Spiral baffle plate type heat exchanger

Abstract

The invention discloses a spiral baffle plate type heat exchanger, and relates to the technical field of heat exchange, the spiral baffle plate type heat exchanger comprises a shell pass, a plurality of heat exchange tubes and a plurality of rotational flow plates, the rotational flow plates are arranged in the shell pass, each rotational flow plate comprises an inclined plate and a horizontal plate, one end of each inclined plate is connected with the corresponding horizontal plate, and the other end of each inclined plate is connected with the horizontal plate of the adjacent rotational flow plate to form a stair-shaped structure; the outer edge of the stair-shaped structure is matched with the inner circumferential wall of the shell pass, a partition plate matched with the stair-shaped structure to form a spiral flowing path is arranged between the inclined plates of the adjacent rotational flow plates, and the heat exchange pipe is arranged on the spiral flowing path. The inclined plates, the horizontal plates and the partition plates are arranged, compared with rotational flow plates, the manufacturing difficulty is low, the precision requirement is low, the cost is low, meanwhile, continuous paths are formed through connection of the adjacent rotational flow plates, it can be guaranteed that media flow along the spiral flowing paths through cooperation of the partition plates, spiral heat exchange does not leak, and then the heat exchange effect is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange, and in particular to a spiral baffle heat exchanger. Background Art

[0002] A heat exchanger is an important component in chemical equipment. It uses the heat transfer temperature difference to transfer heat from the hot stream medium to the cold-side logistics. The efficiency of heat transfer is greatly related to the flow velocity and flow pattern of the hot and cold-side media. Generally, it includes a tube-side header, a shell-side cylinder, internal components, and heat exchange tubes arranged in the shell-side. The flow velocity and flow pattern of the medium in the heat exchange tubes are relatively single. Therefore, the heat transfer efficiency is often adjusted by adjusting the flow velocity and flow pattern of the medium in the shell-side.

[0003] A spiral baffle heat exchanger is a type of heat exchanger. By changing the structural form of the baffles in the heat exchanger and using spiral baffles, the shell-side fluid flows in a continuous spiral shape, reducing the dead zones of fluid flow, ensuring a uniform flow field, and the tube bundle is no longer alternately scoured by the fluid, thereby improving the heat transfer efficiency, reducing the shell-side resistance, improving the induced vibration, and reducing the fouling rate, etc. However, in the spiral baffle heat exchangers known to the applicant at present, the manufacturing difficulty of the spiral baffles is large, the precision requirements for tube passing are very high, and the cost is thus expensive; in addition, in another stepped spiral baffle heat exchanger known to the applicant, multiple fan-shaped or irregular plates are spliced layer by layer to form a structure similar to a spiral baffle in sections, which has problems such as high cost, difficult production and manufacturing, and serious leakage.

[0004] Therefore, there is an urgent need for a spiral baffle heat exchanger that can ensure no leakage in spiral heat exchange, effectively reduce the manufacturing difficulty, and has a low cost. Summary of the Invention

[0005] The purpose of the present invention is to provide a spiral baffle heat exchanger to solve the problems existing in the above-mentioned prior art. By forming a staircase-like structure through the cooperation of multiple swirl plates mainly composed of inclined plates and horizontal plates, and then cooperating with a partition plate to form a spiral flow path, it can ensure no leakage in spiral heat exchange, reduce the manufacturing difficulty, and reduce the cost.

[0006] To achieve the above purpose, the present invention provides the following solution: The present invention provides a spiral baffle heat exchanger, including a shell-side, a plurality of heat exchange tubes, and a plurality of swirl plates. The swirl plates are arranged in the shell-side. The swirl plate includes an inclined plate and a horizontal plate. One end of the inclined plate is connected to the horizontal plate, and the other end is connected to the horizontal plate of the adjacent swirl plate to form a staircase-like structure. The outer edge of the staircase-like structure matches the inner peripheral wall of the shell-side. A partition plate is arranged between the inclined plates of the adjacent swirl plates to cooperate with the staircase-like structure to form a spiral flow path. The heat exchange tubes are arranged on the spiral flow path.

[0007] Preferably, a plurality of the heat exchange tubes are arranged, and the cross-section of the heat exchange tube has a shape in which the width of one end corresponding to the fluid incoming direction is greater than the width of one end corresponding to the fluid outgoing direction.

[0008] Preferably, a cleanout opening that can be opened or closed is provided at a position between two adjacent horizontal plates on the same side of the shell side.

[0009] Preferably, the cleanout opening is located at the middle of the cylinder body of the shell side between two adjacent horizontal plates on the same side.

