Heat exchanger with built-in header

Abstract

The utility model relates to the technical field of petrochemical equipment, in particular to a heat exchanger with a built-in header, which comprises an outer cylinder, an inner cylinder and a tube bundle, the inner cylinder is positioned in the outer cylinder, a transition space is reserved between the inner wall of the outer cylinder and the outer wall of the inner cylinder, and the outer cylinder is provided with a shell pass input tube and a shell pass output tube which are communicated with the inner cylinder; the tube bundle comprises a plurality of heat exchange tubes penetrating through the inner barrel in an arrayed mode, first-stage collecting tubes and second-stage collecting tubes, the first-stage collecting tubes and the second-stage collecting tubes are located in the transition space, the heat exchange tubes are connected with the first-stage collecting tubes, the first-stage collecting tubes are communicated with the second-stage collecting tubes, and the second-stage collecting tubes are communicated to the outside of the outer barrel. Compared with the prior art, the heat exchanger has the advantages that the first-stage collecting pipe converged by the heat exchange pipes and the second-stage collecting pipe converged by the first-stage collecting pipes are arranged in the outer barrel, so that the first-stage collecting pipes and the second-stage collecting pipes can be mounted in a manufacturing workshop in advance, and the manufacturing and monitoring cost of a use site is saved; and the problem of high construction difficulty in a severe field environment is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical equipment, and particularly relates to a heat exchanger with a header built therein. Background Art

[0002] A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid, also known as a heat exchanger.

[0003] The tube heat exchanger for producing maleic anhydride includes a shell body and multiple groups of heat exchange finned tubes inserted into the shell body. Since the overall bundle of multiple groups of heat exchange finned tubes is square, if the shell-side cylinder is made circular, there will be space left around the square heat exchange finned tube bundle, and the heat exchange efficiency of the heat exchange fluid in this space is low. Therefore, a corresponding square shell body is adopted, and the inner wall of the shell body restricts and guides the flow direction of the heat exchange fluid, so as to fully contact with the heat exchange finned tubes, make full use of the shell-side space, and improve the heat exchange efficiency.

[0004] For example, the Chinese patent document with the application number 202210277821.4 discloses a waste heat recovery boiler applicable to a maleic anhydride device, which includes an outer pressure-bearing cylinder, an inner diversion cylinder, and multiple groups of heat exchange tube groups. The outer pressure-bearing cylinder is in a cylindrical shape, and the inner diversion cylinder is inserted into the outer pressure-bearing cylinder; the heat exchange tube bundle composed of the main sections of multiple groups of heat exchange tube groups is covered by the inner diversion cylinder, and the radial cross-section of the inner diversion cylinder is a polygon adapted to the heat exchange tube bundle; compared with the prior art, starting from the original single square shell body with poor pressure-bearing capacity, aiming at the working conditions with larger pressure-bearing, the original shell body is divided into two: an outer pressure-bearing cylinder and an inner diversion cylinder. The inner wall of the inner diversion cylinder restricts and guides the flow direction of the heat exchange fluid, so as to fully contact with the heat exchange tube groups, make full use of the shell-side space, and improve the heat exchange efficiency. The circular outer pressure-bearing cylinder mainly bears the fluid pressure, achieving both the diversion effect of the polygonal cylinder and the pressure-bearing in the form of a circle, with the advantages of strong pressure-bearing capacity and good diversion effect.

[0005] In the prior art, the manifold header of the heat exchange tube group is installed outside the outer cylinder. Due to road restrictions, the manifold header and the corresponding outer reinforcing ring need to be transported to the site in loose parts and welded to the equipment on site. Welding production of pressure-bearing components on site requires quality inspection and supervision, which increases the costs of on-site installation project management, safety training, travel expenses, etc.; moreover, the harsh on-site environment increases the difficulty of welding work. Summary of the Invention

[0006] In view of the above technical problems in the prior art, the utility model provides a heat exchanger with a header built therein.

