JP2000205516A - Liquid duel combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the preheating time in the vaporizing section of a liquid fuel combustor and to suppress the occurrence of tar in the vaporizing section and clogging due to generated tar in the section. SOLUTION: A liquid fuel combustor is provided with a flat vaporizing chamber 25 having a nozzle section 23 at one end and a fuel supply port 27 at the other end and heating means 20a and 20b which heat the chamber 26. The combustor is also provided with a space section 20 for housing tar between a vaporizing element 28a on the nozzle section 23 side and a vaporizing element 28b on the fuel supply port 27 side. Therefore, the time until the vaporizing chamber 25 reaches the vaporizing temperature of fuel after the heating means 30a and 30b are conducted can be shortened at the time of starting the operation of the combustor. It also becomes possible to vaporize the fuel in almost all parts in the chamber 26. In addition, since the volume of the space section 29 is larger than the volume of pores in the elements 28a and 29b and a large quantity of generated tar component can be housed in the section 29, the occurrence of clogging in the chamber 25 due to generated tar can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel combustion apparatus, and more particularly to a fuel vaporization section.

[0002]

2. Description of the Related Art Conventionally, this type of combustion apparatus is disclosed in
Japanese Patent Application Laid-Open No. 8509 has proposed such a device. This will be described with reference to FIG.

[0003] In the figure, reference numeral 1 denotes a vaporizer, and a circular bar is provided above the vaporizer.
The burner receiving seat 2 is provided, a nozzle portion 3 is disposed substantially at the center of the burner receiving seat 2, and an opening 4 for supplying combustion air is provided between the burner receiving seat 2 and the nozzle portion 3. . Then, a cylindrical vaporizing chamber 6 is formed through a communication port 5 communicating with the nozzle section 3, and a vaporizing element 7 for promoting vaporization of fuel is provided in the vaporizing chamber 6, and a vaporizing element 7 on the opposite side of the nozzle section 3. A fuel supply port 8 for supplying fuel is provided at the end. A U-shaped heater 9 is provided along the lower half of the burner receiving seat 2 on the opposite side of the vaporizing chamber 6 of the vaporizer 1. Numeral 10 denotes a mixing tube mounted on the upper part of the burner receiving seat 2 together with a combustion part 12 having a large number of flame holes 11.

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 filler port 8, and the fuel is vaporized in the high temperature vaporizing element 7. To start. The fuel gas vaporized in the vaporization chamber 6 is jetted from the nozzle 3 into the mixing pipe 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, and is ejected from a flame hole 11 formed in a combustion section 12 to burn. Then, the combustion exhaust gas generated by the combustion is mixed with air to become warm air and used for heating or the like. When the combustion is started, the heat receiving flange 2 formed on the burner receiving seat 2 by the heat of combustion.
Since the vaporization chamber 6 is heated via a, heating by the heater 9 becomes unnecessary, and the combustion is continued while the fuel is vaporized by its own combustion heat.

[0005]

