WO2008038362A1 - Échangeur de chaleur en épingle à cheveux - Google Patents

Échangeur de chaleur en épingle à cheveux Download PDF

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Publication number
WO2008038362A1
WO2008038362A1 PCT/JP2006/319271 JP2006319271W WO2008038362A1 WO 2008038362 A1 WO2008038362 A1 WO 2008038362A1 JP 2006319271 W JP2006319271 W JP 2006319271W WO 2008038362 A1 WO2008038362 A1 WO 2008038362A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
heat transfer
casing
transfer tube
heat
Prior art date
Application number
PCT/JP2006/319271
Other languages
English (en)
Japanese (ja)
Inventor
Hideo Shinozaki
Yuko Komatsu
Hiroaki Honda
Original Assignee
Mitsubishi Kakoki Kaisha, Ltd.
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 Mitsubishi Kakoki Kaisha, Ltd. filed Critical Mitsubishi Kakoki Kaisha, Ltd.
Priority to PCT/JP2006/319271 priority Critical patent/WO2008038362A1/fr
Publication of WO2008038362A1 publication Critical patent/WO2008038362A1/fr

Links

Classifications

    • 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
    • F28D7/08—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 otherwise bent, e.g. in a serpentine or zig-zag
    • 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
    • F28D7/08—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 otherwise bent, e.g. in a serpentine or zig-zag
    • F28D7/082—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 otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration
    • F28D7/085—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 otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration in the form of parallel conduits coupled by bent portions
    • F28D7/087—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 otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration in the form of parallel conduits coupled by bent portions assembled in arrays, each array being arranged in the same plane