[0007] To achieve the above object, the utility model provides the following technical solutions:

[0008] Provided is a heat exchanger with a built-in header, comprising an outer cylinder, an inner cylinder and a tube bundle. The inner cylinder is located within the outer cylinder, and a transition space is left between the inner wall of the outer cylinder and the outer wall of the inner cylinder. The outer cylinder is provided with a shell-side inlet pipe and a shell-side outlet pipe communicating with the inner cylinder. It is characterized in that: the tube bundle includes multiple heat exchange tubes arranged to pass through the inner cylinder, and a first-stage header and a second-stage header located in the transition space. The multiple heat exchange tubes are connected to the multiple first-stage headers, the multiple first-stage headers are communicated with the second-stage header, and the second-stage header is communicated outside the outer cylinder.

[0009] As a further optional solution, the multiple heat exchange tubes are vertically arranged. The first-stage header includes a first-stage upper header located above the inner cylinder and communicating with the upper ends of the heat exchange tubes, and a first-stage lower header located below the inner cylinder and communicating with the lower ends of the heat exchange tubes.

[0010] As a further optional solution, the second-stage header includes a second-stage upper header located above the inner cylinder and communicating with each first-stage upper header, and a second-stage lower header located below the inner cylinder and communicating with each first-stage lower header.

[0011] As a further optional solution, every two or more rows of heat exchange tubes are connected to the same first-stage upper header and first-stage lower header, and the multiple first-stage upper headers and the multiple first-stage lower headers are arranged in parallel.

[0012] As a further optional solution, each first-stage upper header is simultaneously communicated with two or more second-stage upper headers, and each first-stage lower header is simultaneously communicated with two or more second-stage lower headers.

[0013] As a further optional solution, the first-stage upper header and the second-stage upper header are communicated via a flexible elbow.

[0014] As a further optional solution, a collecting pipe is further provided below the inner cylinder. The multiple second-stage lower headers are all communicated with the collecting pipe, and the collecting pipe is communicated with an extension pipe, and the extension pipe is connected to the upper part of the outer cylinder.

[0015] As a further optional solution, the heat exchange tubes include a first tube group and a second tube group distributed along the axial direction of the outer cylinder. The second tube group and the extension pipe connected to the second tube group are collected to the same pipe orifice to penetrate out of the outer cylinder. The inner cylinder segments corresponding to the first tube group and the second tube group are polygonal, and the outer cylinder is a cylindrical body.

[0016] As a further optional solution, the extension pipe is fixed to the side wall of the outer cylinder via a flexible elbow.

[0017] As a further optional solution, an inner support structure is fixed to the inner wall of the outer cylinder, and the tube bundle and the inner support structure are fixedly connected to each other.

[0018] Advantages of the present utility model:

[0019] A header - built heat exchanger of the present utility model, compared with the prior art, has the primary header where multiple heat exchange tubes converge and the secondary header where multiple primary headers converge both built inside the outer cylinder. Therefore, the primary header and the secondary header can be pre - installed in the manufacturing workshop before being transported to the use site, saving the manufacturing inspection cost at the use site and avoiding the problem of high construction difficulty in the harsh environment at the use site. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a perspective view of a header - built heat exchanger in the embodiment.

[0021] Figure 2 FIG. is a schematic structural view of a header - built heat exchanger in the embodiment with a partial outer cylinder hidden.

[0022] Figure 3 For Figure 2 the enlarged view of the circled position in

[0023] Figure 4 FIG. is a schematic structural view of the tube bundle in the embodiment.

[0024] Figure 5 FIG. is a cross - sectional view of a header - built heat exchanger in the embodiment.

[0025] Figure 6 FIG. is a cross - sectional view of another section of a header - built heat exchanger in the embodiment.

[0026] REFERENCE MARKS:

[0027] Outer cylinder 1, inner cylinder 2, shell - side input pipe 3, shell - side output pipe 4, tube bundle 5, heat exchange tube 51;

[0028] Primary header 52, primary upper header 521, primary lower header 522;

[0029] Secondary header 53, secondary upper header 531, secondary lower header 532;

[0030] Flexible elbow 6, confluence pipe 7, internal support structure 8, extension pipe 9. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model 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.

