US20060236957A1 - Superheated steam producing device - Google Patents
Superheated steam producing device Download PDFInfo
- Publication number
- US20060236957A1 US20060236957A1 US10/543,788 US54378804A US2006236957A1 US 20060236957 A1 US20060236957 A1 US 20060236957A1 US 54378804 A US54378804 A US 54378804A US 2006236957 A1 US2006236957 A1 US 2006236957A1
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- Prior art keywords
- cylindrical housing
- overheated steam
- heat
- water
- steam generator
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- 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.)
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Classifications
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- 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
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
- H05B6/108—Induction heating apparatus, other than furnaces, for specific applications using a susceptor for heating a fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/10—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving electrical means
- B24B49/105—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving electrical means using eddy currents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
- F22B1/281—Methods of steam generation characterised by form of heating method in boilers heated electrically other than by electrical resistances or electrodes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
- F22B1/287—Methods of steam generation characterised by form of heating method in boilers heated electrically with water in sprays or in films
Definitions
- the present invention relates generally to a technology for generation of overheated steam, and more particularly to the provision of a technology for facilitated generation of large amounts of overheated steam.
- JP(A)8-135903 One known technology for generation of overheated steam, for instance, is set forth in JP(A)8-135903. While an AC current conducts through a coil to generate heat from a metal body by virtue of electromagnetic induction, water vapor is in contact with the surface of that heat-generation body, passing around it, thereby generating water vapor of 100° C. or higher (overheated water vapor). With other known technology as shown typically in JP(A)9-241734, water is evaporated in a steam boiler and the resulting water vapor is heated to high temperatures by combustion of fuel.
- the primary object of the invention is to provide a solution to the aforesaid problems of the prior art.
- the invention is embodied in the form of the overheated steam generator and the process of generating high-pressure overheated steam as given below.
- An overheated steam generator characterized by comprising a cylindrical housing of a heat-resistant material having a water injection inlet port at one end and an overheated steam injection outlet port at an opposite end, an exciting coil wound around an outer periphery of said cylindrical housing, and an air-permeable assembly to be heated, which is housed in said cylindrical housing and formed of an electrically conductive material.
- An overheated steam generator characterized by comprising a cylindrical housing of a heat-resistant material having a water injection inlet port and a water vapor inlet port at one end and an overheated steam injection outlet port at an opposite end, an exciting coil wound around an outer periphery of said cylindrical housing, and an air-permeable assembly to be heated, which is housed in said cylindrical housing and formed of an electrically conductive material.
- An overheated steam generator characterized by comprising a cylindrical housing of a heat-resistant material, in which water is injected through one end and out of which overheated steam is injected through an opposite end, and electromagnetic induction heating means including an air-permeable heat-generation unit of an electrically conductive material which generates heat by electromagnetic induction for heating water charged in said cylindrical housing.
- An overheated steam generator characterized by comprising a cylindrical housing of a heat-resistant material having a water injection inlet port at one end and an overheated steam injection outlet port at an opposite end, a refractory that is applied over an outer periphery of said cylindrical housing and formed of a heat-resistant material, an exciting coil wound around an outer periphery of said refractory, and an air-permeable assembly to be heated, which is housed in said cylindrical housing and formed of an electrically conductive material.
- overheated steam generator according to any one of (1) to (9) above, characterized in that overheated steam injected out of the outlet port at the opposite end of the cylindrical housing of a heat-resistant material has a temperature of 120 to 800° C.
- thermoelectric generator according to any one of (1) to (10) above, characterized in that the heat-generation unit of an electrically conductive material housed in the cylindrical housing comprises elements formed of one or more materials selected from the group consisting of a rod material, a wire material, sheet material, a honeycomb material, a network material, a spherical material, a hollow spherical material and an amorphous bulk material.
- An overheated steam generation process characterized by injecting water in a cylindrical housing of a heat-resistant material from one end, wherein said cylindrical housing houses therein an air-permeable assembly that is formed of an electrically conductive material and is to be heated, and then heating said air-permeable assembly housed in said cylindrical housing by means of high-frequency induction, thereby injecting high-temperature overheated steam out of an opposite end of the cylindrical housing.
- An overheated steam generation process characterized by injecting water and water vapor in a cylindrical housing of a heat-resistant material from one end, wherein said cylindrical housing houses therein an air-permeable assembly that is formed of an electrically conductive material and is to be heated, and then heating said air-permeable assembly housed in said cylindrical housing by means of high-frequency induction, thereby injecting high-temperature overheated steam out of an opposite other end of the cylindrical housing.