Definitions

  • the present invention provides a meandering heat transfer tube comprising a plurality of U-tube portions and a plurality of straight tube portions arranged in parallel in a rectangular casing, and passes the object to be processed into the heat transfer tubes.
  • This relates to a hairpin type heat exchanger that allows heated gas to pass through the casing.
  • a hairpin type heat exchanger such as a raw material preheater or a raw material heater installed in a reforming heating furnace of a conventional small on-site hydrogen production apparatus divides the inside of the furnace with a heat insulating material. Placed inside.
  • this hairpin type heat exchange cannot sufficiently exhibit the heat exchange capacity in which the gap between the heat insulating material partitioning the inside of the furnace and the heat transfer tube disposed in the space is large.
  • the reason for this is that many insulation materials molded into a plate shape with ceramic wool or the like are used as heat insulation materials that divide the inside of the furnace of a small on-site hydrogen production system.
  • the heat transfer tube and the heat insulating material come into contact with each other when the heat transfer tube is installed or due to thermal expansion due to heating, and the heat insulating material is damaged or large irregularities are formed on the surface of the heat insulating material. For this reason, the flow of the heated gas, which is the gap between the heat insulating material and the heat transfer tube, is likely to be constricted or blocked, causing problems such as increased flow resistance. It is a powerful force that has to do with it.
  • the conventional hairpin heat exchanger has difficulty in securing a high gas flow velocity along the heat transfer tube bundle, and as a result, the gas side film heat transfer coefficient (overall heat transfer coefficient) must be set low. Therefore, a large heat transfer area was required. For this reason, it was necessary to develop a compact and high-performance hairpin heat exchanger with a small heat transfer area.
  • the tube bundle is fixed, excessive heat stress is applied to a part of the heat transfer tube due to thermal expansion during heating, which may cause fatigue or deformation of the heat transfer tube.
  • the present invention has been made in order to satisfy the conventional demands, and the purpose of the present invention is to stabilize the fast flow rate of gas flowing in the direction intersecting the tube bundle of heat transfer tubes in a hairpin type heat exchanger.
  • the purpose of this is to provide heat exchange efficiency, to increase heat exchange efficiency, to increase the density of the tube bundle, to reduce the size, and to reduce the thermal stress of the heat transfer tubes.
  • the present invention described in claim 1 is a hairpin heat exchanger provided with a meandering heat transfer tube including a plurality of U-tube portions and a plurality of straight tube portions arranged in parallel.
  • a heat pipe is accommodated in a rectangular casing, the casing is formed into a flat rectangular body, and a space between the inner wall surface of the casing and an apparent flat surface in contact with the heat transfer pipe is maintained at a predetermined distance.
  • a stance piece is provided on the inner wall surface of the casing in a continuous or discontinuous manner in a direction intersecting the straight pipe portion of the heat transfer tube, and the heated fluid is passed through the heat transfer tube, while the heating gas is supplied into the casing.
  • the heat pin type heat exchanger is characterized in that it is configured to exchange heat through.
  • the present invention described in claim 2 is the heat pin type heat exchanger according to claim 1, wherein the heat transfer tube is a heat transfer tube meandering in the vertical direction.
  • the present invention according to claim 3 is the invention according to claim 1 or 2, wherein a lower end surface of the casing of the flat rectangular body opens to serve as a heating gas inlet, and an upper end surface serves as a heating gas outlet. It is a heat pin type heat exchanger ⁇
  • the present invention according to claim 4 provides the casing according to any one of claims 1 to 3.
  • This is a hairpin type heat exchanger in which the distance between the inner wall surface and the apparent plane in contact with the serpentine heat transfer tube is kept in the range of 1 to LOmm.
  • a fifth aspect of the present invention is the method according to any one of the first to fourth aspects, wherein the lower side of the heat transfer tube crosses the heat transfer tube in a horizontal direction below the straight pipe portion of the heat transfer tube.
  • This is a heat pin type heat exchanger ⁇ with a tube support that supports it.
  • a sixth aspect of the present invention is the method according to any one of the first to fifth aspects, wherein an upper side displacement of the heat transfer tube is formed above the straight tube portion of the heat transfer tube so as to intersect the heat transfer tube in the horizontal direction. It is a hairpin type heat exchanger provided with a tube guide to be suppressed.
  • the present invention according to claim 7 is the invention according to claim 5 or 6, wherein both ends of the tube support and the tube guide are fixed through the front and back wall surfaces of the casing.
  • This is a Yarpin heat exchanger.
  • the present invention described in claim 1 is a hairpin heat exchanger provided with a meandering heat transfer tube including a plurality of U-shaped tube portions and a plurality of straight tube portions arranged in parallel.
  • a distance piece that accommodates the heat transfer tube in a rectangular casing forms the casing into a flat rectangular body, and maintains a predetermined distance between the inner wall surface of the casing and the apparent flat surface in contact with the heat transfer tube Is provided on the inner wall surface of the casing continuously or discontinuously in a direction intersecting the straight pipe portion of the heat transfer tube, and the fluid to be heated is passed through the heat transfer tube while heat is exchanged through the heating gas into the casing.
  • the gap between the heat transfer tube and the inner wall of the casing can be reduced reliably, allowing the hot gas to pass through the casing uniformly and at a high flow rate, thereby preventing the drift of the heated gas. Together with Efficient heat exchanger to maintain a high Gawasakaimakuden thermal coefficient (overall heat transfer coefficient) is made possible.
  • the distance piece is provided on the inner wall surface of the casing in a continuous or discontinuous manner in a direction crossing the straight pipe portion of the heat transfer tube, so that the flow of the heated gas is not obstructed and the heat transfer tube is more than necessary. The gap between the heat transfer tube and the casing can be easily secured without being constrained.
  • the heat transfer tube is a heat transfer tube meandering in the vertical direction
  • the fluid to be heated is introduced from under the heat exchanger or with an upper force, and the heat transfer tube Staying in Can be sequentially heated.
  • the lower end surface of the casing of the flat rectangular body is opened to serve as a heating gas inlet, and the upper end surface includes a heating gas outlet and is sealed.
  • the heated gas can be circulated by a natural flow with an upward force from the bottom.
  • the distance between the inner wall surface of the casing and the apparent plane in contact with the serpentine heat transfer tube is maintained in the range of 1 to LOmm.
  • the gap with the inner wall of the casing is maintained within the optimum range of heat exchange efficiency.
  • the tube support that supports the lower side of the heat transfer tube is provided below the straight tube portion of the heat transfer tube so as to intersect the heat transfer tube in the horizontal direction. It only supports the weight of the heat tube, and it also significantly reduces the heat stress of the heat transfer tube compared to the fixed support that supports the elongation of the heat transfer tube during operation in a slidable manner and restrains the long direction. can do.
  • the tube guide is provided above the straight tube portion of the heat transfer tube so as to cross the heat transfer tube in the horizontal direction and suppress the upper displacement of the heat transfer tube. Since the heat pipe is slidably guided even when the heat pipe extends, it is possible to greatly relieve the heat stress of the heat transfer pipe without concentrating the heat stress on the U-shaped pipe part due to the extension of the heat transfer pipe.
  • both ends of each of the tube support and the tube guide are fixed through the front and back wall surfaces of the casing, These can be arranged at appropriate positions in consideration of elongation.
  • the support or guide since it penetrates the wall surface and is fixed to the casing, the support or guide will not come off even if the casing is thermally deformed by the heated gas.
  • FIG. 1 is a front view of a hairpin type heat exchange according to the present invention.
  • FIG. 2 is a cross-sectional view taken along the line AA in FIG.
  • FIG. 3 is a cross-sectional view taken along the line BB in FIG.
  • FIG. 4 is a cross-sectional view taken along CC in FIG.
  • FIG. 5 is a cross-sectional view of a conventional heat exchanger.
  • the hairpin type heat exchanger 10 connects a plurality of U-shaped tube portions 22 and a plurality of straight tube portions 21 to form a meandering heat transfer tube 20, and the meandering heat transfer tube
  • the heat tube 20 is accommodated in a rectangular casing 30.
  • the casing 30 is provided with a head portion 31 at an upper portion thereof, and the head portion 31 is provided with a heated fluid introduction port 32, a heated fluid discharge port 33, and a heated gas discharge port 34.
  • One end of the heat transfer tube 20 is connected to the heated fluid introduction port 32, and the other end of the heat transfer tube 20 is connected to the heated fluid discharge port 33.
  • a heated gas inlet 35 is provided at the lower part of the casing 30.
  • the casing 30 is formed in a rectangular shape with a flat cross section, and apparently contacts the inner wall surface 30a on the front side of the casing 30 and the meandering heat transfer tube 20.
  • the gap L between the flat surface P and the inner wall 30b on the back side of the casing 30 and the serpentine heat transfer tube 20 are also optimally narrowed.
  • LOmm is preferable. If it is narrower than this gap, the pressure loss increases, and the flow rate of the heated gas cannot be increased. On the other hand, if it is wider than this interval, the flow rate of the heated gas becomes slow, the heat exchange efficiency is lowered, a larger heat transfer area is required, and miniaturization is difficult. Become.
  • a distance piece 40 is provided on the inner wall surface 30a on the front side of the casing 30 and the inner wall surface 30b on the rear side, so that the heat transfer tube 20 is directly applied to the inner wall surface on the front side of the casing 30. 30a and the inner wall surface 30b on the back side are prevented from touching. As shown in FIG. 1, these distance pieces 40 are continuously provided in a direction intersecting the straight pipe portion 21, specifically, in a vertical direction of the casing 30. However, there is no problem even if it is discontinuous.
  • a rod-shaped distance piece having a rectangular cross section is used.
  • a rod-shaped body having a square or circular cross section has no problem. The point is that the heat transfer tube 20 force is not directly in contact with the inner wall surfaces 30a, 30b of the casing 30.
  • the heat transfer tube 20 has a tube support 5 on the lower side of the straight tube portion 21.
  • the tube support 51 and the tube guide 52 are fixed at both ends. As shown in FIG. 4, one end of the tube support 51 and the tube guide 52 are inserted into a hole 36 a provided in the front wall surface 30 a of the casing 30, and the other end is the casing 30. Is inserted into a hole 36b provided in the wall surface 30b on the back side. The tube support 51 and the tube guide are welded around the holes 36a and 36b.
  • the hot gas 11 is supplied to the heating gas inlet 35 at the lower part of the casing as indicated by the arrow a, passes through the casing 30, and has a force 34 at the upper part of the casing. Discharged as shown by arrow a '.
  • the heated fluid 12 is supplied to the heated fluid inlet 32 as indicated by an arrow b and heated to a predetermined temperature while passing through the heat transfer tube 20 meandering in a zigzag manner. It is discharged from the heated fluid outlet 33 as shown by the arrow b '.
  • the hairpin heat exchanger of the present invention includes a raw material preheater, a raw material heater, or a raw material together with a reformer that reforms the raw material to generate hydrogen in a small on-site hydrogen production apparatus.
  • a raw material preheater a raw material heater
  • a reformer that reforms the raw material to generate hydrogen in a small on-site hydrogen production apparatus.
  • the hairpin type heat exchanger of the present invention is useful for other uses such as a feed water preheater and a steam generator.