However, in the combustion apparatus having the structure described in Japanese Patent Application Laid-Open No. 8-68509, the heater 9 is used to heat the carburetor 1 at the start of combustion.
And an indirect heating method in which heat generated by the heater 9 is heated through a metal part of the vaporizer 1 to heat the vaporizing element 7 for vaporizing the fuel. Therefore, there is a problem that the time from when the heater 9 is energized to when the vaporizing element 7 reaches the fuel vaporizable temperature becomes unexpectedly long. In addition, when the liquid fuel is vaporized because the vaporizing element 7 for vaporizing the fuel has a columnar shape and the internal temperature is hardly increased, particularly when the fuel contains a oxidized deteriorated oil or a high-boiling heterogeneous component that has been stored for a long period of time. When used, the fuel cannot be completely vaporized,
A tar component was generated in the pores in the vaporizing element 7 to cause clogging. Further, because the internal temperature is low, the fuel cannot be completely vaporized in the vaporization element 7, and the residence time of the fuel in the tar generation temperature range becomes long, so that the tar component is contained in the pores in the vaporization element 7. By being generated, clogging of the vaporizing element 7 is to be hastened. If a tar component is generated in the vaporizing element 7 and clogging occurs, the flow path resistance in the vaporizing chamber 6 increases, and the resistance reduces the amount of fuel supplied from the fuel supply means 13 to burn. The amount has decreased,
Eventually, it was possible that the combustion limit was exceeded and poor combustion occurred. Further, in the vaporized fuel gas, poorly vaporized fuel becomes liquid droplets (liquid fine particles) and moves to the nozzle portion 3, adheres to the inner wall of the nozzle portion 3, and is tared to form the nozzle portion 3.
And the clogging may cause poor combustion. Accordingly, the present invention is to solve such a conventional problem and to vaporize the fuel in a short time, suppress the clogging of the tar component, and reduce the combustion failure due to the clogging.

[0006]

According to the present invention, there is provided a burner for burning a vaporized gas, a substantially flat vaporization chamber having a nozzle at one end and a fuel supply port at the other end. Heating means for heating the substantially flat vaporization chamber,
A porous vaporizing element is disposed on the nozzle portion side and the fuel supply port side of the substantially flat vaporizing chamber, respectively, and tar is accommodated between the vaporizing element on the nozzle portion side and the vaporizing element on the fuel supply port side. A space is provided.

[0007] According to the above invention, since the vaporization chamber is directly heated from both sides by the heating means, and since the vaporization chamber is flat, the vaporization chamber is turned on after the energization of the heating means is started at the start of operation. The time required to reach a predetermined temperature (a temperature at which fuel can be vaporized) can be significantly reduced as compared with the conventional case. Further, since the vaporization chamber has a flat shape, the temperature in the vaporization chamber does not have a low-temperature region, and has substantially the same temperature distribution from the outside toward the center at a high temperature. Therefore, the temperature distribution of the vaporizing element and the space portion is significantly improved because there is no low-temperature portion as compared with the prior art, and the fuel can be vaporized at a high temperature in almost the entire region in the vaporizing chamber. Then, the residence time of the fuel in the tar generation temperature range is reduced, and clogging of the vaporizing element can be suppressed. Therefore, even if a fuel containing a oxidized deteriorated oil or a high-boiling component that has been stored for a long period of time is used, almost the entire amount can be vaporized, and the production of tar can be suppressed. Also, at this time, some tar components are inevitably generated, but since the space is provided at the most active position of vaporization in the vaporization chamber, the volume of the space is larger than the volume of the pores in the vaporization element and generated. Since a large amount of tar components can be stored, poor combustion caused by a decrease in the amount of combustion due to an increase in flow path resistance in the vaporization chamber can be reduced. At the same time, the vaporized gas in the fuel and the unvaporized liquid droplets (liquid fine particles) are mixed and move toward the nozzle section side, and when passing through the vaporizing element on the nozzle section side, are not vaporized by the high-temperature vaporizing element. Droplets (liquid fine particles) are further heated to become a vaporized gas, and the vaporization can be completed in the vaporization chamber, so that clogging of the nozzle portion by the tar component can be avoided.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid fuel combustion apparatus according to a first aspect of the present invention includes a burner for burning a vaporized gas, a substantially flat vaporization chamber having a nozzle at one end and a fuel supply port at the other end. Comprising a heating means for heating the substantially flat vaporization chamber,
A porous vaporizing element is disposed on the nozzle side and the fuel supply port side of the substantially flat vaporizing chamber, respectively, and tar is stored between the vaporizing element on the nozzle part side and the vaporizing element on the fuel supply port side. A space portion is provided.

