JP3624638B2 - Liquid fuel combustion equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid fuel combustion apparatus, and more particularly to a fuel vaporization section.
[0002]
[Prior art]
Conventionally, this type of combustion apparatus has been proposed as disclosed in JP-A-8-68509. This will be described with reference to FIG.
[0003]
In the figure, reference numeral 1 denotes a vaporizing portion, and a circular burner receiving seat 2 is provided on the upper portion thereof, and a nozzle portion 3 is arranged at substantially the center of the burner receiving seat 2, and the burner receiving seat 2 and the nozzle portion 3 are arranged. Between these, an opening 4 for supplying combustion air is provided. A cylindrical vaporizing chamber 6 is formed through a communication port 5 communicating with the nozzle portion 3, and a vaporizing element 7 for promoting the vaporization of fuel is provided in the vaporizing chamber 6, on the opposite side of the nozzle portion 3. An oil supply port 8 for supplying fuel is provided at the end. A U-shaped heater 9 is disposed along the lower half of the burner receiving seat 2 on the opposite side of the vaporizing chamber 6 of the vaporizing section 1. Reference numeral 10 denotes a mixing tube, which is mounted on the upper portion of the burner receiving seat 2 together with a combustion section 12 having a large number of flame holes 11 formed therein.
[0004]
In the above configuration, when the vaporizer 1 is heated to a predetermined temperature by the heater 9, the liquid fuel is supplied by the fuel supply means 13 through the fuel filler port 8, and the fuel starts to vaporize in the high-temperature vaporization element 7. . The fuel gas vaporized in the vaporizing chamber 6 is ejected from the nozzle portion 3 into the mixing tube 10 through the communication port 5. The ejected fuel gas attracts primary air for combustion by the ejector effect and is mixed in the mixing pipe 10 to become an air-fuel mixture, which is ejected from the flame hole 11 formed in the combustion section 12 and burned. The combustion exhaust gas generated by the combustion is mixed with air to become warm air and used for heating and the like. When combustion is started, heating by the heater 9 is unnecessary to heat the vaporizing chamber through the heat receiving flange 2a formed in the burner receiving seat 2 with combustion heat, and combustion is performed while vaporizing fuel with its own combustion heat. Continue.
[0005]
Further, as described in Japanese Utility Model Laid-Open No. 6-30620, a method of heating the vaporizing section with a high frequency induction heating device has been proposed.
[0006]
Japanese Patent Application Laid-Open No. 7-48128 proposes a structure in which a metal rod is provided at the center of a hydrogen storage alloy as a heating element for high-frequency induction heating.
[0007]
[Problems to be solved by the invention]
However, the combustion apparatus having the configuration described in Japanese Patent Application Laid-Open No. 8-68509 uses a sheath heater to heat the vaporizer at the start of combustion, and the heat generated by the sheath heater is used for the vaporizer. This is an indirect heating method in which the vaporizing element 7 for vaporizing the fuel is heated through the metal part 1. Therefore, there is a problem that the time from when the heater 9 is energized until the vaporizing element 7 reaches the vaporizable temperature of the fuel becomes long. Also, brass that has good heat conduction in the vaporizing section 1 in order to accelerate the heat transfer rate from the heater 9 to the vaporizing element 7 at the start of combustion, or to efficiently recover the combustion heat as heat for vaporizing fuel at the time of combustion. Etc. are used. Therefore, there is a limit to the heating temperature of the vaporization section 1 due to the heat resistance of the material, and when liquid fuel is vaporized, especially when a modified oil that has been stored and oxidized for a long period of time or a fuel containing a high-boiling heterogeneous component is used. There was a possibility that the fuel could not be completely vaporized, a tar component was generated in the vaporizing element 7, and combustion failure occurred due to clogging. Further, since the vaporizing element 7 is heated from the outer peripheral direction, the temperature of the central portion of the vaporizing element 7 is lowered, which is a cause of promoting the phenomenon of tar generation. Further, in the vaporized fuel gas, the fuel that has become poorly vaporized moves to the nozzle unit 3 as droplets, dew condensation on the inner wall of the nozzle unit 3 and tarring may cause the nozzle unit 3 to be clogged. The clogging of the nozzle part 3 has the possibility of causing a combustion failure. Among these problems, a method for heating a vaporizer by high-frequency induction heating as means for shortening the time required for fuel to vaporize is described in Japanese Utility Model Publication No. 6-30620. Such a configuration is not disclosed. Regarding the heating method inside the heating section, Japanese Patent Application Laid-Open No. 7-48128 describes a structure in which a metal rod is provided as a heating element, which is a means for releasing hydrogen from a hydrogen storage alloy, There is no disclosure regarding fuel vaporization.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a burner for burning vaporized gas, an outer tube provided with a nozzle part at one end and a fuel supply port at the other end, and a high-frequency alternating current disposed on the outer peripheral side of the outer tube. An excitation coil connected to the generator, a porous body mounted in the outer tube, a shaft disposed at a substantially central portion of the porous body, and an excitation coil for heating the nozzle portion by a magnetic field. is there.
