Tubular heat exchanger

Abstract

The invention discloses a tubular heat exchanger which comprises a heat exchanger body which comprises a columnar tank body and end covers arranged at the two ends of the tank body. The flow equalizing part is arranged at one end of the columnar tank body and can uniformly diffuse the high-temperature fluid into the columnar tank body; the pipeline bundle is arranged in the columnar tank body; the heat storage pieces exchange heat with high-temperature fluid, can store heat of the high-temperature fluid and transmit the stored heat to the branch pipes, so that the temperature storage time of the branch pipes can be prolonged, the heat exchange effect of low-temperature fluid in the branch pipes is improved, the thickness of the heat storage pieces is gradually increased in the flowing direction of the high-temperature fluid in the columnar tank body, and the heat storage efficiency is improved. Heat exchange consumption of the high-temperature fluid at the inlet end of the tank body and the heat storage pieces is reduced, the closer to the outlet of the tank body, the heat exchange capacity of the heat storage pieces and the high-temperature fluid is enhanced, and therefore the temperature difference of the high-temperature fluid in the columnar tank body can be greatly reduced, and the problem that an existing heat exchange device is low in heat exchange efficiency is solved.

Description

Technical Field

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

[0002] A heat exchanger is a device that transfers heat from a high-temperature fluid to a low-temperature fluid, thereby raising the temperature of the low-temperature fluid. Most existing heat exchangers have a pipe for the low-temperature fluid to flow in a tank, and a high-temperature fluid flows outside the pipe. The high-temperature fluid surrounds the pipe and is used to heat the low-temperature fluid in the pipe to achieve heat exchange.

[0003] However, the existing heat exchange device has low heat exchange efficiency, mainly due to the following reasons:

[0004] 1. The pipeline for low-temperature fluid flow extends from the tank inlet to the tank outlet in the tank body. The temperature of the high-temperature fluid gradually decreases during the process of flowing from the tank inlet to the tank outlet. This makes the temperature difference between the high-temperature fluid at the tank inlet and the tank outlet large. The closer the low-temperature fluid is to the tank outlet, the worse the heating effect is, resulting in low heat exchange efficiency.

[0005] 2. It is impossible to ensure that the high-temperature fluid is evenly distributed when it enters the tank body, which makes the high-temperature fluid in the tank body contact with each pipe for an uneven time, resulting in different heat exchange effects on each pipe, thereby affecting the heating effect of the low-temperature fluid discharged from the tank body after heat exchange, resulting in low heat exchange efficiency. Summary of the invention

[0006] In view of the above problems existing in the existing shell and tube heat exchanger, the present invention is proposed.

[0007] Therefore, an object of the present invention is to provide a shell and tube heat exchanger.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising:

[0009] The heat exchanger body comprises a columnar tank body and end covers arranged at both ends of the tank body;

[0010] A flow equalizing portion, which is disposed at one end of the columnar tank body and can evenly diffuse the high-temperature fluid into the columnar tank body;

[0011] A pipe bundle is arranged inside the cylindrical tank body;

[0012] The heat storage sheet is arranged on the pipe bundle.

[0013] As a preferred embodiment of the shell-and-tube heat exchanger of the present invention, the pipe bundle includes a converging inlet pipe provided at one end of the columnar tank body, a converging outlet pipe provided at the other end of the columnar tank body, and a plurality of branch pipes provided between the converging inlet pipe and the converging outlet pipe;

[0014] The outer sides of the plurality of groups of branch pipes are all provided with heat storage sheets, and the heat storage sheets extend along the axial direction of the branch pipes;

[0015] Wherein, the converging inlet pipe and the converging outlet pipe both penetrate the side wall of the columnar tank body.

[0016] As a preferred solution of the shell-and-tube heat exchanger of the present invention, the thickness of the heat storage plate gradually increases along the flow direction of the high-temperature fluid in the heat exchanger body.