- FIG. 1 is illustrative in schematic of one embodiment of the overheated steam generator according to the invention.
- FIGS. 2 ( a ), 2 ( b ), 2 ( c ) and 2 ( d ) are illustrative of four shapes of an element forming a part of the air-permeable assembly to be heated, which is used in the invention.
- V 1 , V 2 on-off valves
- V 3 , V 4 check valves.
- FIG. 1 is illustrative in schematic of one embodiment of the overheated steam generator according to the invention
- FIGS. 2 ( a ), 2 ( b ), 2 ( c ) and 2 ( d ) are illustrative of four embodiments of an element forming a part of the air-permeable assembly to be heated.
- V 1 , V 2 on-off valves
- V 3 , V 4 check valves.
- one end la of the cylindrical housing 1 of an electrically conductive material is provided with the inlet nozzle 2 of injection of water and the other end 1 b with the port 3 out of which overheated steam is injected.
- the cylindrical housing 1 is provided over its outer periphery with the covering material 6 formed of a castable refractory ceramic material for the purpose of heat insulation.
- the exciting coil 5 for conduction of a high-frequency current is wound around the outer periphery of the ceramic covering material 6 , and connected with a high-frequency current power source, not shown.
- the cylindrical housing 1 receives the air-permeable assembly 4 that is formed of an electrically conductive material and is to be heated, wherein, as shown in FIG. 1 , the air-permeable assembly 4 is made up of stainless steel balls, one of which is shown in FIG. 2 ( a ).
- the assembly 4 is heated by electromagnetic induction by the exciting coil 5 to generate heat, so that water or water vapor passing through it can be heated to high temperatures into overheated steam HV that is injected out of the outlet port 3 at the other end 1 b .
- Reference numeral 40 stands for a punching metal sheet.
- the water injection inlet nozzle 2 at the one end 1 a of the cylindrical housing 1 is connected to a water feed pump P via the conduit 7 , and to the pressurized water vapor generation unit 8 as well.
- the on-off valve V 2 provided on the way of a conduit from the pressurized water vapor generation unit 8 remains closed and the on-off valve V 1 is opened.
- the on-off valve V 1 is opened.
- V 3 and V 4 are the check valves.
- water, or water and water vapor are injected into the cylindrical housing 1 from its one end 1 a , in which the air-permeable assembly 4 to be heated, formed of an electrically conductive material, is housed. Then, water or water vapor makes its way through the air-permeable assembly 4 to be heated, housed in the cylindrical housing 1 . In the meantime, the air-permeable assembly 4 is heated with heat generated by electromagnetic induction by the exiting coil 5 , so that the water or water vapor passing through it is heated to high temperature into overheated steam HV that is injected out of the outlet port 3 at the other end 1 b of the cylindrical housing 1 .
- reference numeral 40 is the punching metal sheet that is provided for prevention of the elements in the air-permeable assembly 4 housed in the cylindrical housing 1 from coming out.
- Reference numeral 41 is the keeper formed of a punching metal sheet that has preferably high thermal conductivity and good heat resistance (e.g., a copper or silver sheet).
- the keeper 41 formed of copper has a vertically double-sheet structure, in which sheets 41 a and 41 b are joined together via a bridging sheet 41 c .
- the sheet 41 b has a long leg 41 d that extends between the elements of the air-permeable assembly 4 .
- the high heat of the air-permeable assembly 4 always conducts to the long leg 41 d to maintain 41 b , 41 c and 41 a at so high temperature that the water injected from the inlet nozzle 2 can be immediately and continuously vaporized without undergoing temperature drops.
- the air-permeable assembly 4 to be heated housed in the cylindrical housing 1 , is heated by high-frequency induction with water injected into it, it allows overheated water vapor to be generated in an amount of about a few tens to thousand times as much as that generated by introduction of water vapor into the cylindrical housing. Accordingly, high-pressure overheated water vapor can be easily injected out of the other end of the cylindrical housing.
- 22.4-liter water vapor is 18 grams, but 18-ml water is 18 grams.
- 22-ml water is 18 grams.
- pressurized water vapor is obtained in an amount of about 1,200 times as much as that obtained by the introduction and heating of water vapor.
- the resulting pressurized water vapor is brought up to a very high pressure.
