FR2658278A1 - REMOVABLE HEAT EXCHANGER HAVING HAIRPIN TUBES ARRANGED IN PARALLEL PLANS. - Google Patents

REMOVABLE HEAT EXCHANGER HAVING HAIRPIN TUBES ARRANGED IN PARALLEL PLANS. Download PDF

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Publication number
FR2658278A1
FR2658278A1 FR9001748A FR9001748A FR2658278A1 FR 2658278 A1 FR2658278 A1 FR 2658278A1 FR 9001748 A FR9001748 A FR 9001748A FR 9001748 A FR9001748 A FR 9001748A FR 2658278 A1 FR2658278 A1 FR 2658278A1
Authority
FR
France
Prior art keywords
tubes
tube
enclosure
branches
tubular plates
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Withdrawn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
FR9001748A
Other languages
French (fr)
Inventor
Teton Andre
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.)
Stein Industrie SA
Original Assignee
Stein Industrie SA
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 Stein Industrie SA filed Critical Stein Industrie SA
Priority to FR9001748A priority Critical patent/FR2658278A1/en
Priority to EP91400333A priority patent/EP0442795B1/en
Priority to DK91400333.0T priority patent/DK0442795T3/en
Priority to AT91400333T priority patent/ATE106541T1/en
Priority to ES91400333T priority patent/ES2056590T3/en
Priority to DE69102159T priority patent/DE69102159T2/en
Publication of FR2658278A1 publication Critical patent/FR2658278A1/en
Withdrawn legal-status Critical Current

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
    • 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
    • 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
    • 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
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies
    • F28F9/0131—Auxiliary supports for elements for tubes or tube-assemblies formed by 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
    • F28F2280/00—Mounting arrangements; Arrangements for facilitating assembling or disassembling of heat exchanger parts
    • F28F2280/02—Removable elements

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

Dismountable heat exchanger for heat exchange between a fluid flowing inside multiple horizontal hairpin tubes (2), which are mounted on vertical tubular plates (13, 14, 15) orthogonal to the tubes, and a gas loaded with solid particles circulating around these tubes (2) inside an enclosure (1) of rectangular parallelepipedal shape, each tube being connected at the inlet and at the outlet by branches (7, 8) passing through the walls of the enclosure, the said tubular plates (13, 14, 15) being pierced with oval windows (19) forming slots at right angles to the bends of the tubes, and circular openings (20) at right angles to the straight lengths of the tubes, characterised in that the oval windows are pierced at right angles to the bends (11) of the tubes (2) located on the side of the wall traversed by the branches (7, 8) and in that the wall (3) of the enclosure opposite that traversed by the branches (7, 8) is dismountable. The replacement of a tube (2) is very easy and does not require the dismounting of the tubular plates (13, 14, 15).

Description

Echangeur de chaleur démontable à tubes en épingles à cheveux disposésDismountable heat exchanger with hairpin tubes arranged

dans des plans parallèles.in parallel planes.

La présente invention concerne un échangeur de chaleur démontable entre un fluide circulant à l'intérieur de tubes en épingles à cheveux s multiples, disposés dans des plans parallèles, montés sur des plaques tubulaires verticales, et un gaz chargé de particules solides circulant autour de ces tubes à l'intérieur d'une enceinte en forme de parallélépipède rectangle, chaque tube étant relié à des collecteurs d'entrée et de sortie par des branches passant à travers la paroi de  The present invention relates to a removable heat exchanger between a fluid circulating inside tubes with multiple hairpins, arranged in parallel planes, mounted on vertical tubular plates, and a gas charged with solid particles circulating around these tubes inside an enclosure in the shape of a rectangular parallelepiped, each tube being connected to inlet and outlet manifolds by branches passing through the wall of

l'enceinte située du côté des collecteurs.  the enclosure located on the side of the collectors.

Ces échangeurs sont notamment utilisés pour le refroidissement de cendres issues d'un réacteur à lit fluidisé circulant, avant leur  These exchangers are used in particular for cooling ash from a circulating fluidized bed reactor, before their

recyclage dans le réacteur.recycling in the reactor.

Ces échangeurs sont soumis à des phénomènes d'érosion par les particules circulant autour de leurs tubes, qui nécessitent des  These exchangers are subject to erosion phenomena by the particles circulating around their tubes, which require

réparations fréquentes, chaque fois que l'un des tubes est percé.  frequent repairs, each time one of the tubes is pierced.

