Heat exchanger

Abstract

The utility model relates to a heat exchanger which comprises a shell pass cylinder, a flow guide part, a first tube box and a second tube box, and the shell pass cylinder is provided with a first outlet; the flow guide part comprises an outer flow guide cylinder, the first end of the outer flow guide cylinder is connected to one end of the shell pass cylinder, a reverse flange is arranged at the second end opposite to the first end, and a first inlet is formed in the outer flow guide cylinder; the first tube box is connected to one side of the reverse flange, and a second inlet and a second outlet are formed in the first tube box; the second tube box is connected to one end of the shell pass cylinder, and a heat exchange flow path is formed in the heat exchanger. The outer guide cylinder is connected with the first tube box through the reverse flange, the distance between the outer guide cylinder and the first tube box is reduced while stable connection of the guide part and the first tube box is guaranteed, and therefore the heat exchange area of a first heat exchange medium and a heat exchange flow path is increased, a heat exchange dead zone is reduced, and the heat exchange efficiency of the heat exchanger is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of petrochemical equipment, and in particular, to a heat exchanger. Background Art

[0002] The floating head heat exchanger has the advantages of simple structure, low manufacturing cost, large processing capacity, easy disassembly and cleaning. When designing the floating head heat exchanger, in order to avoid the direct impact of the high-speed fluid on the heat exchange tube at the shell inlet, causing problems such as tube bundle vibration, and to make the fluid medium as evenly distributed as possible, make full use of the heat exchange area of ​​the shell inlet section of the tube bundle, and reduce the fluid flow and heat transfer dead zone, it is usually necessary to set a guide tube structure at the shell inlet of the heat exchanger. The guide tube structure has two types: inner guide tube and outer guide tube. The outer guide tube structure is to add an enlarged cylinder to the shell cylinder to diffuse the shell inlet fluid so that the fluid flows into the tube bundle evenly and dispersedly. The outer guide tube structure is more widely used in floating head heat exchangers because it allows the heat exchanger to arrange more heat exchange tubes.

[0003] In the external guide tube structure commonly used in floating head heat exchangers, a section of outer cylinder with enlarged diameter is usually arranged on the shell cylinder, and the two sides of the outer cylinder are connected to the outer wall of the shell cylinder through a side plate to form a cavity between the outer wall of the shell cylinder, and a shell inlet connected to the cavity is arranged on the outer cylinder, and a rectangular hole connected to the cavity is arranged on the shell cylinder, so that the fluid can flow into the shell cylinder through the shell inlet, the cavity, and the rectangular hole in sequence. The disadvantage of this external guide tube structure is that since the distance between the shell inlet and the rectangular hole on the shell circle and the pipe box at the fixed end is relatively far, after the fluid medium enters the tube bundle, it directly flows to the pipe box at the floating end, resulting in a dead zone in a part of the tube bundle near the fixed end of the pipe box, which does not play a heat exchange role and reduces the heat exchange efficiency. Utility Model Content

[0004] The purpose of the present disclosure is to provide a heat exchanger which can reduce the heat exchange dead zone and improve the heat exchange efficiency.

[0005] In order to achieve the above-mentioned purpose, the present disclosure provides a heat exchanger, comprising: a shell-side cylinder, provided with a first outlet for a first heat exchange medium to flow; a flow guide, comprising an outer flow guide tube, a first end of the outer flow guide tube is connected to one end of the shell-side cylinder, a second end opposite to the first end is provided with a reverse flange, and a first inlet for the first heat exchange medium to flow is provided on the outer flow guide tube; a first pipe box, connected to a side of the reverse flange away from the shell-side cylinder, the first pipe box is provided with a second inlet and a second outlet; and a second pipe box, connected to an end of the shell-side cylinder away from the outer flow guide tube, a heat exchange flow path connected between the second inlet and the second outlet is formed inside the heat exchanger, and the heat exchange flow path runs through the shell-side cylinder so that the second heat exchange medium flowing through the heat exchange flow path can exchange heat with the first heat exchange medium.