- electrically conductive material of the air-permeable assembly 4 use could be made of metals of strong magnetism such as iron and metals of weak magnetism such as stainless steels SUS430 and SUS403, nickel and titanium as well as carbon ceramics such as carbon and silicon carbide.
- the magnetic metal material, especially the soft magnetic material is preferable for the electrically conductive material of the air-permeable assembly 4 to be heated.
- a requirement for the air-permeable assembly 4 to be heated is that vapors pass smoothly through it in a tank, and it could be made up of a rod material, a wire material, a sheet material, a honeycomb material, a network material, a spherical material, a hollow spherical material, an amorphous bulk material or the like. These materials could be provided with through-holes.
- Overheated water vapor was generated, using the overheated steam generator of FIG. 1 , in which the air-permeable assembly 4 to be heated was comprised of hollow sphere elements, each having some openings as shown in FIG. 2 ( b ).
- water was injected into the cylindrical housing 1 from the inlet nozzle 2 located at its one end la at an injection pressure of 4 to 6 kg/cm 2 and in an amount of 6 to 10 kg/h.
- the pressurized water vapor generation unit 8 was not used; the on-off valve V 2 remained closed and the on-off valve V 1 was set at an open position.
- the cylindrical housing 1 had an inside diameter of 20 cm and a length of 40 cm.
- the assembly to be heated was comprised of elements made of a ferritic stainless steel (SUS430) that was a magnetic metal material (carbon steel in a preferable embodiment), and the cylindrical housing 1 was made of an austenitic stainless steel (SUS304).
- a high-frequency current having a frequency of 20 kHz was fed to the exciting coil 5 at 25 to 30 kw/h.
- water or water and water vapor are injected into a cylindrical housing from its one end, wherein the cylindrical housing receives an air-permeable assembly of an electrically conductive material to be heated, and the air-permeable assembly received in the cylindrical housing is heated by high-frequency induction, so that overheated water vapor in an amount of about a few tens to thousand times as much as that obtained by heating water vapor introduced in the cylindrical housing and, hence, at a high pressure, can be easily injected out of the other end.
- the high-temperature overheated water vapor obtained in the invention could be utilized for disinfection of cereals such as wheat, buckwheat and beans and fruits and vegetables such as strawberry and tomato or roasting of tee leaves and coffee beans, purification of contaminated soils by gasification and isolation of volatile harmful substances (e.g., organic chlorine base harmful products) from them, or the like.
- cereals such as wheat, buckwheat and beans and fruits and vegetables
- fruits and vegetables such as strawberry and tomato or roasting of tee leaves and coffee beans
- purification of contaminated soils by gasification and isolation of volatile harmful substances (e.g., organic chlorine base harmful products) from them, or the like.
Abstract
The invention provides a process and apparatus for facilitated generation of large amounts of high-temperature overheated water vapor from water.
The overheated steam generator comprises a cylindrical housing 1 of a heat-resistant material having a water injection inlet port 1 a at one end and an overheated steam injection outlet port 4 at an opposite end, an exciting coil 6 wound around the outer periphery of the cylindrical housing 1, and an air-permeable assembly 4 to be heated, which is housed in the cylindrical housing 1 and formed of an electrically conductive material.
Water is injected into the cylindrical housing 1 from one end 1 a. The cylindrical housing 1 receives the air-permeable assembly 4 that is to be heated and is formed of an electrically conductive material. Then, the air-permeable assembly 4 housed in the cylindrical housing 1 is heated by high-frequency induction to inject large amounts of high-temperature overheated water vapor out of the outlet port 3 at the opposite end 1 b of the cylindrical housing 1.
Description
- The present invention relates generally to a technology for generation of overheated steam, and more particularly to the provision of a technology for facilitated generation of large amounts of overheated steam.
- Overheated steam, because of being a high-temperature water vapor free of any harmful components, lends itself well to disinfection, sterilization or the like of foodstuffs.
- One known technology for generation of overheated steam, for instance, is set forth in JP(A)8-135903. While an AC current conducts through a coil to generate heat from a metal body by virtue of electromagnetic induction, water vapor is in contact with the surface of that heat-generation body, passing around it, thereby generating water vapor of 100° C. or higher (overheated water vapor). With other known technology as shown typically in JP(A)9-241734, water is evaporated in a steam boiler and the resulting water vapor is heated to high temperatures by combustion of fuel.
