CN103148734A - Connection structure between heat exchange pipe and pipe plate for preventing clearance corrosion of shell pass side - Google Patents
Connection structure between heat exchange pipe and pipe plate for preventing clearance corrosion of shell pass side Download PDFInfo
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- CN103148734A CN103148734A CN2013101074008A CN201310107400A CN103148734A CN 103148734 A CN103148734 A CN 103148734A CN 2013101074008 A CN2013101074008 A CN 2013101074008A CN 201310107400 A CN201310107400 A CN 201310107400A CN 103148734 A CN103148734 A CN 103148734A
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Abstract
The invention discloses a connection structure between a heat exchange pipe and a pipe plate for preventing the clearance corrosion of a shell pass side. The connection structure between the heat exchange pipe and the pipe plate for preventing the clearance corrosion of the shell pass side comprises the pipe plate and the heat exchange pipe, wherein a pipe hole is formed in the pipe plate; the pipe plate comprises a pipe plate body; one side of the pipe plate body is a pipe pass side; the other side of the pipe plate body is the shell pass side; the pipe plate also comprises a two-way composite layer, consisting of a first composite layer preinstalled on the shell pass side of the pipe plate body and a second composite layer preinstalled on the inner wall of the pipe hole; and the heat exchange pipe penetrates through the two-way composite layer, and further is fixedly connected with the pipe plate in a sealing way. With the adoption of the connection structure between the heat exchange pipe and the pipe plate for preventing the clearance corrosion of the shell pass side, a rational structure is arranged on the shell pass side of the pipe plate to prevent a corrosive medium from permeating into clearance between the pipe plate and the heat exchange pipe, so that the purpose of preventing the clearance corrosion is realized; and therefore, the corrosion resistance performance of a tube bundle of a tubular heat exchanger can be improved better, the service life of equipment is prolonged and the structure is simple and reliable.
Description
Technical field
The application relates to field of heat exchange equipment in air-conditioning, Coal Chemical Industry, petroleum chemical industry, particularly a kind of heat exchanger tube and tube sheet syndeton of preventing the corrosion of shell side side clearance.
Background technology
So-called crevice corrosion is that those fluids easily corrode at immobilising dead angle, and crevice corrosion is a kind of form of local corrosion, and it may betide among the gap that solution stagnates or in the surface of shielding.Such gap can be in metal and metal or metal and the formation of nonmetallic joint.In chemical industry equipment is made, should avoid the existence at gap as above or dead angle as far as possible, perhaps take measures plugging gap and dead angle produce with the situation of avoiding crevice corrosion.
In prior art, heat exchanger tube is divided into the connection of tube sheet the form that expanded joint, welding and expanded and welded tube joint are combined.In the production of oil, chemical industry, expanded and welded tube joint is in conjunction with usually being used.Reason due to structure, the tube side side of heat exchanger easily realizes sealing by expanded joint and welding, and the more difficult realization sealing of shell side side, normally undertaken by expanded joint, but still there is the gap in the swollen mode of common subsides between heat exchanger tube and tube sheet, the shell side medium can immerse among the gap, accumulates corrosion tube sheet pore inwall, easily cause tube head to come off, this affects especially obvious in large-scale clad tubesheet.
The quality of connection of heat exchanger tube and tube sheet is one of most important sign that determines the heat exchanger quality, and the shell-and-tube heat exchanger main failure forms is the Joint failure of tube sheet and heat exchanger.The heavy heat exchanger high for pressure, that diameter large, tube bank is long, in case occur leaking, will be even more serious to the direct or indirect loss of its generation, therefore, the type of attachment of heat exchanger tube and tube sheet is the key technology of heat exchanger.
Therefore, in order to prevent that the shell side medium from entering in tube sheet by the expanded joint gap between heat exchanger tube and tubesheet holes, the corrosion tube sheet, improve for above-mentioned problems of the prior art, research and develop a kind of connectivity scenario of suitable heat exchanger tube and tube sheet and structure of adopting and seem particularly important with the technology that effectively prevents crevice corrosion.
