Shell pass inlet spiral-flow type heat exchanger

Abstract

The utility model relates to the technical field of petrochemical equipment, in particular to a shell pass inlet spiral-flow type heat exchanger which comprises a main barrel and a tube plate which jointly define a shell pass, a heat exchange tube bundle is arranged in the main barrel, the end of the heat exchange tube bundle is fixed to a tube hole of the tube plate in a penetrating mode, and an outer flow collecting cover is arranged on the outer side of the main barrel. A flow collecting cavity is defined between the outer flow collecting cover and the main barrel, the outer flow collecting cover is provided with a shell pass medium input pipe communicated with the flow collecting cavity, a plurality of flow passing holes communicated with a shell pass and the flow collecting cavity are formed in the side wall of the main barrel, the flow passing holes are obliquely arranged relative to the radial direction of the main barrel, and a medium in the flow collecting cavity can rotate in the circumferential direction along the barrel wall after entering the shell pass. According to the core idea of the scheme, the entering direction of a shell pass medium is changed to avoid direct impact on the heat exchange tube bundle, impact on the heat exchange tube bundle can be reduced to a large extent, the medium is greatly buffered in the flow collecting cavity, erosion and vibration can be reduced, the structure is simple, and the manufacturing cost and the later maintenance cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical equipment, and particularly relates to a shell-side inlet swirl heat exchanger. Background Art

[0002] In the prior art, the medium at the shell-side inlet of a shell-and-tube heat exchanger is likely to impact the heat exchange tube bundle inside the shell-side. Generally, an impact plate is provided to prevent the direct impact of the inflowing fluid on the heat exchange tubes, thereby causing erosion and vibration of the heat exchange tubes. At the same time, it is also to avoid the thermal stress generated due to the uneven heating of the tubes, so as to play a role in protecting the heat exchange tubes. For example, the Chinese patent document with the publication number CN208075660U discloses a shell-side inlet buffer structure of a shell-and-tube heat exchanger, including a reduced-diameter connecting pipe and an impact plate. The reduced-diameter connecting pipe includes a conical pipe and a large connecting pipe and a small connecting pipe connected by the conical pipe. The other end of the large connecting pipe is connected to the shell-side cylinder body. The impact plate is connected to the inner wall of the conical pipe through two rib plates. The impact plate is located inside the large connecting pipe and its plate surface is in the radial direction of the large connecting pipe. The area of the impact plate is larger than the area of the small connecting pipe orifice and smaller than the area of the large connecting pipe orifice, saving the space inside the shell-side, and heat exchange tubes can be arranged densely inside it. Moreover, it is not necessary to increase the diameter of the shell-side cylinder body to ensure the heat exchange area, reducing the manufacturing cost of the equipment. At the same time, it will not cause fluid short-circuit, improving the heat exchange effect of the shell-and-tube heat exchanger.

[0003] Another example is the Chinese patent document with the publication number CN114485251A, which discloses an anti-impact and anti-vibration device for the shell-side inlet of a shell-and-tube heat exchanger, including a cylinder body, a buffer assembly, and an adjustment assembly. An inlet pipe is provided on the cylinder body. The buffer assembly includes an impact plate located inside the cylinder body, a fan blade located above the impact plate, and a first support column connected to the impact plate. The impact plate is fixedly connected to the cylinder body through the first support column. A rotating shaft is fixedly sleeved in the middle of the fan blade, and the rotating shaft is rotatably connected to the impact plate. The adjustment assembly is connected to the cylinder body through the buffer assembly. Through the buffer assembly, the pressure loss of the fluid at the inlet of the inlet pipe can be reduced, the impact of the fluid on the heat exchange tubes can be slowed down, and the excessive pressure difference between the upper and lower sides of the arc-shaped impact plate can be avoided, forming a vortex flow field and increasing the energy loss. The fluid can enter the tube bundle area of the heat exchange tubes evenly, thereby reducing equipment vibration and improving its anti-impact ability, ensuring the stable operation of the device.