[0017] As a preferred solution of the shell-and-tube heat exchanger of the present invention, the heat storage plate is in the shape of a right-angled triangle flat plate, and a right-angled side of the heat storage plate is connected to the branch pipe;

[0018] A plurality of groups of heat storage sheets are evenly distributed on the outer wall of a group of branch pipes.

[0019] As a preferred solution of the shell-and-tube heat exchanger of the present invention, the heat storage plate is spirally shaped and wound around the outer wall of the branch pipe.

[0020] The spiral pitch of the heat storage plate gradually decreases from the branch pipe inlet to the outlet.

[0021] As a preferred embodiment of the shell-and-tube heat exchanger of the present invention, a high-temperature fluid inlet portion is further provided at the inlet of the tank body, which includes a high-temperature fluid main inlet pipe provided at the inlet of the tank body, and a plurality of spiral liquid inlet branch pipes provided at the end of the high-temperature fluid main inlet pipe;

[0022] Wherein, the spiral liquid inlet branch pipe is located in the end cover.

[0023] As a preferred solution of the shell-and-tube heat exchanger of the present invention, the end of the spiral liquid inlet branch pipe is connected to the flow equalizing part.

[0024] As a preferred solution of the shell-and-tube heat exchanger of the present invention, a fluid filter is connected to the end of the high-temperature fluid main inlet pipe.

[0025] As a preferred solution of the shell-and-tube heat exchanger of the present invention, the heat exchanger body is a horizontal tank body in which water is placed.

[0026] The beneficial effects of the present invention are as follows: through the arrangement of the flow equalizing part, the high-temperature fluid introduced at the tank inlet can be evenly diffused into the tank body through the guide hole, thereby ensuring that the high-temperature fluid entering the columnar tank body is evenly distributed, avoiding low heat exchange efficiency due to uneven distribution of the high-temperature fluid when entering, the heat storage plate contacts with the high-temperature fluid and exchanges heat with the high-temperature fluid, can store the heat of the high-temperature fluid, and transfer the stored heat to the branch pipe, thereby extending the temperature storage time of the branch pipe, and further improving the heat exchange effect of the low-temperature fluid in the branch pipe, the thickness of the heat storage plate gradually increases along the flow direction of the high-temperature fluid in the columnar tank body, thereby reducing the contact area between the high-temperature fluid and the heat storage plate near the tank inlet end; at the same time, this arrangement reduces the heat exchange consumption between the high-temperature fluid at the tank inlet end and the heat storage plate, and the closer to the tank outlet, the stronger the heat exchange capacity of the heat storage plate and the high-temperature fluid, thereby greatly reducing the temperature difference between the high-temperature fluid at the tank inlet and the tank outlet in the columnar tank body, solving the problem of low heat exchange efficiency existing in the existing heat exchange device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0028] Figure 1 It is a schematic diagram of the overall structure of the shell and tube heat exchanger of the present invention.

[0029] Figure 2 This is a schematic diagram of the installation of the pipeline bundle in the present invention.

[0030] Figure 3 For the present invention Figure 1 Cross-section view of AA.

[0031] Figure 4 For the present invention Figure 1 Cross-section of the BB.

[0032] Figure 5 For the present invention Figure 2 Cross-section of CC.

[0033] Figure 6 It is a schematic diagram of the structure of the flat plate heat storage sheet in the present invention.

[0034] Figure 7 It is a schematic diagram of the structure of the spiral heat storage sheet in the present invention. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0038] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0039] Example 1

[0040] Reference Figure 1-Figure 6 , provides a shell and tube heat exchanger, a shell and tube heat exchanger, comprising,

[0041] The heat exchanger body 100 includes a columnar tank body 101 and end covers 102 disposed at both ends of the tank body;

[0042] The flow equalizing portion 300 is disposed at one end of the cylindrical tank body 101 and can evenly diffuse the high-temperature fluid into the cylindrical tank body 101;

[0043] The pipe bundle 200 is arranged inside the cylindrical tank body 101;

[0044] The heat storage sheet 400 is arranged on the pipe bundle 200;

[0045] The cylindrical tank body 101 is provided with openings at both ends thereof so as to be connected with the end covers 102 at both ends. A tank body inlet 103 is provided on one set of the end covers 102, and a tank body outlet 104 is provided on the other set of the end covers 102. The tank body inlet 103 is used to introduce the high-temperature fluid into the tank body, and the tank body outlet 104 is used to lead the high-temperature fluid after heat exchange out of the tank body.

