EP2972042A1 - Faisceau de tubes pour échangeur de chaleur à calandre et son procédé de fabrication - Google Patents

Faisceau de tubes pour échangeur de chaleur à calandre et son procédé de fabrication

Info

Publication number
EP2972042A1
EP2972042A1 EP14775905.4A EP14775905A EP2972042A1 EP 2972042 A1 EP2972042 A1 EP 2972042A1 EP 14775905 A EP14775905 A EP 14775905A EP 2972042 A1 EP2972042 A1 EP 2972042A1
Authority
EP
European Patent Office
Prior art keywords
tube
tubes
shell
tube bundle
baffles
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.)
Withdrawn
Application number
EP14775905.4A
Other languages
German (de)
English (en)
Other versions
EP2972042A4 (fr
Inventor
Blazo LJUBICIC
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koch Heat Transfer Co LP
Original Assignee
Koch Heat Transfer Co LP
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Koch Heat Transfer Co LP filed Critical Koch Heat Transfer Co LP
Publication of EP2972042A1 publication Critical patent/EP2972042A1/fr
Publication of EP2972042A4 publication Critical patent/EP2972042A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/06—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • F28D7/1684—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation the conduits having a non-circular cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/025—Tubular elements of cross-section which is non-circular with variable shape, e.g. with modified tube ends, with different geometrical features
    • 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
    • F28F2009/222—Particular guide plates, baffles or deflectors, e.g. having particular orientation relative to an elongated casing or conduit
    • F28F2009/226—Transversal partitions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making

