Efficient integrated shell and tube heat exchanger

Abstract

The utility model discloses an efficient integrated shell-and-tube heat exchanger which comprises a vertically-arranged barrel and a heat exchange tube, one end of the barrel comprises a tube pass inlet and a shell pass outlet, and the other end of the barrel comprises a tube pass outlet and a shell pass inlet. The heat exchange tube is connected in the cylinder body, the heat exchange tube comprises a straight tube part and a winding tube part which are sequentially connected in series, the straight tube part is positioned at the upper part, and the winding tube part is positioned at the lower part of the straight tube part. The heat exchanger has the beneficial effects that the thermal stress of pipes in the heat exchanger can be released, so that the heat exchanger is protected; the equipment size is reduced, the heat exchange efficiency is improved, and the adaptability is high.

Description

Technical Field

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

[0002] Heat exchanger is a device that transfers part of the heat of hot fluid to cold fluid. It is also called heat exchanger. Heat exchanger plays an important role in chemical, petroleum, power, food and many other industrial production. In chemical production, heat exchanger can be used as heater, cooler, condenser, evaporator and reboiler, etc., and is widely used.

[0003] Since the two sides of the tube bundle of the traditional shell and tube heat exchanger are fixed, when the temperature difference at both ends of the heat exchanger or the tube heat pipe temperature reaches a certain level, the internal stress of the tube bundle inside the heat exchange tube increases greatly. If it exceeds this value, the structure of the heat exchanger will be damaged, causing the heat exchanger to fail.

[0004] In addition, the interior of a traditional shell and tube heat exchanger is basically a single straight tube or a single U-shaped tube. When the heat exchange area of ​​the heat exchanger needs to be increased, the only way is to increase the number of tube bundles, but this method will proportionally increase the overall size of the heat exchanger, resulting in space limitations for the heat exchanger in actual application sites. In addition, the internal tube bundle of a shell and tube heat exchanger is basically a single material or type, and the heat exchange performance and working medium tolerance of heat exchange tubes of various materials are different, and the performance of various tubes is not fully utilized.

[0005] Furthermore, if the utilization rate of the heat exchange area is considered in the traditional shell and tube heat exchanger, the contact length between the heat exchange fluid and the tube side or the turbulence of the fluid will be simply increased to maximize the area utilization rate. However, excessive contact length will affect the gas-liquid separation efficiency of the phase change fluid, causing a large amount of liquid to be carried out at the shell side medium outlet. At this time, some external separation equipment is required for separation and recycling; on the contrary, increasing the gas-liquid separation efficiency will reduce the utilization rate of the heat exchange area of ​​the tube bundle. Various types of baffles will also be used to simply increase the turbulence of the shell side fluid. The utilization rate that can be improved by this type is limited by the shell side pressure drop, so the turbulence of the shell side fluid cannot be further increased.

[0006] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the utility model, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to ordinary technicians in this field. Utility Model Content

[0007] The technical problem to be solved by the utility model is: how to solve the problem of large thermal stress of the tube bundle of the current shell and tube heat exchanger.

[0008] The utility model solves the above technical problems through the following technical means:

[0009] A high-efficiency integrated shell and tube heat exchanger comprises a vertically arranged cylinder and a heat exchange tube, wherein one end of the cylinder comprises a tube-side inlet and a shell-side outlet, and the other end of the cylinder comprises a tube-side outlet and a shell-side inlet, and the heat exchange tube is connected to the cylinder, and the heat exchange tube comprises a straight tube portion and a winding tube portion connected in series in sequence, wherein the straight tube portion is located at the upper portion, and the winding tube portion is located at the lower portion of the straight tube portion.