[0006] Optionally, the inner diameter of the outer draft tube is larger than the inner diameter of the shell-side cylinder, the first end of the outer draft tube is connected to the shell-side cylinder via a cone shell, and the inner diameter of the cone shell gradually decreases from the outer draft tube to the shell-side cylinder.

[0007] Optionally, an arc-shaped transition section is provided at the connection between the cone shell and the outer guide cylinder, and / or at the connection between the cone shell and the shell-side cylinder.

[0008] Optionally, the guide member also includes an inner guide plate located on the inner side of the outer guide cylinder, the inner guide plate having a first side edge and a second side edge opposite to each other in the direction of the central axis of the shell cylinder, the first side edge being connected to the shell cylinder and extending along at least part of the circumferential edge of the shell cylinder, and a gap being provided between the second side edge and the reverse flange.

[0009] Optionally, the inner guide plate is constructed as a semi-cylindrical structure.

[0010] Optionally, the inner diameter of the semi-cylindrical structure is the same as the inner diameter of the shell-side cylinder.

[0011] Optionally, the outer guide tube is provided with a drain port opposite to the first inlet position.

[0012] Optionally, the first tube box includes a first tube box cylinder, a first tube box head and a fixed tube sheet, the first tube box head is connected to the side of the first tube box cylinder away from the guide member, the side of the first tube box cylinder close to the guide member is connected to the reverse flange through a first flange, and the fixed tube sheet is clamped between the first flange and the reverse flange; the second tube box includes a second tube box cylinder, a second tube box head, a hook ring, a floating tube sheet and a floating head cover, the second tube box head is connected to the side of the second tube box cylinder away from the shell cylinder, the second tube box cylinder is connected to the shell cylinder through a second flange, the floating tube sheet is located in the second tube box cylinder, the hook ring is sleeved on the outer peripheral side of the floating tube sheet and connected to the floating head cover; the heat exchange flow path includes heat exchange tubes passing through the fixed tube sheet and the floating tube sheet.

[0013] Optionally, a partition plate passing through the first tube box cylinder is provided between the first tube box head and the fixed tube sheet, the first tube box is divided into a first space connected to the second inlet and a second space connected to the second outlet by the partition plate, a third space is formed between the floating tube sheet and the floating head cover, the first space and the third space are connected as well as the second space and the third space are connected respectively through the heat exchange tubes, and the first space, the second space, the third space and the heat exchange tubes together form the heat exchange flow path.

[0014] Optionally, sealing gaskets are provided between the fixed tube sheet and the reverse flange and between the fixed tube sheet and the first flange.

[0015] Through the above technical scheme, the outer guide tube of the present invention is directly connected to the first pipe box through the reverse flange. While ensuring the stable connection between the guide member and the first pipe box, the distance between the outer guide tube and the first pipe box is reduced, so that the first heat exchange medium flowing into the shell cylinder from the first inlet through the outer guide tube is closer to the side where the first pipe box is located, thereby increasing the heat exchange area between the first heat exchange medium and the heat exchange flow path, reducing the heat exchange dead zone, and increasing the heat exchange efficiency of the heat exchanger.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0018] Figure 1 is a structural diagram of a heat exchanger provided in an embodiment of the present disclosure;

[0019] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0020] Description of Reference Numerals

[0021] 1-shell cylinder; 101-first outlet; 2-flow guide; 201-outer flow guide cylinder; 202-first inlet; 203-inner flow guide plate; 204-first side edge; 205-second side edge; 206-drain port; 3-reverse flange; 4-first pipe box; 401-second inlet; 402-second outlet; 403-first pipe box cylinder; 404-first pipe box head; 405-fixed tube sheet; 406-first flange; 5-second pipe box; 501-second pipe box cylinder; 502-second pipe box head; 503-hook ring; 504-floating tube sheet; 505-floating head cover; 506-second flange; 6-conical shell; 7-arc transition section; 8-heat exchange tube; 9-pass partition; 10-sealing gasket. DETAILED DESCRIPTION

[0022] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0023] In the present disclosure, unless otherwise specified, directional words such as "inside" and "outside" refer to "inside" and "outside" relative to the corresponding component's own outline. In addition, the terms "first", "second", etc. used in the present disclosure are to distinguish one element from another and do not have order and importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same figure numbers in different drawings represent the same or similar elements. The above definitions are only used to explain and illustrate the present disclosure and should not be understood as limitations on the present disclosure.