Definitions

  • the present invention relates generally to shell-and-tube type heat exchangers and, more particularly, to the tube bundles used in such heat exchangers and methods for the assembly and use thereof.
  • Shell-and-tube heat exchangers are used in a wide variety of applications to cause heat exchange between fluid streams.
  • a first fluid referred to as the tube-side fluid is directed through elongated tubes in a tube bundle that is housed within a shell that is typically of cylindrical shape.
  • a large number of the tubes are included in the tube bundle and they extend in parallel and spaced-apart relationship to each other.
  • the tubes are fixed at their opposite ends to generally planar header plates that are also known as tube sheets.
  • a second fluid commonly referred to as the shell-side fluid, flows within the shell in the open space surrounding the tubes and undergoes heat exchange with the first fluid stream flowing within the tubes.
  • Shell-and-tube heat exchangers are constructed in different known ways to provide the desired flow arrangement between the tube-side fluid and the shell-side fluid.
  • straight tubes are used and the inlet and outlet nozzles for the tube-side fluid stream are located at opposite ends of the heat exchanger.
  • the inlet and outlet nozzles for the shell-side fluid are likewise located at opposite ends of the heat exchanger.
  • the flow of the fluid streams in such an arrangement can be either co-current or counter-current.
  • the inlet nozzles for both the tube-side fluid and the shell- side fluid are located at the same end of the heat exchanger and the outlet nozzles for the fluids are located at the opposite end of the heat exchanger.
  • the tube-side and shell-side fluids then enter at the same end of the heat exchanger, flow along its length, and exit at the opposite end of the heat exchanger.
  • the inlet nozzles for the fluids are located at opposite ends of the heat exchanger and the outlet nozzles are likewise located at opposite ends of the heat exchanger.
  • the fluids then enter at opposite ends of the heat exchanger, flow in opposite directions along its length, and exit at opposite ends of the heat exchanger.
  • U-shaped tubes are used instead of straight tubes and the inlet and outlet nozzles for the tube-side fluid are located at the same end of the heat exchanger.
  • the tube-side fluid flows along one leg of each U-shaped tube and then reverses direction and flows back along the other leg of the U-shaped tube.
  • the inlet and outlet nozzles for the shell-side fluid in this arrangement can both be located at the same end of the heat exchanger as the inlet and outlet nozzles for the tube-side fluid, in which case a longitudinal baffle is positioned between the legs of the U-shaped tubes to create a divided flow path that allows the shell-side fluid on one side of the longitudinal baffle to flow in one direction before reversing and flowing in the opposite direction along the other side of the longitudinal baffle.
  • the inlet and outlet nozzles for the shell-side fluid can be located at opposite ends of the shell so that the shell-side fluid flows in only one direction along the length of the heat exchanger.
  • Other multiple-pass shell and multiple-pass tube arrangements are used conventionally and are further defined in the Standards of the Tubular Exchanger Manufacturers Association, which is incorporated by reference herein in its entirety.
  • the tubes in the tube bundle pass through baffles that are spaced apart along the longitudinal length of the tube bundle to provide structural support for the tubes and thereby reduce sagging and vibration of the tubes.
  • Each baffle also serve to divert the flow of the shell-side fluid so that it is forced to flow across rather than along the tubes to achieve better heat transfer with the tube-side fluid.
  • the baffles are typically in the form of single or double segmental cut baffles in which a quadrant or other region of the baffle is open to allow the passage of the shell-side fluid or disc and donut baffles in which the shell-side fluid flows through the annular region surrounding the disc baffles and through the center openings of the donut baffles.
  • tie rods are typically welded to the baffles to form a cage-like structure in which the baffles are fixed in spaced apart relationship.
  • the rotational orientation of each baffle is set so that the holes in the baffles through which the tubes are inserted are in longitudinal alignment. Because the holes are only slight larger than the tubes to reduce fluid leakage through the holes, the longitudinal alignment of the holes must be within tight tolerances.
  • the tube sheets in conventional shell-and-tube heat exchangers are normally formed of high-strength metal or metal alloy and have a thickness much greater than that of shell to withstand the operating pressures within the heat exchanger and to compensate for structural weakness created by the large number of holes that receive the tubes in the tube sheets.
  • Fabrication of the tube sheets is a time-intensive process as the holes must typically be individually drilled through the thickness of the tube sheets. The drilling operating creates holes that are circular in cross section, thereby limiting the tubes to those having the same circular cross section.
  • the present invention is directed to a tube bundle for use in a shell-and- tube heat exchanger.
  • the tube bundle includes a plurality of hollow, elongated tubes extending in parallel and spaced-apart relationship to each other in a preselected pattern, each of the tubes having a first end for entry of a first fluid for flow within the tube along a longitudinal length of the tube and an opposite second end for the first fluid to exit the tube and an intermediate portion between the first and second ends.
  • the intermediate portion of each tube has a cross section in the form of a flattened circle.
  • the flattened circle has one axis of symmetry.
  • the flattened circle has two axes of symmetry, with one axis being shorter than the other.
  • the tube bundle also includes a first tube sheet having holes into which the first ends of the tubes extend and are secured and a plurality of baffles positioned at spaced apart positions along the longitudinal length of the tubes for supporting the tubes and guiding flow of a second fluid exteriorly of said tubes.
  • Each of the baffles has a cutout for passage of fluid and a plurality of openings through which at least some of said tubes are inserted.
  • the cutouts of adjacent ones of the baffles are rotationally offset around a center longitudinal axis of said tube bundle.
  • the intermediate portion of each tube is at least a majority of the longitudinal length of each tube, at least 75% of the length of each tube, at least 90% of the length of each tube, or at least 95% of the length of each tube.
  • the first and second ends of the tubes have a circular cross section with the diameter of the second end being less than that of the first end and being the same or less than the length of the shorter axis of symmetry of the intermediate portion of each tube.
  • the invention is directed to a shell-and-tube heat exchanger in which is positioned a tube bundle as described above.
  • the invention is directed to a method of assembling the tube sheet described above.
  • the assembly method includes the steps of providing the first and second ends of the tubes with a circular cross section and providing the second end with a diameter that is less than the length of said shorter axis of symmetry of the intermediate portion of the tube.
