CN112923759A - Vertical heat exchanger - Google Patents

Vertical heat exchanger Download PDF

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Publication number
CN112923759A
CN112923759A CN201911240377.3A CN201911240377A CN112923759A CN 112923759 A CN112923759 A CN 112923759A CN 201911240377 A CN201911240377 A CN 201911240377A CN 112923759 A CN112923759 A CN 112923759A
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CN
China
Prior art keywords
tube
shell
pass
heat exchanger
box
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911240377.3A
Other languages
Chinese (zh)
Inventor
周进
贾滨阳
马林玉
周文贵
武秀丽
郝春雷
冯二威
余晓忠
白亮
李永旺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SYNEFUELS CHINA Inc
Original Assignee
SYNEFUELS CHINA Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SYNEFUELS CHINA Inc filed Critical SYNEFUELS CHINA Inc
Priority to CN201911240377.3A priority Critical patent/CN112923759A/en
Publication of CN112923759A publication Critical patent/CN112923759A/en
Pending legal-status Critical Current

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Abstract

A vertical heat exchanger comprises a shell pass and a lower tube box arranged below the shell pass, wherein a shell pass inlet and a shell pass outlet are formed in the side wall of the shell pass, a tube pass outlet is formed in the bottom of the lower tube box, an upper tube box is arranged in an inner cavity of the shell pass, a heat exchange tube, a single-arch baffle plate and a supporting plate are arranged between the upper tube box and the lower tube box, and the heat exchange tube is communicated with the upper tube box and the lower tube box; the top of the upper pipe box is provided with an expansion joint assembly, and the top of the expansion joint assembly is provided with a pipe pass inlet. The expansion joint assembly which is usually arranged on the shell side of the vertical heat exchanger is arranged on the inlet side of the tube side, so that the diameter of the required expansion joint assembly is reduced, the design and manufacturing difficulty of the expansion joint is greatly reduced, the manufacturing cost is lower, and the shell side flange is sealed by the welding ring sealing gasket, is not easy to leak, and is safer and more reliable.

