EP0523039B1 - Unloaded heat exchanger tube sheet - Google Patents
Unloaded heat exchanger tube sheet Download PDFInfo
- Publication number
- EP0523039B1 EP0523039B1 EP90908144A EP90908144A EP0523039B1 EP 0523039 B1 EP0523039 B1 EP 0523039B1 EP 90908144 A EP90908144 A EP 90908144A EP 90908144 A EP90908144 A EP 90908144A EP 0523039 B1 EP0523039 B1 EP 0523039B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- connecting member
- shell
- heat exchanger
- tube sheet
- membrane
- 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.)
- Expired - Lifetime
Links
- 239000012528 membrane Substances 0.000 claims abstract description 38
- 238000005452 bending Methods 0.000 claims abstract description 5
- 239000007769 metal material Substances 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 8
- 210000003660 reticulum Anatomy 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 230000001627 detrimental effect Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/0236—Header boxes; End plates floating elements
- F28F9/0241—Header boxes; End plates floating elements floating end plates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
- F28F2265/26—Safety or protection arrangements; Arrangements for preventing malfunction for allowing differential expansion between elements
Definitions
- the present invention relates to a heat exchanger having a heat exchanger vessel with a shell and, disposed inside the shell, at least one tube sheet to which a number of heat exchanger tubes are connected and whose edge portion is sealingly connected to the shell.
- the invention more specifically relates to an arrangement in which the tube sheet is connected to the shell by means of a flexible connecting member.
- the tube sheet In a conventional heat exchanger, the tube sheet (or tube sheets, since there generally are two such sheets) normally has the largest wall thickness of the construction. The reason for this is that the tube sheet edge portion fixed to the shell is subjected to substantial loads as a result of differences in thermal expansion between the shell and the tubes mounted in the tube sheet. Moreover, the edge portion of the tube sheet must be capable of withstanding pressure from one side. The load of such a pressure, which may be an external pressure or an internal pressure, is taken up in the form of bending stresses in the edge portion of the tube sheet, which necessitates a considerable wall thickness of the tube sheet.
- Patent Specification US-A-1,876-401 describes a heat exchanger as defined in the preamble clause of claim 1, the connecting member being a highly flexible gasket and comprising circular sections having associated circle centres on alternate sides of the connecting member.
- the connecting member generally operates as a bellows means.
- the object of the present invention is to provide a heat exchanger of the type stated in the introduction to this specification, which substantially overcomes the problems discussed above, while simultaneously yielding further essential advantages in constructional respects.
- a heat exchanger having a heat exchanger vessel with a shell and, disposed inside the shell, at least one tube sheet to which a number of heat exchanger tubes are connected and whose edge portion is sealingly connected to the shell by means of a flexible connecting member, such that thermal expansion between the shell and the tube sheet can be taken up as bending of the connecting member which is designed as part of a toroid having a cross-section of arched configuration, said heat exchanger, being characterised in that the connecting member is in the form of a thin membrane shell of metallic material, generally steel and preferably stainless steel, and of continuous curvature, said membrane shell having substantially the shape of a quarter circle, at least in the unloaded state, such that loads deriving from pressure differences across the connecting member can be taken up as general membrane stresses in the connecting member.
- the quarter-circle shape imparts to the connecting member the essential property of being able to withstand substantially the same pressure exerted from one side, against either the concave or the convex side thereof, while also ensuring good resilience. Further, this construction entails economy of material.
- the connecting member arrangement according to the invention means that thermal expansion can readily be taken up as bending of the pliable connecting member, while at the same time pressure exerted from one side can be taken up as general membrane stresses well distributed over the membrane of the connecting member.
- general membrane stresses as used herein has the current meaning adopted in the art.
- the arrangement according to the invention makes it possible to cope with thermal displacement and pressure loads from one side without the occurrence of any major forces or moments in the construction.
- the tube sheet itself will not be subjected to any substantial forces or moments from its edge portion. It can therefore be made much thinner than the tube sheets of conventional constructions.
- the thickness of the tube sheet can be reduced down to 10-20% of normal thickness. This reduction in thickness by up to 90% entails very substantial cuts of the costs for material and, in many cases, also of the manufacturing costs.
- the tube sheet is thin, the holes made in it for mounting the tubes can be punched instead of drilled.
- the number of tubes mostly being very large, this means that the operation of forming holes in the tube sheet is highly facilitated and becomes considerably less costly.