Summary of the invention
The application's purpose is to avoid above-mentioned weak point of the prior art and a kind of crevice corrosion that effectively prevents is provided, heat exchanger tube and the tube sheet syndeton of the prevention shell side side clearance corrosion in extension device service life.
The application's purpose is achieved through the following technical solutions:
A kind of heat exchanger tube and tube sheet syndeton of preventing the corrosion of shell side side clearance is provided, include tube sheet and heat exchanger tube, described tube sheet is provided with pore, described tube sheet includes the tube sheet body, one side of described tube sheet body is the tube side side, the opposite side of described tube sheet body is the shell side side, wherein, described tube sheet also includes by the first composite bed of the shell side side that defaults in described tube sheet body and defaults in the two-way composite bed that the second composite bed of the inwall of described pore forms, described heat exchanger tube wear described two-way composite bed and with described tube sheet fixed seal connection.
Wherein, all surfaces of the inwall of described pore or local surfaces are provided with the second composite bed, and described heat exchanger tube wears described two-way composite bed and with described tube plate expanded-connecting and/or be welded to connect.
Wherein, the second composite bed of the local surfaces setting of the inwall of described pore is positioned near described shell side side one section.
Wherein, the side that described the second composite bed is positioned at described tube sheet body is provided with external screw thread, and described tube sheet body is provided with the internal thread that is connected with described external screw thread, described heat exchanger tube wear described two-way composite bed and with described tube sheet fixed seal connection.
Wherein, the end that described the second composite bed is positioned at described shell side side protrudes described the first composite bed setting, and the external tapping of described the second composite bed and described the first composite bed is tightly connected.Described the second composite bed is positioned at described tube sheet body and the first composite bed one section can be provided with external screw thread, can be provided with the internal thread that is connected with described external screw thread in described tube sheet body and the first composite bed, described heat exchanger tube wear described two-way composite bed and with described tube sheet fixed seal connection.
Wherein, described the second composite bed is thin layer melting welding layer, and described heat exchanger tube is by electric resistance welding and described tube sheet fixed seal connection.
Wherein, described heat exchanger tube wears described two-way composite bed and tightens with described tube sheet by described pore and is closely connected.
Wherein, the thickness of described the second composite bed equates to arrange.
Wherein, the varied in thickness setting of described the second composite bed.
Wherein, described two-way composite bed be with in utmost point composite bed, manual electric arc welding composite bed, multilayer explosive welding (EW) composite bed, coating, pressure welding layer, overlay cladding and spray-welding coating any or appoint several combinations.
The application's beneficial effect:
A kind of heat exchanger tube and tube sheet syndeton of preventing the corrosion of shell side side clearance of the application, include tube sheet and heat exchanger tube, described tube sheet is provided with pore, described tube sheet includes the tube sheet body, one side of described tube sheet body is the tube side side, the opposite side of described tube sheet body is the shell side side, wherein, described tube sheet also includes by the first composite bed of the shell side side that defaults in described tube sheet body and defaults in the two-way composite bed that the second composite bed of the inwall of described pore forms, described heat exchanger tube wear described two-way composite bed and with described tube sheet fixed seal connection.
Compared with prior art, the application is by the two-way composite construction in pore, having avoided on the one hand the pore end is the heavy wall composite bed built-up welding of tube sheet shell side side, saved cost, in pore, the second darker composite bed has extended the corrosion protection path on the other hand, selected more rational new construction in the shell side side of tube sheet generally, can more effectively prevent corrosive medium penetrate between tube sheet and heat exchanger tube without the composite bed place, reach the purpose that prevents crevice corrosion.Can improve better the decay resistance of tubular heat exchanger tube bank, the service life of extension device, also have simultaneously simple in structure, the characteristics that cost is low, easy to manufacture.
Description of drawings
Utilize accompanying drawing that the application is described further, but the embodiment in accompanying drawing does not consist of any restriction to the application, for those of ordinary skill in the art, under the prerequisite of not paying creative work, can also obtain according to the following drawings other accompanying drawing.