[0046] The flow equalizing plate includes a fixed plate 301 fixed at one end of the columnar tank body 101, and a plurality of groups of guide holes 302 are evenly arranged on the fixed plate 301. The flow equalizing plate is used to evenly diffuse the high-temperature fluid introduced into the tank body inlet 103 into the tank body through the guide holes 302 to ensure that the high-temperature fluid entering the columnar tank body 101 is evenly distributed, thereby avoiding low heat exchange efficiency due to uneven distribution of the high-temperature fluid when entering.

[0047] Furthermore, the pipe bundle 200 includes a converging inlet pipe 201 disposed at one end of the columnar tank body 101, a converging outlet pipe 202 disposed at the other end of the columnar tank body 101, and a plurality of branch pipes 203 disposed between the converging inlet pipe 201 and the converging outlet pipe 202;

[0048] The outer sides of the multiple groups of branch pipes 203 are all provided with heat storage sheets 400, and the heat storage sheets 400 extend along the axial direction of the branch pipes 203;

[0049] The converging inlet pipe 201 and the converging outlet pipe 202 both penetrate the side wall of the cylindrical tank body 101;

[0050] The converging inlet pipe 201 is arranged near one end of the tank inlet 103, and the converging outlet pipe 202 is arranged near one end of the tank outlet 104. The multiple groups of branch pipes 203 are parallel to the axial direction of the cylindrical tank body 101, and the multiple groups of branch pipes 203 are evenly distributed around the axis of the cylindrical tank body 101. The inlets of the multiple groups of branch pipes 203 are connected to the converging inlet pipe 201, and the outlets of the multiple groups of branch pipes 203 are connected to the converging outlet pipe 202.

[0051] The branch pipe 203 and the heat storage sheet 400 thereon are preferably integrally formed, and the heat storage sheet 400 extends from the inlet of the branch pipe 203 to its outlet. The heat storage sheet 400 is preferably a thin sheet structure with a heat conductive function. As the high-temperature fluid flows, the heat storage sheet 400 of the branch pipe 203 is immersed in the high-temperature fluid, and the heat storage sheet 400 also contacts the high-temperature fluid and exchanges heat with the high-temperature fluid, and stores the heat of the high-temperature fluid. Since the heat storage sheet 400 is arranged on the surface of the branch pipe 203, it transfers the stored heat to the branch pipe 203, thereby extending the temperature storage time of the branch pipe 203, thereby improving the heat exchange effect of the low-temperature fluid in the branch pipe 203. Considering that the temperature of the high-temperature fluid near the tank inlet 103 end is higher, in order to avoid a large amount of temperature consumption as soon as the high-temperature fluid enters.

[0052] Furthermore, the thickness of the heat storage sheet 400 gradually increases along the flow direction of the high-temperature fluid in the heat exchanger body 100;

[0053] The greater the thickness of the heat storage sheet 400, the greater its unfolded area, and then the greater the contact area with the high-temperature fluid, the better the heat exchange effect between the heat storage sheet 400 and the high-temperature fluid. As the high-temperature fluid flows in the cylindrical tank body 101, although the high-temperature fluid shows an overall temperature reduction trend from the tank body inlet 103 to the tank body outlet 104, due to the change in the thickness of the heat storage sheet 400, the heat exchange consumption of the high-temperature fluid and the heat storage sheet 400 is reduced at the tank body inlet 103 end, and the closer to the tank body outlet 104, the heat exchange capacity of the heat storage sheet 400 and the high-temperature fluid is enhanced, so that the temperature difference between the high-temperature fluid at the tank body inlet 103 and the tank body outlet 104 in the cylindrical tank body 101 can be greatly reduced, solving the problem of low heat exchange efficiency existing in the existing heat exchange device.