[0010] Preferably, the included angle between the inclined plate and the horizontal plate is 160° - 175°.

[0011] Preferably, the horizontal plate is semi-circular or rectangular, and the side wall of the horizontal plate that is flat is connected to the inclined plate.

[0012] Preferably, the horizontal plate and the inclined plate are integrally provided or separately provided.

[0013] Preferably, the fluid in the heat exchange tube flows from bottom to top, a fluid inlet is provided at the top of the side wall of the cylinder body of the shell side, and a fluid outlet is provided at the bottom of the side wall of the cylinder body.

[0014] Preferably, the pipe layout angle of the heat exchange tube is 45° or 90°.

[0015] The present invention mainly achieves the following technical effects compared with the prior art:

[0016] The spiral flow path of the overall shell side is mainly constituted by the swirl plate cooperating with the partition plate. Whether it is the inclined plate and the horizontal plate of the swirl plate or the partition plate, they all have lower manufacturing difficulty, lower precision requirements and lower cost than the spiral plate. Thus, the manufacturing difficulty, precision requirements and cost of the overall spiral baffle heat exchanger are reduced. At the same time, the connection of adjacent swirl plates forms a continuous path, and cooperating with the partition plate can ensure that the medium flows along the spiral flow path without generating a leakage flow that flows straight downwards, that is, the spiral heat exchange has no leakage, thereby ensuring the heat exchange effect.

[0017] Other solutions of the present invention achieve the following technical effects compared with the prior art:

[0018] When the heat exchanger needs to be cleaned, high-pressure water can be supplied between the upper and lower horizontal plates through the cleanout opening for cleaning, improving the cleaning effect.

[0019] The cross-section of the heat exchange tube has a shape in which the width of one end corresponding to the fluid incoming direction is greater than the width of one end corresponding to the fluid outgoing direction, which can cause the medium flow to generate vortices, increase its turbulence degree, can play the role of taking away impurities and dirt in the medium, and reduce the deposition speed and corrosion speed of impurities and dirt. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of a spiral baffle plate heat exchanger in the case of hiding heat exchange tubes in an embodiment of the present invention;

[0022] Figure 2 It is a schematic structural diagram of a spiral baffle plate heat exchanger in the case of hiding heat exchange tubes and the shell side cylinder in an embodiment of the present invention;

[0023] Figure 3 It is a front view of a spiral baffle plate heat exchanger in the case of hiding heat exchange tubes and the shell side cylinder in an embodiment of the present invention;

[0024] Figure 4 It is a left view of a spiral baffle plate heat exchanger in the case of hiding heat exchange tubes and the shell side cylinder in an embodiment of the present invention;

[0025] Figure 5 It is a top view of a spiral baffle plate heat exchanger in the case of hiding heat exchange tubes and the shell side cylinder in an embodiment of the present invention;

[0026] Figure 6 It is an axonometric view of a spiral baffle plate heat exchanger in the case of hiding heat exchange tubes and the shell side cylinder in an embodiment of the present invention;

[0027] Figure 7 It is a front view of a spiral baffle plate heat exchanger in the case of hiding the shell side cylinder in an embodiment of the present invention;

[0028] Figure 8 It is a schematic structural diagram of the cleaning port distribution in an embodiment of the present invention;

[0029] Figure 9 It is a schematic cross-sectional shape diagram of the heat exchange tubes in an embodiment of the present invention;

[0030] Among them, 1. Heat exchange tubes; 2. Inclined plates; 3. Horizontal plates; 4. Partition plates; 5. Cleaning ports; 6. Fluid inlets; 7. Fluid outlets; 8. Shell side. Detailed implementation manners

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] The object of the present invention is to provide a spiral baffle plate heat exchanger to solve the problems existing in the prior art. By forming a staircase-like structure through the cooperation of a plurality of swirl plates mainly composed of inclined plates and horizontal plates, and then cooperating with partition plates to form a spiral flow path, it can ensure that there is no leakage in spiral heat exchange, reduce the manufacturing difficulty, and reduce the cost.