[0004] The above anti-impact and anti-vibration structures provided at the shell-side inlet are complex in structure, high in manufacturing cost, and difficult and costly in later maintenance. Summary of the Invention

[0005] Aiming at the above technical problems existing in the prior art, the utility model provides a shell-side inlet swirl heat exchanger.

[0006] To achieve the above object, the utility model provides the following technical solutions:

[0007] Provided is a shell-side inlet swirl heat exchanger, which includes a main cylinder body and a tube sheet that jointly enclose a shell side. A heat exchange tube bundle is arranged in the main cylinder body, and the ends of the heat exchange tube bundle are fixedly arranged through the tube holes of the tube sheet. Its characteristics are as follows: An outer collector hood is arranged on the outer side of the main cylinder body. A collector cavity is formed between the outer collector hood and the main cylinder body. The outer collector hood is provided with a shell-side medium input pipe communicating with the collector cavity. A plurality of flow holes communicating the shell side with the collector cavity are opened on the side wall of the main cylinder body. The plurality of flow holes are arranged obliquely with respect to the radial direction of the main cylinder body, so that the medium in the collector cavity swirls into the shell side along the circumferential direction.

[0008] As a further optional solution, the inclination directions of the plurality of flow holes are the same or different.

[0009] As a further optional solution, a flow guiding member is arranged at the port of the flow hole close to the collector cavity. One port of the flow guiding member communicates with the flow hole, and the other port of the flow guiding member faces the direction where the shell-side medium input pipe is located.

[0010] As a further optional solution, the flow guiding member is arc-shaped, and the flow guiding member is fixedly welded to the side wall of the main cylinder body or integrally formed with each other.

[0011] As a further optional solution, the number of the outer collector hoods is more than two, and the outer collector hoods are arranged at intervals along the circumferential direction of the main cylinder body. The inclination directions of the flow holes corresponding to each outer collector hood are the same.

[0012] As a further optional solution, the outer collector hood is an arc-shaped body arranged along the circumferential direction of the main cylinder body, and the circumferential direction corresponds to the range of 20° to 360° of the main cylinder body.

[0013] As a further optional solution, the shell-side medium input pipe is located at the end of the outer collector hood, and the medium in the collector cavity enters the shell side non-uniformly along the circumferential direction of the main cylinder body.

[0014] As a further optional solution, the height of the outer collector hood increases or decreases along the circumferential direction; and / or the distribution density or aperture of the plurality of flow holes changes along the circumferential direction of the main cylinder body.

[0015] As a further optional solution, the flow holes are circular holes, long strip holes or polygonal holes.

[0016] As a further optional solution, a preset distance is left between the heat exchange tube bundle and the flow holes, so that an avoidance space is formed between the heat exchange tube bundle and the flow holes in the main cylinder body.

[0017] The beneficial effects of the present utility model:

[0018] A swirl - flow heat exchanger at the shell - side inlet of the present utility model, when in use, the medium flows into the manifold cavity from the shell - side medium inlet pipe. After filling the manifold cavity, it enters the shell - side through each flow - through hole. Due to the setting of the outer manifold cover, the medium can be greatly buffered in the manifold cavity, avoiding the erosion and vibration caused by the direct injection of the traditional large inlet pipe towards the heat - exchange tube bundle. Moreover, the flow - through holes are arranged radially inclined relative to the main cylinder body. Therefore, the medium in the manifold cavity can flow circumferentially along the cylinder wall in a swirl after entering the shell - side. The core idea of this case is to change the inlet direction of the shell - side medium to avoid directly hitting the heat - exchange tube bundle, which can greatly reduce the impact on the heat - exchange tube bundle, and can also reduce erosion and vibration. In addition, the structure is simple, which can reduce the manufacturing cost and the later maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. 6 is a perspective view of the first embodiment of a swirl - flow heat exchanger at the shell - side inlet of the present utility model, with only partial illustration of the main cylinder body and the heat - exchange tubes.

[0020] Figure 2 is Figure 1 the top view of.