Landscapes

  • 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

Selon la présente invention, l'écoulement rapide d'un gaz circulant dans le faisceau de tubes d'un échangeur de chaleur en épingle à cheveux est sécurisé, et la contrainte thermique appliquée sur un tube de conduction thermique est supprimée. Cette invention concerne un échangeur de chaleur en épingle à cheveux comprenant un tube serpentin de conduction thermique constitué de parties tubulaires en U et de parties tubulaires rectilignes disposées parallèlement les unes aux autres. Le tube de conduction thermique est logé dans un boîtier rectangulaire plat. Des éléments d'écartement conçus pour maintenir un espace prédéterminé entre la surface de paroi interne du boîtier et un plan plat apparent en contact avec le tube de conduction thermique sont montés sur la surface de paroi interne du boîtier de manière continue ou discontinue, de façon à s'étendre perpendiculairement aux parties tubulaires rectilignes du tube de conduction thermique. Un fluide à chauffer circule dans le tube de conduction thermique, tandis qu'un gaz de chauffage traverse le boîtier à des fins d'échange thermique.
PCT/JP2006/319271 2006-09-28 2006-09-28 Échangeur de chaleur en épingle à cheveux WO2008038362A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/319271 WO2008038362A1 (fr) 2006-09-28 2006-09-28 Échangeur de chaleur en épingle à cheveux

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2006/319271 WO2008038362A1 (fr) 2006-09-28 2006-09-28 Échangeur de chaleur en épingle à cheveux

Publications (1)

Publication Number Publication Date
WO2008038362A1 true WO2008038362A1 (fr) 2008-04-03

Family

ID=39229809

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2006/319271 WO2008038362A1 (fr) 2006-09-28 2006-09-28 Échangeur de chaleur en épingle à cheveux

Country Status (1)

Country Link
WO (1) WO2008038362A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5446145U (fr) * 1977-09-06 1979-03-30
JPH1096504A (ja) * 1996-09-20 1998-04-14 Miura Co Ltd 熱交換器
JP2003279286A (ja) * 2002-03-26 2003-10-02 Toyo Radiator Co Ltd 熱交換器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5446145U (fr) * 1977-09-06 1979-03-30
JPH1096504A (ja) * 1996-09-20 1998-04-14 Miura Co Ltd 熱交換器
JP2003279286A (ja) * 2002-03-26 2003-10-02 Toyo Radiator Co Ltd 熱交換器

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