EP0120630A1 - Kondensationsverfahren in Röhren - Google Patents

Kondensationsverfahren in Röhren Download PDF

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Publication number
EP0120630A1
EP0120630A1 EP84301467A EP84301467A EP0120630A1 EP 0120630 A1 EP0120630 A1 EP 0120630A1 EP 84301467 A EP84301467 A EP 84301467A EP 84301467 A EP84301467 A EP 84301467A EP 0120630 A1 EP0120630 A1 EP 0120630A1
Authority
EP
European Patent Office
Prior art keywords
tubes
flow
vapour
tube
condensate
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Withdrawn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
EP84301467A
Other languages
English (en)
French (fr)
Inventor
John Alexander Richardson Henry
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.)
UK Secretary of State for Trade and Industry
Original Assignee
UK Secretary of State for Trade and Industry
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 UK Secretary of State for Trade and Industry filed Critical UK Secretary of State for Trade and Industry
Publication of EP0120630A1 publication Critical patent/EP0120630A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/62—Component parts or details of steam boilers specially adapted for steam boilers of forced-flow type
    • F22B37/70—Arrangements for distributing water into water tubes
    • F22B37/74—Throttling arrangements for tubes or sets of tubes
    • 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
    • F28B1/06—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using air or other gas as the cooling medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B9/00—Auxiliary systems, arrangements, or devices
    • F28B9/04—Auxiliary systems, arrangements, or devices for feeding, collecting, and storing cooling water or other cooling liquid
    • 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
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/08—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by varying the cross-section of the flow channels

Definitions

  • This invention relates to a heat exchange process of the kind in which a vapour is caused to flow in parallel paths through a number of tubes, so as to transfer heat to an external fluid flowing over the outer surface of the tubes.
  • the fluid within the tubes thus condenses as it gives up latent heat to the external fluid.
  • This arrangement is common in air-cooled or shell and tube condensers which are often used, for example, in chemical-plants.
  • the result can be that in some tubes, all of the vapour is condensed before it reaches the far end of the tube.
  • Such vapour may partially condense on supercooled liquid issuing from other tubes.
  • Some of the vapour which has failed to condense may also, however, enter other tubes, in which condensation is complete before reaching the far end.
  • This-latter vapour then travels along such tubes in the reverse direction, and condenses. There will thus be a point in such tubes where vapour flows meet from both directions. This leads to a severe problem, in that a small proportion non-condensible gas is inevitably present in the vapour.
  • this gas is caught between two flows, it is not swept out of the tube, but tends to accumulate at the meeting point, so that eventually a substantial length of the tube becomes occluded by an immobile body of non-condensing gas.
  • This length of the tube thus becomes ineffective for condensing vapour, and the thermal efficiency of the heat exchanger is thus substantially reduced.
  • the condensate flowing through this length of tube continues to be cooled, and in some cases may freeze leading to total occlusion of the whole tube.
  • the problem is particularly acute where the vapour is at less than atmospheric pressure, since any leaks will result in an increase in the proportion of non-condensible gas present.
  • the present invention provides a different solution to the problem.
  • the present invention provides a heat exchange process comprising the steps of
  • the restriction provided by the fluid flow restrictors should normally not be substantially more severe than necessary in order to meet the objective. This will have the effect of preventing any reverse flow of vapour into a tube from the outlet manifold.
  • the restrictors will also have the effect of increasing the pressure drop in each tube, which can have a beneficial effect on flow distribution in the tubes.
  • the restrictors are provided in the form of removable inserts. Cleaning of the vapour tubes is thus facilitated.
  • an air-cooled heat exchanger comprises a plurality of vapour tubes 1, through which a vapour to be condensed flows from a common inlet manifold 2 to a common outlet manifold 3.
  • a vapour to be condensed flows from a common inlet manifold 2 to a common outlet manifold 3.
  • a supply of coolant fluid in this instance ambient air, is caused to flow over and around the exterior surfaces of the tubes 1, in the direction indicated in Fig 1 by the arrow 'A'.
  • This can be arranged, for example by means of a fan, or by natural convection, and the tubes 1 can if desired be positioned within a duct for constraining the coolant flow.
  • Each tube 1 is provided with a flow restrictor 4, in the form of a removable insert positioned in the downstream end of each tube.
  • the inserts 4 are all identical, and the size of the restriction therein is such that for the intended conditions of operation of the heat exchanger, the flow rate of vapour in each tube 1 will result in a flow of condensate at the downstream end just sufficient to fill the restrictor substantially completely with condensate 5 (ie across its entire cross-section). If the degree of restriction is insufficient the flow of condensate will not be enough to fill the restrictor and vapour will then be able to flow back down the tube concerned in the reverse direction with the disadvantages noted hereinbefore. A greater degree of restriction can be tolerated more readily, but should be avoided as far as possible, in that any undue restriction of the flow is undesirable.