- the thin, shell-like connecting member can easily be fixed to the edge of the tube sheet and to the shell of the heat exchanger vessel, e.g. by welding.
- the connecting member can also be designed as a continuous extension of the tube sheet or a part of the shell, in which case such an extension may have a tube sheet or shell wall thickness reduced to a suitable extent. Integrating the connecting member with the tube sheet or the shell wall permits using highly simplified and less expensive manufacturing techniques.
- the invention also yields a very compact construction with a small gap between the edge of the tube sheet and the shell wall, which means that the interior of the heat exchanger can be utilised more efficiently.
- the connecting member according to the invention preferably has a uniform thickness throughout its membrane surface.
- the connecting member may of course comprise special edge fixing means for fixing to the tube sheet and to the shell.
- a stiffening ring or flange can be provided at the edge of the tube sheet outside the tubes. This ring or flange may be rigidly or elastically fixed to the tube sheet. It may also form a continuous extension of the tube sheet.
- Fig. 1 is a schematic, vertical longitudinal section of a horizontal heat exchanger including an arrangement according to the invention.
- Fig. 2 is a schematic part-sectional view showing an embodiment of a connecting member according to the invention.
- Figs 3-9 are views similar to Fig. 2, but illustrating alternative embodiments of a connecting member according to the invention.
- Fig. 1 schematically shows a vertical longitudinal section of a horizontal heat exchanger incorporating an connecting member arrangement according to the invention.
- the heat exchanger comprises in conventional manner a cylindrical shell 1; two bonnets 2 and 3 fixed to the shell by means of flange joints 5; two tube sheets 7, 8, the planes of which are perpendicular to the axis of the shell 1 and which are disposed at each end of the shell; tubes 9 fixed in holes in the tube sheets and extending between the tube sheets parallel to the axis of the shell; baffles 11, 12, 13 parallel to the tube sheets 7, 8 and distributed along the tubes 9; an inlet 15 at the top of the shell 1 at one side thereof for supplying a first heat exchanger fluid; an outlet 17 at the bottom of the shell at the other side thereof for evacuating the first heat exchanger fluid; an inlet 19 centrally disposed in the bonnet 3 for supplying a second heat exchanger fluid to pass through a first set of tubes 9 to the space inwardly of the bonnet 2; and an outlet 21 disposed at the bottom
- the central baffle 12 is fixed to the shell, and the tubes 9 in turn are fixed to the baffle 12 at the point where they pass through it.
- the baffles 11 and 13 are fixed to the baffle 12 by means of spacer rods 25, but are movable relative to the shell.
- the tubes 9 pass through holes in the baffles 11 and 13, these holes being slightly larger than the tubes, such that the tubes 9 and the baffles 11 and 13 are movable in relation to each other.
- the baffles 11, 12, 13 do not extend over the entire circular cross-section and are so alternatingly adjoining the shell 1 that the first heat exchanger fluid is caused to follow an alternating downward and upward flow path about the tubes 9, as indicated by the arrows 27.
- the second heat exchanger fluid is supplied to the first limited set of tubes 9 from the inlet 19 by means of a tubular duct 26.
- This consists of two telescopic tube parts 29, 30.
- the part 29 is connected to the inlet 19, and the part 30 is connected to the tube sheet, around the associated tubes.
- the part 29 can be displaced within the part 30 in connection with thermally-conditioned displacements of the tube sheet 8, a seal 31 ensuring adequate sealing with respect to the space inwardly of the bonnet 3.
- the seal 31 may be a simple gland-type seal, since the pressure exerted across it does not exceed the pressure drop of the second heat exchanger fluid during its passage through the tubes 9.
- the flow path of the second heat exchanger fluid is indicated by the arrows 28.
- Figs 2-9 all schematically illustrate the provision of a metallic, shell-like connecting member 23, viz. in an enlarged partial section taken along a diameter, parallel to the axis of the shell 1.
- the section is taken at right angles to the centre axis of the connecting member 23 designed as a shell portion of an annular toroid.
- the connecting member 23 is a thin membrane shell of metal having the cross-sectional shape of a quarter circle, i.e. a 90° circular arc (in the unloaded state).
- the edges of the membrane shell are extended and fixed to the lower, i.e. "outer" edge surface 31 (in the Figure) of the tube sheet 8 and to the inner surface of the shell 1. Said edges are connected tangentially both to the inner surface of the shell 1 and to the tube sheet 8.
- the connection is performed by welding, as shown in the respective Figures.