[0009]
According to the above invention, when the high-frequency alternating current generator is energized, an alternating current is applied to the connected exciting coil to generate a magnetic field, and the outer tube, porous body, shaft body, and nozzle portion disposed inside the exciting coil. Generates heat due to the induced current induced by the generated magnetic field, but the outer tube, porous body, shaft body and nozzle part each generate heat. The arrival time can be greatly shortened. In addition, the self-heated porous body between the outer tube and the shaft body is heated to high temperatures from both the outer (outer tube side) and inner (shaft body side) sides, so that it can be seen by an indirect heating method using a sheathed heater or the like. There is no low temperature region in the vicinity of the central part, and the temperature distribution is almost the same at high temperatures from the outside toward the central part. Therefore, although the fuel supplied from the fuel supply port diffuses and moves in the porous body, it can be vaporized at a high temperature throughout the porous body, and it is possible to use a denatured oil that has been stored and oxidized for a long period of time or a fuel containing a high boiling point component. It can be vaporized almost completely and tarring can be suppressed. In addition, since the nozzle portion generates heat due to the induced current induced by the magnetic field and becomes high temperature, fuel does not exist as droplets in the nozzle portion, and even if the fuel condenses on the inner wall of the nozzle portion almost completely. Vaporization can be achieved and tarring of the nozzle portion can be suppressed.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
A liquid fuel combustion apparatus according to claim 1 of the present invention is a burner for burning vaporized gas, an outer tube having a nozzle portion at one end and a fuel supply port at the other end, and a high frequency disposed on the outer peripheral side of the outer tube. An excitation coil connected to the alternating current generator, a porous body mounted in the outer tube, a shaft disposed at a substantially central portion of the porous body, and an excitation coil for heating the nozzle portion by a magnetic field.
[0011]
When the high-frequency alternating current generator is energized, an alternating current is applied to the connected excitation coil to generate a magnetic field, and the outer tube, porous body, shaft body, and nozzle portion disposed inside the excitation coil generate magnetic fields. The outer tube, porous body, shaft body and nozzle part generate heat by themselves, but the time required to reach the fuel vaporization temperature is significantly greater than indirect heating using a conventional sheathed heater. Can be shortened. In addition, the porous body between the outer tube and the shaft body is heated to high temperatures from both the outer and inner sides in order to self-heat, and there is no low temperature region near the center as seen in the indirect heating method using a sheathed heater. The temperature distribution is almost the same at high temperatures from the outside toward the center. Therefore, although the fuel supplied from the fuel supply port diffuses and moves in the porous body, it can be vaporized at a high temperature throughout the porous body, and even if a fuel containing altered oil or a high boiling point component that has been stored and oxidized for a long period of time is used. It can be completely vaporized and tarring can be suppressed. In addition, since the nozzle portion generates heat due to the induced current induced by the magnetic field and becomes high temperature, fuel does not exist as droplets in the nozzle portion, and even if the fuel condenses on the inner wall of the nozzle portion almost completely. Vaporization can be achieved and tarring of the nozzle portion can be suppressed.
[0012]
According to a second aspect of the present invention, there is provided a liquid fuel combustion apparatus in which an exciting coil is provided on the outer periphery of the nozzle portion.
