EP0216831B1 - Echangeur de chaleur - Google Patents

Echangeur de chaleur Download PDF

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Publication number
EP0216831B1
EP0216831B1 EP19860901823 EP86901823A EP0216831B1 EP 0216831 B1 EP0216831 B1 EP 0216831B1 EP 19860901823 EP19860901823 EP 19860901823 EP 86901823 A EP86901823 A EP 86901823A EP 0216831 B1 EP0216831 B1 EP 0216831B1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
helical
inlet
outlet
cylindrical 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.)
Expired
Application number
EP19860901823
Other languages
German (de)
English (en)
Other versions
EP0216831A1 (fr
Inventor
Niels Thagaard
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.)
BIGADAN HOJBOGARD BIOGASTEKNOLOGI AS
Original Assignee
BIGADAN HOJBOGARD BIOGASTEKNOLOGI AS
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 BIGADAN HOJBOGARD BIOGASTEKNOLOGI AS filed Critical BIGADAN HOJBOGARD BIOGASTEKNOLOGI AS
Priority to AT86901823T priority Critical patent/ATE38894T1/de
Publication of EP0216831A1 publication Critical patent/EP0216831A1/fr
Application granted granted Critical
Publication of EP0216831B1 publication Critical patent/EP0216831B1/fr
Expired 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
    • 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
    • F28D7/02—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 helically coiled
    • F28D7/022—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 helically coiled the conduits of two or more media in heat-exchange relationship being helically coiled, the coils having a cylindrical configuration