[0024] like Figure 1 and Figure 2As shown, the present disclosure provides a heat exchanger, comprising a shell-side cylinder 1, a flow guide 2, a first pipe box 4 and a second pipe box 5, wherein the shell-side cylinder 1 is provided with a first outlet 101 for a first heat exchange medium to flow through; the flow guide 2 comprises an outer flow guide cylinder 201, a first end of the outer flow guide cylinder 201 is connected to one end of the shell-side cylinder 1, a second end opposite to the first end is provided with a reverse flange 3, and a first inlet 202 for the first heat exchange medium to flow through is provided on the outer flow guide cylinder 201; the first pipe box 4 is connected to a side of the reverse flange 3 away from the shell-side cylinder 1, and a second inlet 401 and a second outlet 402 are provided on the first pipe box 4; the second pipe box 5 is connected to an end of the shell-side cylinder 1 away from the outer flow guide cylinder 201, and a heat exchange flow path connecting the second inlet 401 and the second outlet 402 is formed inside the heat exchanger, and the heat exchange flow path runs through the shell-side cylinder 1, so that the second heat exchange medium flowing through the heat exchange flow path can exchange heat with the first heat exchange medium. After the first heat exchange medium enters the outer guide tube 201 from the first inlet 202, it will flow into the shell cylinder 1 and finally be discharged from the first outlet 101. At the same time, the second heat exchange medium will enter the first pipe box 4 through the second inlet 401, thereby entering the heat exchange flow path that runs through the shell cylinder 1 and finally be discharged from the second outlet 402. In this process, the first heat exchange medium and the second heat exchange medium can exchange heat through the heat exchange flow path. The outer guide tube 201 is connected to the first pipe box 4 through the reverse flange 3 welded to the outer guide tube 201. On the one hand, the stability of the connection between the two can be ensured. On the other hand, compared with the related art, the position of the outer guide tube 201 will be closer to the side where the first pipe box 4 is located. That is to say, the first heat exchange medium entering the outer guide tube 201 from the first inlet 202 can also contact the part of the heat exchange flow path closer to the side where the first pipe box 4 is located, thereby increasing the heat exchange area between the first heat exchange medium and the heat exchange flow path, reducing the heat exchange dead zone of the heat exchanger, and improving the heat exchange efficiency. In addition, in the related art, the side plates and the outer cylinder constitute a rigid constraint on the shell-side cylinder, limiting the thermal expansion of the shell-side cylinder and causing large temperature difference stress. In the present disclosure, the outer guide cylinder 201 is directly connected to the first pipe box 4 via a reverse flange, which can reduce the constraint on the shell-side cylinder.

[0025] The reverse flange 3 and the outer guide tube 201 may be connected by welding, for example. In addition, the minimum distance between the first inlet 202 and the circumferential weld between the reverse flange 3 and the outer guide tube 201 may be no less than 50 mm.

[0026] In the related art, since the side plate and the outer cylinder are corner-jointed structures, assembly and welding are difficult, the stress state is very poor, and comprehensive X-ray or ultrasonic testing cannot be achieved; the side plate is an annular flat plate, which is poorly stressed and usually needs to be very thick to meet the strength requirements, resulting in increased costs; the side plate, the shell cylinder and the outer cylinder are seriously discontinuous structures, resulting in stress concentration in local areas, and failure is prone to occur under the combined action of internal pressure and external load of the pipe mouth. Based on this, in some embodiments of the present disclosure, the inner diameter of the outer guide tube 201 is larger than the inner diameter of the shell cylinder 1, and the first end of the outer guide tube 201 is connected to the shell cylinder 1 through the cone shell 6, and the inner diameter of the cone shell 6 gradually decreases from the outer guide tube 201 to the shell cylinder 1. In this way, in the present disclosure, by docking the reverse flange with the outer guide tube, processing, welding and testing are convenient, full penetration can be achieved, and manufacturing costs are reduced. The arrangement of the reverse flange, the outer guide tube and the cone shell reduces the discontinuity of the structure, improves the stress state, and is less likely to fail under the combined effect of the internal pressure and the external load of the pipe mouth.