Si ces échangeurs sont réalisés avec les plaques tubulaires habituelles, la réparation d'un seul tube nécessite le démontage de la totalité de l'échangeur (tubes, plaques tubulaires et entretoises) hors de l'enceinte, ce qui pose d'importants problèmes de manutention  If these exchangers are made with the usual tubular plates, the repair of a single tube requires the disassembly of the entire exchanger (tubes, tubular plates and spacers) outside the enclosure, which poses significant problems of handling

et de coût.and cost.

La présente invention a pour but de procurer un échangeur de chaleur de ce genre dont les réparations puissent être effectuées de façon plus rapide, avec beaucoup moins de manutentions, et entraînent  The object of the present invention is to provide a heat exchanger of this kind, the repairs of which can be carried out more quickly, with much less handling, and entail

des frais bien moindres.much lower costs.

L'échangeur de chaleur selon l'invention est caractérisé en ce que chaque tube est rendu démontable grâce à des fenêtres de forme ovale, formant boutonnières, percées dans les plaques tubulaires au droit des coudes des tubes, et munies de fourreaux, et à des ouvertures circulaires percées dans les plaques tubulaires en face des longueurs droites des tubes, également munies de fourreaux, et en ce que la paroi de l'enceinte opposée à celle traversée par les  The heat exchanger according to the invention is characterized in that each tube is made removable thanks to oval-shaped windows, forming buttonholes, drilled in the tubular plates in line with the elbows of the tubes, and provided with sleeves, and with circular openings drilled in the tubular plates opposite the straight lengths of the tubes, also provided with sleeves, and in that the wall of the enclosure opposite to that crossed by the

branches est démontable.branches is removable.

-2- Il est décrit ci-après, à titre d'exemple et en référence aux  -2- It is described below, by way of example and with reference to

figures du dessin annexé, un échangeur de chaleur démontable selon.  Figures of the accompanying drawing, a removable heat exchanger according to.

l'invention. La figure 1 représente l'échangeur en élévation latérale, le plan de la figure étant parallèle aux plans des épingles à cheveux  the invention. Figure 1 shows the exchanger in side elevation, the plane of the figure being parallel to the plans of the hairpins

multiples, avec coupe de la paroi de l'enceinte.  multiple, with section of the wall of the enclosure.

La figure 2 le représente en coupe entre deux plaques tubulaires, le plan de la figure étant perpendiculaire aux plans des épingles à cheveux. La figure 3 représente de face le détail d'une "boutonnière" de  Figure 2 shows it in section between two tubular plates, the plane of the figure being perpendicular to the planes of the hairpins. Figure 3 shows a front view of a "buttonhole" detail.

plaque tubulaire pour le passage d'un coude de tube.  tube plate for the passage of a tube bend.

La figure 4 représente la même "boutonnière" vue de profil, avec les fourreaux de protection des tubes (détail IV de la figure 1) La figure 5 représente le détail d'un orifice de passage d'une longueur droite d'extrémité de tube avec son fourreau (détail V de la  FIG. 4 represents the same "buttonhole" seen in profile, with the protective sleeves of the tubes (detail IV of FIG. 1) FIG. 5 represents the detail of a passage orifice with a straight length of tube end with its scabbard (detail V of the

figure 1).figure 1).

Dans la figure 1, l'échangeur comporte une chambre garnie de réfractaire 1 autour d'un jeu 2 de tubes en épingles à cheveux  In Figure 1, the exchanger has a chamber lined with refractory 1 around a set 2 of tubes with hairpins

multiples montés dans des plans parallèles.  multiples mounted in parallel planes.

La chambre comporte sur l'un de ses côtés faisant face à l'une des plaques tubulaires une paroi démontable 3 permettant de retirer de cette chambre l'un ou l'autre des tubes en épingle à cheveux tels que 15 Sur le sol de la chambre sont disposés des injecteurs d'air de  The chamber has on one of its sides facing one of the tubular plates a removable wall 3 making it possible to remove from this chamber one or the other of the hairpin tubes such as 15 On the floor of the chamber are arranged air injectors of

fluidisation 4.fluidization 4.