[0032] A header - built heat exchanger in this embodiment, as Figures 1 to 6As shown in the figure, it includes an outer cylinder 1, an inner cylinder 2 and a tube bundle 5. The outer cylinder 1 is in the shape of a horizontally placed cylinder, and both ends are provided with heads. A shell-side inlet pipe 3 and a shell-side outlet pipe 4 are provided at the heads. The inner cylinder 2 is located in the outer cylinder 1, and a transition space is left between the inner wall of the outer cylinder 1 and the outer wall of the inner cylinder 2. Both ends of the inner cylinder 2 are connected to the shell-side inlet pipe 3 and the shell-side outlet pipe 4. Actually, according to needs, the inner cylinder 2 can be connected to the transition space.

[0033] The tube bundle 5 includes a plurality of heat exchange tubes 51 vertically arranged and passing through the inner cylinder 2, and a first-stage manifold 52 and a second-stage manifold 53 located in the transition space. The plurality of heat exchange tubes 51 are connected to the plurality of first-stage manifolds 52, the plurality of first-stage manifolds 52 are communicated with the second-stage manifold 53, and the second-stage manifold 53 is communicated outside the outer cylinder 1.

[0034] Specifically, the plurality of heat exchange tubes 51 are longitudinally arranged. The first-stage manifold 52 includes a first-stage upper manifold 521 located above the inner cylinder 2 and communicating with the upper ends of the heat exchange tubes 51, and a first-stage lower manifold 522 located below the inner cylinder 2 and communicating with the lower ends of the heat exchange tubes 51. The second-stage manifold 53 includes a second-stage upper manifold 531 located above the inner cylinder 2 and communicating with each first-stage upper manifold 521, and a second-stage lower manifold 532 located below the inner cylinder 2 and communicating with each first-stage lower manifold 522. Compared with the prior art, both the first-stage manifold 52 where the plurality of heat exchange tubes 51 converge and the second-stage manifold 53 where the plurality of first-stage manifolds 52 converge are built inside the outer cylinder 1, reducing the overall height of the equipment. Therefore, the first-stage manifold 52 and the second-stage manifold 53 can be pre-assembled and welded in the manufacturing workshop before being transported to the use site, avoiding the problem of quality inspection for welding of pressure-bearing components on site, saving the manufacturing inspection cost at the use site, avoiding the problem of high construction difficulty in the harsh environment at the use site, and also avoiding the welding quality risk that may be caused by welding Cr-Mo steel in the harsh environment on site.

[0035] In this embodiment, every three rows of heat exchange tubes 51 are connected to the same first-stage upper manifold 521 and the same first-stage lower manifold 522, and the plurality of first-stage upper manifolds 521 and the plurality of first-stage lower manifolds 522 are arranged in parallel. Each first-stage upper manifold 521 is simultaneously communicated with two second-stage upper manifolds 531, and each first-stage lower manifold 522 is simultaneously communicated with four second-stage lower manifolds 532. The number of the second-stage upper manifolds 531 and the second-stage lower manifolds 532 can be adjusted according to actual needs. The plurality of first-stage upper manifolds 521 and the plurality of first-stage lower manifolds 522 are arranged in parallel with each other, the first-stage upper manifold 521 and the second-stage upper manifold 531 are arranged perpendicularly, and the first-stage lower manifold 522 and the second-stage lower manifold 532 are arranged perpendicularly to each other.

[0036] In this embodiment, the primary upper header 521 and the secondary upper header 531 are connected via a flexible elbow 6. The flexible elbow 6 can be a flexible arc-shaped pipe or a flexible coiled pipe. The traditional expansion joint is cancelled, and a flexible pipe structure is adopted to absorb the thermal expansion of the tube bundle 5.

[0037] In this embodiment, a confluence pipe 7 is further provided below the inner cylinder 2. A plurality of secondary lower headers 532 are all connected to the confluence pipe 7. The confluence pipe 7 is connected with an extension pipe 9. The extension pipe 9 is connected to the upper part of the outer cylinder 1 at a position inclined upward by about 45°. Similarly, the extension pipe 9 is fixed to the side wall of the outer cylinder 1 via a flexible elbow 6.

[0038] In this embodiment, the heat exchange tubes 51 include a first tube group and a second tube group distributed along the axis of the outer cylinder 1. The second tube group and the extension pipe 9 connected thereto converge to the same pipe orifice and penetrate out of the outer cylinder 1. The corresponding segments of the inner cylinder 2 of the first tube group and the second tube group are polygonal.