- the membrane shell is located below the plane of the tube sheet 8, i.e. on the outside thereof.
- An “external” pressure exerted from one side is readily taken up as membrane stresses, as indicated by arrows 33.
- an "internal" pressure from one side can just as easily be taken up as membrane stresses thanks to the configuration of the membrane shell.
- the membrane shell is connected orthogonally both to the tube sheet 8 and to the shell 1, and the extended fixing portion 37 of the membrane shell 23 is connected tangentially to a shell flange 5 and provided with a gasket 39 on its underside.
- the fixing portion of the membrane shell at the tube sheet 8 is extended so as to project on the opposite side of the tube sheet 8.
- the thus projecting portion 35 has been found to improve the mounting strength and stability.
- the membrane shell 23 and the extended portion 35 thereof are welded to the edge of the tube sheet 8 at its upper and lower side, respectively.
- An "internal" pressure exerted from one side is indicated by arrows 34.
- Fig. 4 shows an embodiment of the same general type as that in Fig. 2, but the connecting member 23 here is a continuous extension of the tube sheet 8.
- This extension has a reduced wall thickness and protrudes from the upper side (i.e. "inner side") of the tube sheet 8.
- the free end surface 41 of the tube sheet is concave in conformity with the curvature of the membrane shell 23 so as to provide a smooth transition. In this manner, it is possible to avoid detrimental stress concentrations.
- the opposite end of the membrane shell 23, which is welded to the shell 1 is thickened by the curvature of the membrane shell continuing a slight distance after the 90° arc.
- the weld joint 43 is located in the plane of the inner wall of the shell 1.
- Fig. 5 shows an embodiment which is analogous with that of Fig. 2, although it is here a matter of an "internal" pressure exerted from one side.
- the curvature or arch of the membrane shell 23 thus is reversed, facing downwards, i.e. outwards.
- the pressure thus acts within the concave, arched membrane shell to achieve the optimum membrane stress effect.
- the membrane shell according to the invention can also take up pressure exerted only from the opposite, convex side.
- the connecting member 23 here is a continuous extension of the shell 1.
- the transition to the shell 1 is designed in the same way as the transition to the tube sheet 8 in Fig. 4.
- the membrane shell 23 is welded to the lower part of the end edge surface.
- the end edge surface 45 otherwise is concave with a smooth transition from the curvature of the membrane shell 23, whereby to avoid detrimental stress concentrations.
- Fig. 6 shows an embodiment which is analogous with that of Fig. 1, although modified in two respects.
- the membrane shell 23 is welded to the lower part of the end edge surface of the tube sheet (as in Fig. 5), and the end edge surface is formed with a continuously connected, circumferential groove 47.
- an annular cylindrical stiffening ring 49 is rigidly mounted (in this case welded) on the upper side of the tube sheet 8 directly at the circumferential edge of the sheet.
- the ring 49 projects inwards, i.e. in the opposite direction with respect to the membrane shell 23, orthogonally to the tube sheet 8.
- Fig. 7 shows an embodiment which is analogous (although reversed) with respect to that of Fig. 3. It is however intended for "internal" pressure and includes a stiffening ring 49 as in Fig. 6.
- the stiffening ring is however resiliently mounted by being welded to the projecting portion 35 of the membrane shell 23.
- a circumferential groove 51 eliminating stress concentrations is provided on the underside of the tube sheet 8 in the immediate vicinity of the weld 53 between the tube sheet 8 and the membrane shell 23.
- the groove 51 and the weld 53 provide a smooth, curved transition between the membrane shell 23 and the tube sheet 8.
- Fig. 8 shows an embodiment which is analogous with that of Fig. 5, but, additionally, provided with a stiffening ring 49, as in Fig. 6.
- Fig. 9 shows an embodiment in which the membrane shell 23 is tangentially connected by welding to the shell 1 at one end, while its other end is welded to the free end surface 55 of a fixed stiffening ring 49 projecting downwards from the lower edge portion of the tube sheet 8.
- the ring does not project at right angles from the tube sheet, but obliquely inwardly towards the centre of the heat exchanger, i.e. away from the shell 1.
- the lowermost portion 57 of the ring is bent backwards so as to be perpendicular to the plane of the tube sheet 8.
- An annular concave groove 59 is connected to the upper weld between the membrane shell 23 and the ring portion 57, whereby to avoid detrimental stress concentrations.
- this arrangement means that the gap 61 between the shell 1 and the edge of the tube sheet 8 can be reduced, thus improving the utilisation of the interior of the heat exchanger.
