CN104043893A - Process for fixing connectors of tube plates of heat exchanger - Google Patents
Process for fixing connectors of tube plates of heat exchanger Download PDFInfo
- Publication number
- CN104043893A CN104043893A CN201410303100.1A CN201410303100A CN104043893A CN 104043893 A CN104043893 A CN 104043893A CN 201410303100 A CN201410303100 A CN 201410303100A CN 104043893 A CN104043893 A CN 104043893A
- Authority
- CN
- China
- Prior art keywords
- heat exchanger
- welding
- exchanger tube
- tube
- tube sheet
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
- B23K31/125—Weld quality monitoring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
- B23K2101/08—Tubes finned or ribbed
Abstract
The invention discloses a process for fixing connectors of tube plates of a heat exchanger. The process comprises the steps of (A) preparation of a heat exchange tubes and the tube plates, (B) connection of the heat exchange tubes and the tube plates and (C) detection of connecting quality, wherein the step (B) comprises tubing and welding of the tube plates and the heat exchange tubes; the tubing process comprises penetration and preliminary connection of the heat exchange tubes in sequence; in the penetrating process of the heat exchange tubes, the free ends of the heat exchange tubes protrude relative to the tube plate, and the protruding length ranges from 4 mm to 7 mm. The welding process comprises the steps that welding is conducted at the connectors of the heat exchange tubes at the centers of the tube plates, then welding is expanded gradually towards the outer edges of the tube plates, and welding of the tube plates at the two ends of the same heat exchange tube is conducted simultaneously; the connectors of the heat exchange tubes are welded in a multi-layer welding mode, and the welding current and welding voltage on each layer are limited at the same time. The process is simple, the service life of a tube type heat exchanger is greatly prolonged, and the maintenance cost of the tube type heat exchanger is lowered.
Description
Technical field
The present invention relates to the manufacturing process of heat exchanger, particularly relate to a kind of heat exchanger tube sheet joint technique for fixing.
Background technology
Heat exchanger (English Translation: heat exchanger), be the equipment of cold fluid that the part heat of hot fluid is passed to, claim again heat exchanger.Heat exchanger is the common apparatus of petroleum industry department, occupies aborning critical role, and tubular heat exchanger, as the Yi Ge branch of heat exchanger, is widely used in petrochemical industry.
In tubular heat exchanger, the joint of tube-to-tube sheet connection is subject to the acting in conjunction of stress and dielectric corrosion in heat exchanger use procedure, for the trouble point being prone to most in tubular heat exchanger, after top connection broken invalid, cold fluid and hot fluid mixes mutually, cause conducting heat quality and product quality declines, and impact is normally produced.
Summary of the invention
Joint for tube-to-tube sheet connection in above-mentioned prior art is the trouble point being prone to most in tubular heat exchanger, after top connection broken invalid, cold fluid and hot fluid mixes mutually, quality and product quality decline cause conducting heat, the normal problem of producing of impact, the invention provides a kind of heat exchanger tube sheet joint technique for fixing.
For the problems referred to above, a kind of heat exchanger tube sheet joint technique for fixing provided by the invention solves problem by following technical essential: a kind of heat exchanger tube sheet joint technique for fixing, comprises following steps in sequence:
A) preparation of heat exchanger tube and tube sheet;
B) heat exchanger tube and tube sheet is connected;
C) quality of connection detects;
Described step B) comprise pipe arrangement and the welding of tube sheet and heat exchanger tube, described pipe arrangement comprises that heat exchanger tube wears with heat exchanger tube in sequence and is tentatively connected, heat exchanger tube wears in operation, heat exchanger tube free end protrudes with respect to tube sheet, and protrusion length is 4-7mm, described heat exchanger tube tentatively connects operation for adopting intensity expanded joint to realize the preliminary fixing of heat exchanger tube and tube sheet;
Described welding sequence is: first from the heat exchanger tube joint welding of tube sheet center, progressively to tube sheet outer rim, expand again, and the Tube-sheet Welding at the same heat exchanger tube of above process two ends carries out simultaneously, the Type of Welding of described heat exchanger tube joint welding adopts the mode of multilayer welding, being about to all joints completes after welding operation, carry out again welding next time, until meet the requirements of weld seam form, the welding current of welding is for the first time in the scope of 90-100A, the follow-up welding current of welding next time carrying out increases gradually, and recruitment is no more than 20A, the weldingvoltage of each welding is all less than 30V.
Further technical scheme is:
Described steps A) in, the preparation of heat exchanger tube comprises that the raw material carrying out is successively prepared, bench is shaped and the long Pipe Cutting of fixed tube;
The preparation of tube sheet comprises and drills the pore wearing for heat exchanger tube, and the caliber of described pore is greater than the number range of heat exchange tube diameter within the scope of 0.1-0.15mm.
