EP0660645A1 - Einrichtung zur induktiven Erwärmung einer Flüssigkeit - Google Patents

Einrichtung zur induktiven Erwärmung einer Flüssigkeit Download PDF

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Publication number
EP0660645A1
EP0660645A1 EP93403149A EP93403149A EP0660645A1 EP 0660645 A1 EP0660645 A1 EP 0660645A1 EP 93403149 A EP93403149 A EP 93403149A EP 93403149 A EP93403149 A EP 93403149A EP 0660645 A1 EP0660645 A1 EP 0660645A1
Authority
EP
European Patent Office
Prior art keywords
magnetic circuit
inductor
heating device
fluid
columns
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Withdrawn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
EP93403149A
Other languages
English (en)
French (fr)
Inventor
Philippe Faché
Georges Ferry
Olivier Halna Du Fretay
Joseph Roussel
Jany Petit
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
Orano Demantelement SAS
Original Assignee
Electricite de France SA
Compagnie Generale des Matieres Nucleaires 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, Compagnie Generale des Matieres Nucleaires SA filed Critical Electricite de France SA
Priority to EP93403149A priority Critical patent/EP0660645A1/de
Publication of EP0660645A1 publication Critical patent/EP0660645A1/de
Withdrawn legal-status Critical Current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
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/225—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating electrical central heating boilers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/16—Furnaces having endless cores

