are all made of stainless steel.

10. The shell and tube heat exchanger according to any one of claims 1 to 8, characterized in that: The heat exchange tube (400) is made of stainless steel or copper, and the annular fin (410) is made of copper.

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