- With the prior art electromagnetic induction heating technologies, however, it is not easy to generate large amounts of high-temperature overheated steam, and it is difficult to generate high-pressure overheated steam, either.
- The primary object of the invention is to provide a solution to the aforesaid problems of the prior art. The invention is embodied in the form of the overheated steam generator and the process of generating high-pressure overheated steam as given below.
- (1) An overheated steam generator, characterized by comprising a cylindrical housing of a heat-resistant material having a water injection inlet port at one end and an overheated steam injection outlet port at an opposite end, an exciting coil wound around an outer periphery of said cylindrical housing, and an air-permeable assembly to be heated, which is housed in said cylindrical housing and formed of an electrically conductive material.
- (2) An overheated steam generator, characterized by comprising a cylindrical housing of a heat-resistant material having a water injection inlet port and a water vapor inlet port at one end and an overheated steam injection outlet port at an opposite end, an exciting coil wound around an outer periphery of said cylindrical housing, and an air-permeable assembly to be heated, which is housed in said cylindrical housing and formed of an electrically conductive material.
- (3) An overheated steam generator, characterized by comprising a cylindrical housing of a heat-resistant material, in which water is injected through one end and out of which overheated steam is injected through an opposite end, and electromagnetic induction heating means including an air-permeable heat-generation unit of an electrically conductive material which generates heat by electromagnetic induction for heating water charged in said cylindrical housing.
- (4) An overheated steam generator, characterized by comprising a cylindrical housing of a heat-resistant material having a water injection inlet port at one end and an overheated steam injection outlet port at an opposite end, a refractory that is applied over an outer periphery of said cylindrical housing and formed of a heat-resistant material, an exciting coil wound around an outer periphery of said refractory, and an air-permeable assembly to be heated, which is housed in said cylindrical housing and formed of an electrically conductive material.
- (5) The overheated steam generator according to any one of (1) to (4) above, characterized in that the heat-resistant material is a ceramic material.
- (6) The overheated steam generator according to any one of (1) to (5) above, characterized in that the one end of the cylindrical housing is additionally provided with an injection inlet port for introduction of a liquid other than water.
- (7) The overheated steam generator according to any one of (1) to (5) above, characterized in that the one end of the cylindrical housing is additionally provided with an injection inlet port for introduction of fluid comprising water and other liquid.
- (8) The overheated steam generator according to any one of (2) to (7) above, characterized in that the one end of the cylindrical housing is additionally provided with an inlet port for introduction of water vapor and other gas.
- (9) The overheated steam generator according to any one of (6) to (8) above, characterized in that the liquid other than water or the gas contains an organic chlorine compound.
- (10) The overheated steam generator according to any one of (1) to (9) above, characterized in that overheated steam injected out of the outlet port at the opposite end of the cylindrical housing of a heat-resistant material has a temperature of 120 to 800° C.
- (11) The overheated steam generator according to any one of (1) to (10) above, characterized in that the heat-generation unit of an electrically conductive material housed in the cylindrical housing comprises elements formed of one or more materials selected from the group consisting of a rod material, a wire material, sheet material, a honeycomb material, a network material, a spherical material, a hollow spherical material and an amorphous bulk material.
- (12) The overheated steam generator according to any one of (1) to (11) above, characterized in that the heat-generation unit of an electrically conductive material housed in the cylindrical housing is formed of a magnetic material.
- (13) The overheated steam generator according to any one of (1) to (12) above, characterized in that the cylindrical housing of a heat-resistant material is formed of a non-magnetic material.
- (14) An overheated steam generation process, characterized by injecting water in a cylindrical housing of a heat-resistant material from one end, wherein said cylindrical housing houses therein an air-permeable assembly that is formed of an electrically conductive material and is to be heated, and then heating said air-permeable assembly housed in said cylindrical housing by means of high-frequency induction, thereby injecting high-temperature overheated steam out of an opposite end of the cylindrical housing.
- (15) An overheated steam generation process, characterized by injecting water and water vapor in a cylindrical housing of a heat-resistant material from one end, wherein said cylindrical housing houses therein an air-permeable assembly that is formed of an electrically conductive material and is to be heated, and then heating said air-permeable assembly housed in said cylindrical housing by means of high-frequency induction, thereby injecting high-temperature overheated steam out of an opposite other end of the cylindrical housing.
- (16) The overheated steam generation process according to (14) or (15) above, characterized in that the cylindrical housing of a heat-resistant material is formed of a non-magnetic material.