Definitions

  • the present invention relates to an induction heating device for an electrically conductive fluid.
  • the invention finds a particularly advantageous application in the field of metallurgy, of the steel industry, of chemistry, or also of the food industry, for the heating of fluids of corrosive nature.
  • acids or mixtures of acids are used in particular for pickling metal parts.
  • acids or mixtures of acids are used in particular for pickling metal parts.
  • acid or basic solutions are very often used at temperatures above room temperature.
  • the distillation of a mixture of chemical constituents in solution is obtained by heating said mixture to the boiling temperature of the mixture.
  • an electromagnetic heating device which makes it possible to heat fluids having a very high electrical conductivity.
  • This known device comprises a solenoid supplied by a periodic current at very high frequency and surrounding a tank containing the fluid to be heated. This fluid is then the seat of induced currents which cause the heating of said fluid.
  • the major drawback of such a device is that it is very inefficient.
  • document DE-C-318 484 discloses a device comprising a transformer, a primary formed by a winding supplied with alternating current and surrounding a branch of the transformer, and a secondary formed by a water circulation pipe in the form a spiral wrapped around another parallel branch of the transformer.
  • the spiral pipe is made of an insulating material and is closed on itself.
  • This device has several drawbacks.
  • such a device is not suitable for operating on an industrial scale where the rates are high since the quantity of water which it makes it possible to heat during a heating cycle is relatively small. because it is limited to the dimensions of the spiral water circulation pipe. In addition, the dimensions of the transformer do not allow operation at frequencies of the order of several hundred Hertz. Finally, this device causes significant electrical losses.
  • the invention provides an induction heating device which makes it possible to heat a large quantity of a current conducting fluid.
  • This device operates at medium frequency, that is to say a few hundred Hertz and uses a more efficient frequency converter, which makes it possible to reduce the intensity and the current losses, as well as the proportion of l magnetic energy required relative to the heating energy obtained.
  • said device comprises a magnetic circuit which makes it possible to channel and transport the magnetic flux created in the inductor.
  • a magnetic circuit which makes it possible to reinforce the effect of the inductor and to generate a f.e.m (electromotive force) induced large enough in said fluid to heat it.
  • said heating device according to the invention operates at medium frequency using an efficient frequency converter having an efficiency of the order of 85 to 95%.
  • the device according to the invention is more compact.
  • the tank made of insulating material makes it possible to heat a large quantity of water at a time.
  • the tank can advantageously consist of a material inert from the magnetic point of view, such as PTFE (Polytetrafluoroethylene) or PVDF (Polyvinyldifluorinated) or even glass.
  • PTFE Polytetrafluoroethylene
  • PVDF Polyvinyldifluorinated
  • the magnetic circuit is in the form of a frame comprising separable parts including a head and the means for resonating the converter are shims interposed between the head and the other parts carrying each magnetic circuit inductor.
  • the means for resonating the converter consist of an inductor placed outside the magnetic circuit, in parallel with the converter to which it is connected.
  • said magnetic circuit is in the form of a frame having two substantially parallel heating columns, around which two inductors and two tanks are placed respectively.
  • the closed magnetic circuit in the form of a frame having three columns, two lateral columns of section S and one central column of double section of said section S, among which is at least one column around which are placed a winding and a tank.
  • the magnetic circuit comprising a central column having a section S1 and a plurality of n peripheral columns arranged radially and having a section n times smaller than said section S1, said magnetic circuit comprising among said columns at least one column around which are placed a coil and a tank.
  • FIG. 1 shows a device for heating an electrically conductive fluid 10 having a conductivity greater than 1 Siemens / meter.
  • This heating device comprises a magnetic circuit 100 closed in the form of a frame, here a square frame of section S, comprising two columns 101, 102 substantially parallel.
  • the heating device comprises two inductors constituted by two coils 200, arranged respectively around the two columns 101, 102 of the magnetic circuit.
  • the magnetic circuit 100 can be adjusted accordingly to the characteristics of the frequency converter and of the fluid to be heated, and vice versa.
  • the device comprises two tanks here of parallelepiped shape, made of an insulating material, such as PTFE or glass, containing the fluid 10 to be heated.
  • the two tanks respectively surround the two columns 101, 102 of the magnetic circuit in such a way that the magnetic circuit heats the fluid by creating in the fluid 10 induced currents.
  • the magnetic circuit channels the magnetic flux created in each inductor, and generates an induced fem in the fluid 10.
  • the fluid 10 conducting current, in which each column 101, 102 is immersed behaves like a resistor. When said fluid 10 is crossed by the induced currents, it heats by Joule effect.
  • the columns 101, 102 are separable from the other parts of the closed frame and more particularly from the upper part 103, called the head.
  • the frequency converter operating at resonance conditions this assembly allows spacers, not shown in Figure 1, to be interposed between the head 103 and the rest of the magnetic circuit.
  • These shims represent means for resonating said frequency converter.
  • the assembly constituted by the inductors, the magnetic circuit and the fluid behaves like an electrical circuit composed of an inductance L in series with a resistance R, and the frequency converter consists of a voltage source parallel with a capacitor C.
  • the electrical diagram representative of the device shown in Figure 1 consists of the voltage source paralleled simultaneously with the capacitor C and the inductor L in series with the resistor R.
  • L ⁇ the product of the frequency converter.
  • said frequency converter is an efficient medium frequency converter with thyristors or transistors, having a yield of between approximately 85 and 95%.
  • the magnetic circuit 100 is constituted by magnetic sheets, such as silicon sheets, preferably having small thicknesses between 0.1 and 0.35 millimeter, so as to minimize the heating of said transformer.
  • said magnetic circuit consists of ferrites.
  • the latter in order to prevent the magnetic circuit 100 from heating up, the latter includes a cooling circuit.
  • said cooling circuit includes “heat pumps” constituted by copper plates 110 cooled on the banks using copper pipes 111 traversed by water 112.
  • heat pumps constituted by copper plates 110 cooled on the banks using copper pipes 111 traversed by water 112.
  • these "heat-pullers” are arranged parallel to said magnetic sheets.
  • FIG. 3 there is shown a second embodiment of a magnetic circuit 100 'forming part of a heating device according to the invention.
  • This magnetic circuit 100 'closed in the form of a frame, has three columns 101', 102 ', 103', two lateral columns 101 ', 103' of section S and a central column 102 'having a section 2S double of said section S.
  • a column 102 ′ carrying a coil 200 is a column 102 ′ carrying a coil 200.
  • This circuit with three columns makes it possible to channel with better efficiency the magnetic flux created by the coil 200.
  • an electric induction heating device comprising a magnetic circuit comprising a central column of section S principal and a plurality of n peripheral columns arranged radially and having a section n times weaker than section S1.
  • This magnetic circuit has several columns, each carrying an inductor, and care must be taken to ensure that the magnetic fluxes created by the inductors add up well.
  • FIG 4 there is shown in detail an example of flow of the fluid 10 to be heated, around the column 102 of said heating device of Figure 1.
  • a fluid supply line not shown, we creates, using a nurse 130 placed in the tank 300, two flow veins 10 a , 10 b of said fluid 10 around said column 102, substantially perpendicular to said column. These two flow streams in parallel, converge at the outlet 120 of said tank 300 towards a collector not shown.
  • FIGS. 5 and 6 the flow of the fluid 10 has been shown around the columns 101, 102 of the magnetic circuit of FIG. 1. Likewise, the flow of the fluid is substantially perpendicular to the said columns and has a distribution in three veins fluid flow 10 a , 10 b , 10 c in parallel, perpendicular to said columns. In this case, the distribution is carried out using a reservoir 20.
  • each tank 300 has a cylindrical shape and comprises in the lower part an inlet 301 of the fluid 10 and in the upper part an outlet 302 of the said fluid 10, so as to create a cylindrical flow stream of the fluid substantially parallel to each column 101, 102.
  • FIG. 9 another variant of the embodiment of the device in FIG. 7 has been shown.
  • the tank 300 has a substantially cylindrical shape, comprising two recesses so as to surround the two columns 101, 102.
  • the tank also comprises means for entering and leaving the fluid 10, not shown, so that the fluid 10 flows in two substantially cylindrical flow streams parallel respectively to said columns 101, 102.
  • FIGS. 7, 8 and 9 have a heating efficiency which can reach 85%.
  • FIG. 10 shows another embodiment of the heating device, comprising a central column 104 a and three peripheral columns 101 a , 102 a , 103 a , arranged radially.
  • Said peripheral columns have a section S, and the central column then has a section equal to three times said section S. All the columns carry a winding.
  • said device comprises a tank comprising four recesses surrounding the four columns and containing the fluid 10.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • General Induction Heating (AREA)
EP93403149A 1993-12-23 1993-12-23 Einrichtung zur induktiven Erwärmung einer Flüssigkeit Withdrawn EP0660645A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP93403149A EP0660645A1 (de) 1993-12-23 1993-12-23 Einrichtung zur induktiven Erwärmung einer Flüssigkeit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP93403149A EP0660645A1 (de) 1993-12-23 1993-12-23 Einrichtung zur induktiven Erwärmung einer Flüssigkeit

