CN208333230U - A kind of heat exchanger heat-exchanging tube and tube sheet connection end structure - Google Patents
A kind of heat exchanger heat-exchanging tube and tube sheet connection end structure Download PDFInfo
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- CN208333230U CN208333230U CN201820860156.0U CN201820860156U CN208333230U CN 208333230 U CN208333230 U CN 208333230U CN 201820860156 U CN201820860156 U CN 201820860156U CN 208333230 U CN208333230 U CN 208333230U
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- tube sheet
- heat exchanger
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- sheet
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Abstract
The utility model discloses a kind of heat exchanger heat-exchanging tubes and tube sheet connection end structure, tube sheet including heat exchanger shell two sides and in the heat exchanger tube being arranged between the tube sheet of two sides in shell, heat exchanger tube connection open-work is provided on the tube sheet, the annulus tube sheet boss of protrusion is provided on the inside of tube sheet around heat exchanger tube connection open-work, the outer diameter and wall thickness of the annulus tube sheet boss are corresponding with the heat exchanger tube consistent, tube sheet end face outside is provided with stainless steel corrosion-resistant coating, tube sheet boss end is connect with tube end, it is close to open-work side wall in the heat exchanger tube connection open-work on the tube sheet and is provided with bushing pipe, insertion heat exchanger tube and heat exchange pore inner sidewall welding are stretched out from annulus tube sheet boss on the inside of tube sheet in bushing pipe one end, the bushing pipe other end leans out from the stainless steel corrosion-resistant coating of tube sheet outboard end and welds with stainless steel corrosion-resistant coating end face on the outside of tube sheet.There is no gap between the utility model tube sheet and heat exchanger tube, completely eliminates the risk of crevice corrosion.
Description
Technical field
The utility model relates to high-pressure shell-type heat-exchanger, in particular to a kind of heat exchanger heat-exchanging tube and tube sheet connection end
Structure.
Background technique
High pressure heat exchanger is the important equipment in High-pressure Hydrogenation Unit, and working environment is harsh, is subjected to high temperature, height
Pressure, and bear to corrode caused by hydrogen, hydrogen sulfide etc. in operation medium.Since high pressure heat exchanger is more important on stream, and
The harm that once it, which destroy, generates is larger, it is therefore desirable to implement measures to ensure that its safety can from many aspects such as structure and materials
It leans on.Different media is contacted inside and outside the tube bank of heat exchanger respectively, needs to bear the effect of media of both sides simultaneously, heat exchanger tube with
The connecting portion of tube sheet is to be easy to generate the position destroyed in each component of tube bank.
Commonly there are two types of structure types for tube head in high pressure heat exchanger at present:
(1) structure type that tube head uses end face to weld in heat exchanger is connected between tube sheet and heat exchanger tube using fillet weld
It connects；It to eliminate the gap in exchanger tubes and tubesheets hole, while exchanging heat pipe and paste swollen, the shortcomings that this structure is:
(1) fillet weld is not easy to guarantee welding quality and is difficult to carry out ray detection or ultrasound detection, general only to carry out table
Face detection, can not find interior welds defect.
(2) axial force on heat exchanger tube forms shear action to fillet weld, and stress is bad.
(3) in the shell side side of tube sheet, even additional patch is swollen can not to completely eliminate gap between exchanger tubes and tubesheets, and
The presence in gap makes the risk where there is crevice corrosion again.Usually easily cause containing chloride ion etc. in the medium of refinery device
The ingredient of crevice corrosion, therefore the report of the tube head position corrosion failure of heat exchanger is commonplace.
(2) steam generator tube head uses the structure of internal bore welding, and the shortcomings that this structure is:
(1) although this structure from stress and it is corrosion-resistant from the aspect of all preferably, due to weld equipment limitation, at present only
In the middle pressure heat exchanger relatively thin for tube sheet；And the tube sheet general thickness of high pressure heat exchanger is more than 200mm.
(2) this structure exchanger tubes and tubesheets directly weld, and material is low-alloy steel, are not resistant in oil refining apparatus
The stronger medium of corrosivity.