-
FIG. 1 is illustrative in schematic of one embodiment of the overheated steam generator according to the invention, and - FIGS. 2(a), 2(b), 2(c) and 2(d) are illustrative of four shapes of an element forming a part of the air-permeable assembly to be heated, which is used in the invention.
- 1: cylindrical housing,
- 1 a: one end of the cylindrical housing 1,
- 1 b: the opposite or other end of the cylindrical housing 1,
- 2: inlet nozzle for injection of water,
- 3: outlet port out of which overheated steam is injected,
- 4: element that forms a part of air-permeable assembly to be heated,
- 5: exciting coil,
- 6: covering material,
- 7: conduit,
- 8: pressurized water vapor generation unit,
- 40: punching metal sheet,
- 41: keeper formed of a punching metal sheet,
- HV: overheated steam,
- V1, V2: on-off valves, and
- V3, V4: check valves.
- The invention is now explained more specifically with reference to the accompanying drawings.
-
FIG. 1 is illustrative in schematic of one embodiment of the overheated steam generator according to the invention, and FIGS. 2(a), 2(b), 2(c) and 2(d) are illustrative of four embodiments of an element forming a part of the air-permeable assembly to be heated. - As mentioned above, the reference numerals are:
- 1: cylindrical housing,
- 1 a: one end of the cylindrical housing 1,
- 1 b: the opposite or other end of the cylindrical housing 1,
- 2: inlet nozzle for injection of water,
- 3: outlet port out of which overheated steam is injected,
- 4: element that forms a part of the air-permeable assembly to be heated,
- 5: exciting coil,
- 6: covering material,
- 7: conduit,
- 8: pressurized water vapor generation unit,
- 40: punching metal sheet,
- 41: keeper formed of a punching metal sheet,
- HV: overheated steam,
- V1, V2: on-off valves, and
- V3, V4: check valves.
- Referring first to
FIG. 1 , one end la of the cylindrical housing 1 of an electrically conductive material is provided with theinlet nozzle 2 of injection of water and theother end 1 b with theport 3 out of which overheated steam is injected. - The cylindrical housing 1 is provided over its outer periphery with the covering
material 6 formed of a castable refractory ceramic material for the purpose of heat insulation. Theexciting coil 5 for conduction of a high-frequency current is wound around the outer periphery of theceramic covering material 6, and connected with a high-frequency current power source, not shown. - The cylindrical housing 1 receives the air-
permeable assembly 4 that is formed of an electrically conductive material and is to be heated, wherein, as shown inFIG. 1 , the air-permeable assembly 4 is made up of stainless steel balls, one of which is shown inFIG. 2 (a). Theassembly 4 is heated by electromagnetic induction by theexciting coil 5 to generate heat, so that water or water vapor passing through it can be heated to high temperatures into overheated steam HV that is injected out of theoutlet port 3 at theother end 1 b.Reference numeral 40 stands for a punching metal sheet. - It is noted that the water
injection inlet nozzle 2 at the oneend 1 a of the cylindrical housing 1 is connected to a water feed pump P via theconduit 7, and to the pressurized watervapor generation unit 8 as well. - To inject water from the
inlet nozzle 2 into the cylindrical. housing 1, the on-off valve V2 provided on the way of a conduit from the pressurized watervapor generation unit 8 remains closed and the on-off valve V1 is opened. To inject water and pressurized water vapor into the cylindrical housing 1, not only the on-off valve V2 but also the on-off valve V1 is opened. It is noted that V3 and V4 are the check valves. - In the embodiment of the invention, water, or water and water vapor are injected into the cylindrical housing 1 from its one
end 1 a, in which the air-permeable assembly 4 to be heated, formed of an electrically conductive material, is housed. Then, water or water vapor makes its way through the air-permeable assembly 4 to be heated, housed in the cylindrical housing 1. In the meantime, the air-permeable assembly 4 is heated with heat generated by electromagnetic induction by the exitingcoil 5, so that the water or water vapor passing through it is heated to high temperature into overheated steam HV that is injected out of theoutlet port 3 at theother end 1 b of the cylindrical housing 1. - It is noted that
reference numeral 40 is the punching metal sheet that is provided for prevention of the elements in the air-permeable assembly 4 housed in the cylindrical housing 1 from coming out. Reference numeral 41 is the keeper formed of a punching metal sheet that has preferably high thermal conductivity and good heat resistance (e.g., a copper or silver sheet). In the embodiment shown, the keeper 41 formed of copper has a vertically double-sheet structure, in whichsheets bridging sheet 41 c. Thesheet 41 b has along leg 41 d that extends between the elements of the air-permeable assembly 4. - Accordingly, the high heat of the air-