[0054] Furthermore, the heat exchanger body 100 is a horizontal tank body placed in the water body;

[0055] The tank body is a horizontal tank body placed horizontally, that is, the cylindrical tank body 101 is generally placed horizontally; the cylindrical tank body 101 is a cylindrical tank body 101, the fixing plate 301 is a circular plate with an outer diameter the same as the inner diameter of the cylindrical tank body 101, and the outer periphery of the fixing plate 301 and the inner wall of the cylindrical tank body 101 are sealed by a sealing ring. The tank body inlet 103 and the aforementioned tank body outlet 104 are both coaxially arranged with the cylindrical tank body 101;

[0056] The inner wall of the tank body is provided with an insulation layer, which can prevent the heat from volatilizing and being lost through the side wall of the columnar tank body 101 during the flow of the high-temperature fluid in the columnar tank body 101, which is helpful to assist in improving the thermal energy utilization rate of the high-temperature fluid and thus ensure the heat exchange efficiency of the entire heat exchange device.

[0057] Example 2

[0058] Reference Figure 1-Figure 6 , this embodiment is different from the first embodiment in that: the heat storage sheet 400 is in the shape of a right-angled triangular flat plate, and a right-angled side of the heat storage sheet 400 is connected to the branch pipe 203;

[0059] A plurality of groups of heat storage sheets 400 are evenly distributed on the outer wall of a group of branch pipes 203;

[0060] like Figure 5 and Figure 6 As shown, the heat storage sheet 400 is a right-angled triangle flat plate heat storage sheet 400, and a right angle side of the right-angled triangle flat plate heat storage sheet 400 is connected to the branch pipe 203; Figure 5 As shown, a plurality of right-angled triangular flat plate heat storage sheets 400 are evenly arranged on the outer wall of any branch pipe 203. By disposing a plurality of groups of heat storage sheets 400, the heat exchange efficiency of the heat storage sheets 400 is improved.

[0061] The rest of the structure is the same as that of Example 1.

[0062] Example 3

[0063] Reference Figure 1-Figure 7 , this embodiment is different from the above embodiments in that: the heat storage sheet 400 is spirally shaped and is wound around the outer wall of the branch pipe 203;

[0064] The spiral pitch of the heat storage sheet 400 gradually decreases from the inlet to the outlet of the branch pipe 203;

[0065] The pitch of the spiral heat storage sheet 400 gradually decreases from the inlet to the outlet of the branch pipe 203, that is, the closer the spiral heat storage sheet 400 is to the tank outlet 104, the denser the distribution (e.g. Figure 7 As shown), based on this structural setting, although the high-temperature fluid shows an overall trend of decreasing temperature from the tank inlet 103 to the tank outlet 104, the heat storage sheet 400 at the tank inlet 103 end has a small thickness, a sparse distribution, and a large pitch, which reduces the heat exchange consumption between the high-temperature fluid and the heat storage sheet 400. The closer to the tank outlet 104, the thicker the heat storage sheet 400 is, the denser the distribution, and the smaller the pitch, which enhances the heat exchange capacity between the heat storage sheet 400 and the high-temperature fluid. As a result, the temperature difference between the high-temperature fluid at the tank inlet 103 and the tank outlet 104 in the columnar tank body 101 can be greatly reduced, thereby solving the problem of low heat exchange efficiency in the existing heat exchange device.

[0066] The rest of the structure is the same as that of Example 2.