  • the assembly method further includes spacing the baffles apart from each other a desired preselected distance with their openings in alignment, fixing tie-rods to the baffles to secure the baffles in their spaced-apart and rotational relationship to each other, inserting the second end of each tube through the aligned openings in each of the baffles, fixing the first ends of each tube in holes in the first tube sheet, and fixing the second ends of each tube in other holes in the first tube sheet or a second tube sheet.
  • FIG. 1 is a perspective view from one end of a heat exchanger made in accordance with one embodiment of the present invention, with portions of a shell of the heat exchanger broken away to show an internal tube bundle;
  • FIG. 2 is a perspective view of the heat exchanger shown in Fig. 1 taken from the opposite end;
  • FIG. 3 is an enlarged fragmentary perspective view of the heat exchanger showing an end portion of the tube bundle
  • Fig. 4 is an enlarged fragmentary perspective view illustrating the process of assembling the tube bundle by inserting the individual tubes through the openings in the baffles;
  • Fig.5 is a side elevation view of the heat exchanger taken in vertical section
  • Fig. 6 is an enlarged fragmentary end elevation view taken in vertical section along line 6-6 in Fig. 5 to show the tubes and tie-rod inserted through a portion of one of the baffles;
  • FIG. 7 is a fragmentary end elevation view of one of the tubes
  • FIG. 8 is an elevation view taken from one end of the tube shown in Fig. 7;
  • Fig. 9 is an elevation view taken from the opposite end of the tube.
  • Fig. 10 is an illustration of the variables used in the calculation of the elliptical cross section of a portion of the tube.
  • Heat exchanger 10 is a shell-and-tube heat exchanger and includes an elongated shell 12 having a front end 14, an opposed end 16, and an open interior volume 18.
  • the shell 12 is of a generally cylindrical configuration, although other shapes can be used.
  • the shell 12 is formed of a metal, polymer or other material that is generally inert to the fluid within the shell 12 and is able to withstand the pressures and temperatures within the shell 12 during operation of the heat exchanger 10.
  • An inlet nozzle 20 extends from the shell 12 at the front end 14 for introducing a shell-side fluid into an interior volume 18 of the shell 12.
  • An outlet nozzle 22 extends from the shell 12 for removing the shell-side fluid from the interior volume 18 of the shell 12.
  • the outlet nozzle 22 is positioned at the opposite end 16 of the shell 12 from the front end 14 at which the inlet nozzle 20 is positioned.
  • the outlet nozzle 22 is positioned at the front end 14 with the inlet nozzle 20 and a longitudinally-extending baffle (not shown) is positioned within the interior volume 18 of the shell 12.
  • the longitudinally- extending baffle forces the shell-side fluid to flow from the inlet nozzle 20 to the opposite end 16 of the shell 12 before reversing direction to flow on the opposite side of the baffle back to the front end 14 where it exits the interior volume 18 of the shell 12 through the outlet nozzle 22.
  • the inlet nozzle 20 and the outlet nozzle 22 typically extend radially from the shell 12, but they may extend from the shell 12 in other orientations, such as tangentially.
  • an inlet channel or head 24 defining an interior plenum 25 and having an inlet nozzle 26 for the tube-side fluid is positioned to close the open front end 14 of the shell 12.
  • An outlet channel or head 28 defining an interior plenum 29 and having an outlet nozzle 30 for the tube-side fluid is positioned to close the open end 16 of the shell 12.
  • the inlet head 24 and outlet head 28 are both positioned at the front end 14 of the shell 12 and the other end 16 of the shell is closed.
  • the inlet nozzle 26 and outlet nozzle 30 extend along the longitudinal center axis of the shell 12 in the illustrated embodiment, but they may extend in other orientations, such as perpendicularly to the longitudinal center axis of the shell 12.
  • a tube bundle 32 is positioned in the open interior volume 18 of the shell 12 and comprises a plurality of hollow, elongated tubes 34 that extend in a parallel and spaced-apart relationship to each other and are positioned in a preselected pattern.
  • Each of the tubes 34 has an open first end 36 for entry of a tube-side fluid for flow within the tube 34 along a longitudinal length of the tube 34 and an opposite open second end 38 for the first fluid to exit the tube 34.
  • the tubes 34 are formed from thermally-conductive, corrosion-resistant materials, such as various metals, including copper alloy, stainless steel, carbon steel, non-ferrous copper alloy, Inconel alloys, nickel, Hastelloy alloys, and titanium.
  • the tube bundle 32 includes a plurality of plate-like baffles 40 positioned at spaced apart positions along the longitudinal length of the tubes 34.
  • the baffles 40 function to redirect the flow of the shell-side fluid as it flows exteriorly of the tubes 34.
  • the baffles 40 also serve to support and maintain the desired positioning of the tubes 34.
  • each of the baffles 40 has individual openings 42 through which the tubes 34 extend.
  • the openings 42 are sized slightly larger than the tubes 34 to permit the tubes 34 to be longitudinally inserted through the openings 42 while minimizing the amount of the shell-side fluid that can pass through the openings 42.
  • the baffles 40 are formed as incomplete discs and are sized so that their outer perimeters contact or are closely spaced from the inner surface of the shell 12. When the baffles 40 are positioned perpendicularly to the center longitudinal axis of the shell, the baffles 40 may be formed as incomplete circular discs. When the baffles 40 are inclined from the perpendicular, the baffles 40 may be formed as incomplete elliptical discs.
  • the baffles 40 are referred to as incomplete discs because they each include a cutout 44 that allows for the passage of the shell- side fluid through the baffle 40.
  • the cutout 44 in one embodiment intersects the outer perimeter of the baffle 40.
  • the cutout 44 may be formed as a sector, segment or other portion of the baffle 40.
  • the cutout 44 is a sector having an angle of between 45 and 270 degrees, between 75 and 240 degrees, between 85 and 230 degrees, 90 degrees, 135 degrees, or 180 degrees.
  • the cutouts 44 in adjacent baffles 40 are rotationally or otherwise offset from each other about the longitudinal center axis of the shell 12 to create the desired flow path of the shell- side fluid as it flows within the interior volume 18 of the shell 12 from the inlet nozzle 26 to the outlet nozzle 30.
  • the cutouts 44 in the baffles 40 are hemispheres and the cutouts 44 in adjacent baffles 40 are rotated 180 degrees from each other to create a sinusoidal flow path for the shell-side fluid.
  • the cutouts 44 in the baffles 40 are quadrants and the cutouts 44 in adjacent baffles 40 are rotated 90 degrees from each other to cause create a spiral flow of the shell-side fluid.
  • the tube bundle 32 may include tie rods 46 that extend longitudinally through and are fixed to the perimeter regions of the baffles 40 to secure the baffles 40 at the desired longitudinal spacing and rotational orientation.
  • the number of tie rods 46 can be varied as needed. In one embodiment, between four and twenty-four tie rods 46 are evenly spaced about the perimeter of the baffles 40.
  • the tube bundle 32 includes at least one tube sheet 48 that is positioned at the front end 14 of the shell 12 and separates the open interior volume 18 of the shell 12 from the interior plenum 25 of the inlet head 24.
  • the tube sheet 48 is normally disc-shaped with a perimeter that seals against the inner surface of the shell 12 in a conventional fashion. As best shown in Fig. 5, the tube sheet 48 includes a plurality of holes 49 that extend completely through the thickness of the tube sheet 48 between its opposing faces.
