EP1393595A1 - Microwave continuous water heater - Google Patents
Microwave continuous water heaterInfo
- Publication number
- EP1393595A1 EP1393595A1 EP02778874A EP02778874A EP1393595A1 EP 1393595 A1 EP1393595 A1 EP 1393595A1 EP 02778874 A EP02778874 A EP 02778874A EP 02778874 A EP02778874 A EP 02778874A EP 1393595 A1 EP1393595 A1 EP 1393595A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- microwave
- applicator
- dielectric tube
- water heater
- dielectric
- 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- Withdrawn
Links
Classifications
-
- 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
- H05B6/64—Heating using microwaves
- H05B6/80—Apparatus for specific applications
- H05B6/802—Apparatus for specific applications for heating fluids
-
- 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
- H05B6/64—Heating using microwaves
- H05B6/70—Feed lines
Definitions
- the invention relates to a microwave water heater for heating fluid media.
- the microwave is suitable for heating in a variety of ways. It is therefore used in the food industry, in the household, in medicine, in industrial material processing in different ways, be it that a process good is simply illuminated, or that an applicator is part of a microwave technology system for heating, such as that well-known household microwave or for tempering and thermostatting a heating bath in material processing.
- the latter is known from DE 199 35 387 AI.
- the microwave applicator is attached to a side wall of the basin, which has a side wall in common with the basin.
- This wall consists of a grid that has a mesh size that no longer allows the microwave to pass through, but that the liquid in the bath in the actual useful pool and the applicator can circulate through the grid wall or be circulated.
- Such structures are quite complex if the microwave technology part and the usable area form a structural unit from the outside. This is accompanied by protective measures that have to be given due attention due to the spatial confinement.
- DE 697 01 702 T2 specifies a process for the decomposition of polymers to monomers, with the polymer initially lymer is located in a quartz tube that protrudes through the microwave cavity that closes off a waveguide system.
- DE 199 25 -493 C1 presents a linearly extended arrangement for large-area microwave treatment and for large-area plasma generation.
- One embodiment consists of a cavity resonator with an elliptical cross section, along which a linear stretched microwave antenna is present along a focal line. This is surrounded by a dielectric which is inert to the environment and which is permeable to microwaves.
- a microwave-permeable tube also runs as a load, in which lies a workpiece to be treated, which is exposed therein to the plasma generated by the microwave.
- DE 196 06 517 C2 presents a pressure reactor with microwave heating for continuous operation. It consists of individual cells that are fitted with microwave transmit antennas and have mass-related partition walls. Pipes made of microwave-transparent material pass through the partitions and cells, which pass outside into metal pipelines. The medium flows in these tubes, which is heated by the action of the microwave, which is coupled in chambers. Chamber row is clamped pressure and microwave tight via anchor bolts.
- the object is to provide a technically simple device for heating liquids / fluids by means of a microwave, in the applicator of which microwave energy can be coupled in without reflection or to a tolerable degree with little reflection.
- the object is achieved by a microwave-technical water heater for the guided heating of fluid media according to the features of claim 1.
- the microwave source of the device has a decoupling device / antenna which, depending on the spatial requirements, is flanged directly or via a rectangular waveguide to the microwave coupling opening in the side wall of a rectangular applicator.
- the load is a dielectric tube through which the medium to be heated flows, which is installed parallel to the axis of the coupling opening for the microwave between two mutually parallel side walls of the applicator and abuts on the longitudinal axis of the respective side wall.
- a metallic pipe socket connects to the dielectric tube at its two ends, both free ends are connected to a flow circuit.
- both pipe sockets attach to the respective end of the dielectric pipe in a fluid / gas-tight manner and, on the other hand, they are at least microwave-tight, but also mechanically flanged to the respective side wall of the applicator with sufficient stability, hard soldered or welded on.
- the geometry of the microwave construction is determined by the wavelength ⁇ of the microwave coupled out from the source and the formation of the linearly polarized basic mode TEio.
- the applicator is thus fixed in its geometry as a rectangular waveguide.
- the axis of the microwave coupling opening and the longitudinal axis of the dielectric tube are parallel to one another, both axes are perpendicular to two opposing applicator walls and pass through their respective longitudinal center lines. Both are at a distance of approximately ⁇ / 4 from the nearest face of the applicator.