[0010] The utility model adopts a vertically arranged cylinder, and the heat exchanger inside the cylinder adopts two structures, the upper part adopts a straight tube part, and the lower part adopts a winding tube part; when the temperature of the shell and tube heat exchanger is high or the temperature difference between the upper and lower parts is large and the thermal stress of the tube is large, the straight tube part has a small temperature difference, the stress in the tube is correspondingly reduced, and the expansion rate of the tube bundle is also correspondingly reduced; the lower side adopts a winding tube part, because it is at the lower part, the temperature difference is relatively reduced, but the winding tube part structure can make the tube bundle have a certain flexibility, so that the number of tubes can be normally deformed in the upper and lower directions due to thermal stress, and the heat exchanger will not be damaged; because the two heat exchange structures on the upper and lower sides are connected in series, even if the thermal stress on the upper side is large, the thermal stress will be transmitted to the lower side, so that the lower part can release the thermal stress of the number of tubes inside the heat exchanger through deformation, thereby protecting the heat exchanger.

[0011] Furthermore, the lower side of the heat exchanger adopts a wound tube portion, and the tube-side fluid and the shell-side liquid fully exchange heat, further increasing the subcooling of the tube-side medium, thereby improving the thermal utilization rate and the heat exchange capacity of peripheral equipment; and in the same cylinder, under the condition of the same length of the heat exchange tube, compared with the straight tube structure, the length of the heat exchanger will be greatly reduced, the tube-side fluid and the shell-side liquid fully exchange heat, further increasing the subcooling of the tube-side medium, thereby improving the thermal utilization rate and the heat exchange capacity of peripheral equipment and reducing the size of the equipment. The space limitation of the heat exchanger in the actual application site will also be greatly reduced, and the application field will be expanded as a result.

[0012] Preferably, it further comprises a confluence distributor, which is connected between the straight pipe part and the winding pipe part to achieve communication between the two.

[0013] The utility model arranges a flow distributor between the straight pipe portion and the winding pipe portion. On the one hand, the working fluid flowing through the straight pipe portion can be homogenized before entering the winding pipe portion, thereby improving the uniformity of heat exchange. On the other hand, the upper straight pipe portion and the lower winding pipe portion are not directly connected, and the material or type of the upper straight pipe portion and the lower winding pipe can be adjusted by utilizing the working medium factor, thereby further improving the unit volume utilization rate of the heat exchanger.

[0014] Preferably, the confluence distributor includes a connecting tube and a flow equalizing plate, one end of the connecting tube is connected to and communicated with the straight tube portion, and the other end is connected to and communicated with the winding tube portion, the flow equalizing plate is connected in the connecting tube, the flow equalizing plate is roughly perpendicular to the flow direction of the fluid, and the flow equalizing plate includes a plurality of flow equalizing holes.

[0015] Preferably, the flow balancing plate is substantially perpendicular to the flow direction of the fluid, and the flow balancing plate includes a plurality of flow balancing holes.

[0016] Preferably, the connecting cylinder is in a Y-shaped structure, and a gas-liquid separation chamber is formed between the outside of the Y-shaped structure and the cylinder body.

[0017] Preferably, the straight pipe portion includes a plurality of straight pipes, a first fixed plate, a second fixed plate, and a baffle. The first fixed plate is connected to the cylinder, the second fixed plate is connected to the end of the confluence distributor, and the two ends of the straight pipe are respectively connected to the first fixed plate and the second fixed plate. The plurality of straight pipes are arranged in parallel and evenly, and the baffle is passed through the straight pipe and connected thereto.

[0018] Preferably, the winding tube portion includes a plurality of winding tubes, the plurality of winding tubes are in a multi-layer sleeved form, and the spiral directions of the winding tubes in adjacent layers are opposite.

[0019] Preferably, the cylinder body includes a straight section, a first flange, and a second flange, both ends of the straight section are respectively connected to the first flange and the second flange, the first flange includes a tube-side inlet, the second flange includes a tube-side outlet, the top of the side wall of the straight section includes a shell-side outlet, and the bottom of the side wall of the straight section includes a shell-side inlet.

[0020] Preferably, the pipe-side inlet is communicated with the straight pipe portion, and the pipe-side outlet is connected with the winding pipe portion.

[0021] Preferably, it further comprises a liquid level communicating vessel, wherein the liquid level communicating vessel is in communication with the side wall of the cylinder.