  • the first ends 36 of the tubes 34 are inserted into and secured within the holes 49 of the tube sheet 48. If the tubes 34 are U-shaped, the second ends 38 of the tubes 34 are inserted into and secured within other holes 49 of the tube sheet 48.
  • a second tube sheet 50 is positioned at the opposite end 16 of the shell 12 and separates the open interior volume 18 of the shell 12 from the interior plenum 29 of the outlet head 28.
  • the second ends 38 of the tubes 34 are inserted into and secured within the holes 49 that extend through the second tube sheet 50.
  • the first and second ends 36 and 38 of the tubes 34 are received within sleeves 51 fitted into the holes 49 in the tube sheets 48 and 50.
  • each of the tube sheets 48 and 50 is formed of a high-strength metal or metal alloy and has a thickness of between two and ten inches. Because of the hardness and thickness of the material used for the tube sheets 48 and 50, the holes 49 in one embodiment of the tube sheets 48 and 50 are circular in cross section and are formed in a drilling operation.
  • an intermediate portion 52 of each tube 34 between the first and second ends 36 and 38 of the tube 34 has a cross section in the form of a flattened circle.
  • the flattened circle has two axes of symmetry that extend at right angles to each other, with one axis being shorter than the other, to form geometric shapes such as elliptical or obround for the cross section of the tube 34.
  • the flattened circle has only one axis of symmetry to form a geometric shape such as oval or egg- shaped for the cross section of the tube 34.
  • the tube 34 has a longer axis 54 of a preselected length at the widest part of the cross section of the tube 34 and a perpendicular shorter axis 56 at the narrowest part of the cross section of the tube 34.
  • the cross section of the tube 34 is elliptical and the radii ri and r 2 are co-linear at points Pi and P 2 of tangency of the two curves.
  • radius rj intersects the longer elliptical axis "a" at focal points Qi and Q 2 , which is also the center point for the radius r 2 .
  • the ratio of the shorter elliptical axis "b" to the longer elliptical axis "a” is in the range of 0.22 ⁇ b/a ⁇ 0.92.
  • the intermediate portion 52 of each tube 34 comprises at least a majority of the longitudinal length of each tube 26, at least 75% of the length of each tube 34, at least 90% of the length of each tube 34, or at least 95% of the length of each tube 34.
  • the first end 36 of each tube 34 is of a circular cross section with a diameter that is greater than that of the second end 36.
  • the diameter of the first end 36 of each tube 34 is also greater than that of the length of the minor axis 56 (Fig. 10) of the cross section of the intermediate portion 52 of the tube 34 and is less than the length of the longer axis 54 (Fig. 10) of each tube 34.
  • the second end 38 of each tube 34 also has a circular cross section with a diameter that is the same as or slightly less than the length of the minor axis 56 (Fig. 10) of the cross section of the intermediate portion 52 of the tube 34.
  • Each tube 34 can be fabricated from stock having a circular cross section with a diameter that is the same as that of the first end 36.
  • the tube 34 is then flattened by one or more series of rollers to form the desired geometric shape for the cross section of the intermediate portion 52.
  • the second end 38 is then formed by coning tools to achieve a circular cross section with a smaller diameter.
  • each tube 34 includes a transition segment 58 between the first end 36 and the intermediate portion 52 and a similar transition segment 60 between the second end 38 and intermediate portion 52.
  • the tubes 34 may either be bare or they may have extended or enhanced internal and/or external surfaces. In one embodiment, the extended surfaces are fins (not shown) that extend longitudinally along the tubes 34.
  • the openings 42 in the baffles 40 have the same elliptical, obround, oval, egg-shaped or other geometric shape as the cross-sectional shape of the intermediate portion 52 of the tubes 34.
  • the openings 42 are slightly larger than the intermediate portion 52 of the tubes 34 so that the tubes 34 can be inserted through and maintain a tight fit within the openings 42 to reduce the amount of shell-side fluid that can pass through the openings 42.
  • the openings 42 are approximately 0.4 mm larger than the outer dimension of the tubes 34.
  • the openings 42 can be arranged with their longer axes extending vertically, horizontally, or an orientation between vertical and horizontal.
  • the openings 42 may each be oriented in the same direction or they may be independently oriented.
  • the openings 42 in the baffles 40 are arranged to place the tubes 34 in a preselected pattern, such as a square, rectangular, or triangular pitch.
  • the openings 42 in the baffles 40 are arranged to place the tubes 34 in a series of concentric circles with the longer axis 56 of each tube 34 extending tangentially to the associated circle.
  • each tie-rod 46 may be screwed into a threaded hole (not shown) in one of the tube sheets 48 and 50 and the other end of the tie-rod 46 is fixed to the last baffle 40 at the opposite end of the tube bundle 32.
  • the smaller-diameter, second end 38 of each tube 34 is inserted through one of the holes 49 in the tube sheet 48 and moved longitudinally the second end 38 passes through one of the openings 42 in the first baffle 40 at one end of the tube bundle 32.
  • the tube 34 is then rotated as needed to align the longer and shorter axes 54 and 56 of the intermediate portion 52 of the tube 34 with the corresponding axes of the opening 42 in the end baffle 40.
  • the tube 34 is then fed through the aligned openings 42 in the successive baffles 40 until the first end 36 of the tube 34 passes through the last baffle 40 at the opposite end of the tube bundle 32 and is seated within one of the holes 49 in the other tube sheet 50.
  • the remaining tubes 34 are inserted in the same fashion through the holes 49 in the tube sheet 48, the openings 42 in each of the baffles 40, and the holes 49 in the other tube sheet 50.
  • the first and second ends 36 and 38 of the tubes 34 in one embodiment slightly protrude beyond the tube sheets 48 and 50 are then fixed to the tube sheets 48 and 50, such as by expanding and welding to the tube sheets 48 and 50.
  • the assembled tube bundle 32 is then inserted within the shell 12 of the heat exchanger 10 in a conventional fashion.
  • the shell-side fluid is introduced through the inlet nozzle 20 into the interior volume 18 within the shell 12 of the heat exchanger 10.
  • the shell-side fluid travels through a sinusoidal path as it travels along the length of the shell and navigates through the cutouts 44 in the baffles 40.
  • the shell-side fluid is then removed from the interior volume 18 of the shell 12 through the outlet nozzle 22.
  • the tube-side fluid is introduced through the inlet nozzle 26 into the interior plenum 25 of the inlet head 24.
  • the tube-side fluid is then distributed to the first ends 36 of the tubes 34 and flows along the length of the tubes 34 before exiting the second ends 38 of the tubes 34.
  • the tube-side fluid then enters the interior plenum 29 of the outlet head 28 before exiting the heat exchanger 10 through the outlet nozzle 30.
  • the non-circular intermediate portion 52 of the tubes 34 in the tube bundle 32 provides higher tube-side and shell-side heat transfer coefficients than conventional round tubes because the flattened circle cross section of the intermediate portion 52 of the tubes 34 has a greater surface area than the round cross section of the tubes 34 from which the intermediate portion 52 was formed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

