CN220728993U - Hairpin heat exchanger for large medium-pressure secondary superheater - Google Patents
Hairpin heat exchanger for large medium-pressure secondary superheater Download PDFInfo
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- CN220728993U CN220728993U CN202322415033.XU CN202322415033U CN220728993U CN 220728993 U CN220728993 U CN 220728993U CN 202322415033 U CN202322415033 U CN 202322415033U CN 220728993 U CN220728993 U CN 220728993U
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- 238000003466 welding Methods 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
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Abstract
The utility model relates to the technical field of heat exchangers, in particular to a hairpin heat exchanger for a large medium-pressure secondary superheater, which comprises two straight-section cylinders arranged in parallel and an elbow connecting the two straight-section cylinders in series, so as to form a U-shaped heat exchange shell, wherein a heat exchange tube bundle is arranged in the heat exchange shell, the end part of the straight-section cylinder, which is far away from the elbow, is provided with a tube plate, the tube plate is provided with a seal head, the end part of the heat exchange tube bundle is fixed on the tube plate and communicated with the seal head, the seal head is provided with a tube pass inlet and outlet, and the position of the straight-section cylinder, which is close to the seal head, is provided with a shell pass inlet and outlet, and is characterized in that: the inner wall of the straight section cylinder body is provided with a guide cylinder corresponding to the shell side inlet and outlet, and the outer wall of the guide cylinder and the inner wall of the straight section cylinder body enclose an annular guide space. Compared with the prior art, the medium flowing in from the shell side inlet and outlet flows to the heat exchange tube bundle after flushing the guide cylinder, so that vibration caused by direct impact on the heat exchange tube bundle is avoided. And the guide cylinder is arranged in the straight section cylinder, so that the whole structure is compact and stable.
Description
Technical Field
The utility model relates to the technical field of heat exchangers, in particular to a hairpin heat exchanger for a large medium-pressure secondary superheater.
Background
The working process of the existing medium-pressure steam preparation system mainly comprises the following steps: 1. the water fed from the medium-pressure heat supply water supply pump enters a high-temperature secondary preheater and a medium-pressure secondary preheater respectively, is heated by main steam condensate of a high-temperature reactor and the main steam condensate and then is sent to the high-temperature evaporator and the medium-pressure evaporator to prepare saturated steam, the saturated steam is converged and then sequentially enters a first-stage superheater and a second-stage superheater, the saturated steam is superheated by utilizing the main steam of the high-temperature gas cooled reactor, is heated to 53MPa.a, enters a medium-pressure steam collecting and distributing box after being heated to the temperature of 482 ℃, and is sent to an outside-plant steam pipeline. 2. And part of the main steam of the high-temperature gas cooled reactor enters a first-stage superheater to be condensed into supercooled water after passing through a second-stage superheater, and the supercooled water is condensed into supercooled water after passing through the high-temperature second-stage preheater and then is converged with supercooled water at the outlet of the first-stage superheater, and enters a public system. 3. The main steam is condensed into saturated water after passing through a medium-pressure evaporator, and enters a public system after being cooled by a medium-pressure secondary preheater.
The medium-pressure secondary superheater has the main functions of: from the technical aspect, the method has the main effects of further heating the superheated steam from the primary superheater, increasing the temperature to the required superheated steam temperature, and ensuring that the superheated steam has enough superheat degree to enter the steam turbine for acting. During variable operating conditions, it is ensured that the superheated steam temperature is intended to vary within safe limits.
The hairpin heat exchanger is one of the commonly used heat exchangers, and the medium flow of the hairpin heat exchanger is mainly as follows: after the high-temperature medium at the inlet of the shell pass enters the shell, the high-temperature medium exchanges heat with the medium in the heat exchange tube, the medium is discharged out of the heat exchanger through the outlet of the shell pass, and after the medium at the relatively low temperature enters the equipment tube bundle, the medium exchanges heat with the medium at the higher temperature of the shell pass and is discharged out of the heat exchanger. Compared with the traditional shell-and-tube heat exchanger, the hairpin heat exchanger has the characteristics of better heat exchange performance and compact structure.
The Chinese patent document with the publication number of CN202793096U discloses a hairpin heat exchanger which comprises a U-shaped heat exchange tube, a distance tube, a baffle plate, a first tube plate, a second tube plate and a U-shaped heat exchanger shell, wherein the U-shaped heat exchanger shell mainly comprises a shell A section, a shell B section and a shell C section, the shell A section and the shell B section form two arms of the U-shaped heat exchanger shell, and the shell C section is a bending section of the U-shaped heat exchanger shell; one end of the shell C section is welded with the shell A section, and the other end is welded with the shell B section; the U-shaped heat exchange tube is integrally nested in the U-shaped heat exchanger shell, one end of the U-shaped heat exchange tube is connected with the first tube plate in an expanded mode or welded, the other end of the U-shaped heat exchange tube is connected with the second tube plate in an expanded mode or welded, and the baffle plate is fixed on the distance tube. The structure enables the heat exchanger shell to be freely telescopic under the operation of thermal stress, simultaneously enlarges the heat transfer space of the shell side medium and the tube side medium, and prolongs the heat exchange time.