Description

Vertical heat exchanger
Technical Field
The invention relates to a vertical heat exchanger, and belongs to the technical field of heat exchanger manufacturing.
Background
The heat exchanger is an important process device for transferring heat among materials and realizing heat recovery and comprehensive utilization. Along with the rapid development of economy, the investment of China in the construction of projects such as large-scale oil refining, large-scale coal chemical industry and large-scale ethylene is increased, and the scale of the projects is increased. With the increasing size and high parameters of industrial equipment, the demand for large heat exchangers is becoming more urgent.
For a large heat exchanger comprising a large-diameter long heat exchange tube, even if the temperature difference of a metal wall is small, the expansion amount difference between tube shell sides of the large heat exchanger is large, and in order to absorb the expansion amount difference of the tube shell sides, the heat exchanger in the prior art is provided with an expansion joint in an inner cavity of the tube shell side, so that the problem of expansion difference caused by the temperature difference between the heat exchange tube and a shell is solved. When the structure is applied to a large-scale heat exchanger, the defects exist in the production process: because equipment diameter is great, a pair of equipment flange that shell side barrel set up all very difficult during design, manufacturing, the price is not very good, has certain risk of revealing moreover in the use.
Disclosure of Invention
The invention aims to solve the technical problem that in order to overcome the defects of the prior art, the invention provides the vertical heat exchanger, the expansion joint assembly which is usually arranged on the shell side is arranged on the inlet side of the tube side, so that the diameter of the required expansion joint assembly is reduced, the design and manufacturing difficulty of the expansion joint is greatly reduced, the manufacturing cost is lower, and the shell side flange is sealed by the welding ring sealing gasket, so that the leakage is not easy to occur, and the vertical heat exchanger is safer and more reliable.
The technical problem to be solved by the invention is realized by the following technical scheme:
a vertical heat exchanger comprises a shell pass and a lower tube box arranged below the shell pass, wherein a shell pass inlet and a shell pass outlet are formed in the side wall of the shell pass, a tube pass outlet is formed in the bottom of the lower tube box, an upper tube box is arranged in an inner cavity of the shell pass, a heat exchange tube, a single-arch baffle plate and a supporting plate are arranged between the upper tube box and the lower tube box, and the heat exchange tube is communicated with the upper tube box and the lower tube box; the top of the upper pipe box is provided with an expansion joint assembly, and the top of the expansion joint assembly is provided with a pipe pass inlet.
Preferably, a lower tube plate is arranged between the shell side and the lower tube box, the bottom of the lower tube plate is welded with the top of the lower tube box, and the top of the lower tube plate is welded with the bottom of the shell side; an upper tube plate is arranged in an inner cavity of the shell pass, and the top of the upper tube plate is connected with the bottom of the upper tube box in a welding mode.
In order to support the heat exchange tube to reduce vibration of the heat exchange tube due to fluid flow, the heat exchange tube penetrates the lower tube sheet, the single-arch baffle, the backup plate, and the upper tube sheet.
Preferably, the expansion joint assembly is detachably connected with the upper pipe box; the top of shell side is equipped with the shell side flange, the bottom of tube side import is equipped with tube side import flange, the top of tube side import flange with tube side import welded connection, the bottom of tube side import flange with expansion joint subassembly top welded connection.
In order to ensure that the medium in the shell pass inner cavity does not leak, and the expansion joint assembly can be disassembled and assembled when needed, the tube pass inlet flange and the shell pass flange are also provided with two welding ring sealing gaskets, one welding ring sealing gasket is welded with the shell pass flange, the other welding ring sealing gasket is welded with the tube pass inlet flange, and the two welding ring sealing gaskets are welded with each other.
In order to enable the upper tube box and the connected components to freely move up and down in the inner cavity of the shell side, internal stress caused by expansion difference between the tube side and the shell side is transmitted to the expansion joint component, and meanwhile, the support function is achieved, vibration caused by medium fluid flowing is reduced, a plurality of positioning blocks are arranged on the side wall of the upper end of the upper tube box and face the side wall of the shell side, the positioning blocks are evenly arranged along the circumference by taking the central axis of the vertical heat exchanger as an axis, and gaps are arranged between the positioning blocks and the shell side.
Preferably, the shell side inlet is arranged on the side wall of the lower end of the shell side and is positioned between the lower tube plate and the single-arch baffle plate at the lowest part, and the shell side outlet is arranged on the side wall of the upper end of the shell side and is positioned between the upper tube plate and the single-arch baffle plate at the highest part.
In order to discharge the liquid and gas in the shell pass inner cavity when needed, the vertical heat exchanger is also provided with an air outlet and a liquid outlet which are connected with the shell pass inner cavity, and the air outlet is arranged at the top of the shell pass; the liquid discharge port is arranged on the side surface of the lower tube plate and penetrates through the upper end surface of the lower tube plate.