[0021] Figure 3 is Figure 2 the enlarged view at A in.

[0022] Figure 4 FIG. 22 is a schematic view of the second embodiment of a swirl - flow heat exchanger at the shell - side inlet of the present utility model.

[0023] Figure 5 is Figure 4 the enlarged view at B in.

[0024] Figure 6 is Figure 4 the sectional perspective view and the partial enlarged schematic view of.

[0025] Figure 7 FIG. 38 is a schematic view of the third embodiment of a swirl - flow heat exchanger at the shell - side inlet of the present utility model.

[0026] Figure 8 FIG. 42 is a schematic view of the fourth embodiment of a swirl - flow heat exchanger at the shell - side inlet of the present utility model.

[0027] Figure 9 FIG. 46 is a schematic view of the fifth embodiment of a swirl - flow heat exchanger at the shell - side inlet of the present utility model.

[0028] Figure 10 FIG. 50 is a schematic view of another form of the fifth embodiment of a swirl - flow heat exchanger at the shell - side inlet of the present utility model.

[0029] Reference numerals:

[0030] Main cylinder body 1, flow-through holes 11, tube sheet 2, heat exchange tube bundle 3, outer flow collector 4, flow collection cavity 5, shell-side medium input pipe 6, and flow guide member 7. Specific embodiments

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0032] One of the embodiments of a shell-side inlet swirl heat exchanger of the present invention is as Figures 1 to 3 shown, including a main cylinder body 1 and a tube sheet 2 that jointly enclose the shell side. A heat exchange tube bundle 3 is arranged in the main cylinder body 1. The ends of the heat exchange tube bundle 3 pass through and are fixed in the tube holes of the tube sheet 2. The main cylinder body 1 is a circular cylinder, and the heat exchange tube bundle 3 is a densely arranged and juxtaposed metal tube, which is only briefly shown in the figure. The main improvement is:

[0033] An outer flow collector 4 is provided on the outer side of the main cylinder body 1. The periphery of the outer flow collector 4 is fixedly welded and sealed to the outer wall of the main cylinder body 1. A flow collection cavity 5 is formed between the outer flow collector 4 and the main cylinder body 1. The outer flow collector 4 is provided with a shell-side medium input pipe 6 communicating with the flow collection cavity 5. A plurality of flow-through holes 11 communicating with the shell side and the flow collection cavity 5 are opened on the side wall of the main cylinder body 1. The plurality of flow-through holes 11 are arranged obliquely with respect to the radial direction of the main cylinder body 1 so that the medium in the flow collection cavity 5 swirls into the shell side along the circumferential direction. In practice, the flow-through holes 11 can be arranged tangentially to the main cylinder body 1. When in use, the medium flows into the flow collection cavity 5 from the shell-side medium input pipe 6 and enters the shell side through each flow-through hole 11 after filling the flow collection cavity 5. Due to the provision of the outer flow collector 4, the medium can be buffered to a greater extent in the flow collection cavity 5, avoiding erosion and vibration caused by the direct injection of a traditional large inlet pipe directly against the heat exchange tube bundle 3. Furthermore, since the flow-through holes 11 are arranged obliquely with respect to the radial direction of the main cylinder body 1, the medium in the flow collection cavity 5 can swirl along the circumferential direction along the cylinder wall after entering the shell side, which can greatly reduce the impact on the heat exchange tube bundle 3, and can also reduce erosion and vibration. Moreover, the structure is simple, which can reduce the manufacturing cost and the later maintenance cost.

[0034] In this embodiment, the inclination directions of the plurality of flow-through holes 11 are the same. Therefore, after the medium in the flow collection cavity 5 passes through each flow-through hole 11, it swirls in the same circumferential direction in the main cylinder body 1. Of course, in practice, if it is changed to be inconsistent, the medium entering through some flow-through holes 11 flows clockwise, while the medium entering through the other part of the flow-through holes 11 flows counterclockwise. These two parts of the medium buffer against each other in the circumferential direction of the main cylinder body 1, which can also be used as one of the special embodiments.