Summary of the invention
The purpose of this utility model is that a kind of heat exchanger heat-exchanging tube and tube sheet connection end structure are proposed, in Tube Sheet of Heat Exchanger
There are boss, boss is docked with heat exchanger tube for the shell side side of plate, is welded equipment from the tube side side of tube sheet and is entered pore, from interior welds
Tube head does not have gap between tube sheet and heat exchanger tube, completely eliminate the risk of crevice corrosion.
To achieve the goals above, the technical solution of the utility model is: a kind of heat exchanger heat-exchanging tube and tube sheet connecting pin
Header structure, tube sheet including heat exchanger shell two sides and on the heat exchanger tube being arranged between the tube sheet of two sides in shell, the tube sheet
It is provided with heat exchanger tube connection open-work, wherein the annulus tube sheet boss of protrusion is provided on the inside of tube sheet around heat exchanger tube connection open-work,
The outer diameter and wall thickness of the annulus tube sheet boss are corresponding with the heat exchanger tube consistent, and tube sheet end face outside is provided with stainless steel anti-corrosion
Layer is lost, tube sheet boss end is connect with tube end, is close to open-work side wall in the heat exchanger tube connection open-work on the tube sheet
It is provided with bushing pipe, insertion heat exchanger tube and heat exchange pore inner sidewall welding are stretched out from annulus tube sheet boss on the inside of tube sheet in bushing pipe one end,
The bushing pipe other end leans out from the stainless steel corrosion-resistant coating of tube sheet outboard end and welds with stainless steel corrosion-resistant coating end face on the outside of tube sheet.
Scheme is further: the connection of tube sheet boss end and tube end: is connected from the tube sheet heat exchanger tube
It connects open-work and puts in the welded connecting that welding gun boss end and tube end is arranged opposite groove.
Scheme is further: stainless steel corrosion resistant transition is provided between tube sheet boss end and tube end
Layer, stainless steel corrosion resistant transition layer is to process to be formed in tube sheet boss end built-up welding, the tube end with it is described stainless
Steel corrosion resistant transition layer end is welded to connect.
Scheme is further: the welded connecting of the tube end and the stainless steel corrosion resistant transition layer end: be from
The tube sheet heat exchanger tube connection open-work puts in welding gun and the tube end and the stainless steel corrosion resistant transition layer end is arranged
The welded connecting of opposite groove.
The beneficial effects of the utility model are:
(1) there is no gap between tube sheet and heat exchanger tube, completely eliminate the risk of crevice corrosion.
(2) banjo fixing butt jointing is used between exchanger tubes and tubesheets, be easily guaranteed that welding quality and weld seam bear be pulling force or
Person's pressure, it is much better that more conventional tube head weld seam bears shearing force.
(3) tube sheet is connect by boss with heat exchanger tube, and attachment weld can carry out ray detection, can after discovery internal flaw
With repairing.
(4) by increasing transition zone between tube sheet and heat exchanger tube, can be used for tube sheet differed with heat exchanger materials performance compared with
The material that directly should not mutually weld greatly.
(5) stainless steel bushing pipe is set in the pore area of tube sheet, avoids corrosion of the tube side medium to low-alloy steel tube sheet.
The utility model is described in detail with reference to the accompanying drawings and examples.
Detailed description of the invention
The first structural schematic diagram of Fig. 1 the utility model；
Second of structural schematic diagram of Fig. 2 the utility model.
Specific embodiment
A kind of heat exchanger heat-exchanging tube and tube sheet connection end structure, basic structure is as shown in Figure 1, the heat exchanger changes
Heat pipe and tube sheet connection end structure include that the tube sheet 1(of heat exchanger shell (omission is not drawn) two sides has only drawn side) and in shell
The heat exchanger tube 2 being arranged between interior two sides tube sheet is provided with heat exchanger tube connection open-work 101 on the tube sheet, wherein side ring in tube sheet
The annulus tube sheet boss 102 of protrusion, the outer diameter and wall thickness of the annulus tube sheet boss and institute are provided with around heat exchanger tube connection open-work
It is corresponding consistent to state heat exchanger tube, tube sheet end face outside is provided with stainless steel corrosion-resistant coating 3, and tube sheet boss end and tube end connect
It connects, is close to open-work side wall in the heat exchanger tube connection open-work on the tube sheet and is provided with bushing pipe 4, bushing pipe one end circle on the inside of tube sheet
Endless tube plate boss stretches out insertion heat exchanger tube and heat exchange pore inner sidewall welding, and the length for being inserted into heat exchanger tube is unsuitable too long, can keep away
The welding point and its heat affected area of open pipe plate boss and heat exchanger tube.The bushing pipe other end is anti-from the stainless steel of tube sheet outboard end
Corrosion layer is leant out to be welded with stainless steel corrosion-resistant coating end face on the outside of tube sheet.Slight tube expansion is carried out to it after bushing pipe is in place to eliminate lining
Micro gap between pipe and pore, then the both ends of bushing pipe are sealed weldering with heat transfer tube wall and tube sheet overlay cladding respectively
It connects.