Fig. 1 is the structural representation that the application a kind of prevents the embodiment 1 of the heat exchanger tube of shell side side clearance corrosion and tube sheet syndeton.
Fig. 2 is the structural representation that the application a kind of prevents the embodiment 2 of the heat exchanger tube of shell side side clearance corrosion and tube sheet syndeton.
Fig. 3 is the structural representation that the application a kind of prevents the embodiment 3 of the heat exchanger tube of shell side side clearance corrosion and tube sheet syndeton.
Fig. 4 is the structural representation that the application a kind of prevents the embodiment 4 of the heat exchanger tube of shell side side clearance corrosion and tube sheet syndeton.
Fig. 5 is the structural representation that the application a kind of prevents the embodiment 5 of the heat exchanger tube of shell side side clearance corrosion and tube sheet syndeton.
Fig. 6 is the structural representation that the application a kind of prevents the embodiment 6 of the heat exchanger tube of shell side side clearance corrosion and tube sheet syndeton.
Include in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6:
1---tube sheet body, 2---the first composite bed, 3---the second composite bed, 4---heat exchanger tube, 5---seal-weld,
A---tube side side, B---shell side side.
The specific embodiment
With the following Examples the application is further described.
a kind of one of the heat exchanger tube of shell side side clearance corrosion and specific embodiment of tube sheet syndeton of preventing of the application, include tube sheet and heat exchanger tube 4, described tube sheet is provided with pore, described tube sheet includes tube sheet body 1, one side of described tube sheet body 1 is tube side side A, the opposite side of described tube sheet body 1 is shell side side B, wherein, described tube sheet also includes by the first composite bed 2 of the shell side side B that defaults in described tube sheet body 1 and defaults in the two-way composite bed that the second composite bed 3 of the inwall (along pore radially) of described pore forms, described heat exchanger tube 4 wears described two-way composite bed, and with described tube sheet fixed seal connection.
Concrete, the local surfaces of the inwall of described pore is provided with the second composite bed 3, and described heat exchanger tube 4 wears described two-way composite bed and with described tube plate expanded-connecting and/or be welded to connect.According to actual conditions, can select mechanical expanding or Hydraulic expansion-jointing during expand tube, and determine relevant parameter for the variation of caliber, tubing, aperture, Kong Cai etc. through overtesting.
Concrete, the second composite bed 3 of the local surfaces setting of the inwall of described pore is positioned at a section near described shell side side B.Can determine the second composite bed 3 length of necessary part by field trial or numerical simulation calculation, avoid the second long composite bed 3 length, keep maximum tube sheet basal body structure intensity, the antiseptic effect that satisfies basic demand is arranged.
Heat exchanger tube 4 pierces into pore from shell side side B, and the tube head end of heat exchanger tube 4 is connected by seal-weld 5 at tube sheet tube side side A with pore, pierces between the pore of one section heat exchanger tube 4 of pore and tube sheet and has been eliminated the gap by swelling.On with the tube sheet of the second composite bed 3 after boring, then one section caliber of shell side side B pore is enlarged, compound upper the second composite bed 3, the fine finishining pore can be organized and exchange heat pipe 4 again.
Concrete, the thickness of described the second composite bed 3 equates to arrange, and also can change setting.Equal thickness structure, manufacturing process are relatively simple; The Varying-thickness structure can satisfy special construction needs manufacturing process relative complex.For example, brute force is compressed into one section conical pipe after shell side side B pore is expanded into bell, be adjacent to composite holes.The second composite bed 3 of the inwall of pore shown in Figure 1 is to wait wall thickness, if meet the second composite bed 3 after shell side side B pore is expanded into bell, perhaps brute force is compressed into one section conical pipe again, be adjacent to the composite holes of equal thickness the second composite bed 3 not.