[0035] Specifically, the flow-through holes 11 are round holes, long strip holes or polygonal holes.

[0036] Specifically, a preset distance is left between the heat exchange tube bundle 3 and the flow-through holes 11, so that a clearance space is formed between the heat exchange tube bundle 3 and the flow-through holes 11 in the main cylinder body 1.

[0037] Actually, a heating module (not shown in the figure) for heating the medium therein can be arranged in the manifold chamber 5 to further vaporize the gas-liquid mixed medium in the manifold chamber 5. The heating module can adopt heating methods such as electric heating rods and electromagnetic induction.

[0038] Embodiment two of a shell-side inlet swirl heat exchanger of the present utility model. The main technical solution of this embodiment is the same as that of embodiment one. For the features not explained in this embodiment, the explanations in embodiment one are adopted and will not be elaborated here. The difference between this embodiment and embodiment one is that, as Figures 4 to 6 shown, a flow guide member 7 is arranged at the port of the flow-through hole 11 close to the manifold chamber 5. One port of the flow guide member 7 communicates with the flow-through hole 11, and the other port of the flow guide member 7 faces the direction where the shell-side medium input pipe 6 is located. The inner wall of the flow guide member 7 is arranged flush with the hole wall of the flow-through hole 11, which is convenient for guiding the medium in the manifold chamber 5 into the flow-through hole 11.

[0039] Specifically, the flow guide member 7 is arc-shaped, and the flow guide member 7 is fixedly welded to the side wall of the main cylinder body 1 or integrally formed therewith.

[0040] Embodiment three of a shell-side inlet swirl heat exchanger of the present utility model. The main technical solution of this embodiment is the same as that of embodiment one. For the features not explained in this embodiment, the explanations in embodiment one are adopted and will not be elaborated here. The difference between this embodiment and embodiment one is that, as Figure 7 shown, the number of the outer manifold covers 4 is two, and the outer manifold covers 4 are arranged at intervals along the circumferential direction of the main cylinder body 1. The inclination directions of the flow-through holes 11 corresponding to the outer manifold covers 4 are the same. Of course, in practice, the number of the outer manifold covers 4 can be changed to three, four or other numbers. The outer manifold covers 4 of this embodiment are located at the same height of the main cylinder body 1, and can actually be changed to be located at different heights of the main cylinder body 1.

[0041] Embodiment four of a shell-side inlet swirl heat exchanger of the present utility model. The main technical solution of this embodiment is the same as that of embodiment one. For the features not explained in this embodiment, the explanations in embodiment one are adopted and will not be elaborated here. The difference between this embodiment and embodiment one is that, as Figure 8 shown, the outer manifold cover 4 is an arc-shaped body arranged along the circumferential direction of the main cylinder body 1, and circumferentially corresponds to a range of 180° of the main cylinder body 1. Of course, in practice, the circumferential span of the outer manifold cover 4 can be selected in the range of 20° to 360°.

[0042] Embodiment 5 of a shell-side inlet swirl heat exchanger of the present utility model. The main technical solution of this embodiment is the same as that of Embodiment 1. For the features not explained in this embodiment, the explanations in Embodiment 1 are adopted and will not be elaborated here. The difference between this embodiment and Embodiment 1 is that, as Figure 9 and Figure 10 shown, the shell-side medium input pipe 6 is located at the end of the outer collector hood 4, and the medium in the collector cavity 5 enters the shell side non-uniformly along the circumferential direction of the main cylinder 1. This non-uniformity can be achieved in the following ways: As Figure 9 shown, in the direction away from the shell-side medium input pipe 6 (from right to left), the height of the outer collector hood 4 gradually decreases. Thus, the farther away from the shell-side medium input pipe 6, the less the medium in the collector cavity 5, and correspondingly, the less the medium entering the shell side; as shown in 10, in the direction away from the shell-side medium input pipe 6 (from right to left), the height of the outer collector hood 4 gradually increases. Thus, the farther away from the shell-side medium input pipe 6, the more the medium in the collector cavity 5, and correspondingly, the greater the medium entering the shell side. Figure 9 and Figure 10 The height of the outer collector hood 4 in both cases changes gradually, and actually, it can be changed to a stepped change. In fact, the non-uniformity can also be achieved by changing the distribution density of the plurality of flow holes 11 and the aperture change of the plurality of flow holes 11. For example, the farther away from the shell-side medium input pipe 6, the greater the density of the flow holes 11, and / or the larger the aperture.