[0022] Preferably, the top of the liquid level communicating vessel is substantially flush with the connection between the straight tube portion and the winding tube portion.

[0023] A larger cavity is formed between the connecting tube and the cylinder of the Y-shaped structure, which can realize gas-liquid separation. Specifically, the tube-side and shell-side fluids of the wound tube part fully exchange heat, forming a medium with a higher dryness (or liquid carryover rate) passing through the middle cavity part for primary gas-liquid separation, and then the structure of the upper straight tube part further increases the sufficient heat exchange between the medium and the tube-side hot fluid, so that the outlet is basically free of liquid; the outlet dryness can be controlled by adjusting the liquid level communication vessel outside the shell side. When the liquid level is high, the liquid carryover rate is high, otherwise it can be free of liquid or present an overheated state, which is specifically adjusted according to the actual process requirements.

[0024] The advantages of the utility model are:

[0025] (1) The utility model adopts a vertically arranged cylinder, and the heat exchanger inside the cylinder adopts two structures, the upper part adopts a straight tube part, and the lower part adopts a winding tube part; when the temperature of the shell and tube heat exchanger is high or the temperature difference between the upper and lower parts is large and the thermal stress of the tube is large, the straight tube part has a smaller temperature difference, and the stress inside the tube is correspondingly reduced, and the expansion rate of the tube bundle is also correspondingly reduced; the lower part adopts a winding tube part, and since it is at the lower part, the temperature difference is relatively reduced, but the winding tube part structure can make the tube bundle have a certain flexibility, so that the number of tubes can be deformed normally in the upper and lower directions due to thermal stress, and the heat exchanger will not be damaged; because the two heat exchange structures on the upper and lower sides are connected in series, even if the thermal stress on the upper side is large, the thermal stress will be transmitted to the lower side, so that the lower part can release the thermal stress of the number of tubes inside the heat exchanger through deformation, thereby protecting the heat exchanger.

[0026] Furthermore, the lower side of the heat exchanger adopts a winding tube part, and the tube-side fluid and the shell-side liquid fully exchange heat, further increasing the subcooling of the tube-side medium, thereby improving the heat utilization rate and the heat exchange capacity of peripheral equipment; and in the same cylinder, under the condition of the same heat exchange tube length, compared with the straight tube structure, the length of the heat exchanger will be greatly reduced, the tube-side fluid and the shell-side liquid fully exchange heat, further increasing the subcooling of the tube-side medium, thereby improving the heat utilization rate and the heat exchange capacity of peripheral equipment, thereby reducing the size of the equipment, and the space limitation of the heat exchanger in the actual application site will be greatly reduced, and the application field will be expanded accordingly;

[0027] (2) The utility model provides a flow distributor between the straight pipe part and the winding pipe part. On the one hand, the working medium flowing through the straight pipe part can be homogenized before entering the winding pipe part, thereby improving the uniformity of heat exchange. On the other hand, the upper straight pipe part and the lower winding pipe part are not directly connected, and the material or type of the upper straight pipe part and the lower winding pipe can be adjusted by utilizing the working medium factor, thereby further improving the unit volume utilization rate of the heat exchanger.

[0028] (3) A larger cavity is formed between the Y-shaped connecting tube and the cylinder body, which can achieve gas-liquid separation. Specifically, the tube-side and shell-side fluids of the wound tube part fully exchange heat, forming a medium with a higher dryness (or liquid carryover rate) passing through the middle cavity part for primary gas-liquid separation, and then the structure of the upper straight tube part further increases the sufficient heat exchange between the medium and the tube-side hot fluid, so that the outlet is basically free of liquid; the outlet dryness can be controlled by adjusting the liquid level connector on the outside of the shell side. When the liquid level is high, the liquid carryover rate is high, otherwise it can be free of liquid or present an overheated state, which is adjusted according to the actual process requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1It is a structural schematic diagram of a high-efficiency integrated shell and tube heat exchanger according to an embodiment of the utility model;

[0030] Figure 2 It is a structural schematic diagram of a high-efficiency integrated shell and tube heat exchanger according to an embodiment of the utility model;