Le tube en épingle à cheveux multiple représenté est relié à des collecteurs d'arrivée 5 et de sortie 6 du fluide à réchauffer en échange de chaleur avec les particules solides Des branches de tube 7 et 8 traversant la paroi relient ces collecteurs au tube en épingle à cheveux, qui comporte des longueurs droite d'arrivée 9 et de sortie 10 et des boucles telles que 11 sur sa droite et 12 sur sa gauche Le tube est maintenu dans des plaques tubulaires fixes 13, 14, 15 Ces  The multiple hairpin tube shown is connected to inlet 5 and outlet 6 collectors of the fluid to be heated in exchange for heat with the solid particles. Tube branches 7 and 8 passing through the wall connect these collectors to the pin tube. hair, which has straight lengths inlet 9 and outlet 10 and loops such as 11 on its right and 12 on its left The tube is held in fixed tubular plates 13, 14, 15 These

plaques sont reliées par des entretoises 16, 17, 18.  plates are connected by spacers 16, 17, 18.

Il est représenté à gauche en trait interrompu un tube en épingles à cheveux 30 sorti de l'enceinte 1 pour réparation (la porte  It is shown on the left in broken lines a hairpin tube 30 taken out of enclosure 1 for repair (the door

3 ayant été au préalable démontée à cet effet).  3 having been previously dismantled for this purpose).

-3- On voit en figure 2 les fenêtres ovales ou "boutonnières" telles que 19 des plaques tubulaires permettant le dégagement des coudes du tube en épingle à cheveux Les branches rectilignes d'arrivée et de sortie 9, 10 traversent les plaques tubulaires par des orifices circulaires tels que 20. Les figures 3 et 4 montrent à plus grande échelle les "boutonnières" 19 permettant le passage des coudes du tube à travers les plaques tubulaires 13, 14, 15 Les branches 21 et 22 passent par les extrémités inférieure et supérieure de la fenêtre 19 Les fourreaux en forme de U inférieur 23 et supérieur 24, soudés sur la plaque tubulaire par des cordons de soudure tels que 25 et 26, protègent les branches 21 et 22 contre une détérioration par l'arête  -3- We see in Figure 2 the oval windows or "buttonholes" such as 19 of the tubular plates allowing the release of the elbows from the hairpin tube. The straight inlet and outlet branches 9, 10 pass through the tubular plates. circular orifices such as 20. Figures 3 and 4 show on a larger scale the "buttonholes" 19 allowing the passage of the elbows of the tube through the tubular plates 13, 14, 15 The branches 21 and 22 pass through the lower and upper ends from window 19 The lower 23 and upper 24 U-shaped sheaths welded to the tube plate by weld beads such as 25 and 26, protect the branches 21 and 22 against deterioration by the edge

de la "boutonnière" lorsque l'on retire le tube en épingle à cheveux.  "buttonhole" when removing the hairpin tube.

Des espaceurs, non représentés, maintiennent l'écartement entre les  Spacers, not shown, maintain the spacing between the

deux branches du tube au niveau de ces "boutonnières".  two branches of the tube at these "buttonholes".

La figure 5 représente à plus grande échelle un orifice circulaire de passage de la branche rectiligne supérieure 10 du tube en épingle à cheveux Un fourreau circulaire 27 est soudé sur les  FIG. 5 shows on a larger scale a circular orifice for the passage of the upper rectilinear branch 10 of the hairpin tube. A circular sheath 27 is welded to the

plaques tubulaires 13, 14, 15 par des cordons de soudure tels que 28.  tubular plates 13, 14, 15 by weld beads such as 28.

L'entretoise 18 est également soudée sur la plaque tubulaire par un  The spacer 18 is also welded to the tube plate by a

cordon de soudure 29.weld bead 29.

Le démontage et le remontage d'un tube en épingles à cheveux multiples tel que celui représenté en figure 1 s'effectuent comme suit On coupe les tronçons de tube 7, 8 le reliant aux collecteurs d'arrivée et de sortie 5 et 6 On démonte la paroi 3 de l'enceinte faisant face à la plaque tubulaire 13 On tire alors le tube par ses  The disassembly and reassembly of a tube made of multiple hairpins such as that shown in FIG. 1 is carried out as follows: The tube sections 7, 8 are connected, connecting it to the inlet and outlet manifolds 5 and 6 the wall 3 of the enclosure facing the tubular plate 13 The tube is then pulled by its

boucles telles que 12 du c 8 té de l'ouverture dégagée dans la paroi.  loops such as 12 of the c 8 tee of the opening released in the wall.