In order to conveniently inspect and maintain the vertical heat exchanger when needed, the side wall of the upper end of the shell pass is provided with a shell pass manhole; the top of the upper pipe box is provided with an inspection hole; and the side wall of the lower pipe box is provided with a lower pipe box manhole.
In conclusion, the expansion joint assembly which is usually arranged on the shell side of the vertical heat exchanger is arranged on the inlet side of the tube side, so that the diameter of the required expansion joint assembly is reduced, the design and manufacturing difficulty of the expansion joint is greatly reduced, the manufacturing cost is lower, and the shell side flange is sealed by the welding ring sealing gasket, so that the leakage is difficult, and the vertical heat exchanger is safer and more reliable; the shell side flange and the tube side inlet flange are in sealed connection by selecting the welding ring sealing gasket, so that the shell side medium leakage condition is avoided, and the expansion joint assembly can be replaced and disassembled by grinding the welding line between the two welding ring sealing gaskets when necessary; the arrangement of the manhole of the lower pipe box, the manhole of the shell pass and the inspection hole is convenient for the internal inspection of the lower pipe box and the upper pipe box and the external inspection of the interior of the shell pass and the exterior of the upper pipe box when necessary, and the disassembly and assembly of the interior of the expansion joint component are facilitated; the positioning blocks and the shell pass are arranged at intervals, so that all components in an inner cavity of the shell pass can freely move up and down, the expansion quantity difference between the shell passes is transmitted to the expansion joint component to be absorbed, the supporting effect is achieved, and meanwhile, the vibration caused by the flowing of medium fluid is reduced.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic view of a vertical heat exchanger according to the present invention;
fig. 2 is a partially enlarged view of a portion a in fig. 1.
Detailed Description
FIG. 1 is a schematic view of a vertical heat exchanger according to the present invention; fig. 2 is a partially enlarged view of a portion a in fig. 1. As shown in fig. 1 and 2, the present invention provides a vertical heat exchanger suitable for use in a large heat exchange area, such as heat exchange of different media in large oil refinery, large coal chemical industry, and large ethylene projects, the vertical heat exchanger comprising a shell side 3 and a lower header 1 disposed below the shell side 3.
A lower tube plate 2 is arranged between the shell pass 3 and the lower tube box 1, preferably, the bottom of the lower tube plate 2 is welded with the top of the lower tube box 1, and the top of the lower tube plate 2 is welded with the bottom of the shell pass 3. The bottom of the lower tube box 1 is provided with a tube pass outlet 11.
An upper tube plate 7 and an upper tube box 8 are arranged in the inner cavity of the shell pass 3, and the top of the upper tube plate 7 is connected with the bottom of the upper tube box 8 in a welding mode.
And a heat exchange tube 4, a single-arch baffle plate 5 and a supporting plate 6 are arranged between the upper tube box 8 and the lower tube box 1. The heat exchange tube 4 communicates the upper tube box 8 with the lower tube box 1, so that a tube side medium enters from a tube side inlet 84, flows through the expansion joint assembly 83, the upper tube box 8, the heat exchange tube 4 and the lower tube box 1, and then flows out from a tube side outlet 11.
Specifically, the heat exchange tube 4 penetrates through the lower tube plate 2, the single-arch baffle plate 5, the supporting plate 6 and the upper tube plate 7, the upper end of the heat exchange tube 4 is connected with the upper tube plate 7 in a welding mode, and the lower end of the heat exchange tube 4 is connected with the lower tube plate 2 in a welding mode. The plurality of single-arch baffles 5 can increase the turbulence degree of the fluid and improve the heat transfer coefficient of the fluid, and the single-arch baffles 5 and the supporting plates 6 each have the function of supporting the heat exchange tubes 4, thereby reducing the vibration of the heat exchange tubes 4 due to the flow of the fluid.
The top of the upper tube box 8 is provided with an expansion joint component 83, the expansion joint component 83 is used for absorbing internal stress caused by expansion difference between tube shell sides, and preferably, in order to facilitate maintenance of the expansion joint component 83, the expansion joint component 83 is detachably connected with the upper tube box 8, for example, through bolts, flanges and the like. The invention is not limited to the type and construction of the expansion joint assembly 83, and may be, for example, a built-in differential pressure expansion joint designed as a thick or thin wall expansion joint, a multiple wave expansion joint, or the like.
The side wall of the upper end of the upper tube box 8 is provided with a plurality of positioning blocks 81 facing the side wall of the shell pass, the positioning blocks 81 are uniformly arranged along the circumference by taking the central axis of the vertical heat exchanger as an axis, a gap is arranged between the positioning blocks 81 and the shell pass 3, namely the positioning blocks 81 and the shell pass 3 are arranged at intervals, so that the upper tube box 8 and the connected parts can freely move up and down in the inner cavity of the shell pass 3, the internal stress caused by the expansion difference between the tube passes is transmitted to the expansion joint component 83, the supporting function is achieved, the vibration caused by the flow of the medium fluid is reduced, and the size of the gap can be selected by designers according to actual conditions.
The top of the expansion joint assembly 83 is provided with a tube side inlet 84. Specifically, the top of the shell pass 3 is provided with a shell pass flange 35, the bottom of the tube pass inlet 84 is provided with a tube pass inlet flange 841, the top of the tube pass inlet flange 841 is welded to the tube pass inlet 84, and the bottom of the tube pass inlet flange 841 is welded to the top of the expansion joint component 83.