[0043] As can be seen from the above, on the premise that the above embodiments do not conflict with each other, they can be freely combined and superimposed to form new embodiments, which will not be elaborated here.

[0044] In the description of the present utility model, obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The components of the embodiments of the present utility model usually described and shown in the drawings here can be arranged and designed in various different configurations.

[0045] Therefore, the above detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model claimed, but only represents the selected embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0046] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "set", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

Claims

1. A shell-side inlet cyclone heat exchanger, comprising a main cylinder (1) and a tube sheet (2) which together form a shell side, a heat exchange tube bundle (3) being arranged in the main cylinder (1), and tube holes fixed to the tube sheet (2) being provided at the ends of the heat exchange tube bundle (3), wherein: An outer flow collecting cover (4) is arranged on the outer side of the cylinder (1); a flow collecting chamber (5) is formed between the outer flow collecting cover (4) and the main cylinder (1); a shell side medium inlet pipe (6) connected to the flow collecting chamber (5) is arranged on the outer flow collecting cover (4); a plurality of flow holes (11) connected to the shell side and the flow collecting chamber (5) are opened on the side wall of the main cylinder (1); the plurality of flow holes (11) are arranged to be inclined relative to the radial direction of the main cylinder (1) so that the medium in the flow collecting chamber (5) swirls into the shell side along the circumferential direction.

2. A shell side inlet cyclone heat exchanger according to claim 1, characterized in that: The inclination directions of the plurality of flow holes (11) are the same or different.

3. The shell side inlet cyclone heat exchanger according to claim 1, characterized in that: A flow guide (7) is provided at a port of the flow hole (11) close to the manifold (5), one port of the flow guide (7) is connected to the flow hole (11), and the other port of the flow guide (7) faces the position of the shell-side medium input pipe (6).

4. A shell-side inlet cyclone heat exchanger according to claim 3, characterized in that: The flow guide (7) is arc-shaped, and the flow guide (7) and the side wall of the main cylinder (1) are welded and fixed to each other, or are integrally formed with each other.

5. The shell side inlet cyclone heat exchanger according to claim 1, characterized in that: The number of the outer collecting covers (4) is more than two, and the outer collecting covers (4) are arranged at intervals along the circumference of the main cylinder (1), and the inclination directions of the flow holes (11) corresponding to the outer collecting covers (4) are the same.

6. The shell-side inlet cyclone heat exchanger according to claim 1, characterized in that: The outer collecting cover (4) is an arc-shaped body arranged along the circumference of the main cylinder (1), and the circumference corresponds to a range of 20° to 360° of the main cylinder (1).

7. The shell-side inlet cyclone heat exchanger according to claim 6, characterized in that: The shell side medium input pipe (6) is located at the end of the outer collecting cover (4), and the medium in the collecting cavity (5) enters the shell side non-uniformly along the circumference of the main cylinder (1).

8. The shell side inlet cyclone heat exchanger according to claim 7, characterized in that: The height of the outer collecting cover (4) increases or decreases along the circumferential direction; and / or the distribution density or aperture of the plurality of flow holes (11) along the circumferential direction of the main cylinder (1) changes.

9. The shell side inlet cyclone heat exchanger according to claim 1, characterized in that: The flow hole (11) is a circular hole, an elongated hole or a polygonal hole.

10. The shell side inlet cyclone heat exchanger according to claim 1, characterized in that: A preset distance is left between the heat exchange tube bundle (3) and the flow hole (11), so that an escape space is formed between the heat exchange tube bundle (3) and the flow hole (11) in the main cylinder (1).

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