EP0637723B1 - Dispositif échangeur pour le chauffage d'un fluide visqueux - Google Patents

Dispositif échangeur pour le chauffage d'un fluide visqueux Download PDF

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Publication number
EP0637723B1
EP0637723B1 EP94401761A EP94401761A EP0637723B1 EP 0637723 B1 EP0637723 B1 EP 0637723B1 EP 94401761 A EP94401761 A EP 94401761A EP 94401761 A EP94401761 A EP 94401761A EP 0637723 B1 EP0637723 B1 EP 0637723B1
Authority
EP
European Patent Office
Prior art keywords
external
internal
pipe
pipes
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.)
Expired - Lifetime
Application number
EP94401761A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0637723A1 (fr
Inventor
Michel Gorse
Bernard Creton
Hervé Rivoalen
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.)
Electricite de France SA
Original Assignee
Electricite de France 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 Electricite de France SA filed Critical Electricite de France SA
Publication of EP0637723A1 publication Critical patent/EP0637723A1/fr
Application granted granted Critical
Publication of EP0637723B1 publication Critical patent/EP0637723B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/101—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using electric energy supply
    • F24H1/102—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using electric energy supply with resistance
    • F24H1/105—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using electric energy supply with resistance formed by the tube through which the fluid flows

Definitions

  • the invention relates to the heating of viscous food fluids circulating in an annular space heated by Joule effect. An application is planned for the sterilization of said food products.
  • thermorheological especially fluids called "non Newtonian”. Heating methods of such fluids generally use exchangers tubular, plate heat exchangers or injection of steam.
  • the profile thermal in steady state has a parabolic shape.
  • the viscous fluid has a temperature close to that of the wall and in the heart of flow, the temperature may be lower by several tens of degrees. This heterogeneity of temperature is incompatible with treatment quality thermal (like sterilizing a agro-food product).
  • the object of the invention is to remedy these disadvantages by proposing an exchanger device for heating a viscous fluid in a pipeline, but of different design.
  • the heating means consist of energizing and in parallel the two pipes which are then electrically mounted in parallel, the holding means ensuring the passage of the electric current from the external pipe in the internal pipeline.
  • the holding means are fins fixed longitudinally between the two pipes.
  • the fins are used by three and are laid radially at 120 ° from each other.
  • these fins have an electrical resistance much lower than that of the internal pipeline.
  • connection piece perpendicular to the external surface of the external pipe.
  • external pipe is reinforced by a sleeve for support each connection piece and avoid local overheating of the external pipe.
  • the device according to the invention can be present in two different general forms.
  • a first consists of several sections of pipes connected in series, each section comprising an internal pipe, a external pipe and two connecting pieces electric.
  • the sections are connected to each other through elbows.
  • each section comprising an internal pipe and a external pipe; a connecting piece is placed at each end of the device.
  • a section of the device according to the invention mainly comprises an internal pipe 1 and an external pipe 2. These two pipes 1 and 2 are mounted concentric, i.e. they have the same positioning axis 6.
  • the internal pipe 1 defines an internal space 4 which will remain empty during use of the device.
  • the space ring 3 between the internal pipes 1 and external 2 is that in which the fluid circulates viscous to heat.
  • the horizontal arrows symbolize the passage of this fluid between the two walls of this annular space 3.
  • radial fins 5 are used arranged longitudinally between the two pipes.
  • it is a group of three fins 5 which is shown, each angularly arranged with respect to each other, at 120 ° around the longitudinal axis 6 of the section. They are welded to the inner wall 1 and to the outer wall 2.
  • the electrical connection of a section is made using at least one connecting piece electric 7 fixed to the external pipe 2.
  • a sleeve 8 fixed around, or replacing the pipe external 2, as shown in Figure 1.
  • the sleeve 8 has an internal diameter corresponding to the internal diameter of the external pipe 2.
  • the fins 5 provide also the passage of electric current from the external pipeline in internal pipeline 1. From this fact, the internal 1 and external 2 pipes are electrically connected in parallel. To get a good distribution of electric current in the section, the fins 5 must have a resistance much lower than those of the pipeline internal 1.
  • This device therefore has the advantage of show only a reduced temperature difference between the fluid close to the walls and the fluid located far from pipe walls. We also benefit from a reduction of the temperature difference between the walls internal 1 and external 2 and fluid lines, this reduction being linked to the decrease in heat flux density.
  • the device presents also some advantages, such as the absence of inertia in operation and precise control of the temperature difference between the walls and the fluid viscous. In addition, no electrical insulation is necessary in this device.
  • a first embodiment of the exchanger device is an assembly of several sections mounted in series. Each section has at its two ends 10A and 10B a connecting piece 7 to obtain the passage of current in the two pipes of the section 10.
  • Each second end 10B of a section is connected to one end 10A of a following section by means an elbow 11 which, for its part, is not traversed by the electric current.
  • the end 10B of the last section 10 N is not connected to an elbow, but constitutes the output of the device.
  • a second realization of the device according to the invention consists in mount different sections 10 in parallel. Each section is connected to a viscous fluid supply 12 by its first end 10A. Every second end 10B of sections 10 is connected to an outlet of fluid 13. Each section 10 is of course equipped of connecting pieces 7 so that the current electric can run through both pipes internal and external to heat the viscous fluid.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP94401761A 1993-08-03 1994-08-01 Dispositif échangeur pour le chauffage d'un fluide visqueux Expired - Lifetime EP0637723B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9309551A FR2708726B1 (fr) 1993-08-03 1993-08-03 Dispositif échangeur pour le chauffage d'un fluide visqueux.
FR9309551 1993-08-03