Wherein: as shown in Figure 1, the connection of tube sheet boss end and tube end: being from the tube sheet heat exchanger tube
Connection open-work puts in the welded connecting that welding gun boss end and tube end is arranged opposite groove 5.
In embodiment: to propose high performance another structure as shown in Fig. 2, in tube sheet boss end and heat exchange pipe end
Stainless steel corrosion resistant transition layer 6 is provided between portion, stainless steel corrosion resistant transition layer is to process shape in tube sheet boss end built-up welding
At the tube end and the stainless steel corrosion resistant transition layer end are welded to connect.
Wherein: the welded connecting of the tube end and the stainless steel corrosion resistant transition layer end: being from the tube sheet
Heat exchanger tube connection open-work puts in welding gun and opposite groove 7 is arranged to the tube end and the stainless steel corrosion resistant transition layer end
Welded connecting.
The present embodiment is for high pressure heat exchanger structure, and high pressure heat exchanger tube sheet is generally the low conjunction that thickness is more than 200mm
Golden steel forgings, heat exchanger tube are the corrosion resistant materials seamless steel pipes such as stainless steel or nickel-base alloy.
Attached structural implementation shown in FIG. 1 is as follows:
(1) it needs to finish, tube side tube side side (on the inside of tube sheet) and shell side side after forging forming (on the outside of tube sheet)
Built-up welding stainless steel anticorrosion layer after the finishing of side, carries out non-destructive testing after the completion of built-up welding；It is machined out after the finishing of shell side side, shape
It is the boss of circular ring shape at cross section, position, outer diameter and the wall thickness of boss are corresponding with heat exchanger tube.
(2) according to the distance at exchanger tubes and tubesheets center, all heat exchanger tubes is layered, are changed with similar in centre distance
Heat pipe divides one layer into.Being layered principle is that internal layer heat exchanger tube does not influence welding and inspection of outer layer heat exchanger tube etc..
(3) it since the boss of innermost layer, is connect with heat exchanger tube by root bead, welding uses Deep Hole Welding, pipe of the equipment from tube sheet
Journey side is protruded into butt joint inside pore and is welded.
(4) after the completion of welding, 100% ray detection is carried out to each welding point.
(5) be packed into corrosion resisting stainless steel bushing pipe from tube side side, slight tube expansion carried out to bushing pipe, tube expansion dynamics with eliminate bushing pipe with
Gap between pore (heat exchanger tube connection open-work) is principle.The connector between bushing pipe and heat exchanger is carried out inside bushing pipe close
Soldering and sealing is filled with compressed air in pipe after the completion of welding, and suds leak detection, confirmation weldering are carried out at the gap between bushing pipe and pore
The leakproofness of connector.Then weldering is sealed to the connector between bushing pipe and tube sheet overlay cladding from tube sheet tube side side, welded
At 100% Liquid penetrant testing of rear progress, the leakproofness of welding point is confirmed.
(6) after the tube head of internal layer heat exchanger tube and bushing pipe weld and detect qualification, the welding of outer layer tube head can be carried out.According to
Secondary layer-by-layer manufacture.
Attached structural implementation shown in Fig. 2 is as follows:
(1) it needs to finish tube side side and shell side side after forging forming, built-up welding stainless steel after the finishing of tube side side
Anticorrosion layer carries out non-destructive testing after the completion of built-up welding；Built-up welding transition zone after the finishing of shell side side, carries out lossless inspection after the completion of built-up welding
It surveys, the material of transition zone is determined according to the material of tube sheet and heat exchanger tube.It is machined out after shell side built-up welding, forms cross section as circle
The boss of annular, position, outer diameter and the wall thickness of boss are corresponding with heat exchanger tube.
