EP0155772A1 - Wärmeaustauscher - Google Patents

Wärmeaustauscher Download PDF

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Publication number
EP0155772A1
EP0155772A1 EP85301197A EP85301197A EP0155772A1 EP 0155772 A1 EP0155772 A1 EP 0155772A1 EP 85301197 A EP85301197 A EP 85301197A EP 85301197 A EP85301197 A EP 85301197A EP 0155772 A1 EP0155772 A1 EP 0155772A1
Authority
EP
European Patent Office
Prior art keywords
passage
passages
refluxing
heat exchanger
wall
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Withdrawn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
EP85301197A
Other languages
English (en)
French (fr)
Inventor
Terence Ronald Tomlinson
Donald Ray Cummings
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.)
DUT Pty Ltd
Costain Petrocarbon Ltd
Original Assignee
DUT Pty Ltd
Costain Petrocarbon 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 DUT Pty Ltd, Costain Petrocarbon Ltd filed Critical DUT Pty Ltd
Publication of EP0155772A1 publication Critical patent/EP0155772A1/de
Withdrawn legal-status Critical Current

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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
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0062—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by spaced plates with inserted elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B9/00—Auxiliary systems, arrangements, or devices
    • F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements

Definitions

  • This invention relates to refluxing heat exchangers sometimes known as dephlegmators, and in particular to such exchangers of the so-called plate-fin type.
  • Such exchangers may be described as comprising a block which in its simplest form includes at least one first hollow section having an inlet and outlet for the passage of a fluid heat exchange medium therethrough and at least one second hollow section which is defined by a pair of spaced parallel plates subdivided by a corrugated sheet into a plurality of generally parallel and vertically disposed passages for the upward flow of vapour therethrough from an inlet at the bottom to an outlet at the top.
  • the said first and second hollow sections are separated by a common wall, which is usually one of the flat plates of the second section, for the transfer of heat between the fluid heat exchange medium and the vapour.
  • the first section like the second, is also divided into a plurality of parallel passageways eg. by a corrugated sheet.
  • the second hollow section may be divided by two or more corrugated sheets each separated from the next by a flat sheet, to form, in effort, two or more bnnks of passages for the upward flow of the vapour which is to be cooled.
  • the vapour to be cooled enters the passages at the bottom and travels upwards while being cooled by indirect heat exchange with the fluid circulating through the first hollow section.
  • the descending liquid film must thicken and form drops of sufficient size to overcome surface tension forces before the liquid film can break away. These drops tend to reduce the flow area for ascending gas and thus the gas velocity and vapour shear will locally be higher than elsewhere and the greatest tendency for flooding is at the bottom of the passage.
  • a refluxing plate-fin heat exchanger comprising a block including at least one first hollow section with an inlet and outlet for the passage of a fluid heat exchange medium therethrough and at least one second hollow section defined by a pair of generally parallel and flat plates the space between which is divided by a corrugated sheet, or two or more corrugated sheets each separated from the next by a flat sheet, into a plurality of separate and generally vertically disposed passages for the upward flow of vapour therethrough from an inlet at the bottom to an outlet at the top, said first and second sections having a common wall for the transfer of heat between them, and wherein each of at least some of said passages are provided with means, such as a surface extending generally downwardly below the bottom of the passage, for lowering the droplet forming zone for any liquid flowing down the wall of the passage to a level at which drop
  • the surface extending generally downwardly below the bottom of the passage may be provided in many ways.
  • the wall of the passage may be extended below the passage opening for a part only of its periphery; for example, by extending the corrugated sheet, a corrugation of which forms part of the passage wall, downwardly below the bottom of the flat sheet which formn the remainder of the passage wall, or vice versa.
  • the corrugated sheet or flat sheet which is extended downwards relative to the other may be perforated in its extension, if desired, to reduce interference with horizontal gas flow below the passage opening.
  • an extension which may be in the form of one or more wires or strips may be attached to the bottom of the passage e.g. by brazing or other suitable means.
  • the extension may, for example, comprise a bundle of wires in the form of a brush.
  • Such extensions may, if desired, be attached to the walls of the passages above the bottoms thereof and extend below the bottoms whereby to conduct any liquid flowing down the passage wall to a level below the passage opening. It will also be understood that these extensions need not be attached to, or even touch, the passage wall provided they are in sufficiently close proximity as to permit flow of liquid down the passage wall to transfer to and continue to flow down the extension.
  • Each of the refluxing sections is divided into a plurality of vertical passageways by corrugated sheets 12, 22 etc. these corrugations having in cross-section the general configuration of a square wave with rounded corners as shown in Figure 1A.