[0027] In addition, the connection between the cone shell 6 and the outer guide tube 201, and / or the connection between the cone shell 6 and the shell side cylinder 1 is provided with an arc-shaped transition section 7. This makes the connection between the outer guide tube 201, the cone shell 6 and the shell side cylinder 1 smoother, reduces the stress generated when the two adjacent ones are connected, and ensures the stability of the connection.

[0028] The cone angle of the cone shell 6 can be set to any appropriate angle according to actual application requirements. For example, the cone angle of the cone shell 6 can be 60° to 120°.

[0029] In some embodiments, Figure 1 As shown, the guide member 2 also includes an inner guide plate 203 located on the inner side of the outer guide cylinder 201, and the inner guide plate 203 has a first side edge 204 and a second side edge 205 opposite to each other in the direction of the central axis of the shell-side cylinder 1, the first side edge 204 is connected to the shell-side cylinder 1 and extends along at least part of the circumferential edge of the shell-side cylinder 1, and there is a gap between the second side edge 205 and the reverse flange 3. After entering the outer guide tube 201, the first heat exchange medium will be blocked by the inner guide plate 203 to prevent the impact force of the first heat exchange medium from directly acting on the heat exchange flow path, thereby damaging the heat exchange flow path. When the first heat exchange medium is blocked by the inner guide plate 203, a part of the first heat exchange medium will be diverted to both sides of the circumference through the inner guide plate 203, and the other part of the first heat exchange medium will flow down from the gap between the second side edge 205 and the reverse flange 3 and contact the heat exchange flow path. Therefore, under the premise of reducing the impact of the first heat exchange medium, the heat exchange flow path close to the first pipe box 4 is also utilized, thereby improving the heat exchange efficiency of the heat exchanger.

[0030] Among them, the inner guide plate 203 can be constructed as a semi-cylindrical structure, so that a part of the first heat exchange medium can slowly flow down from the inner guide plate 203 to both sides of the circumference, reducing the impact of the first heat exchange medium on the heat exchange flow path. On the other hand, it also saves the manufacturing cost of the inner guide plate 203.

[0031] In some embodiments of the present disclosure, the inner diameter of the semi-cylindrical structure is the same as the inner diameter of the shell-side cylinder 1, so that the heat exchange flow path below the first inlet 202 is completely covered by the semi-cylindrical structure, avoiding the first heat exchange medium flowing down from both sides of the circumference of the semi-cylindrical structure from directly contacting the heat exchange flow path, thereby further reducing the impact of the first heat exchange medium on the heat exchange flow path.

[0032] Alternatively, the inner guide plate 203 may extend horizontally from the first side edge 204 to the second side edge 205 , or may extend obliquely downward from the first side edge 204 to the second side edge 205 .

[0033] In some embodiments not shown, the inner guide plate 203 may also have a variety of construction methods. For example, the inner guide plate 203 may also be a cylindrical structure, a 1 / 3 cylindrical structure, a 2 / 3 cylindrical structure, etc. In addition, the inner guide plate 203 may also be constructed only as a straight plate structure extending from the side of the outer guide tube 201 close to the second pipe box 5 to the side of the outer guide tube 201 close to the first pipe box 4. The projection of the straight plate structure in the vertical direction can cover the first inlet 202 and have a gap with the reverse flange 3 and / or the inner wall of the outer guide tube 201. The present disclosure does not limit this.

[0034] The distance between the second side edge 205 and the central axis of the first inlet 202 may be at least 50 mm greater than the inner diameter of the first inlet 202 .

[0035] In some embodiments, in order to facilitate the discharge of the first heat exchange medium remaining in the outer guide tube 201 and the shell cylinder 1, a drain port 206 opposite to the first inlet 202 can be provided on the outer guide tube 201. Similar to the first inlet 202, the distance between the drain port 206 and the circumferential weld of the reverse flange 3 and the outer guide tube 201 can also be no less than 50 mm.