Further, in order to conveniently maintain and simultaneously strengthen the sealing performance of the pipe pass inlet flange 841, two welding ring sealing gaskets 9 are arranged between the shell pass flange 35, one welding ring sealing gasket 9 is connected with the shell pass flange 35 in a welding manner, the other welding ring sealing gasket is connected with the pipe pass inlet flange 841 in a welding manner, and the welding ring sealing gaskets 9 are connected in a welding manner. The medium in the inner cavity of the shell pass 3 is ensured not to leak through the arrangement, two welding seams between the welding ring sealing gaskets 9 can be ground off when needed, and the expansion joint assembly can be disassembled and assembled through the shell pass flange.
And the side wall of the shell side 3 is also provided with a shell side inlet 31 and a shell side outlet 32. In order to optimize the medium flow in shell side 3, shell side inlet 31 is provided in the lower end side wall of shell side 3 between lower tube sheet 2 and the lowermost single-arch baffle, and shell side outlet 32 is provided in the upper end side wall of shell side 3 between upper tube sheet 7 and the uppermost single-arch baffle.
The vertical heat exchanger is also provided with an exhaust port 34 and a liquid outlet 21 which are connected with the inner cavity of the shell pass 3, wherein the exhaust port 34 is used for exhausting gas in the inner cavity of the shell pass 3 when needed, and the liquid outlet 21 is used for exhausting liquid in the inner cavity of the shell pass when needed. Specifically, the exhaust port 34 is arranged at the top of the shell side 3; the liquid discharge port 21 is provided on the side surface of the lower tube plate 2 and penetrates the upper end surface of the lower tube plate 2.
In addition, a shell pass manhole 33 is arranged on the side wall of the upper end of the shell pass 3, so that the internal condition of the shell pass 3 and the external condition of the upper tube box 8 can be conveniently checked when needed; the top of the upper tube box 8 is provided with an inspection hole 82 so as to facilitate the temporary inspection of the internal condition of the upper tube box 8, and the side wall of the lower tube box 1 is provided with a manhole 12 so as to facilitate the inspection of the internal condition of the lower tube box 1 when needed.
The above exemplary vertical heat exchanger of the present invention may be used according to the exemplary procedure as follows:
shell-side media enters shell-side 3 from shell-side inlet 31 and continues to flow along the guide channels formed by the plurality of single-segmental baffles 5, and during the flow, the fluid passes through the channels formed by the plurality of heat exchange tubes 4 until exiting from shell-side outlet 32.
The tube pass medium enters from the tube pass inlet 84, passes through the tube pass inlet flange 841 and the expansion joint component 83, enters the upper tube box 8, then enters the lower tube box 1 through the heat exchange tube 4, and then flows out through the tube pass outlet 11.
When the vertical heat exchanger works, the shell side medium and the tube side medium flow simultaneously, when the shell side medium and the tube side medium flow through the heat exchange tube 4, heat exchange is carried out through the tube wall of the heat exchange tube 4, the heat medium loses part of heat, and the cold medium obtains part of heat, so that the heat transfer process is completed.
The shell pass medium and the tube pass medium are subjected to heat transfer through the tube wall of the heat exchange tube 4, and a part of heat is transferred to the shell pass 3, so that the shell pass 3 expands, the heat exchange tube 4 also expands in the heat transfer process of the two mediums of the tube pass, and due to the difference of tube pass materials and temperatures, the expansion amount of the shell pass 3 is different from that of the heat exchange tube 4, the expansion amount difference between the tube passes is transferred through the heat exchange tube 4, the upper tube plate 7 and the upper tube box 8 and is finally absorbed by the expansion joint component 83, the internal stress of each component of the tube pass is reduced, and the safe and reliable operation of the whole equipment is ensured.
In conclusion, the expansion joint assembly which is usually arranged on the shell side of the vertical heat exchanger is arranged on the inlet side of the tube side, so that the diameter of the required expansion joint assembly is reduced, the design and manufacturing difficulty of the expansion joint is greatly reduced, the manufacturing cost is lower, and the shell side flange is sealed by the welding ring sealing gasket, so that the leakage is difficult, and the vertical heat exchanger is safer and more reliable; the shell side flange and the tube side inlet flange are in sealed connection by selecting the welding ring sealing gasket, so that the shell side medium leakage condition is avoided, and the expansion joint assembly can be replaced and disassembled by grinding the welding line between the two welding ring sealing gaskets when necessary; the arrangement of the manhole of the lower pipe box, the manhole of the shell pass and the inspection hole is convenient for the internal inspection of the lower pipe box and the upper pipe box and the external inspection of the interior of the shell pass and the exterior of the upper pipe box when necessary, and the disassembly and assembly of the interior of the expansion joint component are facilitated; the positioning blocks and the shell pass are arranged at intervals, so that all components in an inner cavity of the shell pass can freely move up and down, the expansion quantity difference between the shell passes is transmitted to the expansion joint component to be absorbed, the supporting effect is achieved, and meanwhile, the vibration caused by the flowing of medium fluid is reduced.
The above exemplary embodiments are not described in detail, and the methods and structures are not part of the common general knowledge in the industry and are not all described here. The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, and these simple modifications all belong to the protection scope of the invention.