- the heat exchanger shown in Fig. 1 uses two movable tube sheets, which entails a horizontal heat exchanger, as well as the illustrated, preferred arrangement of the baffles.
- Other embodiments are however conceivable within the scope of the inventive concept.
- Movable baffles are then mounted in conventional manner by means of spacer members in the stationary tube sheet.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
- The present invention relates to a heat exchanger having a heat exchanger vessel with a shell and, disposed inside the shell, at least one tube sheet to which a number of heat exchanger tubes are connected and whose edge portion is sealingly connected to the shell. The invention more specifically relates to an arrangement in which the tube sheet is connected to the shell by means of a flexible connecting member.
- In a conventional heat exchanger, the tube sheet (or tube sheets, since there generally are two such sheets) normally has the largest wall thickness of the construction. The reason for this is that the tube sheet edge portion fixed to the shell is subjected to substantial loads as a result of differences in thermal expansion between the shell and the tubes mounted in the tube sheet. Moreover, the edge portion of the tube sheet must be capable of withstanding pressure from one side. The load of such a pressure, which may be an external pressure or an internal pressure, is taken up in the form of bending stresses in the edge portion of the tube sheet, which necessitates a considerable wall thickness of the tube sheet.
- With a view to reducing the stresses due to expansion, certain heat exchangers have been provided with expansion bellows in the shell side. Although this means that the problems linked with thermal expansion are overcome, there instead arise other problems in that the load caused by internal overpressure increases.
- It has also been suggested to connect the tube sheet to the shell by means of a flexible connecting member, such as bellows means or a flat membrane, so as to obviate the expansion problems. This does however not solve the problems of pressure exerted from one side.
- Patent Specification US-A-1,876-401 describes a heat exchanger as defined in the preamble clause of
claim 1, the connecting member being a highly flexible gasket and comprising circular sections having associated circle centres on alternate sides of the connecting member. Thus, the connecting member generally operates as a bellows means. - The object of the present invention is to provide a heat exchanger of the type stated in the introduction to this specification, which substantially overcomes the problems discussed above, while simultaneously yielding further essential advantages in constructional respects.
- According to the invention, the object stated above is achieved by a heat exchanger having the features recited in the accompanying claims.
- According to the invention, there is thus provided a heat exchanger having a heat exchanger vessel with a shell and, disposed inside the shell, at least one tube sheet to which a number of heat exchanger tubes are connected and whose edge portion is sealingly connected to the shell by means of a flexible connecting member, such that thermal expansion between the shell and the tube sheet can be taken up as bending of the connecting member which is designed as part of a toroid having a cross-section of arched configuration, said heat exchanger, being characterised in that the connecting member is in the form of a thin membrane shell of metallic material, generally steel and preferably stainless steel, and of continuous curvature, said membrane shell having substantially the shape of a quarter circle, at least in the unloaded state, such that loads deriving from pressure differences across the connecting member can be taken up as general membrane stresses in the connecting member. The quarter-circle shape imparts to the connecting member the essential property of being able to withstand substantially the same pressure exerted from one side, against either the concave or the convex side thereof, while also ensuring good resilience. Further, this construction entails economy of material.
- In other words, the connecting member arrangement according to the invention means that thermal expansion can readily be taken up as bending of the pliable connecting member, while at the same time pressure exerted from one side can be taken up as general membrane stresses well distributed over the membrane of the connecting member. The expression "general membrane stresses" as used herein has the current meaning adopted in the art.
- The arrangement according to the invention makes it possible to cope with thermal displacement and pressure loads from one side without the occurrence of any major forces or moments in the construction. In particular, the tube sheet itself will not be subjected to any substantial forces or moments from its edge portion. It can therefore be made much thinner than the tube sheets of conventional constructions. Typically, it has been found that when using the arrangement according to the invention, the thickness of the tube sheet can be reduced down to 10-20% of normal thickness. This reduction in thickness by up to 90% entails very substantial cuts of the costs for material and, in many cases, also of the manufacturing costs. Thus, since the tube sheet is thin, the holes made in it for mounting the tubes can be punched instead of drilled. The number of tubes mostly being very large, this means that the operation of forming holes in the tube sheet is highly facilitated and becomes considerably less costly.