Another example is that chinese patent publication No. CN213984740U discloses a spacing support device for a horizontal hairpin heat exchanger, a fixed support is disposed at one tube plate end of the hairpin heat exchanger, a sliding support allowing axial displacement of the tube plate is disposed at the other tube plate end, two rolling supports separated from each other are disposed at the U-shaped shell end of the hairpin heat exchanger, the fixed support, the sliding support and the rolling support are saddle-shaped supports, a bottom plate mounting hole of the fixed support is a circular hole, a bottom plate mounting hole of the sliding support is an axial oblong hole, a pair of rollers disposed left and right are disposed at the bottom of the rolling support, each roller is correspondingly supported by the limiting device and is mounted in a groove of the limiting device, and the groove is disposed in the axial direction of the heat exchanger. Therefore, the front side and the rear side of the same end of the heat exchanger can both allow and adapt to axial displacement, so that axial swing is avoided, radial swing is limited, and the stability and the safety of equipment are improved.
The Chinese patent literature with the publication number of CN215864775U discloses a hairpin type efficient heat exchanger, which relates to the technical field of heat exchangers and comprises a shell A section, wherein a shell side outlet is penetrated through the surface of the shell A section, one end of the shell A section is provided with a shell side flange plate, the other end of the shell A section is provided with a first tube plate, one side of the first tube plate is provided with a tube side inlet, the outer side of the shell A section is sleeved with a sliding support plate, and one side of the sliding support plate is provided with a small support plate; the shell B section is arranged on one side of the shell A section, a shell side inlet is formed in the surface of the shell B section in a penetrating mode, and a second tube plate is arranged at one end of the shell B section. This kind of hairpin formula high-efficient heat exchanger sets up the rubber circle through casing C section and shell side ring flange junction, lets the connection between the casing become flexonics, can vibration isolation, noise reduction to can prevent that displacement from damaging the pipeline and adjusting installation error, can also reduce the destruction of thermal stress to the heat exchanger casing.
As can be seen from the above, the hairpin heat exchanger disclosed in each prior art has a basic structure in which a heat exchange tube bundle is disposed in a U-shaped housing, and a shell side inlet and a shell side outlet are disposed in the housing. However, as the hairpin type scale adopted by petrochemical industry is larger and larger, the flow rate of high-temperature medium flowing in from the shell side inlet is larger, larger impact force exists on the heat exchange tube bundle, and vibration is easy to generate when the heat exchange tube bundle is directly flushed.
Disclosure of Invention
Aiming at the technical problems in the prior art, the utility model provides a hairpin heat exchanger for a large medium-pressure secondary superheater.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
the utility model provides a hairpin heat exchanger for large-scale middling pressure second grade superheater, including two straight section barrels that arrange side by side and the elbow of establishing ties two straight section barrels to form the heat exchange shell of U-shaped, be equipped with heat exchange tube bank in the heat exchange shell, the tip that keeps away from the elbow of straight section barrel is provided with the tube sheet, the tube sheet is provided with the head, heat exchange tube bank's tip is fixed in the tube sheet and communicates the head, the head is provided with the tube side access & exit, the position that is close to the head of straight section barrel is provided with shell side access & exit, characterized by: the inner wall of the straight section cylinder body is provided with a guide cylinder corresponding to the shell side inlet and outlet, and the outer wall of the guide cylinder and the inner wall of the straight section cylinder body enclose an annular guide space.
As a further alternative, the straight barrel includes a shell body section and an enlarged diameter section of increased inner diameter near the closure head, and the end of the guide barrel is fixed to the shell body section and extends to the enlarged diameter section.
As a further alternative, the shell wall between the shell body section and the expanded section is arranged obliquely.
As a further alternative, the end of the guide shell is welded to the inner wall of the shell body section.
As a further alternative, the inner wall of the guide shell is flush with the inner wall of the shell body section.
As a further alternative, a plurality of baffle plates are arranged in the heat exchange shell, the heat exchange tube bundle passes through the baffle plates, the baffle plates are distributed in the shell body section and the guide cylinder, and/or a plurality of shockproof support plates are arranged in the elbow, and the heat exchange tube bundle passes through the shockproof support plates.
As a further alternative, the shell body section and the expanded diameter section are integrally formed with each other or are welded to each other.
