Air inlet type heat exchanger capable of collecting flow outside shell pass

Abstract

The utility model relates to the technical field of petrochemical equipment, in particular to a shell pass external flow collection air inlet type heat exchanger which comprises a main cylinder and a tube plate which jointly define a shell pass, a heat exchange tube bundle is arranged in the main cylinder, an external flow collection cover is arranged on the outer side of the main cylinder, and a flow collection cavity is defined between the external flow collection cover and the main cylinder. 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 the shell pass and the flow collecting cavity are formed in the side wall of the main barrel, the flow area of a channel from the flow collecting cavity to the shell pass through the flow passing holes is reduced, the speed of a medium in the flow collecting cavity is increased in the process of entering the shell pass, and a gas-liquid mixed medium in the flow collecting cavity is further gasified. Compared with a liquid medium and a gas-liquid mixed medium, the impact force of the gaseous medium is small. According to the core idea of the scheme, the gas-liquid mixed medium is fully gasified and impacts the heat exchange tube bundle in a gas state, impact on the heat exchange tube bundle can be reduced to a large extent, erosion and vibration can also 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 an air inlet heat exchanger with external flow collection in the shell side. Background Art

[0002] In the prior art, the medium at the inlet of the shell side of a shell-and-tube heat exchanger is likely to impact the heat exchange tube bundle in 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 buffer structure at the inlet of the shell side 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 and improve 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 at the inlet of the shell side 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 are provided at the inlet of the shell side, with complex structures, high manufacturing costs, and high difficulty and cost in later maintenance. Summary of the Invention

[0005] In view of the above technical problems existing in the prior art, the utility model provides an air inlet heat exchanger with external flow collection in the shell side.

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

[0007] Provided is an intake heat exchanger with external flow collection in the shell side, which includes a main cylinder body and a tube sheet that jointly enclose the 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 inserted through the tube holes of the tube sheet. The characteristics are as follows: An external flow collection cover is arranged outside the main cylinder body. A flow collection cavity is formed between the external flow collection cover and the main cylinder body. The external flow collection cover is provided with a shell side medium input pipe communicating with the flow collection cavity. A plurality of flow through holes communicating the shell side and the flow collection cavity are opened on the side wall of the main cylinder body. The flow area of the channel from the flow collection cavity through the flow through holes to the shell side is arranged to decrease.

[0008] As a further optional solution, the flow collection cavity is provided with a heating module for heating the medium therein.

[0009] As a further optional solution, the aperture diameter of the flow through holes gradually decreases in the direction towards the shell side.

[0010] As a further optional solution, a speed increasing guide tube is arranged at the port of the flow through hole close to the flow collection cavity, and the aperture diameter of the speed increasing guide tube gradually decreases in the direction towards the flow through hole.

[0011] As a further optional solution, the guide member is arc-shaped, and the guide member is fixedly welded to the side wall of the main cylinder body or integrally formed with each other.

[0012] As a further optional solution, a guide member is arranged at the port of the flow through hole close to the flow collection cavity. One port of the guide member communicates with the flow through hole, and the other port of the guide member faces the orientation where the shell side medium input pipe is located.

[0013] As a further optional solution, the number of the external flow collection covers is more than two, and each external flow collection cover is arranged at intervals along the circumferential direction of the main cylinder body.

[0014] As a further optional solution, the external flow collection cover 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.

[0015] As a further optional solution, the shell side medium input pipe is located at the end of the external flow collection cover, and the medium in the flow collection cavity enters the shell side non-uniformly along the circumferential direction of the main cylinder body.

[0016] As a further optional solution, the height of the external flow collection cover increases or decreases along the circumferential direction; and / or the distribution density or aperture diameter of the plurality of flow through holes changes along the circumferential direction of the main cylinder body.

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

[0018] An intake heat exchanger with external flow collection in the shell side. When in use, the medium flows into the flow collection cavity from the shell side medium input pipe. After filling the flow collection cavity, it enters the shell side through each flow-through hole. Due to the setting of the external flow collection cover, the medium can be greatly buffered in the flow collection cavity, avoiding erosion and vibration caused by the traditional large inlet pipe directly spraying against the heat exchange tube bundle. Moreover, the flow area of the channel from the flow collection cavity to the shell side through the flow-through hole is set to decrease. Therefore, the medium in the flow collection cavity speeds up during the process of entering the shell side, causing the gas-liquid mixed medium in the flow collection cavity to further vaporize. The impact force of the gaseous medium is smaller than that of the liquid and gas-liquid mixed media. The core idea of this case is to fully vaporize the gas-liquid mixed medium and impact the heat exchange tube bundle in the form of gas, which can greatly reduce the impact on the heat exchange tube bundle, and can also reduce erosion and vibration. Moreover, 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 an intake heat exchanger with external flow collection in the shell side of the present utility model, with only partial illustration of the main cylinder 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 C in.