- The thin, shell-like connecting member can easily be fixed to the edge of the tube sheet and to the shell of the heat exchanger vessel, e.g. by welding. The connecting member can also be designed as a continuous extension of the tube sheet or a part of the shell, in which case such an extension may have a tube sheet or shell wall thickness reduced to a suitable extent. Integrating the connecting member with the tube sheet or the shell wall permits using highly simplified and less expensive manufacturing techniques. The invention also yields a very compact construction with a small gap between the edge of the tube sheet and the shell wall, which means that the interior of the heat exchanger can be utilised more efficiently.
- The connecting member according to the invention preferably has a uniform thickness throughout its membrane surface. In addition to the toroid membrane, the connecting member may of course comprise special edge fixing means for fixing to the tube sheet and to the shell. In order to further reduce the loads on the tube sheet in the tubed area and to bridge minor untubed areas at the edge portion of the tube sheet, a stiffening ring or flange can be provided at the edge of the tube sheet outside the tubes. This ring or flange may be rigidly or elastically fixed to the tube sheet. It may also form a continuous extension of the tube sheet.
- Other features and advantages of the heat exchanger according to the invention will appear from the following description of exemplifying embodiments thereof with reference to the accompanying drawings.
- Fig. 1 is a schematic, vertical longitudinal section of a horizontal heat exchanger including an arrangement according to the invention. Fig. 2 is a schematic part-sectional view showing an embodiment of a connecting member according to the invention. Figs 3-9 are views similar to Fig. 2, but illustrating alternative embodiments of a connecting member according to the invention.
- Fig. 1 schematically shows a vertical longitudinal section of a horizontal heat exchanger incorporating an connecting member arrangement according to the invention. The heat exchanger comprises in conventional manner a
cylindrical shell 1; two bonnets 2 and 3 fixed to the shell by means offlange joints 5; two tube sheets 7, 8, the planes of which are perpendicular to the axis of theshell 1 and which are disposed at each end of the shell; tubes 9 fixed in holes in the tube sheets and extending between the tube sheets parallel to the axis of the shell;baffles inlet 15 at the top of theshell 1 at one side thereof for supplying a first heat exchanger fluid; anoutlet 17 at the bottom of the shell at the other side thereof for evacuating the first heat exchanger fluid; aninlet 19 centrally disposed in the bonnet 3 for supplying a second heat exchanger fluid to pass through a first set of tubes 9 to the space inwardly of the bonnet 2; and an outlet 21 disposed at the bottom of the bonnet 3 for evacuating the second heat exchanger fluid after it has been recycled through a second set of tubes 9 to the space inwardly of the bonnet 3. At their peripheral outer edges, the tube sheets 7 and 8 are flexibly fixed to theshell 1 by means of special connectingmembers 23, which will be described in more detail below with reference to Figs 2-9. - The
central baffle 12 is fixed to the shell, and the tubes 9 in turn are fixed to thebaffle 12 at the point where they pass through it. Thebaffles baffle 12 by means ofspacer rods 25, but are movable relative to the shell. The tubes 9 pass through holes in thebaffles baffles baffles shell 1 that the first heat exchanger fluid is caused to follow an alternating downward and upward flow path about the tubes 9, as indicated by thearrows 27. - The second heat exchanger fluid is supplied to the first limited set of tubes 9 from the
inlet 19 by means of atubular duct 26. This consists of twotelescopic tube parts part 29 is connected to theinlet 19, and thepart 30 is connected to the tube sheet, around the associated tubes. Thepart 29 can be displaced within thepart 30 in connection with thermally-conditioned displacements of the tube sheet 8, a seal 31 ensuring adequate sealing with respect to the space inwardly of the bonnet 3. It is understood that the seal 31 may be a simple gland-type seal, since the pressure exerted across it does not exceed the pressure drop of the second heat exchanger fluid during its passage through the tubes 9. The flow path of the second heat exchanger fluid is indicated by thearrows 28. - The inventive flexible connection of the tube sheets 7, 8 to the
shell 1 by means of the connectingmember 23 appears more clearly from Figs 2-9 drawn on a larger scale. In these Figures, the same reference numerals as in Fig. 1 are used for the same or equivalent constructional elements. - Figs 2-9 all schematically illustrate the provision of a metallic, shell-like connecting
member 23, viz. in an enlarged partial section taken along a diameter, parallel to the axis of theshell 1. In other words, the section is taken at right angles to the centre axis of the connectingmember 23 designed as a shell portion of an annular toroid. - In Fig. 2, the connecting
member 23 is a thin membrane shell of metal having the cross-sectional shape of a quarter circle, i.e. a 90° circular arc (in the unloaded state). The edges of the membrane shell are extended and fixed to the lower, i.e. "outer" edge surface 31 (in the Figure) of the tube sheet 8 and to the inner surface of theshell 1. Said edges are connected tangentially both to the inner surface of theshell 1 and to the tube sheet 8. Here, as in the other embodiments, the connection is performed by welding, as shown in the respective Figures. In this case, the membrane shell is located below the plane of the tube sheet 8, i.e. on the outside thereof. An "external" pressure exerted from one side is readily taken up as membrane stresses, as indicated by arrows 33. However, an "internal" pressure from one side can just as easily be taken up as membrane stresses thanks to the configuration of the membrane shell. - In the embodiment of Fig. 3, the membrane shell is connected orthogonally both to the tube sheet 8 and to the