[0013]
And the nozzle part generates heat by the exciting coil provided in the outer peripheral part of the nozzle part, and can be made high temperature.
[0014]
The liquid fuel combustion apparatus according to claim 3 of the present invention is such that an exciting coil is provided so as to surround both the outer tube and the nozzle portion.
[0015]
Since the exciting coil can be shared by the exciting coil provided so as to surround both the outer tube and the nozzle portion, the configuration can be simplified.
[0016]
According to a fourth aspect of the present invention, the liquid fuel combustion apparatus has a nozzle portion made of a magnetic material.
[0017]
Since the magnetic material has a high magnetic permeability, the nozzle portion made of the magnetic material generates more heat and can be heated to a higher temperature, so that tarring of the nozzle portion can be further suppressed.
[0018]
A liquid fuel combustion apparatus according to claim 5 of the present invention is a burner for burning vaporized gas, an outer tube having a nozzle portion at one end and a fuel supply port at the other end, and a high frequency disposed on the outer peripheral side of the outer tube. An exciting coil connected to an alternating current generator, a porous body mounted in the outer tube, a hollow shaft having a plurality of openings disposed at a substantially central portion of the porous body, the nozzle part, and the plurality And a hollow shaft body having a single opening.
[0019]
The shaft body is hollow, and the shaft body starts to generate heat due to the induction current due to the magnetic field generated by the exciting coil in the initial stage of operation. Generally, high-frequency induction heating generates heat because the skin effect is large. Only the surface of the shaft body contributes, and by reducing the heat capacity of the shaft body by reducing the heat capacity of the shaft body, the heating rate of the shaft body can be increased without impairing the heat generation effect. In addition, since the nozzle portion and the hollow shaft body having the plurality of openings are integrally configured, the nozzle portion becomes high temperature due to heat transfer from the hollow shaft body that is heated and heated to high temperature. Taring can be suppressed.
[0020]
According to a sixth aspect of the present invention, there is provided a liquid fuel combustion apparatus in which a nozzle portion and a hollow shaft having a plurality of openings are joined in a screw configuration.
[0021]
And since a nozzle part becomes high temperature by the heat transfer from the hollow shaft body which became high temperature by the screw structure, tarting of a nozzle part can be suppressed.
[0022]
According to a seventh aspect of the present invention, a liquid fuel combustion apparatus comprises a hollow shaft having a plurality of openings made of a magnetic material.
[0023]
Since the magnetic material has a high magnetic permeability, the hollow shaft body having a plurality of openings made of the magnetic material generates more heat and can be heated.
[0024]
According to an eighth aspect of the present invention, a liquid fuel combustion apparatus comprises a hollow shaft having a plurality of openings made of magnetic stainless steel.
[0025]
And since magnetic stainless steel is superior in heat resistance compared to copper alloys and the like, the temperature of the hollow shaft body having a plurality of openings can be increased. It becomes possible to vaporize the fuel, and tarring can be further suppressed.
[0026]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0027]
(Example 1)
1 is a cross-sectional view of a main part of a liquid fuel combustion apparatus according to a first embodiment of the present invention.
[0028]
In FIG. 1, reference numeral 14 denotes a vaporizing portion that vaporizes fuel, 15 denotes an outer tube that forms an outer shell of the vaporizing portion 14, 16 denotes a porous body mounted in the outer tube 15, and 17 denotes an approximate center of the porous body 16. The shaft body 18 is an insulating bobbin provided so as to cover the outer periphery of the outer tube 15, 19 is an exciting coil wound around the outer periphery of the insulating bobbin 18 and generates a magnetic field, and 20 is provided at one end of the outer tube 15 to eject fuel gas The nozzle portion 21 is an exciting coil for heating the nozzle portion 20 provided on the outer peripheral portion of the nozzle portion 20 by a magnetic field, and 22 is a fuel supply port provided at the other end of the outer tube 15. The outer tube 15, the nozzle portion 20, and the fuel supply port 22 are sealed by welding or the like after the porous body 16 and the shaft body 17 are inserted therein, except for necessary openings. Reference numeral 23 denotes an oil feed pipe through which fuel passes, 24 denotes a fuel pump that supplies fuel to the vaporizing section 14, and 25 denotes a high-frequency alternating current generating section connected to the exciting coils 19 and 21. Reference numeral 26 denotes a burner for burning the fuel gas, and is provided with a mixing portion 27 for mixing the fuel gas and air and a flame port portion 28 for forming a combustion flame.