La présente invention concerne un faisceau de tubes pour un échangeur de chaleur à calandre. Le faisceau de tubes comprend une pluralité de tubes allongés, chacun d'eux ayant une partie intermédiaire qui a une section transversale sous la forme d'un cercle aplati ayant au moins un axe de symétrie. Les extrémités des tubes peuvent avoir une section transversale circulaire, le diamètre de l'une des extrémités circulaires étant inférieur à celui de l'autre extrémité et également inférieur à la longueur d'un axe de symétrie plus court de la partie intermédiaire du tube. Cette construction de tube permet au faisceau de tubes d'être assemblé en insérant l'extrémité de petit diamètre du tube à travers les ouvertures alignées dans les déflecteurs espacés dans le faisceau de tubes. La section transversale non circulaire de la partie intermédiaire des tubes augmente les coefficients de transfert de chaleur côté tube et côté enveloppe.
EP14775905.4A 2013-03-14 2014-02-03 Faisceau de tubes pour échangeur de chaleur à calandre et son procédé de fabrication Withdrawn EP2972042A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13/827,984 US20140262171A1 (en) 2013-03-14 2013-03-14 Tube bundle for shell-and-tube heat exchanger and method of constructing same
PCT/US2014/014462 WO2014158350A1 (fr) 2013-03-14 2014-02-03 Faisceau de tubes pour échangeur de chaleur à calandre et son procédé de fabrication