permeable assembly 4 always conducts to thelong leg 41 d to maintain 41 b, 41 c and 41 a at so high temperature that the water injected from theinlet nozzle 2 can be immediately and continuously vaporized without undergoing temperature drops. - As the air-
permeable assembly 4 to be heated, housed in the cylindrical housing 1, is heated by high-frequency induction with water injected into it, it allows overheated water vapor to be generated in an amount of about a few tens to thousand times as much as that generated by introduction of water vapor into the cylindrical housing. Accordingly, high-pressure overheated water vapor can be easily injected out of the other end of the cylindrical housing. - In other words, 22.4-liter water vapor is 18 grams, but 18-ml water is 18 grams. Theoretically, if 18-ml water is injected in the cylindrical housing 1, 22,400-ml water vapor will occur with the result that 22,400 ml÷18 ml≈1,240. To put it another way, as water is injected and heated, pressurized water vapor is obtained in an amount of about 1,200 times as much as that obtained by the introduction and heating of water vapor. Thus, the resulting pressurized water vapor, too, is brought up to a very high pressure.
- It is noted that while water or water vapor passes through the cylindrical housing 1, it comes in contact with the heated air-permeable assembly, where it is further heated into overheated steam, which makes its way toward the discharge side of the cylindrical housing 1 while it expands slowly.
- Even with the power source for the
exciting coil 5 put off as the internal temperature of the cylindrical housing 1 rises, much time is taken for cooling, because the air-permeable assembly 4, kept in a high-temperature state, cools off, ending up with a decrease in the internal temperature of the cylindrical housing 1. - For the electrically conductive material of the air-
permeable assembly 4, use could be made of metals of strong magnetism such as iron and metals of weak magnetism such as stainless steels SUS430 and SUS403, nickel and titanium as well as carbon ceramics such as carbon and silicon carbide. - The magnetic metal material, especially the soft magnetic material is preferable for the electrically conductive material of the air-
permeable assembly 4 to be heated. - A requirement for the air-
permeable assembly 4 to be heated is that vapors pass smoothly through it in a tank, and it could be made up of a rod material, a wire material, a sheet material, a honeycomb material, a network material, a spherical material, a hollow spherical material, an amorphous bulk material or the like. These materials could be provided with through-holes. - Overheated water vapor was generated, using the overheated steam generator of
FIG. 1 , in which the air-permeable assembly 4 to be heated was comprised of hollow sphere elements, each having some openings as shown in FIG. 2(b). - First, water was injected into the cylindrical housing 1 from the
inlet nozzle 2 located at its one end la at an injection pressure of 4 to 6 kg/cm2 and in an amount of 6 to 10 kg/h. However, the pressurized watervapor generation unit 8 was not used; the on-off valve V2 remained closed and the on-off valve V1 was set at an open position. - The cylindrical housing 1 had an inside diameter of 20 cm and a length of 40 cm. The assembly to be heated was comprised of elements made of a ferritic stainless steel (SUS430) that was a magnetic metal material (carbon steel in a preferable embodiment), and the cylindrical housing 1 was made of an austenitic stainless steel (SUS304).
- A high-frequency current having a frequency of 20 kHz was fed to the
exciting coil 5 at 25 to 30 kw/h. - As a result, overheated water vapor having a temperature of as high as 320° C. was continuously injected out of the overheated steam outlet port.
- According to the invention, water or water and water vapor are injected into a cylindrical housing from its one end, wherein the cylindrical housing receives an air-permeable assembly of an electrically conductive material to be heated, and the air-permeable assembly received in the cylindrical housing is heated by high-frequency induction, so that overheated water vapor in an amount of about a few tens to thousand times as much as that obtained by heating water vapor introduced in the cylindrical housing and, hence, at a high pressure, can be easily injected out of the other end.
- The high-temperature overheated water vapor obtained in the invention could be utilized for disinfection of cereals such as wheat, buckwheat and beans and fruits and vegetables such as strawberry and tomato or roasting of tee leaves and coffee beans, purification of contaminated soils by gasification and isolation of volatile harmful substances (e.g., organic chlorine base harmful products) from them, or the like.