(2) ~ (6) item is identical as 1 structure of attached drawing.Namely tube sheet should not be welded directly with heat exchanger tube, in boss and heat exchange
Increase transition zone between pipe.Unlike attached drawing 1, first in tube sheet shell side side built-up welding transition zone post-processing boss, then carried out
Cross the welding of layer and heat exchanger tube.Other manufacturing processes are identical as attached drawing 1.
Above-described embodiment uses tube head deep hole welding structure, and the gap mainly solved between tube sheet shell side side heat exchanger tube and pore is rotten
Erosion problem, while weld seam stress can be improved, it is convenient for non-destructive testing；And can be used for tube side medium and shell side medium corrode it is heavier
Occasion.
Claims (4)
1. a kind of heat exchanger heat-exchanging tube and tube sheet connection end structure, tube sheet including heat exchanger shell two sides and two in shell
The heat exchanger tube being arranged between side pipe plate is provided with heat exchanger tube connection open-work on the tube sheet, which is characterized in that surround on the inside of tube sheet
Heat exchanger tube connection open-work is provided with the annulus tube sheet boss of protrusion, the outer diameter and wall thickness of the annulus tube sheet boss and the heat exchange
Pipe is corresponding consistent, and tube sheet end face outside is provided with stainless steel corrosion-resistant coating, and tube sheet boss end is connect with tube end, in institute
It states abutting open-work side wall in the heat exchanger tube connection open-work on tube sheet and is provided with bushing pipe, bushing pipe one end is convex from annulus tube sheet on the inside of tube sheet
Platform stretches out insertion heat exchanger tube and heat exchange pore inner sidewall welding, and the bushing pipe other end is visited from the stainless steel corrosion-resistant coating of tube sheet outboard end
It is welded out with stainless steel corrosion-resistant coating end face on the outside of tube sheet.
2. heat exchanger heat-exchanging tube according to claim 1 and tube sheet connection end structure, which is characterized in that the tube sheet is convex
The connection in end portion and tube end: being to put in welding gun to boss end and heat exchanger tube from tube sheet heat exchanger tube connection open-work
The welded connecting of opposite groove is arranged in end.
3. heat exchanger heat-exchanging tube according to claim 1 and tube sheet connection end structure, which is characterized in that in the tube sheet
Stainless steel corrosion resistant transition layer is provided between boss end and tube end, stainless steel corrosion resistant transition layer is convex in the tube sheet
The built-up welding of end portion processes to be formed, and the tube end and the stainless steel corrosion resistant transition layer end are welded to connect.
4. heat exchanger heat-exchanging tube according to claim 3 and tube sheet connection end structure, which is characterized in that the heat exchanger tube
The welded connecting of end and the stainless steel corrosion resistant transition layer end: being to connect open-work from the tube sheet heat exchanger tube to put in welding gun pair
The welded connecting of opposite groove is arranged in the tube end and the stainless steel corrosion resistant transition layer end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820860156.0U CN208333230U (en) | 2018-06-05 | 2018-06-05 | A kind of heat exchanger heat-exchanging tube and tube sheet connection end structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820860156.0U CN208333230U (en) | 2018-06-05 | 2018-06-05 | A kind of heat exchanger heat-exchanging tube and tube sheet connection end structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208333230U true CN208333230U (en) | 2019-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820860156.0U Expired - Fee Related CN208333230U (en) | 2018-06-05 | 2018-06-05 | A kind of heat exchanger heat-exchanging tube and tube sheet connection end structure |
Country Status (1)
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| CN (1) | CN208333230U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111766094A (en) * | 2020-05-19 | 2020-10-13 | 巨力索具股份有限公司 | Sampling method for butt joint of round steel and pipe |
-
2018
- 2018-06-05 CN CN201820860156.0U patent/CN208333230U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111766094A (en) * | 2020-05-19 | 2020-10-13 | 巨力索具股份有限公司 | Sampling method for butt joint of round steel and pipe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190104 |