Since the vaporization chamber is directly heated from both sides by the heating means and the vaporization chamber is flat, the vaporization chamber is heated to a predetermined temperature ( The time required to reach the temperature at which fuel can be vaporized) can be significantly reduced as compared with the conventional case. Further, since the vaporization chamber has a flat shape, the temperature in the vaporization chamber does not have a low-temperature region, and has substantially the same temperature distribution from the outside toward the center at a high temperature. Therefore, the temperature distribution of the vaporizing element and the space portion is significantly improved because there is no low-temperature portion as compared with the prior art, and the fuel can be vaporized at a high temperature in almost the entire region in the vaporizing chamber. Then, the residence time of the fuel in the tar generation temperature range is reduced, and clogging of the vaporizing element can be suppressed. Therefore, even if a fuel containing a oxidized deteriorated oil or a high-boiling component that has been stored for a long period of time is used, almost the entire amount can be vaporized, and the production of tar can be suppressed. Also, at this time, some tar components are inevitably generated, but since the space is provided at the most active position of vaporization in the vaporization chamber, the volume of the space is larger than the volume of the pores in the vaporization element and generated. Since a large amount of tar components can be stored, poor combustion caused by a decrease in the amount of combustion due to an increase in flow path resistance in the vaporization chamber can be reduced. At the same time, the vaporized gas in the fuel and the unvaporized liquid droplets (liquid fine particles) are mixed and move toward the nozzle section side, and when passing through the vaporizing element on the nozzle section side, are not vaporized by the high-temperature vaporizing element. Droplets (liquid fine particles) are further heated to become a vaporized gas, and the vaporization can be completed in the vaporization chamber, so that clogging of the nozzle portion by the tar component can be avoided.

In the liquid fuel combustion apparatus according to a second aspect of the present invention, the pore diameter of the porous vaporizing element on the nozzle portion side is smaller than the pore diameter of the porous vaporizing element on the fuel supply port side.

The pore diameter of the porous element on the nozzle side is made smaller than the pore diameter of the porous body on the fuel supply port side,
Since the small fine particles of the liquid which are not vaporized can be reliably collected and heated by the small pore diameter, the vaporization can be completed in the vaporization chamber.

According to a third aspect of the present invention, there is provided a liquid fuel combustion apparatus wherein the porosity of the porous vaporizing element on the nozzle side is smaller than the porosity of the porous vaporizing element on the fuel supply port side. .

The porosity of the porous vaporizing element on the nozzle side is made smaller than the porosity of the porous vaporizing element on the fuel supply port side, and the vaporizing element with a small porosity has a large heat capacity. The vaporized droplets (liquid fine particles) are further heated to become a vaporized gas, and the vaporization can be completed in the vaporization chamber.

In the liquid fuel combustion apparatus according to a fourth aspect of the present invention, a space for accommodating tar is formed inside a porous vaporizing element provided in a substantially flat vaporizing chamber.

Since the vaporizing chamber is directly heated from both sides by the heating means and the vaporizing chamber is flat, the vaporizing chamber is heated to a predetermined temperature ( The time required to reach the temperature at which fuel can be vaporized) can be significantly reduced as compared with the conventional case. Further, since the vaporization chamber has a flat shape, the temperature in the vaporization chamber does not have a low-temperature region, and has substantially the same temperature distribution from the outside toward the center at a high temperature. Therefore, the temperature distribution of the vaporizing element and the space portion is significantly improved because there is no low-temperature portion as compared with the prior art, and the fuel can be vaporized at a high temperature in almost the entire region in the vaporizing chamber. Then, the residence time of the fuel in the tar generation temperature range is reduced, and clogging of the vaporizing element can be suppressed. Therefore, even if a fuel containing a oxidized deteriorated oil or a high-boiling component that has been stored for a long period of time is used, almost the entire amount can be vaporized, and the production of tar can be suppressed. Also, at this time, some tar components are inevitably generated, but since the space is provided inside the vaporization element at the most active position of vaporization in the vaporization chamber, the volume of the space is larger than the volume of the pores in the vaporization element. Therefore, since the generated tar component can be stored in a large amount, poor combustion caused by a decrease in the amount of combustion due to an increase in flow path resistance in the vaporization chamber can be reduced. At the same time, the vaporized gas in the fuel and the unvaporized liquid droplets (liquid fine particles) are mixed and move toward the nozzle side, and pass through the vaporizing element downstream from the space inside the vaporizing element. The unvaporized droplets (liquid fine particles) are further heated to become a vaporized gas, and the vaporization can be completed in the vaporization chamber, so that clogging of the nozzle portion by the tar component can be avoided.