[0031] Figure 3 This is an enlarged schematic diagram of a flow distributor according to an embodiment of the utility model;

[0032] Numbers in the figure:

[0033] 1. Cylinder; 11. Tube side inlet; 12. Tube side outlet; 13. Shell side inlet; 14. Shell side outlet; 15. Straight section; 16. First flange; 17. Second flange;

[0034] 2. heat exchange tube; 21. straight tube portion; 211. straight tube; 212. first fixed plate; 213. second fixed plate; 214. baffle; 22. winding tube portion; 221. winding tube;

[0035] 3. Flow distributor; 31. Connecting tube; 32. Flow equalizing plate;

[0036] 4. Liquid level communicating vessel. DETAILED DESCRIPTION

[0037] 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 will be clearly and completely described below in combination with the embodiments of the utility model. 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 are within the scope of protection of the utility model.

[0038] Embodiment 1:

[0039] like Figure 1 , Figure 2 As shown, the high-efficiency integrated shell and tube heat exchanger includes a vertically arranged cylinder 1, a heat exchange tube 2, and a confluence distributor 3. The top of the cylinder 1 includes a tube-side inlet 11 and a shell-side outlet 14, and the bottom of the cylinder 1 includes a tube-side outlet 12 and a shell-side inlet 13. The heat exchange tube 2 is connected to the cylinder 1. The heat exchange tube 2 includes a straight tube portion 21 and a winding tube portion 22 connected in series in sequence. The straight tube portion 21 is located at the upper part, and the winding tube portion 22 is located at the lower part of the straight tube portion 21. The confluence distributor 3 is connected between the straight tube portion 21 and the winding tube portion 22 to achieve communication between the two.

[0040] Specifically, the cylinder 1 includes a straight section 15, a first flange 16, and a second flange 17. The top and bottom ends of the straight section 15 are connected to the first flange 16 and the second flange 17 respectively. The straight section 15 is a cylindrical structure, with two axial ends open and provided with annular folded edges connected to the first flange 16 and the second flange 17. The first flange 16 and the second flange 17 are connected to the annular side of the straight section 15 by a plurality of bolts to achieve internal sealing of the cylinder 1. The first flange 16 includes a pipe-side inlet 11. Specifically, the middle portion of the first flange 16 protrudes outward and forms a first cylindrical structure at the center. The end of the first cylindrical structure is the pipe-side inlet 11. In this embodiment, the pipe-side inlet 11 is connected to the straight pipe portion 21. The second flange 17 includes a pipe-side outlet 12. Specifically, as Figure 2 As shown, a hole is opened in the center of the second flange 17, and the bottom of the winding tube portion 22 is connected to a second cylindrical structure, and the bottom end of the second cylindrical structure forms a tube side outlet 12. Among them, the top of the side wall of the straight tube section 15 includes a shell side outlet 14, and the bottom of the side wall of the straight tube section 15 includes a shell side inlet 13, and the shell side inlet 13 and the shell side outlet 14 are both cylindrical structures. When the heat exchanger of this embodiment is used, one working medium flows from the tube side inlet 11 into the cavity between the first flange 16 and the straight tube portion 21, the straight tube portion 21, the confluence distributor 3, the winding tube portion 22, the second cylindrical structure at the bottom of the winding tube portion 22, and finally flows out from the tube side outlet 12, and another working medium can flow in from the shell side inlet 13, pass through the space between the winding tube portion 22 and the straight tube section 15, the space between the straight tube portion 21 and the straight tube section 15, and finally flow out from the shell side outlet 14. The two working mediums realize heat exchange, thereby achieving the heat exchange demand.

[0041] It should be noted that the purpose of this embodiment is to achieve the heat exchange effect of evaporation in the shell side and condensation in the tube side. However, if it is necessary to achieve the heat exchange effect of condensation in the shell side and evaporation in the tube side, the working fluid in the tube side needs to flow in from the bottom and out from the top, while the working fluid in the shell side needs to flow in from the top and out from the bottom.

