CN1068109C - Method for manufacturing shell-and-tube prestressed heat exchanger - Google Patents
Method for manufacturing shell-and-tube prestressed heat exchanger Download PDFInfo
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- CN1068109C CN1068109C CN 96116870 CN96116870A CN1068109C CN 1068109 C CN1068109 C CN 1068109C CN 96116870 CN96116870 CN 96116870 CN 96116870 A CN96116870 A CN 96116870A CN 1068109 C CN1068109 C CN 1068109C
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- heat exchanger
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- shell
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000003466 welding Methods 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 abstract 1
- 238000013459 approach Methods 0.000 description 11
- 230000035882 stress Effects 0.000 description 11
- 238000012937 correction Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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Abstract
The invention provides a manufacturing method of a tube-shell type fixed tube plate heat exchanger, which is characterized in that a circumferential weld is reserved on a shell of the heat exchanger, and the circumferential weld is welded and sealed after prestress is applied to a heat exchange tube nest. The stress is applied by introducing a heat medium into the heat exchange tube array, and the prestress is applied by controlling the temperature difference value between the heat exchange media before sealing and welding. The prestress heat exchanger manufactured by the method has the advantages that the temperature difference stress of each main element is close to zero in the normal use process, the economy and the safety of the heat exchanger are greatly improved, the stress applied to the heat exchanger in the transportation and placement processes is also greatly reduced because no heat medium participates, and the harm of the stress to the heat exchanger is also greatly reduced.
Description
The present invention relates to a kind of method for manufacturing of heat-exchange device, especially the manufacture method of shell-and-tube fixed tube-sheet exchanger.
What be most widely used in heat transmission equipment is shell-and-tube heat exchanger, present this heat exchanger is taken as a kind of traditional heat transmission equipment and is used in a large number in many industrial departments, especially in chemical process, no matter be at home or abroad, it is still occupied an leading position in all heat transmission equipments, it can not only obtain minimum housing internal diameter, and simple in structure, specification limit is wide, and cost is lower.But the greatest weakness of this heat exchanger is when to be exactly the temperature difference when housing and pipe big slightly (regulation and stipulation is 50 degrees centigrade), damage for fear of thermal (temperature difference) stress, just have to be provided with the expansion joint device, thermal stress to reduce to produce because of the temperature difference causes complicate fabrication process so again, and cost increases, the many shortcomings of degradation under the voltage endurance capability of shell side, expansion joint place flow resistance increases in addition, and fluid abrasion increases the weight of, and very easily causes heat exchanger to destroy at the expansion joint place.Secondly, because expansion joint itself has certain rigidity, in any case can not thoroughly eliminate heat exchanger thermal (temperature difference) stress in use, thus make heat exchanger tube produce various stress effects with the join of tube sheet, and then generation stress corrosion, this also is the principal mode that heat exchanger destroys.
The objective of the invention is to, a kind of brand-new heat exchanger manufacture method is proposed, be exactly in the manufacturing process of heat exchanger with prestressing force " storage " in heat exchanger, thereby change the stress of heat exchanger main element (heat exchanger tube, tube sheet, heat exchanger shell), make heat exchanger when reality is used, the thermal (temperature difference) stress of its structure equals zero, thereby the unfavorable factor that produces in the common heat exchanger is converted into favorable factor.Can reduce the cost of heat exchanger on the one hand, have better economic to be worth; On the other hand, the almost elimination of thermal (temperature difference) stress is also improved a lot heat exchanger security in use.
Manufacturing heat exchanger method provided by the present invention is: at first according to the production and construction method of the shell-and-tube fixed tube-sheet exchanger of routine, the two ends of heat exchanging pipe are fixed on the tube sheet, end socket is fixed on the outside of two tube sheets, but, reserve a girth joint on the housing of heat exchanger, prestressing force to be applied is welding again behind heat exchanging pipe.
This method prestressing force apply by simulation heat exchanger actual environment for use and in addition suitably correction realize.Correction is then measured to determine by experiment.
Advantage of the present invention is: can improve the stress of heat exchanger, also main pressurized element that can the heat exchanging device produces adverse influence, and manufacturing operation also is simple and feasible.In addition, the heat exchanger of employing prestressing force manufacturing can also be simplified the design work amount of heat exchange greatly, it no longer needs expansion joint is calculated, need only be according to heat exchanger temperature approach in actual use, and the temperature difference that the correction data that obtain in conjunction with measuring are controlled manufacture process gets final product.