Definitions

  • the present invention relates to a heat exchanger with a double helical passage formed by two helical surfaces which are connected with their inner edges to a core and with their outer edges to a cylindrical wall of a casing so as to create the flows of a first heat exchange medium and a second heat exchange medium, both helical surfaces having the same angle of pitch, and with an inlet and an outlet for each of the flows, which inlet and outlet connects the double helical passage with supply and discharge pipes of the heat exchanger.
  • the heat exchanger is especially intended for use in the exchange of heat, preferably in counter flow, between flowable media, particularly between media that are employed as materials in a process for biogas production, and media that have been employed in such a process.
  • the heat exchanger according to the invention is not limited to the above mentioned use, but can be used in other fields.
  • a heat exchanger of the above mentioned type is principally known from DE-C-178 080.
  • no directions are given, however, for the construction of the inlets and the outlets or the connection of the inlets and outlets to the helical passages of the heat exchanger.
  • the inlet and outlet may connect the double helical passage with supply and discharge pipes on the heat exchanger.
  • the features characteristic of the invention are that the inlet and the outlet are constructed substantially without change of the cross-sectional area from the helical passage through the inlet/outlet to the supply and discharge pipes, that the inlet and the outlet consist of pipe stubs the front walls of which are directed tangentially to the cylindrical wall and disposed in a plane which together with a plane perpendicular to the longitudinal axis of the helical passages forms an angle which substantially corresponds to the angle of pitch of the helical surfaces and that at the end of each stub a guide plate is provided between two adjacent helical surfaces, said guide plate extending tangentially from the core towards the cylindrical wall of the casing.
  • inlet and the outlet according to the present invention may be connected to the cylindrical wall of the casing or the end of the casing.
  • the pipe stubs are connected directly with the mouth of a helical passage, which mouth is provided at the end of the casing and is defined by the end of the cylindrical wall, the core and the ends of the two helical surfaces so that it becomes unnecessary to provide guide plates or the like means.
  • the pipe stubs are connected directly with the mouth, care should be taken that the inlet and the outlet are so directed as above mentioned in order to ensure the optimum flow conditions.
  • the supply to and discharge from a heat exchanger consisting of a plurality of units can be provided by means of pipe stubs connected directly with the mouths of the helical passages, while the mutual connection of the units is provided by means of pipe stubs connected with the cylindrical walls of the individual casings.
  • This heat exchanger 1 has two helical passages 2, 3 formed by two helical surfaces 4, 5, which are provided in the form of two plate strips, which are helically coiled and are welded along their inner edges to a core in the form of a tube 6, while their outer edges are welded to the cylindrical wall 10 of the casing 7.
  • the two plate strips 4, 5 have the same angle of pitch 8 and are arranged substantially midway between one another so that the helical passages have approximately equal cross-sectional areas.
  • the cylindrical wall 10 may either consist of a cylindrical tube or may be provided in the form of coiled plate strips, which are welded to the outer edges of the plate strips 4, 5 so as to close the spaces between the plate strips 4, 5 and thereby to provide the helical passages 2, 3.
  • the plate strips 4, 5 may alternatively be arranged at a displacement relative to one another so that the helical passages 2, 3 will have different cross-sectional areas.
  • an inlet 8 and an outlet 9 are welded to the cylindrical wall 10 of the casing 7 in such a manner that there will be no sudden changes of direction, cavities or substantial changes of the cross-sectional area.
  • a window is provided in the wall 10 for each of the pipe stubs 8, 9.
  • the window which extends across an angle of approximately 90°, is delimited at a first side by a first generatrix 12 of the cylindrical wall 10.
  • the first generatrix 12 is located at the line of intersection between a tangential plane to the cylindrical wall and the wall 10 itself.
  • the window has a width corresponding to the distance between two adjacent plate strips 4, 5 and is thus delimited in the longitudinal direction of the heat exchanger by two edges 13, 14 located at the welding line between the plate strips and the wall.
  • the last side of the window is delimited by a second generatrix 15 of the cylindrical wall 10.
  • the second generatrix 15 is located at the point of intersection between the wall 10 and a plane, which is parallel to the beforementioned tangential plane, and which is a tangential plane to the tube 6.
  • the pipe stubs 8, 9 are arranged in such a manner that a front wall 16, as viewed from the end (see Fig. 2), is directed tangentially relatively to the wall 10 of the casing 7 and is welded to this wall along the first generatrix 12.
  • the pipe stubs 8, 9 have two side walls 18, 19 which connect the front wall and the rear wall and are welded to the wall 10 along the edges 13 and 14.
  • the pipe stubs 8, 9 are arranged in a plane, which together with a plane perpendicular to the longitudinal axis of the helical passages forms an angle 8 (see Fig. 1), which is identical to the angle of pitch ⁇ of the plate strips 4, 5 (see Fig. 3).
  • the pipe stubs 8, 9 are gradually changed to a circular shape (not shown) from the approximately polygonal shape at the connection with the wall 10, whereby it becomes possible to connect the heat exchanger with other equipment by means of conventionally produced cylindrical pipes (not shown).
  • the pipe stubs 8, 9 are shown with an exaggerated length and can be shorter than shown.
  • two guide plates 20, 21 are connected by welding between two adjacent plate strips 4, 5, and these guide plates are directed tangentially relatively to the tube 6.
  • the guide plate 20 is moreover welded to a first generatrix 22 of the tube 6 and the above mentioned second generatrix 15 of the cylindrical wall 10.
  • the heat exchanger constructed as above described will have very advantageous flow conditions, and it is particularly suitable for use in the exchange of heat between materials employed in a process for biogas production, and materials that have been used in such a process.
  • inhomogenous mass there will be a minimum of precipitation and deposition owing to good flow conditions, and consequently it will rarely be necessary to clean the heat exchanger by flushing. Should it still become necessary to clean the heat exchanger, this can easily be done by flushing, because the cleaning medium can be passed in and out through the pipe stubs 8 and 9 and produce a sweeping of all interior surfaces.
  • the heat exchanger according to the invention can also be constructed in other ways.
  • the pipe stubs can be welded directly to the mouth of the helical passages as long as the orientation of the pipe stubs in space, as above described, is observed.

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

Un échangeur de chaleur (1) conçu pour être utilisé en particulier pour l'échange de chaleur entre des matériaux qui seront employés dans un processus de production de biogaz et des matériaux déjà employés dans un tel processus comprend deux passages hélicoïdaux (2, 3) formés par deux bandes plates (4, 5) soudées à un noyau (6) et à un boîtier cylindrique (7), les deux ayant approximativement le même angle de pas . Afin d'éviter la formation de dépôts et l'obstruction, il faut aussurer de bonnes conditions d'écoulement. Les bouts (8) des tuyaux d'admission et des bouts (9) des tuyaux d'admission et les bouts (9) des tuyaux d'évacuation de l'échangeur de chaleur sont donc connectés aux passages hélicoïdaux (2, 3) sans qu'il n'y ait guère de changement dans la zone de la section transversale à travers les bouts (8, 9) des tuyaux et les passages hélicoïdaux (2, 3).