- the distance between the antenna and the dielectric tube is so large that the microwave coupled into the applicator in the fluid flowing through the dielectric tube, the load, almost completely or completely dissipates.
- the end face near the load can therefore be adjusted in contrast to the one near the microwave coupling opening, ie it can be adjusted to the load using microwave technology and is therefore a short-circuit slide.
- This device is not necessary after appropriate, load and thus material or medium-dependent setting of the distance, if only one type of medium is to be heated.
- the dielectric tube in which the medium to be heated flows can have at most the clear distance between the two opposing applicator jacket walls between which the tube passes.
- the dielectric tube runs centrally between the two applicator jacket walls and perpendicular to the other two with which it bumps.
- the liquid flowing through is heated volumetrically, generally not uniformly over the clear cross-section of the dielectric tube, but essentially in profile, for example a sinusoidal shape, of the linearly polarized basic mode TE ⁇ 0 , which is provided for the relevant powerful heating.
- the clear width of the two pipe sockets from the respective applicator wall is initially equal to the outside diameter of the dielectric pipe.
- this partial length l g moves in the range ⁇ / 4 ⁇ lg ⁇ / 2.
- the two pipe sockets are tapered over their length l cu t-off> ⁇ / 4 in such a way that cut-off conditions for the microwave are there for the microwave, depending on the relative dielectric constant ⁇ r of the medium to be heated exist, so it cannot escape into the environment.
- the fine-tuning option is listed with the end wall of the applicator close to the load.
- This technical device is a short-circuit slide and is only necessary for electrically different media. With one and The same medium to be heated, this forehead as the opposite one can be built in from the start, or is built in.
- microwave source which type of microwave source is used in an individual case depends on the power requirement and the frequency v or wavelength ⁇ of the microwave.
- the magnetron which is technically fully developed today, should be unrivaled in power ranges ⁇ 10 kW (claim 4).
- microwave sources are a klystron or a backward wave oscillator, BWO, or another microwave tube that is technically suitable for the necessary microwave power.
- the rectangular semiconductor and applicator have a simple geometry based on the operating frequency. Basically, any frequency could be used as long as the correspondingly powerful microwave sources are available.
- the microwave-powered instantaneous water heater can be used to heat polar and non-polar fluids / liquids in a controlled manner.
- Polar fluids are understood to be liquids whose molecules have a permanent electrical dipole moment, such as water,
- Acids, oleic acids and the like As is known, this allows electrical fields to be coupled well.
- the complementary group of non-polar consists of molecules that do not have this electrical dipole moment permanently, so they are mostly organic in nature, such as acid-free oils and fats, alcohols, to name just a few. Volumetric heating is decisive for both types.
- the microwave water heater is a technically very simple structure that consists entirely of standard components. Microwave shielding measures to the environment exist to a certain extent inherently, as the microwave source as Assembly is surrounded with a metal housing. It is equipped with cooling fins and a blower for cooling, or cooling fins with channels through which coolant can flow, which can be connected to a cooling circuit.
- the applicator is flanged on directly or via a short waveguide section. The flow circuit is easily closed with two hose connections via the two metal pipe sockets, which attach to the two ends of the dielectric pipe.
- the microwave technology device is decoupled from the use of the heated fluid, which means that only the microwave technology device needs to be safely shielded from the environment, but not the usage device, such as a heating bath, a radiator, a temperature control device or any other heating device that can be used in this way in process plants in which the heated fluid is finally used.
- the usage device such as a heating bath, a radiator, a temperature control device or any other heating device that can be used in this way in process plants in which the heated fluid is finally used.
- a gas can also be heated in this way, provided the microwave can be used in the light area of the dielectric tube at all, i.e. would competitively couple with other heating systems.
- the electromagnetic source in the form of the antenna or coupling opening and the sink receiving without reflection, in the form of the entire load consisting of a dielectric tube and the fluid flowing through it, with technical design ensuring that the coupled electromagnetic energy completely, or at least mainly dissipated into the flowing fluid.
- the power of the device can be regulated continuously from zero to nominal power.
- FIG. 1 the applicator
- Figure 2 shows the intensity distribution in the loaded applicator when tuning
- Figure 3 shows the intensity distribution in the empty applicator.
- the geometry is based on this.