Claims (16)
1. An overheated steam generator, which comprises a cylindrical housing of a heat-resistant material having a water injection inlet port at one end and an overheated steam injection outlet port at an opposite end, an exciting coil wound around an outer periphery of said cylindrical housing, and an air-permeable assembly to be heated, which is housed in said cylindrical housing and formed of an electrically conductive material.
2. An overheated steam generator, which comprises a cylindrical housing of a heat-resistant material having a water injection inlet port and a water vapor inlet port at one end and an overheated steam injection outlet port at an opposite end, an exciting coil wound around an outer periphery of said cylindrical housing, and an air-permeable assembly to be heated, which is housed in said cylindrical housing and formed of an electrically conductive material.
3. An overheated steam generator, which comprises a cylindrical housing of a heat-resistant material, in which water is injected through one end and out of which overheated steam is injected through an opposite end, and electromagnetic induction heating means including an air-permeable heat-generation unit of an electrically conductive material which generates heat by electromagnetic induction for heating water charged in said cylindrical housing.
4. An overheated steam generator, which comprises a cylindrical housing of a heat-resistant material having a water injection inlet port at one end and an overheated steam injection outlet port at an opposite end, a refractory that is applied over an outer periphery of said cylindrical housing and-formed of a heat-resistant material, an exciting coil wound around an outer periphery of said refractory, and an air-permeable assembly to be heated, which is housed in said cylindrical housing and formed of an electrically conductive material.
5. The overheated steam generator according to any one of claim 1 or 4 , wherein the heat-resistant material is a ceramic material.
6. The overheated steam generator according to any one of claims 1 to 5 , wherein the one end of the cylindrical housing is additionally provided with an injection inlet port for introduction of a liquid other than water.
7. The overheated steam generator according to any one of claims 1 to 5 , wherein the one end of the cylindrical housing is additionally provided with an injection inlet port for introduction of fluid comprising water and other liquid.
8. The overheated steam generator according to any one of claims 2 to 7 , wherein the one end of the cylindrical housing is additionally provided with an inlet port for introduction of water vapor and other gas.
9. The overheated steam generator according to any one of claims 6 to 8 , wherein the liquid other than water or the gas contains an organic chlorine compound.
10. The overheated steam generator according to any one of claims 1 to 9 , wherein overheated steam injected out of the outlet port at the other end of the cylindrical housing of a heat-resistant material has a temperature of 120 to 800° C.
11. The overheated steam generator according to any one of claims 1 to 10 , wherein the heat-generation unit of an electrically conductive material housed in the cylindrical housing comprises elements formed of one or more materials selected from the group consisting of a rod material, a wire material, sheet material, a honeycomb material, a network material, a spherical material, a hollow spherical material and an amorphous bulk material.
12. The overheated steam generator according to any one of claims 1 to 11 , wherein the heat-generation unit of an electrically conductive material housed in the cylindrical housing is formed of a magnetic material.
13. The overheated steam generator according to any one of claims 1 to 12 , wherein the cylindrical housing of a heat-resistant material is formed of a non-magnetic material.
14. An overheated steam generation process, which comprises injecting water in a cylindrical housing of a heat-resistant material from one end, wherein said cylindrical housing houses therein an air-permeable assembly that is formed of an electrically conductive material and is to be heated, and then heating said air-permeable assembly housed in said cylindrical housing by means of high-frequency induction, thereby injecting high-temperature overheated steam out of an opposite end of the cylindrical housing.
15. An overheated steam generation process, which comprises injecting water and water vapor in a cylindrical housing of a heat-resistant material from one end, wherein said cylindrical housing houses therein an air-permeable assembly that is formed of an electrically conductive material and is to be heated, and then heating said air-permeable assembly housed in said cylindrical housing by means of high-frequency induction, thereby injecting high-temperature overheated steam out of an opposite end of the cylindrical housing.