shell 1, and the extended fixingportion 37 of themembrane shell 23 is connected tangentially to ashell flange 5 and provided with agasket 39 on its underside. Moreover, the fixing portion of the membrane shell at the tube sheet 8 is extended so as to project on the opposite side of the tube sheet 8. The thus projectingportion 35 has been found to improve the mounting strength and stability. As shown in the Figure, themembrane shell 23 and theextended portion 35 thereof are welded to the edge of the tube sheet 8 at its upper and lower side, respectively. An "internal" pressure exerted from one side is indicated byarrows 34. - Fig. 4 shows an embodiment of the same general type as that in Fig. 2, but the connecting
member 23 here is a continuous extension of the tube sheet 8. This extension has a reduced wall thickness and protrudes from the upper side (i.e. "inner side") of the tube sheet 8. Thefree end surface 41 of the tube sheet is concave in conformity with the curvature of themembrane shell 23 so as to provide a smooth transition. In this manner, it is possible to avoid detrimental stress concentrations. For the same purpose, the opposite end of themembrane shell 23, which is welded to theshell 1, is thickened by the curvature of the membrane shell continuing a slight distance after the 90° arc. The weld joint 43 is located in the plane of the inner wall of theshell 1. - Fig. 5 shows an embodiment which is analogous with that of Fig. 2, although it is here a matter of an "internal" pressure exerted from one side. The curvature or arch of the
membrane shell 23 thus is reversed, facing downwards, i.e. outwards. Also in this embodiment, the pressure thus acts within the concave, arched membrane shell to achieve the optimum membrane stress effect. It should however be emphasised that the membrane shell according to the invention can also take up pressure exerted only from the opposite, convex side. - The connecting
member 23 here is a continuous extension of theshell 1. The transition to theshell 1 is designed in the same way as the transition to the tube sheet 8 in Fig. 4. At the tube sheet 8, themembrane shell 23 is welded to the lower part of the end edge surface. Theend edge surface 45 otherwise is concave with a smooth transition from the curvature of themembrane shell 23, whereby to avoid detrimental stress concentrations. - Fig. 6 shows an embodiment which is analogous with that of Fig. 1, although modified in two respects. First, the
membrane shell 23 is welded to the lower part of the end edge surface of the tube sheet (as in Fig. 5), and the end edge surface is formed with a continuously connected,circumferential groove 47. Second, an annularcylindrical stiffening ring 49 is rigidly mounted (in this case welded) on the upper side of the tube sheet 8 directly at the circumferential edge of the sheet. Thering 49 projects inwards, i.e. in the opposite direction with respect to themembrane shell 23, orthogonally to the tube sheet 8. - Fig. 7 shows an embodiment which is analogous (although reversed) with respect to that of Fig. 3. It is however intended for "internal" pressure and includes a
stiffening ring 49 as in Fig. 6. In this case, the stiffening ring is however resiliently mounted by being welded to the projectingportion 35 of themembrane shell 23. Further, acircumferential groove 51 eliminating stress concentrations is provided on the underside of the tube sheet 8 in the immediate vicinity of theweld 53 between the tube sheet 8 and themembrane shell 23. Thegroove 51 and theweld 53 provide a smooth, curved transition between themembrane shell 23 and the tube sheet 8. - Fig. 8 shows an embodiment which is analogous with that of Fig. 5, but, additionally, provided with a
stiffening ring 49, as in Fig. 6. - Fig. 9, finally, shows an embodiment in which the
membrane shell 23 is tangentially connected by welding to theshell 1 at one end, while its other end is welded to thefree end surface 55 of a fixedstiffening ring 49 projecting downwards from the lower edge portion of the tube sheet 8. The ring does not project at right angles from the tube sheet, but obliquely inwardly towards the centre of the heat exchanger, i.e. away from theshell 1. Thelowermost portion 57 of the ring is bent backwards so as to be perpendicular to the plane of the tube sheet 8. An annularconcave groove 59 is connected to the upper weld between themembrane shell 23 and thering portion 57, whereby to avoid detrimental stress concentrations. As is readily appreciated, this arrangement means that thegap 61 between theshell 1 and the edge of the tube sheet 8 can be reduced, thus improving the utilisation of the interior of the heat exchanger. - The heat exchanger shown in Fig. 1 uses two movable tube sheets, which entails a horizontal heat exchanger, as well as the illustrated, preferred arrangement of the baffles. Other embodiments are however conceivable within the scope of the inventive concept. Thus, it is possible to provide one stationary and one movable tube sheet, in which case the heat exchanger can be arranged vertically with the tubes hanging or standing in the stationary tube sheet. Movable baffles are then mounted in conventional manner by means of spacer members in the stationary tube sheet.