Publications (2)

Publication Number Publication Date
EP0637723A1 EP0637723A1 (fr) 1995-02-08
EP0637723B1 true EP0637723B1 (fr) 1999-02-03

Family

ID=9449896

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94401761A Expired - Lifetime EP0637723B1 (fr) 1993-08-03 1994-08-01 Dispositif échangeur pour le chauffage d'un fluide visqueux

Country Status (7)

Country Link
EP (1) EP0637723B1 (el)
AT (1) ATE176523T1 (el)
DE (1) DE69416357T2 (el)
DK (1) DK0637723T3 (el)
ES (1) ES2129601T3 (el)
FR (1) FR2708726B1 (el)
GR (1) GR3030050T3 (el)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2738443B1 (fr) * 1995-08-28 1997-10-03 Electricite De France Element de connexion pour echangeur electrique annulaire
NO984235L (no) * 1998-09-14 2000-03-15 Cit Alcatel Oppvarmingssystem for metallrør for rõoljetransport

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1727585A (en) * 1927-08-23 1929-09-10 Robert A Carleton Fluid heating and vaporizing apparatus
DE919184C (de) * 1951-12-20 1954-10-14 Hermann Waste Einrichtung zum Erhitzen von Gasen, Daempfen und Fluessigkeiten
FR1239842A (fr) * 1959-11-04 1960-08-26 Cie Ind D Applic Electro Mecan Procédé pour la pasteurisation des produits gras, crémeux ou visqueux et machine pour la mise en oeuvre de ce procédé ou procédé similaire
BE634154A (el) * 1962-06-27
GB2084284B (en) * 1980-09-22 1984-08-15 Showa Denki Kogyo Co Ltd Heated pipeline
US4425936A (en) * 1982-08-02 1984-01-17 Thermon Manufacturing Company Concentric tube heat tracing apparatus
AU550594B2 (en) * 1983-06-16 1986-03-27 Colin Maxwell Finch High power electric heater
FR2664784A1 (fr) * 1990-07-12 1992-01-17 Doat Robert Rechauffeur de fluide utilisant des tubes chauffes par effet joule qui transmettent leur energie simultanement par leurs faces interne et externe.

Also Published As

Publication number Publication date
DE69416357T2 (de) 1999-08-26
DE69416357D1 (de) 1999-03-18
EP0637723A1 (fr) 1995-02-08
FR2708726A1 (fr) 1995-02-10
ES2129601T3 (es) 1999-06-16
FR2708726B1 (fr) 1995-09-01
GR3030050T3 (en) 1999-07-30
DK0637723T3 (da) 1999-09-20
ATE176523T1 (de) 1999-02-15

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