[0042] like Figure 1 , Figure 2As shown, the straight tube section 21 includes a plurality of straight tubes 211, a first fixing plate 212, a second fixing plate 213, and a baffle 214. The first fixing plate 212 is connected to the cylinder 1, and the second fixing plate 213 is connected to the end of the converging distributor 3. Specifically, the first fixing plate 212 is a circular plate with a plurality of connecting holes. The straight tubes 211 can be inserted into the connecting holes and then welded to separate the liquid in the tube side from the liquid in the shell side. The first fixing plate 212 is connected to the straight tube section 15 of the cylinder 1 and is located above the shell side outlet 14. The second fixing plate 213 is also a circular plate with a plurality of connecting holes. The bottom of the straight tube 211 is welded to the connecting holes. The plurality of straight tubes 211 are arranged in parallel and evenly. The baffle 214 passes through the straight tube 211 and is connected thereto. Specifically, the baffle 214 is a spiral plate extending along the axial direction of the straight tube 211. The function of the baffle 214 is to bend the flow of the liquid in the shell side to achieve sufficient heat exchange between the two working fluids. The baffle 214 can adopt the existing technology.

[0043] like Figure 1 , Figure 2 As shown, the winding tube portion 22 includes a plurality of winding tubes 221 , and the plurality of winding tubes 221 are in a multi-layer sleeve form, and the spiral directions of the winding tubes 221 in adjacent layers are opposite.

[0044] The sleeve connection form described in this embodiment is as follows: a three-layer winding tube 221 is used for explanation, the spiral structure formed by the outermost winding tube 221 has the largest diameter, the spiral structure formed by the middle winding tube 221 has the second largest diameter, and the spiral structure formed by the inner winding tube 221 has the smallest diameter. All winding tubes 221 are in the form of springs, and as shown in FIG. Figure 1 As shown, the outermost winding tube rotates clockwise, the middle winding tube 221 rotates counterclockwise, and the innermost winding tube 221 rotates clockwise. This embodiment only provides a form with three layers of winding tubes 221. If there are more than three layers, the winding tubes 221 still follow the sleeve form and the spiral directions of adjacent winding tubes 221 are opposite.

[0045] It should be noted that in this embodiment, the lengths of the straight tube portion 21 and the winding tube portion 22 can be designed according to the actual working conditions, the length, diameter, material, etc. of the straight tube 211 and the winding tube 221. At the same time, this embodiment only provides one straight tube portion 21 and one winding tube portion 22. As needed, multiple straight tube portions 21 can be connected in series in the upper part, and multiple winding tube portions 22 can be connected in series in the lower part.

[0046] In this embodiment, a vertically arranged cylinder 1 is used, and the heat exchanger inside the cylinder 1 adopts two structures, a straight tube portion 21 is used in the upper part, and a winding tube portion 22 is used in the lower part; when the temperature of the shell and tube heat exchanger is high or the temperature difference between the upper and lower parts is large and the thermal stress of the tube is large, the straight tube portion 21 has a small temperature difference, and the stress in the tube is correspondingly reduced, and the expansion rate of the tube bundle is also correspondingly reduced; the winding tube portion 22 is used on the lower side, and the temperature difference is relatively reduced because it is at the lower part, but the structure of the winding tube portion 22 can make the tube bundle have a certain flexibility, so that the number of tubes can be normally deformed in the upper and lower directions due to thermal stress, and the heat exchanger will not be damaged; because the two heat exchange structures on the upper and lower sides are connected in series, even if the thermal stress on the upper side is large, the thermal stress will be transmitted to the lower side, so that the lower part can release the thermal stress of the number of tubes inside the heat exchanger through deformation, thereby protecting the heat exchanger.