16. The overheated steam generation process according to claim 14 or 15 , wherein the cylindrical housing of a heat-resistant material is formed of a non-magnetic material.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-019574 | 2003-01-28 | ||
JP2003019574 | 2003-01-28 | ||
PCT/JP2004/000738 WO2004068033A1 (en) | 2003-01-28 | 2004-01-28 | Superheated steam producing device |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060236957A1 true US20060236957A1 (en) | 2006-10-26 |
Family
ID=32820611
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/543,788 Abandoned US20060236957A1 (en) | 2003-01-28 | 2004-01-28 | Superheated steam producing device |
Country Status (5)
Country | Link |
---|---|
US (1) | US20060236957A1 (en) |
EP (1) | EP1591719A4 (en) |
JP (2) | JPWO2004068033A1 (en) |
CN (1) | CN1745279A (en) |
WO (1) | WO2004068033A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160205727A1 (en) * | 2014-11-26 | 2016-07-14 | Numerical Design, Inc. | Microfluidic-based apparatus and method vaporization of liquids using magnetic induction |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
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JP4852289B2 (en) * | 2005-10-05 | 2012-01-11 | 財団法人ファインセラミックスセンター | Superheated steam generator and superheated steam utilization device |
KR100644867B1 (en) * | 2005-12-14 | 2006-11-10 | 재영솔루텍 주식회사 | Device for generating the superheated steam |
US8343422B2 (en) | 2008-08-08 | 2013-01-01 | Chokichi Sato | Water vapor plasma generating apparatus, sterilization and disinfection method, and method for antioxidative treatment using water vapor plasma |
WO2011043434A1 (en) * | 2009-10-07 | 2011-04-14 | 日本碍子株式会社 | Honeycomb structure |
CN101881480A (en) * | 2010-07-16 | 2010-11-10 | 辛海云 | Pipeline electromagnetic heating furnace |
UA111606C2 (en) * | 2011-04-30 | 2016-05-25 | Харрі Дін Кассел | An electrical induction heating assembly |
CN102785302A (en) * | 2012-08-23 | 2012-11-21 | 段伟 | Superheated steam plastic recycling device |
CN102829464A (en) * | 2012-09-27 | 2012-12-19 | 段伟 | Overheat vapor generator |
FR3037618B1 (en) * | 2015-06-18 | 2017-07-07 | Snecma | ERGOL FEEDING SYSTEM OF AN IGNITER |
KR101757756B1 (en) | 2016-11-25 | 2017-07-17 | 유동연 | Electromagnetic induction heating boiler using electrode plate and transformer |
DE102017125666A1 (en) * | 2017-11-02 | 2019-05-02 | Elwema Automotive Gmbh | Apparatus and method for cleaning workpieces by means of a steam jet and steam generator therefor |
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US6734405B2 (en) * | 2002-06-12 | 2004-05-11 | Steris Inc. | Vaporizer using electrical induction to produce heat |
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JPS52109001A (en) * | 1976-03-09 | 1977-09-12 | Masahiko Kiyotani | Furnace water pipe boiler |
WO1998029685A1 (en) * | 1996-12-26 | 1998-07-09 | Kabushiki Kaisha Seta Giken | Superheated steam generator |
JP3684758B2 (en) * | 1997-06-06 | 2005-08-17 | 松下電器産業株式会社 | Steam generator |
JP3894649B2 (en) * | 1998-02-09 | 2007-03-22 | 大旺建設株式会社 | Degradation treatment method for persistent substances |
JP4236369B2 (en) * | 2000-07-04 | 2009-03-11 | 株式会社かんでんエンジニアリング | Superheated steam generator, heating device using the device, carbonization carbonization device, superheated steam injection device, and cooker |
-
2004
- 2004-01-28 JP JP2005504721A patent/JPWO2004068033A1/en active Pending
- 2004-01-28 CN CN200480002988.XA patent/CN1745279A/en active Pending
- 2004-01-28 WO PCT/JP2004/000738 patent/WO2004068033A1/en not_active Application Discontinuation
- 2004-01-28 US US10/543,788 patent/US20060236957A1/en not_active Abandoned
- 2004-01-28 EP EP04705930A patent/EP1591719A4/en not_active Withdrawn
- 2004-01-29 JP JP2004022189A patent/JP2004233040A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6734405B2 (en) * | 2002-06-12 | 2004-05-11 | Steris Inc. | Vaporizer using electrical induction to produce heat |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160205727A1 (en) * | 2014-11-26 | 2016-07-14 | Numerical Design, Inc. | Microfluidic-based apparatus and method vaporization of liquids using magnetic induction |
Also Published As
Publication number | Publication date |
---|---|
JPWO2004068033A1 (en) | 2006-05-18 |
CN1745279A (en) | 2006-03-08 |
WO2004068033A1 (en) | 2004-08-12 |
EP1591719A1 (en) | 2005-11-02 |
EP1591719A4 (en) | 2006-04-26 |
JP2004233040A (en) | 2004-08-19 |
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