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)
EP84301467A 1983-03-18 1984-03-06 Kondensationsverfahren in Röhren Withdrawn EP0120630A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8307568 1983-03-18
GB838307568A GB8307568D0 (en) 1983-03-18 1983-03-18 Heat exchangers

Publications (1)

Publication Number Publication Date
EP0120630A1 true EP0120630A1 (de) 1984-10-03

Family

ID=10539831

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84301467A Withdrawn EP0120630A1 (de) 1983-03-18 1984-03-06 Kondensationsverfahren in Röhren

Country Status (4)

Country Link
EP (1) EP0120630A1 (de)
JP (1) JPS6036888A (de)
CA (1) CA1197209A (de)
GB (2) GB8307568D0 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0488096A1 (de) * 1990-11-29 1992-06-03 Richard Vetter Röhrenwärmeaustauscher
US9562722B2 (en) 2009-03-13 2017-02-07 Carrier Corporation Manifold assembly for distributing a fluid to a heat exchanger

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6438590A (en) * 1987-08-04 1989-02-08 Toshiba Corp Heat exchanger
US5113933A (en) * 1990-10-10 1992-05-19 Larinoff Michael W Air-cooled vacuum steam condenser bundle isolation
DE4330361A1 (de) * 1993-09-08 1995-03-09 Richard Vetter Röhrenwärmeaustauscher
JP2009222285A (ja) * 2008-03-14 2009-10-01 Tlv Co Ltd 空気加熱装置
JP2009222286A (ja) * 2008-03-14 2009-10-01 Tlv Co Ltd 空気加熱装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR795801A (fr) * 1934-12-24 1936-03-23 Perfectionnement aux chaudières à tubes d'eau
US2310234A (en) * 1939-09-27 1943-02-09 United Eng & Constructors Inc Gas condenser
US2694385A (en) * 1952-10-06 1954-11-16 Combustion Eng Size identified mounting means for flow restricting orifices
FR1079141A (fr) * 1953-04-09 1954-11-25 Thermo Mecanique Perfectionnements apportés aux faisceaux tubulaires
DE1811596A1 (de) * 1968-01-15 1969-08-07 Waagner Biro Ag Verfahren und Einrichtung zur Vergleichmaessigung des Waermeueberganges

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR795801A (fr) * 1934-12-24 1936-03-23 Perfectionnement aux chaudières à tubes d'eau
US2310234A (en) * 1939-09-27 1943-02-09 United Eng & Constructors Inc Gas condenser
US2694385A (en) * 1952-10-06 1954-11-16 Combustion Eng Size identified mounting means for flow restricting orifices
FR1079141A (fr) * 1953-04-09 1954-11-25 Thermo Mecanique Perfectionnements apportés aux faisceaux tubulaires
DE1811596A1 (de) * 1968-01-15 1969-08-07 Waagner Biro Ag Verfahren und Einrichtung zur Vergleichmaessigung des Waermeueberganges

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0488096A1 (de) * 1990-11-29 1992-06-03 Richard Vetter Röhrenwärmeaustauscher
US9562722B2 (en) 2009-03-13 2017-02-07 Carrier Corporation Manifold assembly for distributing a fluid to a heat exchanger

Also Published As

Publication number Publication date
JPS6036888A (ja) 1985-02-26
CA1197209A (en) 1985-11-26
GB8406204D0 (en) 1984-04-11
GB2137330B (en) 1986-04-09
GB8307568D0 (en) 1983-04-27
GB2137330A (en) 1984-10-03

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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): DE FR GB IT NL SE

17P Request for examination filed

Effective date: 19850129

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: 19860602

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HENRY, JOHN ALEXANDER RICHARDSON