[0036] For example, Figure 1 As shown, the first inlet 202 can be located at the top of the outer guide tube 201, and the drain port 206 can be located at the bottom of the outer guide tube 201; in addition, the first inlet 202 and the drain port 206 can also have other settings. For example, the first inlet 202 is located on the side of the outer guide tube 201, and the drain port 206 is located at the bottom of the outer guide tube 201. As long as the drain port 206 can achieve the effect of discharging the first heat exchange medium, the present disclosure does not limit this.

[0037] In some embodiments of the present disclosure, the first pipe box 4 includes a first pipe box cylinder 403, a first pipe box head 404 and a fixed tube sheet 405, the first pipe box head 404 is connected to the side of the first pipe box cylinder 403 away from the guide member 2, the side of the first pipe box cylinder 403 close to the guide member 2 is connected to the reverse flange 3 through the first flange 406, and the fixed tube sheet 405 is sandwiched between the first flange 406 and the reverse flange 3; the second pipe box 5 includes a second pipe box cylinder 501, a second pipe box head 502, hook ring 503, floating tube sheet 504 and floating head cover 505, the second tube box head 502 is connected to the side of the second tube box cylinder 501 away from the shell cylinder 1, the second tube box cylinder 501 is connected to the shell cylinder 1 through the second flange 506, the floating tube sheet 504 is located in the second tube box cylinder 501, the hook ring 503 is sleeved on the outer peripheral side of the floating tube sheet 504 and connected to the floating head cover 505; the heat exchange flow path includes heat exchange tubes 8 passing through the fixed tube sheet 405 and the floating tube sheet 504. After the second heat exchange medium enters the second tube box cylinder 501 through the second inlet 401, it flows into the heat exchange tube 8 and is finally discharged from the second outlet 402. Since a floating tube sheet 504 is provided in the second tube box cylinder 501, when the heat exchange tube 8 expands due to heat or contracts due to cold, the floating tube sheet 504 can float within a certain range along with the expansion or contraction of the heat exchange tube 8, thereby reducing or even avoiding the generation of temperature difference stress.

[0038] Among them, a partition plate 9 passing through the first tube box cylinder 403 is provided between the first tube box head 404 and the fixed tube sheet 405. The first tube box 4 is divided into a first space connected to the second inlet 401 and a second space connected to the second outlet 402 by the partition plate 9. A third space is formed between the floating tube sheet 504 and the floating head cover 505. The first space and the third space and the second space and the third space are respectively connected through the heat exchange tube 8. The first space, the second space, the third space and the heat exchange tube 8 together form a heat exchange flow path. After entering the first tube box cylinder 403, the second heat exchange medium will first be in the first space above the partition plate 9, and flow from the first space into the third space through part of the heat exchange tubes 8. The second heat exchange medium will turn back in the third space, flow into the second space at the bottom of the partition plate 9 through another part of the heat exchange tubes 8, and finally be discharged from the second outlet 402. This makes the second heat exchange medium have a round trip process in the shell cylinder 1, thereby extending the heat exchange time of the second heat exchange medium in the shell cylinder 1 and improving the heat exchange efficiency of the heat exchanger.

[0039] In some embodiments, a sealing gasket 10 is provided between the fixed tube sheet 405 and the reverse flange 3 and between the fixed tube sheet 405 and the first flange 406. This ensures the stability of the guide member 2 after being connected to the first tube box 4.

[0040] In summary, the working principle of the present disclosure is as follows: the first heat exchange medium first enters the interior of the outer guide tube 201 through the first inlet 202, and then the first heat exchange medium falls on the top of the inner guide plate 203. Since the outer guide tube 201 is directly connected to the first pipe box cylinder 403 through the reverse flange 3, the heat exchange dead zone on the side where the first pipe box is located can be reduced; at least part of the first heat exchange medium that falls on the top of the inner guide plate 203 will flow down from the gap between the second side edge 205 of the inner guide plate 203 and the reverse flange 3, and flow into the gap between ... The heat exchange tubes 8 on one side of the fixed tube sheet 405 are in contact with each other, thereby increasing the heat exchange area between the first heat exchange medium and the heat exchange tubes 8 and improving the heat exchange efficiency. At the same time, the second heat exchange medium in the first space of the first tube box cylinder 403 entering from the second inlet 401 will also flow to the third space in the second tube box 5 through part of the heat exchange tubes 8, and flow back to the second space in the first tube box cylinder 403 through another part of the heat exchange tubes in the third space, thereby increasing the heat exchange time of the second heat exchange medium in the shell cylinder 1 and improving the heat exchange efficiency.