As a further alternative, the tube side ports are arranged obliquely to the axial direction of the straight barrel.
As a further alternative, the heat exchange tube bundle is a plurality of tubes in a U-shape.
As a further alternative, a support seat is provided between the two straight cylinders.
The utility model has the beneficial effects that:
compared with the prior art, the hairpin heat exchanger for the large medium-pressure secondary superheater has the advantages that the guide cylinder is arranged on the inner wall of the straight section cylinder, and media flowing in from the inlet and outlet of the shell pass flow to the heat exchange tube bundle after flushing the guide cylinder, so that vibration caused by direct impact on the heat exchange tube bundle is avoided. And the guide cylinder is arranged in the straight section cylinder, so that the whole structure is compact and stable.
Drawings
Fig. 1 is a schematic structural view of a hairpin heat exchanger for a large-sized medium-pressure secondary superheater in an embodiment.
Fig. 2 is an enlarged partial schematic view of fig. 1.
Reference numerals:
the shell comprises a straight section cylinder body 1, a shell body section 11, an expanding section 12, a transition section 13, a diversion space 14, a shell pass inlet and outlet 15, an elbow 2, a heat exchange tube bundle 3, a tube plate 4, a seal head 5, a tube pass inlet and outlet 51, a guide cylinder 6, a baffle plate 7, a shockproof support plate 8 and a support seat 9.
Detailed Description
The present utility model will be described in detail with reference to specific embodiments and drawings.
The hairpin heat exchanger for a large-scale medium-pressure secondary superheater of the embodiment comprises two straight section cylinders 1 which are arranged in parallel and an elbow 2 which connects the two straight section cylinders 1 in series, so that a U-shaped heat exchange shell is formed together, a heat exchange tube bundle 3 is arranged in the heat exchange shell, and the heat exchange tube bundle 3 is a plurality of U-shaped tube bodies. The elbow 2 is a 180-degree bent cylinder body, and the cylinder diameter of the elbow is matched with that of the straight cylinder body 1 so as to be mutually butted and fixed. The end of the straight section cylinder body 1 far away from the elbow 2 is provided with a tube plate 4, the tube plate 4 is provided with a hemispherical seal head 5, the end of the heat exchange tube bundle 3 is welded and fixed on the tube plate 4 and communicated with the seal head 5, the two seal heads 5 are respectively provided with a tube side inlet and outlet 51, one of the two seal heads is used as a tube side inlet, the other is used as a tube side outlet during use, and a tube side flow channel such as the tube side inlet, the seal head 5, the heat exchange tube bundle 3, the other seal head 5 and the tube side outlet is formed. The positions of the two straight section cylinders 1, which are close to the sealing heads 5, are respectively provided with a shell side inlet and a shell side outlet 15, and when the two straight section cylinders are used in the same way, one of the two straight section cylinders is used as a shell side outlet, and the other straight section cylinder 1 is provided with a shell side inlet, so that a shell side runner, namely the shell side inlet, one straight section cylinder 1, the elbow 2, and the other straight section cylinder 1, is formed. The medium in the tube-side flow channels and the shell-side flow channels exchange heat via the tube walls of the heat exchange tube bundle 3. The main improvement is as follows:
in this embodiment, a guide cylinder 6 is disposed at a position corresponding to the shell side inlet and outlet 15 on the inner wall of the straight section cylinder 1, and an annular guide space 14 is defined by the outer wall of the guide cylinder 6 and the inner wall of the straight section cylinder 1. Specifically, the straight section cylinder 1 includes a shell body section 11 and an enlarged diameter section 12 with an increased inner diameter near the end socket 5, and a transition section 13 with a tilted shell wall is arranged between the shell body section 11 and the enlarged diameter section 12, so that a space is reserved for forming a diversion space 14. The end of the guide shell 6 is fixed to the shell body section 11 and extends to the enlarged diameter section 12. The medium entering from the shell pass inlet and outlet 15 directly impacts the guide cylinder 6, then moves towards the tube plate 4, and reversely enters the shell pass to contact the heat exchange tube bundle 3, so that vibration caused by directly impacting the heat exchange tube bundle 3 is avoided. And the guide cylinder 6 is arranged in the straight section cylinder 1, so that the whole structure is compact and stable.
The end of the specific guide cylinder 6 is welded with the inner wall of the shell body section 11, so that the manufacture is convenient. The inner wall of the guide cylinder 6 is level with the inner wall of the shell body section 11, so that the smoothness of medium flow is enhanced, and corner flushing is avoided. The shell body section 11 and the expanded diameter section 12 are of an integral structure or of a welded structure.