Claims (9)

1. A vertical heat exchanger comprises a shell pass and a lower tube box arranged below the shell pass, wherein a shell pass inlet and a shell pass outlet are formed in the side wall of the shell pass, and a tube pass outlet is formed in the bottom of the lower tube box; the top of the upper pipe box is provided with an expansion joint assembly, the top of the expansion joint assembly is provided with a pipe pass inlet, and the upper pipe box is communicated with the pipe pass inlet through the expansion joint assembly.
2. The vertical heat exchanger according to claim 1, wherein a lower tube plate is arranged between the shell side and a lower tube box, the bottom of the lower tube plate is welded with the top of the lower tube box, and the top of the lower tube plate is welded with the bottom of the shell side; an upper tube plate is arranged in an inner cavity of the shell pass, and the top of the upper tube plate is connected with the bottom of the upper tube box in a welding mode.
3. The vertical heat exchanger of claim 1 wherein the heat exchange tubes extend through the lower tube sheet, the single-arch baffle, the backing plate, and the upper tube sheet.
4. The vertical heat exchanger according to claim 1, wherein the expansion joint assembly is detachably connected to the upper header; the top of shell side is equipped with the shell side flange, the bottom of tube side import is equipped with tube side import flange, the top of tube side import flange with tube side import welded connection, the bottom of tube side import flange with expansion joint subassembly top welded connection.
5. The vertical heat exchanger according to claim 4, wherein two welding ring gaskets are further arranged between the tube side inlet flange and the shell side flange, one welding ring gasket is welded with the shell side flange, the other welding ring gasket is welded with the tube side inlet flange, and the two welding ring gaskets are welded with each other.
6. The vertical heat exchanger as claimed in claim 1, wherein the upper end side wall of the upper header is provided with a plurality of positioning blocks facing the shell side wall, the plurality of positioning blocks are uniformly arranged along a circumference around a central axis of the vertical heat exchanger, and a gap is provided between the positioning blocks and the shell side.
7. The vertical heat exchanger of claim 2 wherein the shell side inlet is located in the lower end side wall of the shell side between the lower tube sheet and the lowermost single-arch baffle, and the shell side outlet is located in the upper end side wall of the shell side between the upper tube sheet and the uppermost single-arch baffle.
8. The vertical heat exchanger of claim 2, further comprising an exhaust port and a liquid outlet connected to the inner chamber of the shell side, wherein the exhaust port is disposed at the top of the shell side; the liquid discharge port is arranged on the side surface of the lower tube plate and penetrates through the upper end surface of the lower tube plate.
9. The vertical heat exchanger of claim 1, wherein the upper end side wall of the shell side is provided with a shell side manhole; the top of the upper pipe box is provided with an inspection hole; and the side wall of the lower pipe box is provided with a lower pipe box manhole.
CN201911240377.3A 2019-12-06 2019-12-06 Vertical heat exchanger Pending CN112923759A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911240377.3A CN112923759A (en) 2019-12-06 2019-12-06 Vertical heat exchanger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911240377.3A CN112923759A (en) 2019-12-06 2019-12-06 Vertical heat exchanger

Publications (1)

Publication Number Publication Date
CN112923759A true CN112923759A (en) 2021-06-08

Family

ID=76161491

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911240377.3A Pending CN112923759A (en) 2019-12-06 2019-12-06 Vertical heat exchanger

Country Status (1)

Country Link
CN (1) CN112923759A (en)

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