[0039] In this embodiment, an inner support structure 8 is fixed to the inner wall of the outer cylinder 1. The tube bundle 5 and the inner support structure 8 are fixedly connected to each other, and are optimized into an inner reinforcing ring to reduce the workload of welding the reinforcing ring on site.

[0040] In the description of the present invention, obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the above detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention claimed, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inside", "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 when in use. It is only for the convenience of describing the present invention 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 cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "arranged", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection. It may be a mechanical connection or an electrical connection. It may be directly connected or indirectly connected through an intermediate medium, and may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model may be understood according to specific circumstances.

Claims

1. A heat exchanger with internal headers, comprising an outer cylinder (1), an inner cylinder (2) and a tube bundle (5), wherein the inner cylinder (2) is located in the outer cylinder (1), and a transition space is left between the inner wall of the outer cylinder (1) and the outer wall of the inner cylinder (2), and the outer cylinder (1) is provided with a shell-side inlet pipe (3) and a shell-side outlet pipe (4) communicating with the inner cylinder (2); wherein: The tube bundle (5) comprises a plurality of heat exchange tubes (51) arranged to pass through the inner cylinder (2), and a primary collecting tube (52) and a secondary collecting tube (53) located in a transition space; the plurality of heat exchange tubes (51) are connected to the plurality of primary collecting tubes (52); the plurality of primary collecting tubes (52) are connected to the secondary collecting tube (53); and the secondary collecting tube (53) is connected to the outside of the outer cylinder (1).

2. The heat exchanger with built-in header according to claim 1, characterized in that: A plurality of heat exchange tubes (51) are arranged longitudinally, and a first-level header (52) comprises a first-level upper header (521) located above the inner cylinder (2) and connected to the upper end of the heat exchange tube (51), and a first-level lower header (522) located below the inner cylinder (2) and connected to the lower end of the heat exchange tube (51).

3. The heat exchanger with built-in header according to claim 2, characterized in that: The secondary header (53) comprises a secondary upper header (531) located above the inner cylinder (2) and connected to each of the primary upper headers (521), and a secondary lower header (532) located below the inner cylinder (2) and connected to each of the primary lower headers (522).

4. The heat exchanger with built-in header according to claim 3, characterized in that: Every two or more rows of heat exchange tubes (51) are connected to the same first-level upper header (521) and first-level lower header (522), and a plurality of first-level upper headers (521) and a plurality of first-level lower headers (522) are arranged in parallel.

5. The heat exchanger with built-in header according to claim 4, characterized in that: Each first-level upper header (521) is connected to more than two second-level upper headers (531) at the same time, and each first-level lower header (522) is connected to more than two second-level lower headers (532) at the same time.

6. The heat exchanger with built-in header according to claim 3, characterized in that: The primary upper header (521) and the secondary upper header (531) are connected via a flexible elbow (6).

7. The heat exchanger with built-in headers according to claim 3, characterized in that: A conduit (7) is also provided below the inner cylinder (2), and a plurality of secondary lower collecting pipes (532) are all connected to the conduit (7), and the conduit (7) is connected to an extension pipe (9), and the extension pipe (9) is connected to the upper part of the outer cylinder (1).

8. The heat exchanger with built-in headers according to claim 7, characterized in that: The heat exchange tube (51) comprises a first tube group and a second tube group distributed along the axial direction of the outer cylinder (1); the extension tubes (9) connected to the second tube group and the second tube group are mutually collected to the same tube opening and pass through the outer cylinder (1); the inner cylinder (2) segments corresponding to the first tube group and the second tube group are polygonal, and the outer cylinder (1) is a cylindrical body.

9. The heat exchanger with built-in headers according to claim 7, characterized in that: The extension tube (9) is fixed to the side wall of the outer cylinder (1) via a flexible curved tube (6).

10. The heat exchanger with built-in headers according to claim 1, characterized in that: An inner support structure (8) is fixed on the inner wall of the outer cylinder (1), and the tube bundle (5) and the inner support structure (8) are fixedly connected to each other.

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