The application selects rational structure at the shell side side B of tube sheet and the inwall of pore, prevents that corrosive medium from infiltrating between tube sheet and heat exchanger tube 4, reaches the purpose that prevents crevice corrosion.Compared with prior art, after the application uses, can improve better the decay resistance of tubular heat exchanger tube bank, the service life of extension device.Comparatively speaking, this hole structure is slightly complicated, and manufacturing cost is high, causes the threat of safety in production to compare but be corroded with whole heat transmission equipment, still has obvious technological and economical advantages.
Concrete, described two-way composite bed be with in utmost point composite bed, manual electric arc welding composite bed, multilayer explosive welding (EW) composite bed, coating, pressure welding layer, overlay cladding and spray-welding coating any or appoint several combinations.Can also be that powerful compression is compound.
A kind of heat exchanger tube of shell side side clearance corrosion and specific embodiment two of tube sheet syndeton of preventing, the main technical schemes of the present embodiment is identical with embodiment 1, unaccounted feature, adopt the explanation in embodiment 1 in the present embodiment, no longer gives unnecessary details at this.With reference to shown in Figure 2, the difference of the present embodiment and embodiment 1 is, all surfaces of the inwall of described pore is provided with the second composite bed 3.Best antiseptic effect is arranged, but the intensity of tube sheet body 1 is weakened to some extent.
A kind of heat exchanger tube of shell side side clearance corrosion and specific embodiment three of tube sheet syndeton of preventing, the main technical schemes of the present embodiment is identical with embodiment 1, unaccounted feature, adopt the explanation in embodiment 1 in the present embodiment, no longer gives unnecessary details at this.With reference to shown in Figure 3, the difference of the present embodiment and embodiment 1 is, the side that described the second composite bed 3 is positioned at described tube sheet body 1 is provided with external screw thread, described tube sheet body 1 is provided with the internal thread that is connected with described external screw thread, described heat exchanger tube 4 wear described two-way composite bed and with described tube sheet fixed seal connection.
Be threaded connection between the second composite bed 3 of the part of the inwall of pore and pore.First in pore after compound the second composite bed 3, then at shell side side B, the seal weld of threaded engagement face can be prevented from forming new corrosion gap.
After the second composite bed 3 pipeline section external screw threads and pore internal thread are tightened, then to this pipeline section expanded joint, pore end welding, can avoid the operating difficulties of melting in pore, the secondary drilling processing that also can save postwelding in the hole.The second composite bed 3 pipeline section external screw threads and pore internal thread comprise straight thread or taper thread, and the latter's sealing effectiveness is better.Simpler composite bed is to manage then swelling by be lining into one section in pore.
Embodiment 4
A kind of heat exchanger tube of shell side side clearance corrosion and specific embodiment four of tube sheet syndeton of preventing, the main technical schemes of the present embodiment is identical with embodiment 1, unaccounted feature, adopt the explanation in embodiment 1 in the present embodiment, no longer gives unnecessary details at this.With reference to shown in Figure 4, the difference of the present embodiment and embodiment 1 is, wherein, the second composite bed 3 is thin layer melting welding layer, and described heat exchanger tube 4 is by electric resistance welding and described tube sheet fixed seal connection.
Be not only that expanded joint is connected between the inwall of pore and tube sheet datum hole, but form thin layer melting welding layer, the effect that plays intensity and be tightly connected by the electric resistance welding between in expanded joint.Because the first composite bed 2 of shell side side B is identical or close with the material of heat exchanger tube 4, the resistance-welding process of this segment can obtain key design optimization, obtains best sealing effectiveness.In order to obtain comprehensive effect, the size of pore is wanted accurately, and phase face of weld impurity and oxide skin will be removed totally.As the case may be, the weld seam 5 of tube head end can be cancelled.
A kind of heat exchanger tube of shell side side clearance corrosion and specific embodiment five of tube sheet syndeton of preventing, the main technical schemes of the present embodiment is identical with embodiment 1, unaccounted feature, adopt the explanation in embodiment 1 in the present embodiment, no longer gives unnecessary details at this.With reference to shown in Figure 5, the difference of the present embodiment and embodiment 1 is, heat exchanger tube 4 wears described two-way composite bed, and pore tightens and heat exchanger tube 4 tight seals.Be not that expanded joint is connected between the inwall of pore and tube sheet datum hole, but pore is heated or open under other loads, heat exchanger tube 4 is pushed in pore, and pore is replied distortion and held heat exchanger tube 4 tightly, reaches close-fitting requirement.This structure is applicable to that heat exchanger tube 4 footpaths are large, length of tube is shorter, can powerfully promote the occasion that pipe end pierces into pore.