In this embodiment, a plurality of baffle plates 7 are disposed in the heat exchange shell, the heat exchange tube bundle 3 passes through the plurality of baffle plates 7, and the plurality of baffle plates 7 are distributed in the shell body section 11 and the guide cylinder 6, and are used for baffling the medium flowing in the shell pass, so as to enhance the heat exchange effect. The elbow 2 is provided with a plurality of shockproof support plates 8, and the heat exchange tube bundle 3 passes through the shockproof support plates 8, so that the shell side medium is prevented from turning to cause the shock of the heat exchange tube bundle 3.
In this embodiment, the tube side inlet and outlet 51 is arranged obliquely with respect to the axial direction of the straight section cylinder 1, and compared with the tube side inlet and outlet 51 aligned with the axial direction of the straight section cylinder 1, the distance between the tube side inlet and outlet 51 and most of tube heads is prolonged, and the area for directly flushing the tube plate 4 in a short distance is reduced.
In this embodiment, a supporting seat 9 is disposed between two straight cylinders 1, wherein one group of supporting seats 9 is close to the shell side inlet and outlet 15, and the other group of supporting seats 9 is close to the elbow 2.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Standard parts used in the utility model can be purchased from the market, special-shaped parts can be customized according to the description of the specification and the drawings, the specific connection modes of all parts adopt conventional means such as mature bolts, rivets and welding in the prior art, the machinery, the parts and the equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection modes in the prior art, so that the details are not described.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the scope of the present utility model, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model.
Claims (10)
1. A hairpin heat exchanger for large-scale middling pressure second grade superheater, including two straight section barrels that arrange side by side and the elbow of establishing ties two straight section barrels to form the heat exchange shell of U-shaped, be equipped with heat exchange tube bank in the heat exchange shell, the tip of keeping away from the elbow of straight section barrel is provided with the tube sheet, and the tube sheet is provided with the head, and heat exchange tube bank's tip is fixed in the tube sheet and communicates the head, and the head is provided with the tube side access & exit, and the position that is close to the head of straight section barrel is provided with shell side access & exit, characterized by: the inner wall of the straight section cylinder body is provided with a guide cylinder corresponding to the shell side inlet and outlet, and the outer wall of the guide cylinder and the inner wall of the straight section cylinder body enclose an annular guide space.
2. The hairpin heat exchanger for a large medium pressure secondary superheater of claim 1 wherein: the straight section cylinder body comprises a shell body section and an expanding section with an increased inner diameter, wherein the expanding section is close to the end socket, and the end part of the guide cylinder is fixed on the shell body section and extends to the expanding section.
3. The hairpin heat exchanger for a large medium pressure secondary superheater of claim 2 wherein: the shell wall between the shell body section and the expanding section is arranged in an inclined way.
4. The hairpin heat exchanger for a large medium pressure secondary superheater of claim 2 wherein: the end of the guide cylinder is welded with the inner wall of the shell body section.
5. The hairpin heat exchanger for a large medium pressure secondary superheater of claim 2 wherein: the inner wall of the guide cylinder is level with the inner wall of the shell body section.
6. The hairpin heat exchanger for a large medium pressure secondary superheater of claim 2 wherein: a plurality of baffle plates are arranged in the heat exchange shell, the heat exchange tube bundle passes through the baffle plates, the baffle plates are distributed in the shell body section and the guide cylinder, and/or a plurality of shockproof support plates are arranged in the elbow, and the heat exchange tube bundle passes through the shockproof support plates.
7. The hairpin heat exchanger for a large medium pressure secondary superheater of claim 2 wherein: the shell body section and the expanding section are of an integral forming structure or a welding structure.
8. The hairpin heat exchanger for a large medium pressure secondary superheater of claim 1 wherein: the tube side inlet and outlet are arranged obliquely relative to the axial direction of the straight section cylinder body.
9. The hairpin heat exchanger for a large medium pressure secondary superheater of claim 1 wherein: the heat exchange tube bundle is a plurality of U-shaped tube bodies.
10. The hairpin heat exchanger for a large medium pressure secondary superheater of claim 1 wherein: a supporting seat is arranged between the two straight section cylinders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322415033.XU CN220728993U (en) | 2023-09-06 | 2023-09-06 | Hairpin heat exchanger for large medium-pressure secondary superheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322415033.XU CN220728993U (en) | 2023-09-06 | 2023-09-06 | Hairpin heat exchanger for large medium-pressure secondary superheater |
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| Publication Number | Publication Date |
|---|---|
| CN220728993U true CN220728993U (en) | 2024-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322415033.XU Active CN220728993U (en) | 2023-09-06 | 2023-09-06 | Hairpin heat exchanger for large medium-pressure secondary superheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220728993U (en) |
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2023
- 2023-09-06 CN CN202322415033.XU patent/CN220728993U/en active Active
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