Described steps A) in, also comprise the preparation of deflection plate, the preparation of described deflection plate comprises and drills the baffle hole wearing for heat exchanger tube, drilling of described baffle hole adopts deflection plate and the overlapping boring of tube sheet, and pore is synchronizeed the processing mode drilling and is achieved with baffle hole.
Described steps A) in, the preparation of tube sheet also comprises pore precision control step, described pore precision is controlled step and is comprised: the drift that a diameter equates with pore diameter lower limit is set, the no-go gage that a diameter equates with the pore diameter upper limit is set, and the aperture of measuring pore by drift and no-go gage checks out the pore that does not meet processing request; The described pore that does not meet processing request is carried out to repair welding or grinding process.
Described step B) in, welding manner is for filling silk argon arc welding, and welded rear weld bead height and be not less than 1.4 times of pipe thickness.
Described silk filling argon arc welding is double-deck argon arc welding, and second layer welding bead starting the arc place angle 15 ° of the little Yi not that depart from ground floor welding bead arcing point.
Described step C) comprise at least one in full water test, pressure test, the water pressure test.
The present invention has following beneficial effect:
1, technique of the present invention is simple, after adopting the mode of intensity expanded joint to realize tentatively fixing of heat exchanger tube and tube sheet before welding, weld again, and adopt heat exchanger tube free end to protrude with respect to tube sheet, the assembly technology requirement that protrusion length is 4-7mm, make the joint of heat exchanger tube and tube sheet reliable and stable, the version flushing with tube sheet with respect to the heat exchanger tube of available technology adopting, improved more than three times the service life of tube-to-tubesheet joint, greatly extended the service life and the maintenance cost that has reduced tubular heat exchanger of tubular heat exchanger.
2, welding sequence provided by the invention, by the version that adopts each heat exchanger tube weld seam multiple welding multilayer to form, can reduce weld seam sweating heat in forming process big or small to the size of the heat affected area of tube sheet and heat exchanger tube and thermal stress, intensity and the decay resistance that is conducive to keep heat exchanger tube and tube sheet itself to have, reduce the thermal stress size on heat exchanger tube and tube sheet, can further guarantee the q&r that heat exchanger tube is connected with tube sheet.
The specific embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but structure of the present invention is not limited only to following examples.
Embodiment 1:
A heat exchanger tube sheet joint technique for fixing, comprises following steps in sequence:
A) preparation of heat exchanger tube and tube sheet;
B) heat exchanger tube and tube sheet is connected;
C) quality of connection detects;
Described step B) comprise pipe arrangement and the welding of tube sheet and heat exchanger tube, described pipe arrangement comprises that heat exchanger tube wears with heat exchanger tube in sequence and is tentatively connected, heat exchanger tube wears in operation, heat exchanger tube free end protrudes with respect to tube sheet, and protrusion length is 4-7mm, described heat exchanger tube tentatively connects operation for adopting intensity expanded joint to realize the preliminary fixing of heat exchanger tube and tube sheet;
Described welding sequence is: first from the heat exchanger tube joint welding of tube sheet center, progressively to tube sheet outer rim, expand again, and the Tube-sheet Welding at the same heat exchanger tube of above process two ends carries out simultaneously, the Type of Welding of described heat exchanger tube joint welding adopts the mode of multilayer welding, being about to all joints completes after welding operation, carry out again welding next time, until meet the requirements of weld seam form, the welding current of welding is for the first time in the scope of 90-100A, the follow-up welding current of welding next time carrying out increases gradually, and recruitment is no more than 20A, the weldingvoltage of each welding is all less than 30V.
Concrete, after adopting the mode of intensity expanded joint to realize tentatively fixing of heat exchanger tube and tube sheet before welding, weld again, and adopt heat exchanger tube free end to protrude with respect to tube sheet, the assembly technology requirement that protrusion length is 4-7mm, make the joint of heat exchanger tube and tube sheet reliable and stable, the version flushing with tube sheet with respect to the heat exchanger tube of available technology adopting, improved more than three times the service life of tube-to-tubesheet joint, greatly extended the service life and the maintenance cost that has reduced tubular heat exchanger of tubular heat exchanger.
The welding sequence providing in the present embodiment, by the version that adopts each heat exchanger tube weld seam multiple welding multilayer to form, can reduce weld seam sweating heat in forming process big or small to the size of the heat affected area of tube sheet and heat exchanger tube and thermal stress, intensity and the decay resistance that is conducive to keep heat exchanger tube and tube sheet itself to have, reduce the thermal stress size on heat exchanger tube and tube sheet, can further guarantee the q&r that heat exchanger tube is connected with tube sheet.