Embodiment 6
A kind of heat exchanger tube of shell side side clearance corrosion and specific embodiment six of tube sheet syndeton of preventing, the main technical schemes of the present embodiment is identical with embodiment 1, unaccounted feature, adopt the explanation in embodiment 1 in the present embodiment, no longer gives unnecessary details at this.With reference to shown in Figure 6, the difference of the present embodiment and embodiment 1 is, the end that described the second composite bed 3 is positioned at described shell side side B protrudes the first composite bed 2 settings, and described the second composite bed 3 is connected by seal-weld 5 with the external tapping of described the first composite bed 2.Described the second composite bed 3 is positioned at described tube sheet body 1 and the first composite bed 2 one section can be provided with external screw thread, can be provided with the internal thread that is connected with described external screw thread in described tube sheet body 1 and the first composite bed 2, described heat exchanger tube 4 wear described two-way composite bed and with described tube sheet fixed seal connection.The expanded joint length of heat exchanger tube 4 and pore directly extends to complete section of the second composite bed 3; namely protrude one section of the first composite bed 2 also expanded joint; protected the expanded joint effect of 2 sections of tube sheet body 1 and the first composite beds, reached and closely cooperate and the effect in extension device life-span.
Should be noted that at last; above embodiment is only in order to illustrate the application's technical scheme; but not to the restriction of the application's protection domain; although with reference to preferred embodiment, the application has been done to explain; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the application's technical scheme, and not break away from essence and the scope of present techniques scheme.
Claims (10)
1. heat exchanger tube and tube sheet syndeton of preventing shell side side clearance corrosion, include tube sheet and heat exchanger tube, described tube sheet is provided with pore, described tube sheet includes the tube sheet body, one side of described tube sheet body is the tube side side, the opposite side of described tube sheet body is the shell side side, it is characterized in that: described tube sheet also includes by the first composite bed of the shell side side that defaults in described tube sheet body and defaults in the two-way composite bed that the second composite bed of the inwall of described pore forms, described heat exchanger tube wear described two-way composite bed and with described tube sheet fixed seal connection.
2. a kind of heat exchanger tube and tube sheet syndeton of preventing shell side side clearance corrosion according to claim 1, it is characterized in that: all surfaces of the inwall of described pore or local surfaces are provided with the second composite bed, and described heat exchanger tube wears described two-way composite bed and with described tube plate expanded-connecting and/or be welded to connect.
3. a kind of heat exchanger tube and tube sheet syndeton of preventing shell side side clearance corrosion according to claim 2, it is characterized in that: the second composite bed of the local surfaces setting of the inwall of described pore is positioned at a section of close described shell side side.
4. a kind of heat exchanger tube and tube sheet syndeton of preventing shell side side clearance corrosion according to claim 1, it is characterized in that: the side that described the second composite bed is positioned at described tube sheet body is provided with external screw thread, described tube sheet body is provided with the internal thread that is connected with described external screw thread, described heat exchanger tube wear described two-way composite bed and with described tube sheet fixed seal connection.
5. a kind of heat exchanger tube and tube sheet syndeton of preventing shell side side clearance corrosion according to claim 1, it is characterized in that: the end that described the second composite bed is positioned at described shell side side protrudes described the first composite bed setting, and the external tapping of described the second composite bed and described the first composite bed is tightly connected.
6. a kind of heat exchanger tube and tube sheet syndeton of preventing shell side side clearance corrosion according to claim 1, it is characterized in that: described the second composite bed is thin layer melting welding layer, described heat exchanger tube is by electric resistance welding and described tube sheet fixed seal connection.