According to a fifth aspect of the present invention, there is provided a liquid fuel combustion apparatus, wherein a plurality of horizontally long spaces are provided between a nozzle portion side and a fuel supply port side of a porous vaporizing element provided in a substantially flat vaporizing chamber. It constitutes a part.

Further, the fuel supplied from the filler port is permeated and diffused into the vaporizing element around the space, and is uniformly sent from the entire periphery of the space to the space, thereby further promoting the vaporization of the fuel in the space. Therefore, tar formation can be further suppressed.

According to a sixth aspect of the present invention, there is provided a liquid fuel combustion apparatus in which a substantially rectangular cutout is provided on an outer periphery of a porous vaporizing element provided in a substantially flat vaporizing chamber to form a space. It is.

Further, the fuel supplied from the fuel supply port penetrates and diffuses into the vaporizing element located between the space portions and is uniformly sent to the space portion, and the vaporization of the fuel in the space portion can be further promoted. Can be further suppressed.

In a liquid fuel combustion apparatus according to a seventh aspect of the present invention, a substantially rectangular concave portion is formed on one of the upper and lower surfaces of a porous vaporizing element provided in a substantially flat vaporizing chamber. It is what constituted.

Then, the fuel supplied from the filler port penetrates and diffuses into the vaporizing element below (or above) the space, and is uniformly sent to the space from below (or above) the entire surface of the space. The vaporization of the fuel in the section can be further promoted, so that tar formation can be further suppressed.

A liquid fuel combustion apparatus according to claim 8 of the present invention has a space portion formed by forming substantially rectangular concave portions on both upper and lower surfaces of a porous evaporating element provided in a substantially flat vaporizing chamber. It is.

Then, the fuel supplied from the filler port is permeated and diffused into the vaporizing element between the upper and lower spaces, and is uniformly sent to the space from both the upper and lower surfaces of the space. Can be further promoted, so that tar formation can be further suppressed.

According to a ninth aspect of the present invention, there is provided a liquid fuel combustion apparatus wherein the vaporizing element is formed of a metal porous body or a wire.

Further, by using a metal material having good heat conductivity, the temperature can be further increased to the inside, and the vaporization of fuel can be promoted. In addition, since the vaporizing element is made of a material made of a metal wire such as a porous body or a wire net, vaporization can be promoted by increasing the vaporizing area.

According to a tenth aspect of the present invention, there is provided a liquid fuel combustion apparatus wherein the temperature of the nozzle portion of the vaporization chamber is higher than the temperature of the fuel supply port.

In the space, most of the fuel is at a vaporizable temperature and the vaporization is most active (the amount of tar component generated by vaporization is also large). Since a large space can be set, clogging due to tar components can be suppressed.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view showing a main part of a liquid fuel combustion apparatus according to Embodiment 1 of the present invention, FIG. 2 is a top view of a vaporization section of the liquid combustion apparatus, and FIG. It is a bottom view of the vaporization part of FIG.