Claims (9)
- A heat exchanger having a heat exchanger vessel with a shell (1) and, disposed inside the shell, at least one tube sheet (7, 8) to which a number of heat exchanger tubes (9) are connected and whose edge portion is sealingly connected to the shell (1) by means of a flexible connecting member (23), such that thermal expansion between the shell (1) and the tube sheet (7, 8) can be taken up as bending of the connecting member which is designed as part of a toroid having a cross-section of arched configuration, characterised in that the connecting member (23) is in the form of a thin membrane shell of metallic material and of continuous curvature, which has substantially the shape of a quarter circle, at least in the unloaded state, such that loads deriving from pressure differences across the connecting member (23) can be taken up as general membrane stresses in the connecting member.
- A heat exchanger as claimed in claim 1, charac erised in that the connecting member (23) is connected to the edges of the shell (1) and to a flange joint (5) of the tube sheet (8).
- A heat exchanger as claimed in claim 2, charac terised in that the connecting member (23) is connected to an edge surface (31) of the tube sheet (8), the connecting member being extended (35) so as to project on the opposite side of said edge surface with respect to the main extent of the connecting member.
- A heat exchanger as claimed in claim 1, charac terised in that the connecting member (23) is connected to the inner surface of the shell (1) and to the lower edge surface (31) of the tube sheet (8).
- A heat exchanger as claimed in claim 4, charac terised in that the connecting member is a continuous extension of the shell wall (1).
- A heat exchanger as claimed in claim 4, char acterised in that the connecting member is a continuous extension of the tube sheet.
- A heat exchanger as claimed in any one of the preceding claims, characterised in that an annular or flange-shaped stiffening means (49) is fixed at the edge portion of the tube sheet (8).
- A heat exchanger as claimed in claim 7, charac terised in that said stiffening means (49) is elastically fixed to the tube sheet (8).
- A heat exchanger as claimed in claims 3 and 8, characterised in that said stiffening means (49) is fixed to the extended portion (35) of the connecting member (23).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8803537A SE462815B (en) | 1988-10-05 | 1988-10-05 | DEVICE FOR HEAT EXCHANGER, WHICH HAS A TUBPLATE THAT SEALS THE CONNECTOR TO AN OUTER COAT WITH A FLEXIBLE CONNECTING ELEMENT WHICH SECTIONAL SECTION IS ESSENTIALLY THE FORM OF A QUARTER CIRCLE |
PCT/SE1990/000225 WO1991015728A1 (en) | 1988-10-05 | 1990-04-04 | Unloaded heat exchanger tube sheet |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0523039A1 EP0523039A1 (en) | 1993-01-20 |
EP0523039B1 true EP0523039B1 (en) | 1995-03-01 |
Family
ID=20373532
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90908144A Expired - Lifetime EP0523039B1 (en) | 1988-10-05 | 1990-04-04 | Unloaded heat exchanger tube sheet |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0523039B1 (en) |
DE (1) | DE69017472T2 (en) |
ES (1) | ES2068387T3 (en) |
SE (1) | SE462815B (en) |