7. a kind of heat exchanger tube and tube sheet syndeton of preventing shell side side clearance corrosion according to claim 1, it is characterized in that: described heat exchanger tube wears described two-way composite bed and tightens with described tube sheet by described pore and is closely connected.
8. a kind of heat exchanger tube and tube sheet syndeton of preventing the corrosion of shell side side clearance according to claim 1, is characterized in that: the equal setting of the thickness of described the second composite bed.
9. a kind of heat exchanger tube and tube sheet syndeton of preventing the corrosion of shell side side clearance according to claim 1, is characterized in that: the varied in thickness setting of described the second composite bed.
10. described a kind of heat exchanger tube and the tube sheet syndeton of preventing shell side side clearance corrosion of any one according to claim 1 to 9 is characterized in that: described two-way composite bed is with any or several combination in utmost point composite bed, manual electric arc welding composite bed, multilayer explosive welding (EW) composite bed, coating, pressure welding layer, overlay cladding and spray-welding coating.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310107400.8A CN103148734B (en) | 2013-03-29 | 2013-03-29 | A kind of exchanger tubes and tubesheets syndeton of preventing shell side side clearance to corrode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310107400.8A CN103148734B (en) | 2013-03-29 | 2013-03-29 | A kind of exchanger tubes and tubesheets syndeton of preventing shell side side clearance to corrode |
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| CN103148734A true CN103148734A (en) | 2013-06-12 |
| CN103148734B CN103148734B (en) | 2016-04-20 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764347A (en) * | 2015-02-15 | 2015-07-08 | 中国计量学院 | Heat exchanger |
| CN107796012A (en) * | 2017-11-29 | 2018-03-13 | 苏州格瑞码能源环保科技有限公司 | A kind of heat exchanger of improvement |
| CN108072287A (en) * | 2017-11-29 | 2018-05-25 | 苏州格瑞码能源环保科技有限公司 | A kind of heat exchanger |
| CN108507401A (en) * | 2018-03-12 | 2018-09-07 | 孔瑞清 | Pipe heat exchanger and its application in biomedical product production technology |
| CN111811160A (en) * | 2020-07-01 | 2020-10-23 | 同方节能装备有限公司 | Anticorrosion structure of lithium bromide unit water system |
| CN112719535A (en) * | 2020-12-24 | 2021-04-30 | 上海电气核电设备有限公司 | Pipe plate plug of pipe and welding method |
| CN113865408A (en) * | 2020-06-30 | 2021-12-31 | 中国科学院广州能源研究所 | Plastic sealing element structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104764347A (en) * | 2015-02-15 | 2015-07-08 | 中国计量学院 | Heat exchanger |
| CN107796012A (en) * | 2017-11-29 | 2018-03-13 | 苏州格瑞码能源环保科技有限公司 | A kind of heat exchanger of improvement |
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| CN108507401A (en) * | 2018-03-12 | 2018-09-07 | 孔瑞清 | Pipe heat exchanger and its application in biomedical product production technology |
| CN113865408A (en) * | 2020-06-30 | 2021-12-31 | 中国科学院广州能源研究所 | Plastic sealing element structure |
| CN113865408B (en) * | 2020-06-30 | 2024-04-02 | 中国科学院广州能源研究所 | Plastic sealing element structure |
| CN111811160A (en) * | 2020-07-01 | 2020-10-23 | 同方节能装备有限公司 | Anticorrosion structure of lithium bromide unit water system |
| CN112719535A (en) * | 2020-12-24 | 2021-04-30 | 上海电气核电设备有限公司 | Pipe plate plug of pipe and welding method |
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| CN103148734B (en) | 2016-04-20 |
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| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 525024 Guangdong City, Maoming Province Ring West Road, No. 91 Patentee after: Maoming gravity Petrochemical Equipment Co Ltd Address before: 525024 Maoming City, Guangdong Province West Road, Maoming City, the gravity of the Petrochemical Machinery Manufacturing Co., Ltd., Patentee before: The Challenge Petrochemical Machinery Corporation |