In FIG. 1 to FIG. 3, reference numeral 21 denotes a vaporizer, which is provided with a circular burner receiving seat 22 at an upper portion thereof, and a nozzle 23 is disposed substantially at the center of the burner receiving seat 22. An opening 24 through which combustion air flows is provided between the receiving seat 22 and the nozzle portion 23. Reference numeral 25 denotes a vaporization chamber, one end of which communicates with the nozzle 23 via a vaporized gas passage 26, and a fuel supply port 27 provided at the other end. 28a is a nozzle portion 2 in the vaporization chamber 25.
A vaporizing element 28b provided on the third side is a vaporizing element provided on the side of the fuel supply port 27 in the vaporizing chamber 25. A space 29 for accommodating tar is provided between the vaporizing element 28a on the nozzle 23 side and the vaporizing element 28b on the fuel supply port 27 side. Numerals 30a and 30b are provided so as to sandwich the vaporization chamber 25 from both sides by heating heaters as heating means. Reference numeral 31 denotes a mixing tube located above the nozzle portion 23 and mounted on the burner receiving seat 22, and 32 denotes a bar having a plurality of flame holes 33 formed in a lower peripheral wall.
Na part. Reference numeral 34 denotes a fuel pump for supplying fuel to the vaporizing section 21, reference numeral 35 denotes a needle for opening and closing the nozzle 23, and reference numeral 36 denotes a solenoid for driving the needle 35.

Next, the operation and operation will be described. When the heating heaters 30a and 30b are energized and the vaporization chamber 25 reaches a predetermined temperature, the fuel pump 34 is started to supply fuel from the fuel supply port 27 into the vaporization chamber 25. Fuel supply port 27
The fuel further supplied into the vaporization chamber 25 is permeated and diffused into the pores of the vaporization element 28b having a pore, and the permeated and diffused fuel diffuses over the entire surface of the space portion 29 and moves while being heated and vaporized, The gas is heated to a higher temperature by the vaporizing element 28a, becomes a vaporized gas, moves toward the nozzle 23, and is ejected from the nozzle 23 via the vaporized gas passage 26. When the vaporized gas is ejected from the nozzle portion 23, the primary air is sucked from the opening 24 by the ejector effect and mixed with the vaporized gas in the mixing pipe 31 via the burner portion 32 and the flame hole portion 33.
Combustion.

According to the structure of this embodiment, the heating chamber 30 is directly heated by the heating heaters 30a and 30b from both sides, and the heating chamber is flat when the vaporizing chamber 25 is started. The time required for the vaporization chamber 25 to reach a predetermined temperature (a temperature at which fuel can be vaporized) from the start of energization of the heaters 30a and 30b can be significantly reduced as compared with the related art. Further, since the vaporization chamber 25 has a flat shape, the temperature in the vaporization chamber 25 does not have a low-temperature region inside as seen in the column-shaped vaporization element 7, and the temperature distribution from the outside to the center increases at a substantially high temperature distribution. Becomes Therefore, the vaporizing elements 28a, 28
The temperature distribution of the space b and the space 29 is significantly improved because there is no low-temperature part compared to the prior art, and it is possible to vaporize the fuel at a high temperature in almost the entire area in the vaporization chamber 25. Then, the residence time of the fuel in the tar generation temperature range is reduced, and the vaporization element 28
a, 28b can be prevented from being clogged. Therefore, even if a fuel containing a oxidized deteriorated oil or a high-boiling component that has been stored for a long period of time is used, almost the entire amount can be vaporized, and the production of tar can be suppressed. Also, at this time, some tar components are inevitably generated, but the space 29 is provided at the most active position of vaporization in the vaporization chamber 25, so that the volume of the space 29 is limited to the vaporization elements 28a and 28a.
Since the volume of the generated tar component is larger than the volume of the pores in b and the generated tar component can be accommodated in a large amount, poor combustion caused by a decrease in the amount of combustion due to an increase in flow path resistance in the vaporization chamber 25 can be reduced. At the same time, when the vaporized gas in the fuel and the unvaporized droplets (liquid fine particles) are mixed and move toward the nozzle portion 23 and pass through the vaporizing element 28a, the high-temperature vaporizing element 28a The droplets (liquid fine particles) are further heated to become a vaporized gas, and the vaporized chamber 2
5, the vaporization can be completed within the nozzle portion 23.
Clogging due to the tar component can be avoided.

