EP0446392A1 - Echangeur de chaleur à performance élevée - Google Patents

Echangeur de chaleur à performance élevée Download PDF

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Publication number
EP0446392A1
EP0446392A1 EP90104829A EP90104829A EP0446392A1 EP 0446392 A1 EP0446392 A1 EP 0446392A1 EP 90104829 A EP90104829 A EP 90104829A EP 90104829 A EP90104829 A EP 90104829A EP 0446392 A1 EP0446392 A1 EP 0446392A1
Authority
EP
European Patent Office
Prior art keywords
tubes
heat exchanger
fact
high performance
fluid
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Withdrawn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
EP90104829A
Other languages
German (de)
English (en)
Inventor
Umberto Zardi
Giorgio Pagani
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.)
Casale SA
Original Assignee
Ammonia Casale 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 Ammonia Casale SA filed Critical Ammonia Casale SA
Publication of EP0446392A1 publication Critical patent/EP0446392A1/fr
Withdrawn legal-status Critical Current

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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
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/14—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by endowing the walls of conduits with zones of different degrees of conduction of heat
    • 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
    • F28D7/10—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 one within the other, e.g. concentrically
    • F28D7/12—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 one within the other, e.g. concentrically the surrounding tube being closed at one end, e.g. return type

Definitions

  • the invention concerns a high performance heat exchanger for the recovery of heat such as for example reacted gas, comprising a plurality of first tubes projecting from an upper tube plate and open at the bottom which are bayoned to a plurality of second tubes projecting from a lower tube plate and closed at the bottom, with an airspace between the external wall of said first tubes and the internal wall of said second tubes.
  • exchangers with bayonet-shaped tubes which permit the free expansion of the tubes, while the tube-plate is not subject to deformations, can be conveniently adopted only in those cases where the fluid inside the bayonet-tubes is at boiling point, but not where the fluid to be cooled or heated does not change its physical state, whether liquid or in gas form. That is because in this case the unavoidable heat exchange, called parasitical exchange, between the inner tube and the outer tube of each element of the bayonet exchanger prevents the efficient heat exchange between the outer tube and the fluid in the shell, hence the correct operation of the exchanger.
  • parasitical exchange unavoidable heat exchange
  • a high performance heat exchanger for the recovery of heat such a for example from reacted gas, of the type described in the introduction to the description and in claim 1, characterized by the fact that it comprises a plurality of first tubes projecting from an upper tube-plate and open at the bottom which are bayonet-joined to a plurality of second tubes projecting from a lower tube-plate and closed at the bottom, with an airspace between the outer wall of said first tubes and the inner wall of said second tubes, in which heat exchange resistances are provided. These resistances are situated at least partially lengthwise along said first tubes.
  • said resistances consist of dead zones of stagnant fluid, and more particularly of still, non-circulating fluid.
  • said resistances are provided by inserting a third lot of tubes between the second and the first tubes, the lower end of which is closed on the corresponding lower end of said third tubes.
  • the means further to increase heat resistance and to avoid convection movements are provided inside the airspace between said first and third tubes, more particularly by inserting insulating fluids and/or solids, or by creating vacuum zones.
  • an exchanger for the recovery of heat as for example from reacted gas shown as 1 comprises a shell 2 closed at least at one end by a lid 3.
  • the shell 2 has inside a plurality of first tubes 4 projecting from an upper tube-plate 5 which are open at the bottom.
  • First tubes 4 are bayonet-joined to a plurality of second tubes 6 projecting from a lower tube-plate 7 and which are closed at the bottom.
  • a plurality of third tubes 8 projecting from upper tube-plate 5 the lower ends of which are closed on the corresponding lower ends of said first tubes 4 at point 9.
  • a first plurality of airspaces 10 is thus created between the outer wall of said first tubes 4 and the inner wall of said third tubes 8 and a second plurality of airspaces 11 is created between the outer wall of said third tubes 8 and the inner wall of said second tubes 6.
  • the upper tube-plate 5 and the lower tube-plate 7 divide the space inside shell 2 into three spaces or chambers 12, 13 and 14.
  • the upper chamber 12 comprises a plurality of upper openings 15 and 16 of first tubes 4, respectively third tubes 8, while the intermediate chamber 13 comprises a plurality of upper openings 17 of second tubes 6.
  • a fluid for heat exchange F1 enters the upper chamber 12 from opening 18 and runs through the plurality of upper openings 15 and 16 of the first, respectively third, tubes 4 and 8.
  • Fluid F1 on the other hand, which has run down along the inside of first tubes 4 without undergoing any noticeable heat exchange, runs up, at the end of the latter, along second tubes 6 inside airspace 11 exchanging heat with a second fluid F2 situated in the shell side.
  • Fluid F1 then leaves from upper openings 17 into intermediate chamber 13 and then leaves definitively heat exchanger 1 from outlet 19.
  • the second fluid F2 (i.e., advantageously the hot reacted gas) which entered inside shell 2 from inlet 20 leaves heat exchanger 1 from outlet 21.
  • the exchangers according to the invention can be applied to any type of reactor, and more particularly to the reactors described in the Applicants' patents (see for example US Patents No. 4372920, No. 4405562, No. 4755362, etc.).