[0022] Figure 4 FIG. 22 is a partial schematic view of the second embodiment of an intake heat exchanger with external flow collection in the shell side of the present utility model.

[0023] Figure 5 FIG. 26 is a sectional perspective view and a partial enlarged schematic view of the second embodiment of an intake heat exchanger with external flow collection in the shell side of the present utility model.

[0024] Figure 6 is Figure 5 the schematic view of a further improvement of the heat exchanger shown in, mainly showing that the inner wall of the flow guide member is conical.

[0025] Figure 7 FIG. 36 is a schematic view of the third embodiment of an intake heat exchanger with external flow collection in the shell side of the present utility model.

[0026] Figure 8 FIG. 40 is a schematic view of the fourth embodiment of an intake heat exchanger with external flow collection in the shell side of the present utility model.

[0027] Figure 9 FIG. 44 is a schematic view of the fifth embodiment of an intake heat exchanger with external flow collection in the shell side of the present utility model.

[0028] Figure 10Schematic diagram of another form of Embodiment 5 of an air inlet heat exchanger with external collector in the shell side of the present utility model.

[0029] Figure 11 Schematic diagram of another arrangement of the heat exchange tube bundle of an air inlet heat exchanger with external collector in the shell side of the present utility model.

[0030] Reference numerals:

[0031] Main cylinder body 1, flow-through holes 11, tube sheet 2, heat exchange tube bundle 3, external collector cover 4, collector cavity 5, shell-side medium input pipe 6, flow guide member 7. Specific implementation manners

[0032] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0033] One of the embodiments of an air inlet heat exchanger with external collector in the shell side of the present utility model 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 are penetrated and fixed in the tube holes of the tube sheet 2. The main cylinder body 1 is a whole-round cylinder body, 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:

[0034] An outer collector cover 4 is arranged on the outer side of the main cylinder body 1. The periphery of the outer collector cover 4 is fixedly welded and sealed to the outer wall of the main cylinder body 1. A collector cavity 5 is formed between the outer collector cover 4 and the main cylinder body 1. The outer collector cover 4 is provided with a shell-side medium input pipe 6 communicating with the collector cavity 5. A plurality of flow holes 11 communicating the shell side with the collector cavity 5 are opened on the side wall of the main cylinder body 1. The flow area of the channel from the collector cavity 5 through the flow holes 11 to the shell side is set to be reduced. Specifically, the flow holes 11 are conical, and their aperture gradually decreases towards the shell side. During use, a high-boiling-point first material (liquid phase or gas-liquid mixed phase) and a low-boiling-point second material (gas phase) are mixed to form an azeotropic mixed fluid. Compared with the pure first material, the proportion of the high-boiling-point material in the azeotropic mixed fluid is reduced, thereby reducing the boiling point of the azeotropic mixed fluid and making it easier to vaporize. The azeotropic mixed fluid flows into the collector cavity 5 from the shell-side medium input pipe 6 and enters the shell side through each flow hole 11 after filling the collector cavity 5. Due to the arrangement of the outer collector cover 4, the medium can be buffered to a large extent in the collector cavity 5, avoiding erosion and vibration caused by the direct injection of a traditional large inlet pipe onto the heat exchange tube bundle 3. Moreover, since the flow area of the channel from the collector cavity 5 through the flow holes 11 to the shell side is set to be reduced, the gas-liquid mixed medium in the collector cavity 5 speeds up, the pressure drops, the boiling point decreases, and the vaporization ratio of the azeotropic mixed fluid increases during the process of entering the shell side, causing the gas-liquid mixed medium in the collector cavity to be further vaporized. The impact force of the gaseous medium is smaller than that of the liquid and gas-liquid mixed state media. The core idea of this case is to fully vaporize the gas-liquid mixed medium and impact the heat exchange tube bundle 3 in the form of gas, 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.

[0035] Specifically, the flow 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 holes 11, so as to form an avoidance space between the heat exchange tube bundle 3 and the flow holes 11 in the main cylinder body 1. Since erosion prevention is achieved, in practice, it can be changed to as Figure 11 shown, the heat exchange tube bundle 3 fills the inner periphery of the entire tube sheet 2, realizing the maximum utilization of the tube sheet 2 and enabling more tubes to be arranged.

[0037] Specifically, a heating module (not shown in the figure) for heating the medium therein can be arranged in the collector cavity 5 to further vaporize the gas-liquid mixed medium in the collector cavity 5. Combined with the reduced-diameter flow holes 11, it further ensures that the medium entering the shell side is fully vaporized. The heating module can adopt heating methods such as electric heating rods and electromagnetic induction.