[0041] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0042] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0043] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A heat exchanger, characterized in that: include: The shell-side cylinder is provided with a first outlet for the circulation of a first heat exchange medium; The flow guide comprises an outer flow guide cylinder, wherein a first end of the outer flow guide cylinder is connected to one end of the shell cylinder, a second end opposite to the first end is provided with a reverse flange, and a first inlet for the first heat exchange medium to flow is provided on the outer flow guide cylinder; A first pipe box connected to a side of the reverse flange away from the shell-side cylinder, the first pipe box being provided with a second inlet and a second outlet; as well as A second pipe box is connected to the end of the shell side cylinder away from the outer guide cylinder. A heat exchange flow path connected between the second inlet and the second outlet is formed inside the heat exchanger. The heat exchange flow path runs through the shell side cylinder so that the second heat exchange medium flowing through the heat exchange flow path can exchange heat with the first heat exchange medium.

2. The heat exchanger according to claim 1, characterized in that: The inner diameter of the outer draft tube is larger than the inner diameter of the shell cylinder. The first end of the outer draft tube is connected to the shell cylinder via a cone shell. The inner diameter of the cone shell gradually decreases from the outer draft tube to the shell cylinder.

3. The heat exchanger according to claim 2, characterized in that: An arc-shaped transition section is provided at the connection between the cone shell and the outer guide cylinder, and / or at the connection between the cone shell and the shell-side cylinder.

4. The heat exchanger according to claim 2, characterized in that: The guide member also includes an inner guide plate located on the inner side of the outer guide cylinder, the inner guide plate having a first side edge and a second side edge opposite to each other in the direction of the central axis of the shell-side cylinder, the first side edge being connected to the shell-side cylinder and extending along at least a portion of the circumferential edge of the shell-side cylinder, and a gap being provided between the second side edge and the reverse flange.

5. The heat exchanger according to claim 4, characterized in that: The inner guide plate is configured as a semi-cylindrical structure.

6. The heat exchanger according to claim 5, characterized in that The inner diameter of the semi-cylindrical structure is the same as the inner diameter of the shell-side cylinder.

7. The heat exchanger according to claim 1, characterized in that The outer guide tube is provided with a drain port opposite to the first inlet position.

8. The heat exchanger according to any one of claims 1 to 7, characterized in that: The first pipe box comprises a first pipe box cylinder, a first pipe box head and a fixed tube sheet, the first pipe box head is connected to a side of the first pipe box cylinder away from the flow guide, the side of the first pipe box cylinder close to the flow guide is connected to the reverse flange through a first flange, and the fixed tube sheet is clamped between the first flange and the reverse flange; The second tube box comprises a second tube box cylinder, a second tube box head, a hook ring, a floating tube sheet and a floating head cover, the second tube box head is connected to the side of the second tube box cylinder away from the shell side cylinder, the second tube box cylinder is connected to the shell side cylinder through a second flange, the floating tube sheet is located in the second tube box cylinder, the hook ring is sleeved on the outer peripheral side of the floating tube sheet and connected to the floating head cover; The heat exchange flow path includes heat exchange tubes penetrating the fixed tube sheet and the floating tube sheet.

9. The heat exchanger according to claim 8, characterized in that A partition plate passing through the first tube box cylinder is provided between the first tube box head and the fixed tube sheet. The first tube box is divided into a first space communicating with the second inlet and a second space communicating with the second outlet by the partition plate. A third space is formed between the floating tube sheet and the floating head cover. The first space and the third space are communicated with each other as well as the second space and the third space are communicated with each other through the heat exchange tubes. The first space, the second space, the third space and the heat exchange tubes together form the heat exchange flow path.

10. The heat exchanger according to claim 8, characterized in that Sealing gaskets are provided between the fixed tube sheet and the reverse flange and between the fixed tube sheet and the first flange.

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