Publications (2)

Publication Number Publication Date
EP2972042A1 true EP2972042A1 (fr) 2016-01-20
EP2972042A4 EP2972042A4 (fr) 2016-12-14

Family

ID=51522224

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14775905.4A Withdrawn EP2972042A4 (fr) 2013-03-14 2014-02-03 Faisceau de tubes pour échangeur de chaleur à calandre et son procédé de fabrication

Country Status (7)

Country Link
US (1) US20140262171A1 (fr)
EP (1) EP2972042A4 (fr)
KR (1) KR20150126676A (fr)
CN (1) CN105209843A (fr)
CA (1) CA2904727A1 (fr)
HK (1) HK1216662A1 (fr)
WO (1) WO2014158350A1 (fr)

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EP3851782A1 (fr) 2016-10-07 2021-07-21 Hamilton Sundstrand Corporation Échangeurs de chaleur
CN107186471B (zh) * 2017-04-28 2020-04-03 上海森松压力容器有限公司 一种换热器管束的组装方法
US20180372413A1 (en) 2017-06-22 2018-12-27 Rheem Manufacturing Company Heat Exchanger Tubes And Tube Assembly Configurations
CN109959275B (zh) * 2017-12-22 2023-03-28 考克利尔维修工程有限责任公司 换热器以及包括至少一个换热器系列的熔盐蒸汽生成器
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CN109437122B (zh) * 2018-11-29 2020-05-22 联仕(昆山)化学材料有限公司 一种精制酸生产工艺
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CA2904727A1 (fr) 2014-10-02
CN105209843A (zh) 2015-12-30
EP2972042A4 (fr) 2016-12-14
WO2014158350A1 (fr) 2014-10-02
HK1216662A1 (zh) 2016-11-25
KR20150126676A (ko) 2015-11-12

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