Claims (5)

1. Echangeur de chaleur (1) avec un passage en double hélice (2, 3) formé par deux surfaces hélicoïdales (4, 5) qui sont reliées par leurs bords internes à un noyau (6) et par leurs bords externes à une paroi cylindrique (10) d'un logement (7) de façon à créer les écoulements d'un premier milieu d'échange de chaleur et d'un second milieu d'échange de chaleur, les deux surfaces hélicoïdales ayant le même angle de pas, et avec une entrée (8) et une sortie (9) pour chacun ces écoulements, lesdites entrée et sortie reliant le passage en double hélice (2, 3) à des tubes d'alimentation et d'évacuation de l'échangeur de chaleur, caractérisé en ce que l'entrée (8) et la sortie (9) sont construites sensiblement sans changement de l'aire en section transversale depuis le passage hélicoïdal (2, 3) à travers l'entrée/sortie (8, 9) vers les tubes d'alimentation et d'évacuation, en ce que l'entrée (8) et la sortie (9) consistent en tronçons de tube dont les parois frontales (16) sont dirigées tangentiellement par rapport à la paroi cylindrique (10) et sont disposées dans un plan qui forme avec un plan perpendiculaire à l'axe longitudinal des passages hélicoïdaux (2, 3) un angle 6 qui correspond sensiblement à l'angle de pas des surfaces hélicoïdales (4, 5) et en ce qu'à l'extrémité de chaque tronçon est prévue une plaque de guidage (20, 21) entre deux surfaces hélicoïdales adjacentes, ladite plaque de guidage s'étendant tangentiellement à partir du noyau (6) vers la paroi cylindrique (10) du logement (7).
2. Echangeur de chaleur selon la revendication 1, caractérisé en ce que les tronçons de tube sont reliées directement à l'embouchure d'un passage hélicoïdal, ladite embouchure étant prévue à l'extrémité du logement et étant définie par l'extrémité de la paroi cylindrique (10), le noyau (6) et les extrémités des deux surfaces hélicoïdales (4, 5).
3. Echangeur de chaleur selon l'une des revendications précédentes, caractérisé en ce que les aires en section transversale des deux passages en hélice (2, 3) sont sensiblement égales.
4. Echangeur de chaleur selon l'une quelconque des revendications précédentes, caractérisé en ce que les tronçons de tube changent graduellement d'une section transversale sensiblement polygonale à leur connexion avec l'échangeur de chaleur à une section transversale sensiblement circulaire à leur connexion avec les tubes d'alimentation et d'évacuation de l'échangeur de chaleur.
5. Echangeur de chaleur selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est connecté en série à un ou plusieurs échangeurs de chaleur similaires en agencement côte à côte.
EP19860901823 1985-03-06 1986-03-06 Echangeur de chaleur Expired EP0216831B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86901823T ATE38894T1 (de) 1985-03-06 1986-03-06 Waermeaustauscher.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK102085A DK102085A (da) 1985-03-06 1985-03-06 Varmeveksler
DK1020/85 1985-03-06

Publications (2)

Publication Number Publication Date
EP0216831A1 EP0216831A1 (fr) 1987-04-08
EP0216831B1 true EP0216831B1 (fr) 1988-11-23

Family

ID=8100091

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860901823 Expired EP0216831B1 (fr) 1985-03-06 1986-03-06 Echangeur de chaleur

Country Status (4)

Country Link
EP (1) EP0216831B1 (fr)
DE (1) DE3661295D1 (fr)
DK (1) DK102085A (fr)
WO (1) WO1986005262A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2304580C2 (ru) 2002-07-29 2007-08-20 Ф.Хоффманн-Ля Рош Аг Новые бензодиоксолы

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE178080C (fr) *
US2060936A (en) * 1936-02-15 1936-11-17 Todd Comb Equipment Inc Heat exchange means
US2341319A (en) * 1941-10-31 1944-02-08 Lummus Co Heat exchanger
DE2364500A1 (de) * 1973-12-24 1975-07-03 Agfa Gevaert Ag Kombinierter waermeaustauscher und mischer
FR2479955A1 (fr) * 1980-04-04 1981-10-09 Joguet Jean Dispositif de climatisation d'habitation
FR2539498B1 (fr) * 1983-01-18 1988-01-22 Jcm Ind Sarl Dispositif de recuperation de chaleur

Also Published As

Publication number Publication date
DE3661295D1 (en) 1988-12-29
EP0216831A1 (fr) 1987-04-08
DK102085A (da) 1986-09-07
DK102085D0 (da) 1985-03-06
WO1986005262A1 (fr) 1986-09-12

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