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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)
EP90104829A 1988-09-26 1990-03-14 Echangeur de chaleur à performance élevée Withdrawn EP0446392A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH356088A CH674258A5 (fr) 1988-09-26 1988-09-26

Publications (1)

Publication Number Publication Date
EP0446392A1 true EP0446392A1 (fr) 1991-09-18

Family

ID=4258630

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90104829A Withdrawn EP0446392A1 (fr) 1988-09-26 1990-03-14 Echangeur de chaleur à performance élevée

Country Status (2)

Country Link
EP (1) EP0446392A1 (fr)
CH (1) CH674258A5 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0860673A2 (fr) * 1997-02-21 1998-08-26 Haldor Topsoe A/S Chaudière de récupération pour gaz de synthèse
US11054196B2 (en) 2017-05-26 2021-07-06 Alfa Laval Olmi S.P.A. Shell-and-tube heat exchanger

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH674258A5 (fr) * 1988-09-26 1990-05-15 Ammonia Casale Sa

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1493108A (fr) * 1966-07-16 1967-08-25 Fives Penhoet échangeur de chaleur
US3861461A (en) * 1972-09-21 1975-01-21 Foster Wheeler Corp Bayonet tube heat exchange
FR2241759A1 (fr) * 1973-08-21 1975-03-21 Westinghouse Electric Corp
US4290387A (en) * 1979-10-04 1981-09-22 Curtiss-Wright Corporation Fluidized bed combustor and tube construction therefor
US4671351A (en) * 1985-07-17 1987-06-09 Vertech Treatment Systems, Inc. Fluid treatment apparatus and heat exchanger
CH674258A5 (fr) * 1988-09-26 1990-05-15 Ammonia Casale Sa

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1493108A (fr) * 1966-07-16 1967-08-25 Fives Penhoet échangeur de chaleur
US3861461A (en) * 1972-09-21 1975-01-21 Foster Wheeler Corp Bayonet tube heat exchange
FR2241759A1 (fr) * 1973-08-21 1975-03-21 Westinghouse Electric Corp
US4290387A (en) * 1979-10-04 1981-09-22 Curtiss-Wright Corporation Fluidized bed combustor and tube construction therefor
US4671351A (en) * 1985-07-17 1987-06-09 Vertech Treatment Systems, Inc. Fluid treatment apparatus and heat exchanger
CH674258A5 (fr) * 1988-09-26 1990-05-15 Ammonia Casale Sa

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0860673A2 (fr) * 1997-02-21 1998-08-26 Haldor Topsoe A/S Chaudière de récupération pour gaz de synthèse
EP0860673A3 (fr) * 1997-02-21 1999-03-24 Haldor Topsoe A/S Chaudière de récupération pour gaz de synthèse
US11054196B2 (en) 2017-05-26 2021-07-06 Alfa Laval Olmi S.P.A. Shell-and-tube heat exchanger

Also Published As

Publication number Publication date
CH674258A5 (fr) 1990-05-15

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