[0029]
Next, the operation and action will be described. When the high-frequency alternating current generator 25 is energized, AC power is generated and sent to the connected excitation coils 19 and 21, and an AC magnetic field is generated around each of the excitation coils 19 and 21. Occur. When the direction of the magnetic field lines of the magnetic field changes according to the supplied AC cycle, an electric force is applied to the outer tube 15, the porous body 16, the shaft body 17, and the nozzle portion 20 to prevent the magnetic field change, and the exciting coil. A current in the opposite direction to the current flowing in the 19 and 21 is induced. This induced current flows through the outer tube 15, the porous body 16, the shaft body 17 and the nozzle portion 20, and generates heat due to its resistance. At this time, the outer tube 15, the porous body 16, the shaft body 17, and the nozzle portion 20 are each self-heated by an induced current, so that the temperature raising time is greatly shortened compared to indirect heating by a conventional sheathed heater or the like. When it is detected by the temperature detection means (not shown) that the temperature of the vaporizing section 14 has reached a predetermined temperature, the fuel pump 24 starts to operate, and the fuel in the fuel tank (not shown) is sent through the oil feed pipe 23. Then, the fuel is supplied into the vaporizer 14 from the fuel supply port 22. The fuel supplied into the vaporization section 14 is heated and vaporized while penetrating and diffusing through the pores of the heated porous body 16, and the vaporized fuel gas is ejected from the nozzle section 20 into the mixing section 27 of the burner 26. When the fuel gas is ejected into the mixing unit 27, air is sucked from the periphery by the ejector effect generated by the ejection, and the fuel gas and air are mixed in the mixing unit 27 to be premixed and sent from the flame port 28. The Combustion starts when the premixed gas delivered from the flame port 28 is ignited by an ignition means (not shown).
[0030]
According to the configuration of the present invention, the outer tube 15, the porous body 16, and the shaft body 17 disposed inside the exciting coil 19 generate heat due to the induced current induced by the generated magnetic field. Since the body 16 and the shaft body 17 each generate heat, the time required to reach the vaporizable temperature of the fuel can be greatly shortened as compared with the indirect heating by the conventional sheathed heater or the like. Further, in order to self-heat, the porous body 16 between the outer tube 15 and the shaft body 17 is heated to a high temperature from both the outer side (outer tube 15 side) and the inner side (shaft body 17 side), and indirectly by a sheathed heater or the like. There is no low temperature region in the vicinity of the center as seen in the heating method, and the temperature distribution is almost the same at high temperatures from the outside toward the center. Therefore, the temperature distribution of the cross section in the radial direction of the porous body 16 is greatly improved because there is no low temperature portion compared to the conventional heating method only from the outer peripheral direction, and the fuel can be vaporized at a high temperature almost in the entire area of the porous body 16. It has become possible. Therefore, even when a modified oil that has been stored for a long period of time and oxidized and a fuel containing a high-boiling component is used, almost the entire amount can be vaporized, and generation of a tar content can be suppressed. At the same time, the nozzle portion 20 disposed inside the exciting coil 21 generates heat due to the induced current induced by the generated magnetic field and becomes high temperature. Therefore, fuel does not exist in the nozzle portion 20 as droplets. Even if fuel condenses on the inner wall of the nozzle part 20, it can be almost completely vaporized and tarring of the nozzle part can be suppressed. And it is preferable to use a magnetic material as a material constituting the nozzle part 20, and since the magnetic material has a high magnetic permeability, the nozzle part 20 made of the magnetic material generates more heat and can be heated, so that the nozzle part 20 is tarned. It can be suppressed more.
[0031]
(Example 2)
FIG. 2 is a cross-sectional view of the vaporization section of the liquid fuel combustion apparatus according to the second embodiment of the present invention.