Les boucles telles que 11 passent à travers les fenêtres 19 des plaques tubulaires 13, 14, 15 et ses longueurs droites d'arrivée et de sortie ( 10 + 8) et ( 9 + 7) passent à travers les fourreaux circulaires  The loops such as 11 pass through the windows 19 of the tube plates 13, 14, 15 and its straight inlet and outlet lengths (10 + 8) and (9 + 7) pass through the circular sleeves

tels que 27 On retire entièrement le tube de l'enceinte 1.  such as 27 The tube is completely removed from enclosure 1.

On effectue alors la réparation nécessaire sur le tube, puis on procède à son remontage A cet effet, on présente dans les "boutonnières" de la plaque tubulaire 13 les coudes tels que 11 du tube, on les fait passer à travers celles-ci, puis à travers les -4- fenêtres correspondantes des plaques tubulaires 14, 15, cependant que les longueurs droites ( 10 + 8) et ( 9 + 7) passent à travers les fourreaux circulaires 27 de ces mêmes plaques tubulaires, puis dans les ouvertures à travers la paroi de l'enceinte en face de la plaque tubulaire 14 On soude alors à nouveau les tronçons de tube 7 et 8 pour rétablir leur liaison avec les collecteurs 5 et 6 On peut alors refermer la paroi 3 de l'enceinte faisant face à la plaque tubulaire  We then carry out the necessary repair on the tube, then we reassemble. For this purpose, we present in the "buttonholes" of the tube plate 13 the elbows as 11 of the tube, we pass them through them, then through the corresponding windows of the tube plates 14, 15, while the straight lengths (10 + 8) and (9 + 7) pass through the circular sheaths 27 of these same tube plates, then in the openings at through the wall of the enclosure opposite the tubular plate 14 Then the tube sections 7 and 8 are welded again to re-establish their connection with the collectors 5 and 6 We can then close the wall 3 of the enclosure facing the tube plate

13 et remettre en service l'échangeur.  13 and put the heat exchanger back into service.

--

Claims (1)

REVENDICATIONCLAIM 1/ Echangeur de chaleur démontable entre un fluide circulant à l'intérieur de tubes en épingles à cheveux multiples, disposés dans des plans parallèles, montés sur des plaques tubulaires verticales ( 13, 14, 15), et un gaz chargé de particules solides circulant autour de ces tubes à l'intérieur d'une enceinte ( 1) en forme de parallélépipède rectangle, chaque tube étant relié à des collecteurs ( 5, 6) d'entrée et de sortie par des branches ( 7, 8) passant à travers la paroi de l'enceinte située du côté des collecteurs ( 5, 6), caractérisé en ce que chaque tube est rendu démontable grâce à des fenêtres de forme ovale, formant boutonnières ( 19), percées dans les plaques tubulaires au droit des coudes ( 11, 12) des tubes, et munies de fourreaux ( 23, 24), et à des ouvertures circulaires ( 20) percées dans les plaques tubulaires en face des longueurs droites des tubes, également munies de fourreaux ( 27), et en ce que la paroi ( 3) de l'enceinte opposée à celle traversée par les branches ( 7, 8) est  1 / Removable heat exchanger between a fluid circulating inside tubes with multiple hairpins, arranged in parallel planes, mounted on vertical tubular plates (13, 14, 15), and a gas charged with solid particles circulating around these tubes inside an enclosure (1) in the shape of a rectangular parallelepiped, each tube being connected to inlet and outlet manifolds (5, 6) by branches (7, 8) passing through the wall of the enclosure situated on the side of the collectors (5, 6), characterized in that each tube is made removable thanks to oval windows, forming buttonholes (19), drilled in the tubular plates in line with the elbows ( 11, 12) of the tubes, and provided with sleeves (23, 24), and with circular openings (20) drilled in the tubular plates opposite the straight lengths of the tubes, also fitted with sleeves (27), and in that the wall (3) of the opposite enclosure that through which the branches (7, 8) is démontable.removable.
FR9001748A 1990-02-14 1990-02-14 REMOVABLE HEAT EXCHANGER HAVING HAIRPIN TUBES ARRANGED IN PARALLEL PLANS. Withdrawn FR2658278A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
FR9001748A FR2658278A1 (en) 1990-02-14 1990-02-14 REMOVABLE HEAT EXCHANGER HAVING HAIRPIN TUBES ARRANGED IN PARALLEL PLANS.
EP91400333A EP0442795B1 (en) 1990-02-14 1991-02-12 Dismountable heat exchanger with hairpin tubes in parallel planes
DK91400333.0T DK0442795T3 (en) 1990-02-14 1991-02-12 Removable heat exchanger with hairpin tubes in parallel planes
AT91400333T ATE106541T1 (en) 1990-02-14 1991-02-12 DETACHABLE HEAT EXCHANGER WITH HAIRPIN TUBES IN PARALLEL PLANES.
ES91400333T ES2056590T3 (en) 1990-02-14 1991-02-12 REMOVABLE HEAT EXCHANGER WITH TUBES IN THE FORM OF FORKS ARRANGED ON PARALLEL PLANES.
DE69102159T DE69102159T2 (en) 1990-02-14 1991-02-12 Demountable heat exchanger with hairpin tubes in parallel planes.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9001748A FR2658278A1 (en) 1990-02-14 1990-02-14 REMOVABLE HEAT EXCHANGER HAVING HAIRPIN TUBES ARRANGED IN PARALLEL PLANS.