[0067] Example 4

[0068] Reference Figure 1-Figure 7 , this embodiment is different from the above embodiment in that: a high-temperature fluid introduction portion 500 is further provided at the tank inlet 103, which includes a high-temperature fluid main inlet pipe 501 provided at the tank inlet 103, and a plurality of spiral liquid inlet branch pipes 502 provided at the end of the high-temperature fluid main inlet pipe 501;

[0069] Wherein, the spiral liquid inlet branch pipe 502 is located in the end cover 102;

[0070] The high-temperature fluid main inlet pipe 501 passes through the tank inlet 103 and is coaxial with the cylindrical tank body 101, and the outlet end of the high-temperature fluid main inlet pipe 501 extends into the inner side of the end cover 102, and the inlet end of the high-temperature fluid main inlet pipe 501 extends to the outer side of the end cover 102; the spiral liquid inlet branch pipe 502 is arranged on the inner side of the end cover 102 and is located between the end cover 102 and the flow equalizing plate, and the outlet end of the high-temperature fluid main inlet pipe 501 is connected to a plurality of spiral liquid inlet branch pipes 502, and the plurality of spiral liquid inlet branch pipes 502 are evenly distributed in a circle with the axis of the high-temperature fluid main inlet pipe 501 as the center;

[0071] The high-temperature fluid main inlet pipe 501 is used to connect the high-temperature fluid to the outside to introduce the high-temperature fluid. The multiple sets of spiral liquid inlet branch pipes 502 connected to the end of the high-temperature fluid main inlet pipe 501 can realize the initial diversion of the high-temperature fluid. The spiral liquid inlet branch pipes 502 are distributed in a spiral shape, which can extend the flow time of the high-temperature fluid in the spiral liquid inlet branch pipes 502, play a role in pressure buffering when the high-temperature fluid just enters, and ensure that the high-temperature fluid is evenly diverted to each spiral liquid inlet branch pipe 502.

[0072] Furthermore, the end of the spiral liquid inlet branch pipe 502 is connected to the flow equalizing part 300;

[0073] The spiral liquid inlet branch pipe 502 is connected to the guide holes 302 on the flow equalizing plate in a one-to-one correspondence. After the spiral liquid inlet branch pipe 502 initially diverts the high-temperature fluid, combined with the setting of the flow equalizing plate, the high-temperature fluid can be evenly distributed when it enters the columnar tank body 101. The spiral shape of the spiral liquid inlet branch pipe 502 enables the high-temperature fluid inside to reach the flow equalizing plate at the same speed and pressure at the same time, further improving the distribution uniformity of the high-temperature fluid when it enters the columnar tank body 101, which is beneficial to improving the heat exchange efficiency and heat exchange effect of the high-temperature fluid.

[0074] Furthermore, a fluid filter 600 is connected to the end of the high-temperature fluid main inlet pipe 501;

[0075] A fluid filter 600 is provided on the portion of the high-temperature fluid main inlet pipe 501 located outside the end cover 102. The fluid filter 600 is used to filter out impurities from the high-temperature fluid entering the high-temperature fluid main inlet pipe 501 to ensure that the high-temperature fluid entering the cylindrical tank body 101 is clean and reliable, and to prevent the high-temperature fluid from scaling or remaining on the inner wall of the cylindrical tank body 101, the outer wall of the branch pipe 203 or the outer wall of the heat storage plate 400, thereby affecting the heat exchange process between the branch pipe 203, the heat storage plate 400 and the high-temperature fluid, and further affecting the heat exchange efficiency between the high-temperature fluid and the low-temperature fluid in the branch pipe 203.

[0076] The rest of the structure is the same as that of Example 3.

[0077] Example 5

[0078] In this embodiment, the thermal storage sheets 400 of different thicknesses in the present invention are verified by setting the following simulation environment:

[0079] Material properties: The thermal storage sheet 400 is made of the same material and has a constant thermal conductivity (k);

[0080] Experimental environment: Keep the ambient temperature, fluid temperature and flow rate constant;

[0081] Test method: prepare multiple sets of heat storage sheets 400 with thicknesses between 2 cm and 0.5 cm, and calculate the thermal conductivity at these different thicknesses;

[0082] Initial thermal conductivity of the material: k 0 =50W / m·K;

[0083] The relationship between thermal conductivity and thickness is assumed to be k = k 0 ·(1-0.05·(0.02-d)), where d is the thickness of the thermal storage sheet (400) (meter);

[0084] Simulation experimental data:

[0085]

[0086] It can be seen from the simulation data that as the thickness of the thermal storage sheet 400 decreases, the thermal conductivity increases, which may be because the thinner thermal storage sheet 400 provides less thermal resistance, thereby improving the heat transfer efficiency.