[0032]
The second embodiment is different from the first embodiment in that an insulating bobbin 29 is provided so as to cover the outer periphery of the nozzle portion 20 and the outer tube 15, and an exciting coil 30 that is wound around the outer periphery of the insulating bobbin 29 and generates a magnetic field is provided. And the nozzle portion 20 are provided so as to surround both.
[0033]
In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
Next, the operation and action will be described. When a high-frequency alternating current generator (not shown) is energized at the start of operation, an alternating magnetic field is generated around the connected exciting coil 30. When the direction of the magnetic field lines of the magnetic field changes in accordance with the supplied AC cycle, an electric force is applied to the outer tube 15, the porous body 16, the shaft body 17, and the nozzle portion 20 to prevent the magnetic field change, and the exciting coil. A current in the opposite direction to the current flowing in 30 is induced. This induced current flows through the outer tube 15, the porous body 16, the shaft body 17, and the nozzle portion 20, and generates heat due to its resistance. At this time, the outer tube 15, the porous body 16, the shaft body 17, and the nozzle portion 20 are each self-heated by the induced current, so that the heating time is greatly shortened compared to the indirect heating by the conventional sheathed heater or the like, and the fuel vaporization is performed. The time to reach the possible temperature can be greatly reduced. Further, there is no low temperature region near the center as seen in the indirect heating method using a sheathed heater or the like, and the temperature distribution is almost the same at high temperatures from the outside toward the center. Therefore, the temperature distribution of the cross section in the radial direction of the porous body 16 is greatly improved because there is no low temperature portion compared to the conventional heating method only from the outer peripheral direction, and the fuel can be vaporized at a high temperature almost in the entire area of the porous body 16. It has become possible. Therefore, even when a modified oil that has been stored for a long period of time and oxidized and a fuel containing a high-boiling component is used, almost the entire amount can be vaporized, and generation of a tar content can be suppressed. At the same time, the nozzle portion 20 disposed inside the exciting coil 30 generates heat due to the induced current induced by the generated magnetic field, and therefore the fuel does not exist as droplets in the nozzle portion 20. Even if the fuel is condensed on the inner wall of the nozzle part 20, it can be vaporized almost completely and tarring of the nozzle part can be suppressed. And it is preferable to use a magnetic material as a material constituting the nozzle part 20, and since the magnetic material has a high magnetic permeability, the nozzle part 20 made of the magnetic material generates more heat and can be heated, so that the nozzle part 20 is tarned. It can be suppressed more. And since both the vaporization part 14 and the nozzle part 20 can be heated and heated by the exciting coil 30, the exciting coil can be shared and the configuration can be simplified.
[0034]
(Example 3)
FIG. 3 is a cross-sectional view of the vaporization portion of the liquid fuel combustion apparatus according to Embodiment 3 of the present invention.
[0035]
The third embodiment is different from the first embodiment in that a hollow shaft body 31 having a plurality of openings 32 disposed substantially at the center of the porous body 16, a nozzle portion 20, and a hollow shaft body 31 are integrally formed. It is that.
[0036]
In addition, the thing of the same code | symbol as Example 1 has the same structure, and abbreviate | omits description.