[0033] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Please refer to Figures 1 to 9 As shown in the figure, a spiral baffle plate heat exchanger is provided, which includes a shell side 8, a plurality of heat exchange tubes 1, and a plurality of swirl plates. The swirl plates are arranged in the shell side 8, and the plurality of swirl plates are connected in sequence. The swirl plate includes an inclined plate 2 and a horizontal plate 3. One end of the inclined plate 2 is connected to the horizontal plate 3, and the other end is connected to the horizontal plate 3 of the adjacent swirl plate to form a staircase-like structure. The connection manner between the horizontal plate 3 and the inclined plate 2 can be welding. The outer edge of the staircase-like structure matches the inner peripheral wall of the shell side 8 to prevent the medium in the shell side 8 from leaking between the outer edge of the staircase-like structure and the inner peripheral wall of the shell side 8. A partition plate 4 is arranged between the inclined plates 2 of adjacent swirl plates to form a spiral flow path in cooperation with the staircase-like structure. Specifically, the two end faces of the partition plate 4 are respectively in contact with or welded to the side walls of the inclined plates 2 on both sides, and the two side walls of the partition plate 4 are respectively in contact with or welded to the side walls of the horizontal plates 3 on both sides to block the space in the middle part of the staircase-like structure and prevent leakage. The heat exchange tubes 1 are arranged on the spiral flow path in a way that penetrates through the inclined plates 2 and the horizontal plates 3. A fluid inlet 6 and a fluid outlet 7 are respectively arranged above and below the side wall of the shell side 8; the spiral flow path of the overall shell side 8 is mainly composed of the swirl plates in cooperation with the partition plate 4. Whether it is the inclined plate 2 and the horizontal plate 3 of the swirl plate or the partition plate 4, they all have lower manufacturing difficulty, lower precision requirements, and lower cost than the spiral plate, thereby reducing the manufacturing difficulty, precision requirements, and cost of the overall spiral baffle plate heat exchanger. At the same time, the connection of adjacent swirl plates forms a continuous path, and in cooperation with the partition plate 4, it can ensure that the medium flows along the spiral flow path without generating a leakage of straight downward flow, that is, there is no leakage in spiral heat exchange, thereby ensuring the heat exchange effect.

[0035] A plurality of heat exchange tubes 1 are arranged. In this embodiment, the cross-section of the heat exchange tube 1 has a shape where the width of one end corresponding to the fluid incoming direction is greater than the width of the other end corresponding to the fluid outgoing direction. Specifically, it can be a shape where one end is a semi-circle with a larger diameter and the other end is a semi-circle with a smaller diameter, that is, the heat exchange tube 1 presents a shape with one end large and the other end small, similar to a water droplet shape. The large-head ends of the heat exchange tubes 1 on both sides of the partition 4 face in opposite directions. Through this design, when the heat exchanger is used to treat sewage containing impurities and dirt, the distance between the large-head ends of adjacent heat exchange tubes 1 is small and the flow rate is fast, while the distance between the small-head ends is large and the flow rate is slow, making the flow rate uneven. As a result, vortices are generated at the small-head ends of the medium flow, increasing its turbulence degree, which can play a role in carrying away impurities and dirt in the medium, preventing a large amount of impurities and dirt from settling to the bottom and corroding the internal components of the shell side 8, and reducing the deposition rate of impurities and dirt and the corrosion rate; in another embodiment, the cross-section of the heat exchange tube 1 can also be circular or elliptical, and the distance between adjacent heat exchange tubes 1 also varies. Although the generated turbulence degree is relatively low, it can also play a role in reducing the dirt deposition and corrosion rate.

[0036] Cleaning ports 5 that can be opened or closed are provided at the positions between two adjacent horizontal plates 3 on the same side of the shell side 8. When the heat exchanger needs to be cleaned, the cleaning ports 5 can be opened, and a high-pressure water gun can be inserted into the cleaning ports 5 to clean the inside of the shell side 8, removing a small amount of deposited impurities and dirt. During cleaning, it should be cleaned layer by layer from top to bottom. When cleaning a single layer, just open the cleaning port 5 corresponding to that layer for cleaning. The fluid inlet 6 of the shell side 8 can be regarded as the cleaning port 5, and at the same time, the bottom fluid outlet 7 of the shell side 8 can be used as the cleaning water discharge port.

[0037] The cleaning port 5 is located in the middle of the cylinder body of the shell side 8 between two adjacent horizontal plates 3 on the same side, so that the cleaning port 5 can take into account the two inclined plates 2 corresponding to the staircase layer.

[0038] In this embodiment, the included angle between the inclined plate 2 and the horizontal plate 3 is 160° - 175° to ensure the flow rate and pressure drop of the swirling flow.

[0039] In this embodiment, the horizontal plate 3 is semi-circular or rectangular. The side wall of the horizontal plate 3 that is flat is connected to the inclined plate 2. When the horizontal plate 3 is semi-circular, the cross-section of the overall shell side 8 is kidney-shaped, and when the horizontal plate 3 is rectangular, the cross-section of the overall shell side 8 is rectangular.