Accompanying drawing 1 is the structural representation of shell-and-tube fixed tube sheet prestressed heat exchanger of the present invention.
Accompanying drawing 2 is a shell-type prestressed heat exchanger manufacturing process flow diagram of the present invention.
Introduce a concrete example of making of the present invention below in conjunction with accompanying drawing.
At first according to the production and construction method of the shell-and-tube fixed tube-sheet exchanger of routine, the two ends of heat exchanging pipe 1 are fixed on the tube sheet 2, end socket 3 is fixed on the outside (referring to Fig. 1) of two tube sheets 2.Different is, on the housing 4 of heat exchanger, reserve a girth joint 5, as shown in Figure 2, by head tank 6, Far-infrared Heating device 7, filter 8, the thermal medium feed system that hot oil pump 9 and pressure and temp indicating meter are constituted continuously feeds thermal medium A (conduction oil) in heat exchanger tube, medium B is an air, because heat medium temperature is than original tube temperature height, pipe will produce expansion, weld seam 5 not welding this moment, therefore the expansion of tubulation is freely, the expansion of tubulation, be with tube sheet to do axial displacement, the spacing of weld seam just strengthens, the size of this weld spacing and A, temperature approach between B two media is relevant, when two medium temperature approach reach the set point value of process correction, with welding gun 10 weld seam is welded again, remove thermal medium A then, reduction along with the tubulation temperature, heat exchanger tube shrinks, this moment, housing was welded into integral body, because the temperature of housing does not almost have anything to change, housing has retrained the contraction of tubulation, in tubulation, just set up pre-tensile stress like this, in housing, set up compressive pre-stress.
Because main element all exists storage as temperature deformation in this heat exchanger manufacture process, plastic deformation, reasons such as strain, the prestressing force of originally setting up in heat exchanger is decreased, the big young pathbreaker of this loss of prestress is directly connected to the size and the effect of prestress, so when the welding ring weld seam, must consider, the temperature approach that sets should have a correction, temperature approach when promptly applying prestressing force between heat exchange medium is greater than the temperature approach between heat exchange medium when this heat exchanger is actual to be used, thereby the thermal (temperature difference) stress that guarantees structure in the actual use of this heat exchanger equals or approaches zero.At the production of same lot number heat exchanger, the size of the correction of this temperature approach adopts the method for measuring to determine usually.Specific practice is, before feeding thermal medium to heat exchanging pipe, on heat exchanging pipe, be provided with " resistance strain gage ", feed thermal medium, when the heat exchange medium temperature difference is a certain value, from with the joining instrument indication electric meter of resistance strain gage on just can learn the swell increment of heat exchanging pipe under this temperature approach, then housing is carried out boxing, this moment, prestressing force was applied on this heat exchanger, when feeding thermal medium once more, make two kinds of temperature difference between the heat transferring medium in the actual use of this heat exchanger during the temperature difference, read the heat exchanging pipe swell increment of this moment by the indication electric meter that resistance strain gage connected again, if the swell increment of this moment equates with the preceding swell increment of setting tubulation under the temperature difference situation of boxing or is very approaching, when boxing is described between selected medium temperature approach suitable, exceeded allowed band if twice swell increment differs, heat exchange medium temperature approach selected when boxing is described also need adjust.
Claims (2)
1, a kind of manufacture method of shell-type prestressed heat exchanger, at first the two ends with heat exchanging pipe are fixed on the tube sheet, end socket is fixed on the outside of two tube sheets again, it is characterized in that: reserve a girth joint on the housing of heat exchanger, prestressing force to be applied is welding again behind heat exchanging pipe.
2, shell-type prestressed heat exchanger manufacture method according to claim 1 is characterized in that: apply prestressing force to heat exchanging pipe and realize by feeding thermal medium to heat exchanging pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96116870 CN1068109C (en) | 1996-04-01 | 1996-04-01 | Method for manufacturing shell-and-tube prestressed heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96116870 CN1068109C (en) | 1996-04-01 | 1996-04-01 | Method for manufacturing shell-and-tube prestressed heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1162105A CN1162105A (en) | 1997-10-15 |
| CN1068109C true CN1068109C (en) | 2001-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96116870 Expired - Fee Related CN1068109C (en) | 1996-04-01 | 1996-04-01 | Method for manufacturing shell-and-tube prestressed heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1068109C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6303552B2 (en) * | 2014-02-04 | 2018-04-04 | コクヨ株式会社 | scissors |
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1996
- 1996-04-01 CN CN 96116870 patent/CN1068109C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1162105A (en) | 1997-10-15 |
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