Next, the operation and action will be described. When a high-frequency alternating current generator (not shown) is energized, an alternating magnetic field is generated around the connected excitation coil 19. When the direction of the magnetic field lines of the magnetic field changes according to the supplied AC cycle, an induced current is generated in the outer tube 15, the porous body 16, and the hollow shaft body 31 to generate heat. The fuel pump 24 starts to operate and the fuel supplied into the vaporization section 14 from the fuel supply port 22 is heated and vaporized while penetrating and diffusing through the pores of the heated porous body 16, and the vaporized fuel gas is a hollow shaft. A plurality of openings 32 drilled in the body 31 are fed into the hollow shaft body 31. Since the shaft plug 33 is provided on the fuel supply port 22 side of the hollow shaft body 31, the fuel gas moves through the hollow portion 34 to the nozzle portion 20 side and is ejected from the nozzle portion 20 to burn. In general, high-frequency induction heating has a large skin effect, so that only the surface of the shaft body contributes to heat generation. By reducing the heat capacity of the shaft body by forming a hollow shaft body 31, the heat generation effect is not impaired. The temperature increase rate of the hollow shaft body 31 can be increased. Further, there is no low temperature region near the center as seen in the indirect heating method using a sheathed heater or the like, and the temperature distribution is almost the same at high temperatures from the outside toward the center. Therefore, the temperature distribution of the cross section in the radial direction of the porous body 16 is greatly improved because there is no low temperature portion compared to the conventional heating method only from the outer peripheral direction, and the fuel can be vaporized at a high temperature almost in the entire area of the porous body 16. It has become possible. Therefore, even when a modified oil that has been stored for a long period of time and oxidized and a fuel containing a high-boiling component is used, almost the entire amount can be vaporized, and generation of a tar content can be suppressed. Since the nozzle portion 20 and the hollow shaft body 31 having the plurality of openings 32 are integrally formed, the nozzle portion 20 is heated by heat transfer from the hollow shaft body 31 that is heated and heated to a high temperature. Therefore, tarring of the nozzle part 20 can be suppressed. And it is preferable to use a magnetic material as a material which comprises the hollow shaft 31 which has the some opening 32, and since a magnetic material has high magnetic permeability, the hollow shaft which has the some opening 30 comprised with the magnetic material. Since the body 31 generates more heat and can be heated, the above effect can be further obtained. When magnetic stainless steel such as SUS430 is used as the magnetic material, the vaporization section 14 can be heated at high temperatures because of its excellent heat resistance, and vaporized high-boiling components in the denatured oil or fuel that has been stored and oxidized for a long period of time. Thus, the tar can be further suppressed and the effect is further obtained. Further, since the corrosion resistance is excellent, an effect such as a long durability life is obtained.
[0037]
(Example 4)
FIG. 4 is a cross-sectional view of the vaporizing portion of the liquid fuel combustion apparatus of Embodiment 4 of the present invention.
[0038]
The fourth embodiment is different from the third embodiment in that a hollow shaft body 31 having a nozzle portion 20 and a plurality of openings 32 is joined by a screw portion 35 configuration.
[0039]
In addition, the thing of the same code | symbol as Example 3 has the same structure, and abbreviate | omits description.
And the effect similar to the effect of Example 3 is acquired, At the same time, since the nozzle part 20 and the hollow shaft 31 which has the some opening 32 are joined by the screw part 35, it generate | occur | produces heat and it becomes high temperature. Since the nozzle part 20 becomes high temperature by heat transfer from the hollow shaft body 31 thus formed, the tar part of the nozzle part 20 can be suppressed.
[0040]
【The invention's effect】
As described above, according to the liquid fuel combustion apparatus of the first aspect of the present invention, the porous body and the shaft body are disposed in the outer tube around which the excitation coil is wound, and the excitation coil is provided in the nozzle portion. Therefore, the outer tube, porous body, shaft body, and nozzle part self-heats due to the induction current, so the heating time is greatly shortened compared to the indirect heating by the conventional sheathed heater etc. The time to reach the possible temperature can be greatly reduced. And since it is heated to high temperature to the inner peripheral side in the radial direction of the porous body, the temperature distribution is improved and the vaporization of fuel is promoted, so that tar generation can be suppressed. And since the nozzle part generates heat due to the induction current and becomes high temperature, fuel does not exist as droplets in the nozzle part, and even if the fuel condenses on the inner wall of the nozzle part, it is almost completely vaporized and the nozzle part Taring can be suppressed.
[0041]
The liquid fuel combustion apparatus according to claim 2 has a configuration in which a porous body and a shaft body are arranged in an outer tube around which an exciting coil is wound, and the exciting coil is provided on the outer peripheral portion of the nozzle portion. Can be hot.
[0042]
Further, the liquid fuel combustion apparatus according to claim 3 has a configuration in which the excitation coil is provided so as to surround both the outer tube and the nozzle portion, and the configuration can be simplified because the excitation coil can be shared.
[0043]
Further, in the liquid fuel combustion apparatus according to claim 4, since the nozzle portion is made of a magnetic material, the magnetic material has a high magnetic permeability. Therefore, the nozzle portion made of the magnetic material can generate more heat and can be heated. Can be further suppressed.