[0047] Furthermore, the lower side of the heat exchanger adopts a winding tube portion 22, and the tube-side fluid and the shell-side liquid fully exchange heat, further increasing the supercooling of the tube-side medium, thereby improving the thermal utilization rate and the heat exchange capacity of peripheral equipment; and in the same cylinder 1, when the length of the heat exchange tube 2 is the same, compared with the straight tube structure, the length of the heat exchanger will be greatly reduced (when the winding tube 221 is straightened and the length is 6.59m, after being bent into a winding tube 221 with a pitch of 2, the overall length of the heat exchanger is reduced by 4.43 times), the tube-side fluid and the shell-side liquid fully exchange heat, further increasing the supercooling of the tube-side medium, thereby improving the thermal utilization rate and the heat exchange capacity of peripheral equipment and reducing the size of the equipment, and the space limitation of the heat exchanger in the actual application site will be greatly reduced, and the application field will be expanded as a result.

[0048] In this embodiment, a flow distributor 3 is arranged between the straight pipe portion 21 and the winding pipe portion 22. On the one hand, the working medium flowing through the straight pipe portion 21 can be homogenized before entering the winding pipe portion 22, thereby improving the uniformity of heat exchange; on the other hand, the upper straight pipe portion 21 and the lower winding pipe portion 22 are not directly connected, and the material or type of the upper straight pipe portion 21 and the lower winding pipe portion 22 can be adjusted by utilizing the working medium factor, thereby facilitating the replacement of the upper straight pipe portion 21 and the lower winding pipe portion 22, thereby further improving the unit volume utilization rate of the heat exchanger.

[0049] The lower part of this embodiment adopts a winding tube part 22. Firstly, it can fully contact with the shell-side fluid to increase the heat exchange efficiency. Secondly, the structural type of the winding tube 221 further increases the turbulence intensity between the shell-side fluid and the heat exchange tube 2, thereby further increasing the heat exchange efficiency. Thirdly, the flow curve of the winding tube 221 further increases the turbulence degree of the medium in the heat exchange tube 2, thereby once again increasing the heat exchange efficiency.

[0050] Embodiment 2:

[0051] like Figure 1 , Figure 3As shown, the confluence distributor 3 includes a connecting tube 31 and a flow equalizing plate 32. The top end of the connecting tube 31 is connected and communicated with the straight tube portion 21, and the bottom end is connected and communicated with the winding tube portion 22. The flow equalizing plate 32 is connected in the connecting tube 31. The flow equalizing plate 32 is roughly perpendicular to the flow direction of the fluid, and the flow equalizing plate 32 includes a plurality of flow equalizing holes.

[0052] It should be noted that the flow equalizing plate 32 is roughly perpendicular to the flow direction of the fluid. The flow equalizing plate 32 and the connecting tube 31 may be radially overlapped, or slightly inclined, as long as it does not affect the flow of the working medium. The flow equalizing plate 32 may be a circular plate or a plurality of arc-shaped plates.

[0053] In this embodiment, the connecting tube 31 is a Y-shaped structure, that is, the outer diameter of the top end is large and the outer diameter of the bottom end is small, so that a larger space is formed between the bottom end and the cylinder body 1, which is convenient for separating gas and liquid.

[0054] Since the outer diameter of the bottom of the connecting tube 31 is relatively small, the overall outer diameter of the winding tube portion 22 is limited, and accordingly the space between the winding tube portion 22 and the cylinder body 1 is enlarged.

[0055] This embodiment further includes a liquid level communication vessel 4, which is in communication with the side wall of the cylinder 1. The top of the liquid level communication vessel 4 is substantially flush with the connection between the straight tube portion 21 and the winding tube portion 22. The connection between the straight tube portion 21 and the winding tube portion 22 is the bottom of the connecting tube 31 where the outer diameter is smaller, and the liquid between the cylinder 1 and the winding tube portion 22 can display its height through the liquid level communication vessel 4.

[0056] When this embodiment is used, one working fluid enters the straight tube portion 21 and the winding tube portion 22 from the top in sequence and then flows out from the bottom. Another working fluid enters from the shell-side inlet 13 at the lower right corner and first exchanges heat with the winding tube portion 22. The liquid level is in the space between the converging distributor 3 and the cylinder 1. A larger space is convenient for achieving gas-liquid separation. The traditional space is smaller, and the separation effect is poor or separation cannot be achieved. That is, the outside of the winding tube portion 22 is liquid, which evaporates after heating. The evaporated gas or a small amount of liquid enters the outside of the straight tube portion 21 to continue heat exchange.