[0038] The second embodiment of the intake heat exchanger with external fluid collection in the shell side. The main technical solution of this embodiment is the same as that of the first embodiment. For the features not explained in this embodiment, the explanations in the first embodiment are adopted and will not be elaborated here. The difference between this embodiment and the first embodiment is that, as Figures 4 to 5 shown, a flow guiding member 7 is arranged at the port of the flow-through hole 11 close to the fluid collection chamber 5. One port of the flow guiding member 7 communicates with the flow-through hole 11, and the other port of the flow guiding member 7 faces the direction of the shell-side medium input pipe 6. The inner wall of the flow guiding member 7 is arranged flush with the hole wall of the flow-through hole 11, facilitating the introduction of the medium in the fluid collection chamber 5 into the flow-through hole 11.

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

[0040] In practice, the way to reduce the flow area of the channel from the fluid collection chamber 5 through the flow-through hole 11 to the shell side can also be: as Figure 6 shown, the flow guiding member 7 is changed to an accelerating flow guiding pipe, and the aperture of the accelerating flow guiding pipe gradually decreases towards the flow-through hole, such as a funnel-shaped cone, which can also achieve the acceleration of the medium during the flow from the fluid collection chamber 5 to the shell side. In short, as long as there is a section with a reduced diameter in the channel between the fluid collection chamber 5 and the shell side, it can be the flow-through hole 11 with a reduced diameter, or the flow guiding member 7 with a reduced diameter, and of course, both can be reduced in diameter simultaneously.

[0041] The third embodiment of the intake heat exchanger with external fluid collection in the shell side. The main technical solution of this embodiment is the same as that of the first embodiment. For the features not explained in this embodiment, the explanations in the first embodiment are adopted and will not be elaborated here. The difference between this embodiment and the first embodiment is that, as Figure 7 shown, the number of the external fluid collection covers 4 is two, and the external fluid collection covers 4 are arranged at intervals along the circumferential direction of the main cylinder 1. Of course, in practice, the number of the external fluid collection covers 4 can be changed to three, four or other numbers. The external fluid collection covers 4 in this embodiment are located at the same height of the main cylinder 1, and can actually be changed to be located at different heights of the main cylinder 1.

[0042] The fourth embodiment of the intake heat exchanger with external fluid collection in the shell side. The main technical solution of this embodiment is the same as that of the first embodiment. For the features not explained in this embodiment, the explanations in the first embodiment are adopted and will not be elaborated here. The difference between this embodiment and the first embodiment is that, as Figure 8 shown, the external fluid collection cover 4 is an arc-shaped body arranged along the circumferential direction of the main cylinder 1, and circumferentially corresponds to a range of 180° of the main cylinder 1. Of course, in practice, the circumferential span of the external fluid collection cover 4 can be selected within the range of 20° to 360°.

[0043] Embodiment 5 of an air intake heat exchanger with external flow collection in the shell side. 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 external flow collection cover 4, and the medium in the flow collection 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 external flow collection cover 4 gradually decreases. Thus, the farther away from the shell side medium input pipe 6, the less medium in the flow collection cavity 5, and the less corresponding medium enters 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 external flow collection cover 4 gradually increases. Thus, the farther away from the shell side medium input pipe 6, the more medium in the flow collection cavity 5, and the more corresponding medium enters the shell side. Figure 9 and Figure 10 The height of the external flow collection cover 4 in both cases gradually changes, 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 multiple flow-through holes 11 and the aperture change of the multiple flow-through holes 11. For example, the farther away from the shell side medium input pipe 6, the greater the density of the flow-through holes 11, and / or the larger the aperture.

[0044] 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.

[0045] In the description of the present utility model, obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all 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.

[0046] 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 to be protected, 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.

[0047] 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 usually 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 distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0048] 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. An air intake heat exchanger with external flow collection on the shell side, 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 input 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), and the flow area of ​​the passage from the flow collecting chamber (5) to the shell side through the flow holes (11) is reduced.

2. The air intake heat exchanger with outer shell side flow collection according to claim 1, characterized in that: The manifold (5) is provided with a heating module for heating the medium therein.

3. The air intake heat exchanger with outer shell side collection according to claim 1, characterized in that: The diameter of the flow hole (11) gradually decreases toward the shell side.

4. The air intake heat exchanger with outer shell side flow collection according to claim 1, characterized in that: A speed-increasing flow guide tube is arranged at a port of the flow hole (11) close to the manifold (5), and the aperture of the speed-increasing flow guide tube gradually decreases towards the flow hole (11).

5. The air intake heat exchanger with outer shell side flow collection 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).

6. The air intake heat exchanger with outer shell side flow collection according to claim 5, 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.

7. The air intake heat exchanger with outer shell side flow collection 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).

8. The air intake heat exchanger with outer shell side flow collection 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).

9. The air intake heat exchanger with outer shell side flow collection according to claim 8, characterized in that: The shell side medium inlet 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).

10. The air intake heat exchanger with outer shell side flow collection according to claim 9, 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.

Images