Publications (1)

Publication Number Publication Date
EP0660645A1 true EP0660645A1 (de) 1995-06-28

Family

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Family Applications (1)

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EP93403149A Withdrawn EP0660645A1 (de) 1993-12-23 1993-12-23 Einrichtung zur induktiven Erwärmung einer Flüssigkeit

Country Status (1)

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EP (1) EP0660645A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19728763A1 (de) * 1997-07-07 1999-01-14 Reitter & Schefenacker Gmbh Schaltungseinrichtung zum Schutz von strombetriebenen Leuchtmitteln, insbesondere von LEDs, zu Signal- oder Beleuchtungszwecken
RU2138137C1 (ru) * 1998-02-11 1999-09-20 Карманов Евгений Дмитриевич Индукционный нагреватель текучих сред
US7731689B2 (en) 2007-02-15 2010-06-08 Baxter International Inc. Dialysis system having inductive heating
US8803044B2 (en) 2003-11-05 2014-08-12 Baxter International Inc. Dialysis fluid heating systems

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE318484C (de) * 1917-10-14 1920-01-31
FR516444A (fr) * 1917-10-12 1921-04-19 Oluf Christian Boeckman Perfectionnements aux fours à induction électriques
FR1600320A (de) * 1968-12-31 1970-07-20

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR516444A (fr) * 1917-10-12 1921-04-19 Oluf Christian Boeckman Perfectionnements aux fours à induction électriques
DE318484C (de) * 1917-10-14 1920-01-31
FR1600320A (de) * 1968-12-31 1970-07-20

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19728763A1 (de) * 1997-07-07 1999-01-14 Reitter & Schefenacker Gmbh Schaltungseinrichtung zum Schutz von strombetriebenen Leuchtmitteln, insbesondere von LEDs, zu Signal- oder Beleuchtungszwecken
RU2138137C1 (ru) * 1998-02-11 1999-09-20 Карманов Евгений Дмитриевич Индукционный нагреватель текучих сред
US8803044B2 (en) 2003-11-05 2014-08-12 Baxter International Inc. Dialysis fluid heating systems
US7731689B2 (en) 2007-02-15 2010-06-08 Baxter International Inc. Dialysis system having inductive heating

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