- Two further usable ISM frequencies are the lower of 915 MHz and the higher of 5.85 GHz, for example.
- Technically usable microwave sources are still available as standard.
- a magnetron is used as the microwave source. It has, for example, the following technical data: microwave power 1000 W, frequency 2.45 GHz,
- the magnetron With its cooling device, the magnetron usually forms a structural unit ex works.
- the rectangular waveguide is open at its head and provided with a coupling flange there.
- the applicator 1 flanges onto it, and an evacuation connection piece attaches to the forehead lying near the coupling opening for possibly necessary empty pumping.
- the other forehead 8 of the appliqué tors 1 is either fixed or is designed as a short-circuit slide 8.
- Figure 1 does not show this situation to this extent. Only the parallelepiped applicator 1 is shown, which here is made of aluminum, for example. In its upper cover wall 3 is the opening 5 for the microwave coupling. Further along the longitudinal axis in the figure to the left, the dielectric tube 2 is installed between the top 3 and bottom wall 4 of the applicator 1, here a ceramic tube made of Al 2 O 3 . Outwardly, the metal-shielded drain 6 and on the other side 4 the metal-shielded inflow 7 attach to it on one side 3. This is followed by the transition to hose 10 or 9 of the circuit.
- the source ie the coupling of the microwave energy with an initially high energy density relative to the further interior of the applicator 1 is near the front wall on the right, ⁇ / 4 distance * 3 cm.
- the entire electromagnetic energy sinks ie it is volumetrically dissipated in the flowing load into thermal energy. In this situation there is no reflection / resonance in the applicator, the microwave is completely absorbed in the load.
- FIG. 3 shows the no-load case, which is represented by the reflection / resonance in the applicator.
- This resonance case should be avoided since without a circulator between the microwave source, here the magnetron, and the coupling opening 5 in the applicator 1, the same would be endangered by backward coupling from the applicator 1.
- the backward coupling into a microwave lenario avoided by adaptation or at least suppressed to a tolerable level by protective measures such as the circulator.
- the assembly of the microwave used as standard, i.e. the microwave source as such, with its cooling device in the form of a blower or in the form of a cooling coil group, coupling to a heat-dissipating point, the power supply with control and switching device is not indicated, since it is necessary for the explanation of the invention Coupling opening 5 on the applicator 1 is sufficient.
- the coupling-out opening of the microwave source couples there directly or indirectly via a waveguide piece.
- technically customary measures for monitoring, protection and control purposes are also not indicated in FIG. 1 for the sake of clarity and emphasis.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10128038A DE10128038C1 (en) | 2001-06-08 | 2001-06-08 | Microwave through-flow heater, for domestic, medical or industrial applications, has dimensions of microwave applicator matched to wavelength of microwaves |
DE10128038 | 2001-06-08 | ||
PCT/EP2002/005335 WO2002102116A1 (en) | 2001-06-08 | 2002-05-15 | Microwave continuous water heater |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1393595A1 true EP1393595A1 (en) | 2004-03-03 |
Family
ID=7687754
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02778874A Withdrawn EP1393595A1 (en) | 2001-06-08 | 2002-05-15 | Microwave continuous water heater |
Country Status (5)
Country | Link |
---|---|
US (1) | US6917022B2 (en) |
EP (1) | EP1393595A1 (en) |
JP (1) | JP2004529480A (en) |
DE (1) | DE10128038C1 (en) |
WO (1) | WO2002102116A1 (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050093209A1 (en) * | 2003-10-31 | 2005-05-05 | Richard Bergman | Microwave stiffening system for ceramic extrudates |
US20080310995A1 (en) * | 2003-12-12 | 2008-12-18 | Charm Stanley E | Method, Device and System for Thermal Processing |
US20090134152A1 (en) * | 2005-10-27 | 2009-05-28 | Sedlmayr Steven R | Microwave nucleon-electron-bonding spin alignment and alteration of materials |
US7518092B2 (en) * | 2007-03-15 | 2009-04-14 | Capital Technologies, Inc. | Processing apparatus with an electromagnetic launch |