  • the first or coolant sections are also divided likewise into passageways by corrugated sheets, not shown.
  • vapour feed enters the bottom of the refluxing sections and, as it travels upwardly through the sections, is cooled by heat exchange with a coolant medium that is circulated through the coolant sections of the heat exchanger. Condensate formed by the cooling of the vapour travels back down the passages in counter-current direct contact with the rising vapour stream and exits from the bottom of the passages.
  • the walls of each of the passages in each of the refluxing sections of the heat exchanger are formed in part by a corrugation of the corrugated sheet 12, 22 etc. and in part by one of the two parting sheets between which the corrugated sheet lies.
  • a part of the periphery of the wall of each passageway is, in accordance with the invention, extended downwards a sufficient distance to lower the droplet-forming zone below the plane in which the openings of the passages lie. This is effected by arranging for the bottom end of each of the corrugated sheets 12, 22, etc.
  • the degree of extension of the corrugated sheet is not critical provided that the desired end of lowering the zone in which the droplets form to a level at which the forming droplets do not constrict the passage openings is achieved. In general an extension of about the same order as the corrugation height, which is typically about 0.25 inch (6mm), is adequate.
  • the solution according to the invention is provided by arranging for a parting sheet, eg. 30 or 50, which provides a part of the wall for passageways in a refluxing section, to be extended below the bottom of the adjacent corrugated sheet 12, 22.
  • a parting sheet eg. 30 or 50
  • the lower edge of the parting sheet is serrated or otherwise suitably profiled to encourage localised areas of concentration of the liquid film and assist droplet formation.
  • the zone at which the downflowing liquid film forms into droplets is thereby brought to a level below the passage openings thus reducing or avoiding altogether a tendency of the openings to become blocked by the forming droplets.
  • FIGs 4, 5, and 7 are vertical cross-sections through refluxing heat exchangers of the general kind described above with reference to Figures 1 to 3 but wherein each refluxing section comprises, respectively, two or three layers of corrugated sheet each separated from the next by a flat secondary parting sheet, whereby to provide, respectively, two or three banks of passages.
  • each refluxing section contains two or three layers, respectively, of corrugated sheet, identified as 12A, 12B, 22A, 22B etc. in Figure 4 and 12A, 12B, 12C, 22A, 22B, 22C etc. in Figure 5, each pair of adjacent corrugated sheets being separated by a flat secondary parting sheet 14, 24 etc. in Figure 4 and 14A, 14B, 24A, 24B etc. in Figure 5.
  • FIGs 6 and 7 illustrate the application of the embodiment of the invention illustrated in Figure 3 to heat exchangers of the kind having two or three banks of passages, respectively.
  • the same features as those of the embodiments of Figures 4 and 5 have the same reference numerals.
  • the single secondary parting sheet 14, 24 etc. in each refluxing section is extended relative to the level of the adjacent corrugated sheets 12A, 12B, 22A, 22B etc., thus benefiting half the passages in each bank. All the passages may be benefited if each of the primary parting sheets 20, 30, 40, 50 etc. is also extended but ideally to a different level than that of the secondary parting sheet.
  • each pair of secondary parting sheets 14A, 14B, 24A, 24B, etc. in each refluxing section is extended below the level of the adjacent corrugated sheets.
  • both secondary parting sheets may be extended to the same level or, preferably, to different levels.
  • one or more of the primary parting sheets may be extended, the criterion for optimum improvement being that adjacent parting sheets (primary or secondary) are not extended to the same level.
  • the benefit of the invention may also be obtained for heat exchangers of the kind illustrated in Figures 4 and 6 by arranging for the bottom ends of the corrugated sheets 12A, 12B, 22A, 22B-etc. to be at a level above the bottom ends of the primary and secondary parting sheets 20, 30, 40, 50 etc and 14, 24, 34 etc.
  • heat exchangers of the kind having two or more banks of passages in a refluxing section it is also possible in heat exchangers of the kind having two or more banks of passages in a refluxing section to extend a combination of parting and corrugated sheets.
  • the invention is also applicable to heat exchangers having more than three banks of passages in a refluxing section.
  • the lowering of the droplet forming zone to a level at which droplet formation does not constrict the mouth of the passage may be achieved in other ways, e.g. by attaching strip- or wire-like extensions to the walls of the passages. Wire bundles may be used to form brush-like extensions.
  • the extension may be fixed to the bottom of the wall of the passage or at a location on the passage wall above the bottom. Furthermore, the extension need not be attached to the wall or even touch it provided that it is in sufficiently close proximity to the wall to permit liquid flowing down the wall to transfer to and continue to flow down the extension.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Power Steering Mechanism (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Separation By Low-Temperature Treatments (AREA)
EP85301197A 1984-03-13 1985-02-22 Wärmeaustauscher Withdrawn EP0155772A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8406530 1984-03-13
GB08406530A GB2155610A (en) 1984-03-13 1984-03-13 Heat exchanger