[0057] A larger cavity is formed between the Y-shaped connecting tube 31 and the cylinder 1, which can realize gas-liquid separation. Specifically, the tube-side and shell-side fluids of the wound tube portion 22 fully exchange heat, forming a medium with a higher dryness (or liquid-carrying rate) passing through the middle cavity portion for primary gas-liquid separation, and then the structure of the upper straight tube portion 21 further increases the sufficient heat exchange between the medium and the tube-side hot fluid, so that the outlet is basically free of liquid; the outlet dryness can be controlled by adjusting the liquid level connector 4 on the outside of the shell side. When the liquid level is high, the liquid-carrying rate is high, otherwise it can be free of liquid or present an overheated state, which is specifically adjusted according to actual process requirements.

[0058] 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 aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. High efficiency integrated shell and tube heat exchanger, characterized in that: It includes a vertically arranged cylinder and a heat exchange tube, one end of the cylinder includes a tube-side inlet and a shell-side outlet, and the other end of the cylinder includes a tube-side outlet and a shell-side inlet; the heat exchange tube is connected to the cylinder, and the heat exchange tube includes a straight tube portion and a winding tube portion connected in series in sequence, the straight tube portion is located at the upper part, and the winding tube portion is located at the lower part of the straight tube portion.

2. The high-efficiency integrated shell and tube heat exchanger according to claim 1, characterized in that: It also includes a confluence distributor, which is connected between the straight pipe part and the winding pipe part to achieve communication between the two.

3. The high-efficiency integrated shell and tube heat exchanger according to claim 2, characterized in that: The confluence distributor comprises a connecting tube and a flow equalizing plate. One end of the connecting tube is connected and communicated with the straight tube portion, and the other end is connected and communicated with the winding tube portion. The flow equalizing plate is connected inside the connecting tube.

4. The high-efficiency integrated shell and tube heat exchanger according to claim 3, characterized in that: The flow balancing plate is substantially perpendicular to the flow direction of the fluid, and includes a plurality of flow balancing holes.

5. The high-efficiency integrated shell and tube heat exchanger according to claim 3, characterized in that: The connecting cylinder is in a Y-shaped structure, and a gas-liquid separation chamber is formed between the outside of the Y-shaped structure and the cylinder body.

6. The high-efficiency integrated shell and tube heat exchanger according to claim 2, characterized in that: The straight pipe portion includes multiple straight pipes, a first fixed plate, a second fixed plate, and a baffle. The first fixed plate is connected to the cylinder, the second fixed plate is connected to the end of the confluence distributor, and the two ends of the straight pipe are respectively connected to the first fixed plate and the second fixed plate. The multiple straight pipes are arranged in parallel and evenly, and the baffle is passed through the straight pipe and connected to it.

7. The high-efficiency integrated shell and tube heat exchanger according to claim 2, characterized in that: The winding tube portion includes a plurality of winding tubes, and the plurality of winding tubes are in a multi-layer sleeved form, and the spiral directions of the winding tubes in adjacent layers are opposite.

8. The high-efficiency integrated shell and tube heat exchanger according to claim 1, characterized in that: The cylinder body includes a straight section, a first flange, and a second flange. Both ends of the straight section are connected to the first flange and the second flange respectively. The first flange includes a tube-side inlet, and the second flange includes a tube-side outlet. The top of the side wall of the straight section includes a shell-side outlet, and the bottom of the side wall of the straight section includes a shell-side inlet.

9. The high-efficiency integrated shell and tube heat exchanger according to claim 8, characterized in that: The pipe side inlet is communicated with the straight pipe portion, and the pipe side outlet is connected with the winding pipe portion.

10. The high-efficiency integrated shell and tube heat exchanger according to claim 1, characterized in that: It also includes a liquid level communicating vessel, which is in communication with the side wall of the cylinder, and the top of the liquid level communicating vessel is substantially flush with the connection between the straight tube portion and the winding tube portion.

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