[0087] The optimal thickness of the heat storage sheet 400 should provide sufficient heat conduction efficiency while also considering mechanical strength and cost effectiveness;

[0088] Optimal thickness selection: According to the above simulation data, when the thickness of the heat storage sheet 400 is 0.02 m (2 cm), the thermal conductivity is the lowest, which is 47.5 W / m·K. This may be because at this thickness, the thermal resistance of the heat storage sheet 400 is the smallest, thereby providing the best thermal conduction performance;

[0089] However, other factors need to be considered when selecting the optimal thickness, such as the mechanical strength of the material, cost, processing difficulty, etc. In this simulation experiment, the optimal thickness of the heat storage plate 400 is 2 cm (0.02 m), at which the thermal conductivity is the lowest, providing the best heat conduction efficiency.

[0090] The rest of the structures are the same as those in Example 4.

[0091] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0092] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0093] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0094] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A shell and tube heat exchanger, characterized in that: include, A heat exchanger body (100) comprises a columnar tank body (101) and end covers (102) arranged at both ends of the tank body; A flow balancing portion (300) is disposed at one end of the columnar tank body (101) and is capable of evenly diffusing the high-temperature fluid into the columnar tank body (101); A pipe bundle (200) is arranged inside the cylindrical tank body (101); A heat storage sheet (400) is arranged on the pipe bundle (200).

2. The shell and tube heat exchanger according to claim 1, characterized in that: The pipe bundle (200) comprises a converging inlet pipe (201) arranged at one end of the columnar tank body (101), a converging outlet pipe (202) arranged at the other end of the columnar tank body (101), and a plurality of branch pipes (203) arranged between the converging inlet pipe (201) and the converging outlet pipe (202); A heat storage sheet (400) is disposed on the outer side of each of the plurality of groups of branch pipes (203), and the heat storage sheet (400) extends along the axial direction of the branch pipe (203); Wherein, the converging inlet pipe (201) and the converging outlet pipe (202) both penetrate the side wall of the columnar tank body (101).

3. The shell and tube heat exchanger according to claim 2, characterized in that: The thickness of the heat storage sheet (400) gradually increases along the flow direction of the high-temperature fluid in the heat exchanger body (100).

4. The shell and tube heat exchanger according to claim 3, characterized in that: The heat storage plate (400) is in the shape of a right-angled triangular flat plate, and a right-angled side of the heat storage plate (400) is connected to the branch pipe (203); A plurality of groups of heat storage sheets (400) are evenly distributed on the outer wall of a group of branch pipes (203).

5. The shell and tube heat exchanger according to claim 3, characterized in that: The heat storage sheet (400) is spiral-shaped and is wound around the outer wall of the branch pipe (203).

6. The shell and tube heat exchanger according to claim 5, characterized in that: The spiral pitch of the heat storage plate (400) gradually decreases from the inlet to the outlet of the branch pipe (203).

7. The shell and tube heat exchanger according to claim 4 or 5, characterized in that: A high-temperature fluid inlet portion (500) is also provided at the tank inlet (103), comprising a high-temperature fluid main inlet pipe (501) provided at the tank inlet (103), and a plurality of spiral liquid inlet branch pipes (502) provided at the end of the high-temperature fluid main inlet pipe (501); Wherein, the spiral liquid inlet branch pipe (502) is located in the end cover (102).

8. The shell and tube heat exchanger according to claim 7, characterized in that: The end of the spiral liquid inlet branch pipe (502) is in communication with the flow equalizing part (300).

9. The shell and tube heat exchanger according to claim 8, characterized in that: The end of the high-temperature fluid main inlet pipe (501) is connected to a fluid filter (600).

10. The shell and tube heat exchanger according to claim 3 or 8, characterized in that: The heat exchanger body (100) is a horizontal tank body placed in a water body.

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