Publications (1)

Publication Number Publication Date
FR2658278A1 true FR2658278A1 (en) 1991-08-16

Family

ID=9393704

Family Applications (1)

Application Number Title Priority Date Filing Date
FR9001748A Withdrawn FR2658278A1 (en) 1990-02-14 1990-02-14 REMOVABLE HEAT EXCHANGER HAVING HAIRPIN TUBES ARRANGED IN PARALLEL PLANS.

Country Status (6)

Country Link
EP (1) EP0442795B1 (en)
AT (1) ATE106541T1 (en)
DE (1) DE69102159T2 (en)
DK (1) DK0442795T3 (en)
ES (1) ES2056590T3 (en)
FR (1) FR2658278A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29510720U1 (en) * 1995-07-01 1995-09-07 BDAG Balcke-Dürr AG, 40882 Ratingen Heat exchanger
JP5829597B2 (en) * 2012-11-22 2015-12-09 三菱重工業株式会社 Finned tube heat exchanger

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1038078A (en) * 1963-08-12 1966-08-03 Marston Excelsior Ltd Heat exchangers
FR2375563A1 (en) * 1976-12-23 1978-07-21 Dorr Oliver Inc FLUIDIZED BED HEATING UNIT
FR2409478A1 (en) * 1977-11-16 1979-06-15 Stal Laval Apparat Ab WALL TO SUPPORT COILS ESPECIALLY FOR HEAT EXCHANGERS
GB2117503A (en) * 1982-03-29 1983-10-12 Westinghouse Electric Corp Heat exchanger tube support plate
US4522157A (en) * 1982-09-30 1985-06-11 Lummus Crest Inc. Convection section assembly for process heaters

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4580623A (en) * 1984-10-02 1986-04-08 Inglis Limited Heat exchanger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1038078A (en) * 1963-08-12 1966-08-03 Marston Excelsior Ltd Heat exchangers
FR2375563A1 (en) * 1976-12-23 1978-07-21 Dorr Oliver Inc FLUIDIZED BED HEATING UNIT
FR2409478A1 (en) * 1977-11-16 1979-06-15 Stal Laval Apparat Ab WALL TO SUPPORT COILS ESPECIALLY FOR HEAT EXCHANGERS
GB2117503A (en) * 1982-03-29 1983-10-12 Westinghouse Electric Corp Heat exchanger tube support plate
US4522157A (en) * 1982-09-30 1985-06-11 Lummus Crest Inc. Convection section assembly for process heaters

Also Published As

Publication number Publication date
ATE106541T1 (en) 1994-06-15
EP0442795B1 (en) 1994-06-01
ES2056590T3 (en) 1994-10-01
DK0442795T3 (en) 1994-07-25
EP0442795A1 (en) 1991-08-21
DE69102159T2 (en) 1994-09-08
DE69102159D1 (en) 1994-07-07

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