Embodiment 2:
The present embodiment is further qualified on the basis of embodiment 1, described steps A) in the preparation of heat exchanger tube comprise that the raw material carrying out is successively prepared, bench is shaped and the long Pipe Cutting of fixed tube; The preparation of tube sheet comprises and drills the pore wearing for heat exchanger tube, and the caliber of described pore is greater than the number range of heat exchange tube diameter within the scope of 0.1-0.15mm.
In the present embodiment, raw material is prepared the blank that adopts same batch inferior, bench is shaped and adopts same the bench that checking experiment is qualified, the length of the long Pipe Cutting of fixed tube is determined according to shell side length, object is the heat exchanger tube that disposable cutting is met matching requirements, possibility or the degree of to reduce heat exchanger tube, in installation process, polishing, the Accuracy coordinating to reduce abrasive particle heat exchanging tube and tube plate; The diameter of pore and heat exchanger tube is poor to be intended to, in preliminary connection of heat exchanger tube and tube sheet, obtain the swell increment of heat exchanger tube the best.
For ease of the sufficient heat exchanger of good heat exchanger tube or heat exchange that is supported, in the present embodiment, for what obtain having on tube sheet and deflection plate good concentricity, for wearing pore or the baffle hole of heat exchanger tube, provide a kind of fabrication scheme: described steps A) also comprise the preparation of deflection plate, the preparation of described deflection plate comprises and drills the baffle hole wearing for heat exchanger tube, drilling of described baffle hole adopts deflection plate and the overlapping boring of tube sheet, and pore is synchronizeed the processing mode drilling and is achieved with baffle hole.
For guaranteeing the processing request of pore and the checkability of raising pore, described steps A) in, the preparation of tube sheet also comprises pore precision control step, described pore precision is controlled step and is comprised: the drift that a diameter equates with pore diameter lower limit is set, the no-go gage that a diameter equates with the pore diameter upper limit is set, and the aperture of measuring pore by drift and no-go gage checks out the pore that does not meet processing request; The described pore that does not meet processing request is carried out to repair welding or grinding process.
For reducing weld defect, described step B) in, welding manner is the argon arc welding that fills silk, and has welded rear weld bead height and be not less than 1.4 times of pipe thickness.Described silk filling argon arc welding is double-deck argon arc welding, and second layer welding bead starting the arc place angle 15 ° of the little Yi not that depart from ground floor welding bead arcing point.
For guaranteeing the quality of connection between tube sheet and heat exchanger tube, described step C) comprise at least one in full water test, pressure test, the water pressure test.
Above content is the further description of the present invention being done in conjunction with concrete preferred embodiment, can not assert that the specific embodiment of the present invention is confined to these explanations.For general technical staff of the technical field of the invention, not departing from other embodiments that draw under technical scheme of the present invention, all should be included in protection scope of the present invention.
Claims (7)
1. a heat exchanger tube sheet joint technique for fixing, comprises following steps in sequence:
A) preparation of heat exchanger tube and tube sheet;
B) heat exchanger tube and tube sheet is connected;
C) quality of connection detects;
It is characterized in that, described step B) comprise pipe arrangement and the welding of tube sheet and heat exchanger tube, described pipe arrangement comprises that heat exchanger tube wears with heat exchanger tube in sequence and is tentatively connected, heat exchanger tube wears in operation, heat exchanger tube free end protrudes with respect to tube sheet, and protrusion length is 4-7mm, described heat exchanger tube tentatively connects operation for adopting intensity expanded joint to realize the preliminary fixing of heat exchanger tube and tube sheet;
Described welding sequence is: first from the heat exchanger tube joint welding of tube sheet center, progressively to tube sheet outer rim, expand again, and the Tube-sheet Welding at the same heat exchanger tube of above process two ends carries out simultaneously, the Type of Welding of described heat exchanger tube joint welding adopts the mode of multilayer welding, being about to all joints completes after welding operation, carry out again welding next time, until meet the requirements of weld seam form, the welding current of welding is for the first time in the scope of 90-100A, the follow-up welding current of welding next time carrying out increases gradually, and recruitment is no more than 20A, the weldingvoltage of each welding is all less than 30V.
2. a kind of heat exchanger tube sheet joint technique for fixing according to claim 1, is characterized in that described steps A) in the preparation of heat exchanger tube comprise that the raw material carrying out is successively prepared, bench is shaped and the long Pipe Cutting of fixed tube;
The preparation of tube sheet comprises and drills the pore wearing for heat exchanger tube, and the caliber of described pore is greater than the number range of heat exchange tube diameter within the scope of 0.1-0.15mm.