US8674275B2 (en) | 2007-06-29 | 2014-03-18 | Corning Incorporated | Method of fabricating a honeycomb structure using microwaves |
GB2457495A (en) * | 2008-02-15 | 2009-08-19 | E2V Tech | RF electromagnetic heating a dielectric fluid |
CA2762654C (en) * | 2008-09-23 | 2017-11-14 | Aseptia, Inc. | Electromagnetic system |
JP5300014B2 (en) * | 2009-03-10 | 2013-09-25 | 独立行政法人産業技術総合研究所 | Method and apparatus for continuous microwave irradiation to fluid |
GB2468901A (en) * | 2009-03-26 | 2010-09-29 | E2V Tech | Microwave Oven |
WO2013156875A2 (en) * | 2012-03-27 | 2013-10-24 | Goji Ltd. | A phase array in-line heater |
US9579625B2 (en) | 2012-09-21 | 2017-02-28 | Total Synthesis Ltd. | Fluid processing apparatus |
DE102013112141B4 (en) * | 2013-11-05 | 2017-03-23 | Howe Wurstwaren Kg | Apparatus for treating a sausage strand |
CA2946550A1 (en) * | 2014-04-21 | 2015-10-29 | Johnson Industries International, Inc. | Use of electromagnetic energy for making pasta filata cheese |
GB201908940D0 (en) | 2019-06-21 | 2019-08-07 | C Tech Innovation Ltd | Electromagnetic heating reactor |
RU2732722C1 (en) * | 2020-02-19 | 2020-09-22 | Государственное бюджетное образовательное учреждение высшего образования Нижегородский государственный инженерно-экономический университет (НГИЭУ) | Microwave unit with nonconventional resonators for defrosting of cow colostrum heating in continuous mode |
CN115278971B (en) * | 2022-09-07 | 2023-03-31 | 四川大学 | Microwave heating assembly and microwave heating device |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990015515A1 (en) * | 1989-06-07 | 1990-12-13 | Wolfgang Moshammer | Process and device for irradiating material containing or mixed with water with microwave energy |
US5235251A (en) * | 1991-08-09 | 1993-08-10 | The United States Of America As Represented By The Secretary Of The Air Force | Hydraulic fluid cooling of high power microwave plasma tubes |
US5625259A (en) * | 1995-02-16 | 1997-04-29 | Applied Science And Technology, Inc. | Microwave plasma applicator with a helical fluid cooling channel surrounding a microwave transparent discharge tube |
AUPN559595A0 (en) * | 1995-09-22 | 1995-10-19 | Kodak (Australiasia) Proprietary Ltd. | Microwave heating apparatus |
DE19606517C2 (en) * | 1996-02-22 | 1998-07-02 | Koettnitz Andreas Dipl Wirtsch | Pressure reactor with microwave heating for continuous operation |
ZA976292B (en) * | 1996-07-29 | 1998-02-03 | Aeci Ltd | Process for decomposing a polymer to its monomer or monomers. |
DE19925493C1 (en) * | 1999-06-04 | 2001-01-18 | Fraunhofer Ges Forschung | Linearly extended arrangement for large-area microwave treatment and for large-area plasma generation |
ATE381876T1 (en) * | 2001-06-01 | 2008-01-15 | Comm And Power Ind Inc | MICROWAVE APPLICATOR FOR HEATING A FLOWING LIQUID |
-
2001
- 2001-06-08 DE DE10128038A patent/DE10128038C1/en not_active Expired - Fee Related
-
2002
- 2002-05-15 JP JP2003504714A patent/JP2004529480A/en active Pending
- 2002-05-15 EP EP02778874A patent/EP1393595A1/en not_active Withdrawn
- 2002-05-15 WO PCT/EP2002/005335 patent/WO2002102116A1/en not_active Application Discontinuation
-
2003
- 2003-12-08 US US10/730,559 patent/US6917022B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO02102116A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2004529480A (en) | 2004-09-24 |
US20040155034A1 (en) | 2004-08-12 |
WO2002102116A1 (en) | 2002-12-19 |
DE10128038C1 (en) | 2002-11-21 |
US6917022B2 (en) | 2005-07-12 |
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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 |
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17P | Request for examination filed |
Effective date: 20031204 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
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AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: LINK, GUIDO Inventor name: BAUMGAERTNER, HARTMUT Inventor name: FEHER, LAMBERT, DR. |
|
17Q | First examination report despatched |
Effective date: 20040305 |
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GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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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 |
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18D | Application deemed to be withdrawn |
Effective date: 20051116 |