[0044]
In the liquid fuel combustion apparatus according to claim 5, the shaft body is a hollow shaft body having a plurality of openings, and the nozzle portion and the hollow shaft body having the plurality of openings are integrally formed. The heat capacity is reduced, and the time to reach the vaporizable temperature from turning on the power can be further shortened. And since it is heated to high temperature to the inner peripheral side in the radial direction of the porous body, the temperature distribution is improved and the vaporization of fuel is promoted, so that tar generation can be suppressed. And since the nozzle part becomes high temperature due to heat transfer from the hollow shaft body, fuel does not exist as droplets in the nozzle part, and even if the fuel condenses on the inner wall of the nozzle part, it is almost completely vaporized. And tarring of the nozzle part can be suppressed.
[0045]
Further, in the liquid fuel combustion apparatus according to the sixth aspect, the shaft body is a hollow shaft body having a plurality of openings, and the nozzle portion and the hollow shaft body having the plurality of openings are joined by a screw configuration. Due to heat transfer from the hollow shaft having a plurality of openings, the nozzle portion becomes high temperature and tarring of the nozzle portion can be suppressed.
[0046]
Further, in the liquid fuel combustion apparatus according to the seventh aspect, since the hollow shaft having a plurality of openings is made of a magnetic material, the magnetic material has a high magnetic permeability, so that the hollow having a plurality of openings made of a magnetic material is used. The shaft body can generate more heat and increase the temperature.
[0047]
According to the eighth aspect of the present invention, since the hollow shaft having a plurality of openings is made of magnetic stainless steel, the same effect as described above can be obtained, and at the same time, the magnetic stainless steel has higher heat resistance than a copper alloy or the like. Since it is excellent, the temperature of the hollow shaft body having a plurality of openings can be increased, so that the temperature of the vaporization section can be set higher than before, so that fuel can be vaporized at a higher temperature and tarring is further suppressed. be able to.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a liquid fuel combustion apparatus according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a vaporization section of the liquid fuel combustion apparatus according to a second embodiment of the present invention. FIG. 4 is a cross-sectional view of a vaporization section of a liquid fuel combustion apparatus according to a fourth embodiment of the present invention. FIG. 5 is a cross-sectional view of a main portion of a conventional liquid fuel combustion apparatus. Explanation of]
14 Vaporization part 15 Outer tube 16 Porous body 17 Shaft body 19, 21, 30 Excitation coil 20 Nozzle part 22 Fuel supply port 25 High frequency alternating current generation part 26 Burner 31 Hollow shaft body 32 Multiple openings 35 Screw part

Claims (8)

A burner for burning vaporized gas, an outer tube provided with a nozzle portion at one end and a fuel supply port at the other end, an excitation coil disposed on the outer peripheral side of the outer tube and connected to a high-frequency alternating current generator, A liquid fuel combustion apparatus comprising: a porous body mounted in an outer tube; a shaft disposed inside the porous body; and an exciting coil that heats the nozzle portion by a magnetic field. The liquid fuel combustion apparatus according to claim 1, wherein an exciting coil is provided on an outer peripheral portion of the nozzle portion. The liquid fuel combustion apparatus according to claim 1, wherein the exciting coil is provided so as to surround both the outer tube and the nozzle portion. The liquid fuel combustion apparatus according to any one of claims 1 to 3, wherein the nozzle portion is made of a magnetic material. A burner for burning vaporized gas, an outer tube provided with a nozzle portion at one end and a fuel supply port at the other end, an excitation coil disposed on the outer peripheral side of the outer tube and connected to a high-frequency alternating current generator, A porous body mounted in the outer tube, a hollow shaft body having a plurality of openings disposed substantially at the center of the porous body, and a nozzle body and a hollow shaft body having the plurality of openings are integrally configured. Liquid fuel combustion device. The liquid fuel combustion apparatus according to claim 5, wherein the nozzle and the hollow shaft having a plurality of openings are joined in a screw configuration. The liquid fuel combustion apparatus according to any one of claims 5 to 6, wherein a hollow shaft having a plurality of openings is made of a magnetic material. The body fuel combustion apparatus according to any one of claims 5 to 7, wherein a hollow shaft having a plurality of openings is made of magnetic stainless steel.

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