3. a kind of heat exchanger tube sheet joint technique for fixing according to claim 2, it is characterized in that, described steps A) in, also comprise the preparation of deflection plate, the preparation of described deflection plate comprises and drills the baffle hole wearing for heat exchanger tube, drilling of described baffle hole adopts deflection plate and the overlapping boring of tube sheet, and pore is synchronizeed the processing mode drilling and is achieved with baffle hole.
4. a kind of heat exchanger tube sheet joint technique for fixing according to claim 1, it is characterized in that, described steps A) in, the preparation of tube sheet also comprises pore precision control step, described pore precision is controlled step and is comprised: the drift that a diameter equates with pore diameter lower limit is set, the no-go gage that a diameter equates with the pore diameter upper limit is set, and the aperture of measuring pore by drift and no-go gage checks out the pore that does not meet processing request; The described pore that does not meet processing request is carried out to repair welding or grinding process.
5. a kind of heat exchanger tube sheet joint technique for fixing according to claim 1, is characterized in that described step B) in, welding manner is for filling silk argon arc welding, and welded rear weld bead height and be not less than 1.4 times of pipe thickness.
6. a kind of heat exchanger tube sheet joint technique for fixing according to claim 5, is characterized in that, described silk filling argon arc welding is double-deck argon arc welding, and second layer welding bead starting the arc place angle 15 ° of the little Yi not that depart from ground floor welding bead arcing point.
7. according to a kind of heat exchanger tube sheet joint technique for fixing described in any one in claim 1 to 6, it is characterized in that described step C) comprise at least one in full water test, pressure test, the water pressure test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410303100.1A CN104043893A (en) | 2014-06-30 | 2014-06-30 | Process for fixing connectors of tube plates of heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410303100.1A CN104043893A (en) | 2014-06-30 | 2014-06-30 | Process for fixing connectors of tube plates of heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104043893A true CN104043893A (en) | 2014-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410303100.1A Pending CN104043893A (en) | 2014-06-30 | 2014-06-30 | Process for fixing connectors of tube plates of heat exchanger |
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| Country | Link |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009250443A (en) * | 2008-04-01 | 2009-10-29 | Daikin Ind Ltd | Shell and tube heat exchanger and method for manufacturing the same |
| CN101695807A (en) * | 2009-11-06 | 2010-04-21 | 倪加明 | Manufacturing method of dual-tubesheet heat interchanger |
| CN201799751U (en) * | 2010-08-11 | 2011-04-20 | 南京宝色股份公司 | Welding structure adopting expansion after welding for heat exchange pipe and pipe sheet |
| CN102233472A (en) * | 2010-04-22 | 2011-11-09 | 上海华谊集团装备工程有限公司 | Process for positioning and welding reaction tube and tube plates in large-scale tubular reactor |
| CN202329385U (en) * | 2011-11-29 | 2012-07-11 | 上海多尔流体设备有限公司 | Connecting device for column tube type heat exchanger |
| CN103769726A (en) * | 2014-02-14 | 2014-05-07 | 中国船舶重工集团公司第七�三研究所 | Tube and tube plate welding structure capable of reducing residual stress |
-
2014
- 2014-06-30 CN CN201410303100.1A patent/CN104043893A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009250443A (en) * | 2008-04-01 | 2009-10-29 | Daikin Ind Ltd | Shell and tube heat exchanger and method for manufacturing the same |
| CN101695807A (en) * | 2009-11-06 | 2010-04-21 | 倪加明 | Manufacturing method of dual-tubesheet heat interchanger |
| CN102233472A (en) * | 2010-04-22 | 2011-11-09 | 上海华谊集团装备工程有限公司 | Process for positioning and welding reaction tube and tube plates in large-scale tubular reactor |
| CN201799751U (en) * | 2010-08-11 | 2011-04-20 | 南京宝色股份公司 | Welding structure adopting expansion after welding for heat exchange pipe and pipe sheet |
| CN202329385U (en) * | 2011-11-29 | 2012-07-11 | 上海多尔流体设备有限公司 | Connecting device for column tube type heat exchanger |
| CN103769726A (en) * | 2014-02-14 | 2014-05-07 | 中国船舶重工集团公司第七�三研究所 | Tube and tube plate welding structure capable of reducing residual stress |
Non-Patent Citations (2)
| Title |
|---|
| 叶文邦 等: "《压力容器设计指导手册（下）》", 31 August 2006 * |
| 李培学 等: "浅谈换热器管板与换热器胀焊并用连接的制造工艺", 《氮肥技术》 * |
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Application publication date: 20140917 |
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