WO (1) | WO1991015728A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE462815B (en) * | 1988-10-05 | 1990-09-03 | Sune Malm | DEVICE FOR HEAT EXCHANGER, WHICH HAS A TUBPLATE THAT SEALS THE CONNECTOR TO AN OUTER COAT WITH A FLEXIBLE CONNECTING ELEMENT WHICH SECTIONAL SECTION IS ESSENTIALLY THE FORM OF A QUARTER CIRCLE |
DE4142375A1 (en) * | 1991-12-20 | 1993-07-08 | Siemens Ag | COOLING AIR COOLER FOR GAS TURBINES |
FR2772468B1 (en) * | 1997-12-17 | 2000-03-03 | Packinox Sa | PLATE HEAT EXCHANGER |
DE102005037156A1 (en) * | 2005-08-06 | 2007-02-08 | Daimlerchrysler Ag | heat exchangers |
DE102006042936A1 (en) * | 2006-09-13 | 2008-03-27 | Modine Manufacturing Co., Racine | Heat exchanger, in particular exhaust gas heat exchanger |
DE102011018846A1 (en) * | 2011-01-19 | 2012-07-19 | GETAS GESELLSCHAFT FüR THERMODYNAMISCHE ANTRIEBSSYSTEME MBH | Axial piston motor and method for operating an axial piston motor |
DE102015014446A1 (en) * | 2015-11-07 | 2017-05-11 | Linde Aktiengesellschaft | heat exchangers |
DE102016200634A1 (en) * | 2016-01-19 | 2017-07-20 | Mahle International Gmbh | Heat exchanger |
CN114234701A (en) * | 2021-12-31 | 2022-03-25 | 河南恒天久大实业有限公司 | Heat exchanger with telescopic tube plate |
CN114189174B (en) * | 2022-02-15 | 2022-05-13 | 四川大学 | Thermoelectric conversion device and system |
CN115013195A (en) * | 2022-06-30 | 2022-09-06 | 东风马勒热系统有限公司 | Exhaust gas recirculation cooler adopting split type air outlet main sheet |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE179852C1 (en) * | 1962-01-01 | |||
US1876401A (en) * | 1932-09-06 | chatfield | ||
US1740318A (en) * | 1927-12-24 | 1929-12-17 | Gen Electric | Condenser boiler |
US1831454A (en) * | 1930-08-15 | 1931-11-10 | Ingersoll Rand Co | Condenser |
US2152266A (en) * | 1937-05-14 | 1939-03-28 | Andale Co | Heat exchange equipment |
DE1013676B (en) * | 1953-05-11 | 1957-08-14 | Metallgesellschaft Ag | Radiator |
FR1211918A (en) * | 1957-12-23 | 1960-03-18 | Foster Wheeler Ltd | advanced heat exchangers |
FR1370042A (en) * | 1963-06-17 | 1964-08-21 | Parsons C A & Co Ltd | Improvements to tubular heat exchangers |
BE758439A (en) * | 1969-11-14 | 1971-04-16 | Snecma | PLATE HEAT EXCHANGER |
CH545665A (en) * | 1972-05-05 | 1974-02-15 | ||
FR2415790A1 (en) * | 1978-01-27 | 1979-08-24 | Westinghouse Electric Corp | Heat exchanger with outer chamber and inner tubes - joined by a tube plate with a flexible part to reduce thermal stresses |
SE462815B (en) * | 1988-10-05 | 1990-09-03 | Sune Malm | DEVICE FOR HEAT EXCHANGER, WHICH HAS A TUBPLATE THAT SEALS THE CONNECTOR TO AN OUTER COAT WITH A FLEXIBLE CONNECTING ELEMENT WHICH SECTIONAL SECTION IS ESSENTIALLY THE FORM OF A QUARTER CIRCLE |
-
1988
- 1988-10-05 SE SE8803537A patent/SE462815B/en not_active IP Right Cessation
-
1990
- 1990-04-04 DE DE69017472T patent/DE69017472T2/en not_active Expired - Fee Related
- 1990-04-04 ES ES90908144T patent/ES2068387T3/en not_active Expired - Lifetime
- 1990-04-04 EP EP90908144A patent/EP0523039B1/en not_active Expired - Lifetime
- 1990-04-04 WO PCT/SE1990/000225 patent/WO1991015728A1/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
ES2068387T3 (en) | 1995-04-16 |
DE69017472D1 (en) | 1995-04-06 |
WO1991015728A1 (en) | 1991-10-17 |
SE8803537L (en) | 1990-04-06 |
DE69017472T2 (en) | 1995-08-31 |
SE462815B (en) | 1990-09-03 |
SE8803537D0 (en) | 1988-10-05 |
EP0523039A1 (en) | 1993-01-20 |
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