Publications (1)

Publication Number Publication Date
EP0155772A1 true EP0155772A1 (de) 1985-09-25

Family

ID=10558004

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85301197A Withdrawn EP0155772A1 (de) 1984-03-13 1985-02-22 Wärmeaustauscher

Country Status (3)

Country Link
EP (1) EP0155772A1 (de)
JP (1) JPS60213797A (de)
GB (1) GB2155610A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1457750A1 (de) * 2003-03-11 2004-09-15 SFC Smart Fuel Cell AG Flüssigkeitsabfuhr aus fluidführenden Einrichtungen
FR2895788A1 (fr) * 2006-01-03 2007-07-06 Commissariat Energie Atomique Echangeur de chaleur a plaques du type condenseur a drainage preferentiel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63154960U (de) * 1987-03-27 1988-10-12

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2111026B1 (de) * 1971-03-08 1972-08-03 Linde Ag Kondensator-Plattenwaermetauscher
FR2362355A1 (fr) * 1976-08-16 1978-03-17 Hitachi Ltd Echangeur de chaleur a plaques ondulees
GB1565817A (en) * 1975-12-19 1980-04-23 Hisaka Works Ltd Plate-type indirect heat exchangers

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1256964A (de) * 1968-06-28 1971-12-15
SE427214B (sv) * 1976-02-28 1983-03-14 Hisaka Works Ltd Kondensor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2111026B1 (de) * 1971-03-08 1972-08-03 Linde Ag Kondensator-Plattenwaermetauscher
GB1565817A (en) * 1975-12-19 1980-04-23 Hisaka Works Ltd Plate-type indirect heat exchangers
FR2362355A1 (fr) * 1976-08-16 1978-03-17 Hitachi Ltd Echangeur de chaleur a plaques ondulees

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PETRO-CHEM. ENGINEER, vol. 39, no. 9, August 1967, pages 25-26, Dallas, US; H.J.MIKUS: "Heat exchanger use" *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1457750A1 (de) * 2003-03-11 2004-09-15 SFC Smart Fuel Cell AG Flüssigkeitsabfuhr aus fluidführenden Einrichtungen
FR2895788A1 (fr) * 2006-01-03 2007-07-06 Commissariat Energie Atomique Echangeur de chaleur a plaques du type condenseur a drainage preferentiel

Also Published As

Publication number Publication date
GB2155610A (en) 1985-09-25
JPS60213797A (ja) 1985-10-26
GB8406530D0 (en) 1984-04-18

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE FR

17P Request for examination filed

Effective date: 19860319

17Q First examination report despatched

Effective date: 19860825

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19860905

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TOMLINSON, TERENCE RONALD

Inventor name: CUMMINGS, DONALD RAY