[0040] The horizontal plate 3 and the inclined plate 2 can be integrally provided or separately provided. When integrally provided, the overall structural strength is relatively high, and the connection points of the staircase-like structure are reduced, correspondingly improving the installation convenience; when separately provided, the production difficulty and production precision can be further reduced.

[0041] The spiral baffle heat exchanger further includes a liquid inlet header and a liquid outlet header. The liquid inlet header is used for the inflow of the refrigerant, and the liquid outlet header is used for the outflow of the refrigerant. The liquid inlet header and the liquid outlet header are respectively arranged at both ends of the shell side 8. Both ends of the heat exchange tube 1 are respectively communicated with the liquid inlet header and the liquid outlet header. The arrangements of the liquid inlet header and the liquid outlet header play the roles of flow distribution and flow convergence, and they are respectively connected to the external refrigerant supply and refrigerant discharge pipelines through pipelines.

[0042] The liquid inlet header is located at the lower end of the shell side 8, and the liquid outlet header is located at the upper end of the shell side 8. With the design that a fluid inlet 6 is arranged at the top of the side wall of the cylinder body of the shell side 8 and a fluid outlet 7 is arranged at the bottom of the side wall of the cylinder body, the flowing direction of the refrigerant in the heat exchange tube 1 is from bottom to top, and the flowing direction of the medium in the shell side 8 is from top to bottom along the stairs, showing a countercurrent heat exchange as a whole, which improves the heat exchange effect.

[0043] In this embodiment, the pipe layout angle of the heat exchange tube 1 is 45° or 90°, that is, the included angle between the arrangement direction of the heat exchange tube 1 and the flowing direction of the medium in the shell side 8 is 45° or 90°, which is convenient for cleaning.

[0044] During the actual use process, the refrigerant flows in the heat exchange tube 1, and the medium in the shell side 8 moves downward layer by layer along the staircase-like structure to exchange heat with the refrigerant. After the heat exchanger works for a period of time, it can be shut down, and a high-pressure water gun can be inserted into the cleaning port 5 to clean the swirl plates layer by layer. After the cleaning is completed, the cleaning water is discharged from the fluid outlet 7, and at this time the heat exchanger can work again.

[0045] All adaptive changes made according to actual needs are within the protection scope of the present invention.

[0046] It should be noted that for those skilled in the art, obviously the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed by the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0047] Specific examples are used in the present invention to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A spiral baffle heat exchanger, characterized in that: It includes a shell side, a plurality of heat exchange tubes and a plurality of swirl plates, wherein the swirl plates are arranged in the shell side, the swirl plates include an inclined plate and a horizontal plate, one end of the inclined plate is connected to the horizontal plate, and the other end is connected to the horizontal plate of the adjacent swirl plate to form a stair-like structure, the outer edge of the stair-like structure matches the inner circumferential wall of the shell side, a partition is arranged between the inclined plates of adjacent swirl plates to cooperate with the stair-like structure to form a spiral flow path, and the heat exchange tubes are arranged on the spiral flow path.

2. The spiral baffle heat exchanger according to claim 1, characterized in that: A plurality of the heat exchange tubes are arranged in an array, and a cross section of the heat exchange tube is in a shape in which the width of one end corresponding to the direction of the fluid coming from is greater than the width of the other end corresponding to the direction of the fluid going out.

3. The spiral baffle heat exchanger according to claim 1, characterized in that: The positions between the two adjacent horizontal plates on the same side of the shell side are each provided with a cleaning port that can be opened or closed.

4. The spiral baffle heat exchanger according to claim 3, characterized in that: The cleaning port is located in the middle of the cylinder of the shell side between two adjacent horizontal plates on the same side.

5. The spiral baffle heat exchanger according to claim 1, characterized in that: The included angle between the inclined plate and the horizontal plate is 160°-175°.

6. The spiral baffle heat exchanger according to claim 1, characterized in that: The horizontal plate is semicircular or rectangular, and a plane side wall of the horizontal plate is connected to the inclined plate.

7. The spiral baffle heat exchanger according to claim 1, characterized in that: The horizontal plate and the inclined plate are arranged integrally or separately.

8. The spiral baffle heat exchanger according to claim 1, wherein the fluid in the heat exchange tube flows from bottom to top, a fluid inlet is provided at the top of the cylinder side wall of the shell side, and a fluid outlet is provided at the bottom of the cylinder side wall.

9. The spiral baffle heat exchanger according to claim 1, characterized in that: The heat exchange tubes are arranged at an angle of 45° or 90°.

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