It is preferable that the pore diameter of the porous vaporizing element 28a on the nozzle portion 23 side is smaller than the pore diameter of the porous body on the fuel supply port 27 side. Therefore, vaporization can be completed in the vaporization chamber 25. Further, it is preferable that the porosity of the porous vaporizer 28a on the nozzle portion 23 side is smaller than the porosity of the porous vaporizer 28b on the fuel supply port 27 side. The droplets (liquid fine particles) which are large and have not been vaporized are further heated to become vaporized gas, and vaporization can be completed in the vaporization chamber 25. Here, the vaporizing elements 28a and 28b are connected to the vaporizing chamber 25.
Because the material is heated from both sides, even materials with relatively low thermal conductivity, such as ceramics, can be heated to the inside.However, by using a metal material with good heat conductivity, it is possible to further increase the temperature to the inside, and to evaporate the fuel. Can be promoted. Further, by forming the vaporizing elements 28a and 28b from a porous body or a material made of a metal wire such as a wire net, the contact area with the fuel can be increased, and the vaporization area is increased, thereby promoting the vaporization. can do.

Further, the heat generation density of the heating heaters 30a and 30b is set to be close to the fuel supply port
By making the temperature on the side of the nozzle portion 23 in the vaporization chamber 25 higher than the temperature on the side of the fuel supply port 27 by roughening the side 7, the vaporization element 28 on the side of the fuel supply port 27 having a lower temperature is provided.
In the part b, the fuel permeates and diffuses into the vaporization element 28b in a liquid phase state and is heated, and a part of the low boiling point component in the fuel starts to vaporize. In the space part 29, most of the fuel reaches a vaporizable temperature and vaporizes. Is the most active (the amount of tar component generated by vaporization is large), and the nozzle portion 23 having a higher temperature
The vaporization element 28a on the side can heat the unvaporized droplets (liquid fine particles) of some high-boiling components in the fuel to complete the vaporization, so that the amount of tar generated in the vaporization chamber 25 is the largest. Since the space portion 29 having the largest volume can be set at the position, clogging due to the tar component can be suppressed.

(Embodiment 2) FIG. 4A is a top view of a vaporizing element of a liquid fuel combustion apparatus according to Embodiment 2 of the present invention.

FIG. 4B is a sectional view taken along line AA of FIG. 4A.

The second embodiment is different from the first embodiment in that a porous vaporizing element 3 is provided in a substantially flat vaporizing chamber 25.
6 is that a space portion 37 for accommodating tar is formed inside the sixth embodiment.

The components having the same reference numerals as in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation will be described.
Is heated directly from both sides by the heating heaters 30a and 30b, and since the vaporization chamber 25 is flat, the heating heaters 30a and 30b are energized at the start of operation, and then the vaporization chamber 25 is heated. Can reach a predetermined temperature (a temperature at which fuel can be vaporized) can be significantly shortened as compared with the related art. Further, since the vaporization chamber 25 is flat, the vaporization chamber 2
The temperature inside 5 does not have a low-temperature region inside as seen in the columnar vaporizing element 7, and has substantially the same temperature distribution from the outside toward the center at a high temperature. Therefore, the temperature distribution of the vaporizing element 36 and the space 37 is significantly improved because there is no low-temperature part as compared with the prior art, and it becomes possible to vaporize the fuel at a high temperature in almost the entire region in the vaporizing chamber 25. The residence time of the fuel in the tar generation temperature range is shortened, and clogging of the vaporizing element 36 can be suppressed. Therefore, even if a fuel containing a oxidized deteriorated oil or a high-boiling component that has been stored for a long period of time is used, almost the entire amount can be vaporized, and the production of tar can be suppressed. Further, at this time, some tar components are inevitably generated, but the space 37 is provided inside the vaporizing element 36 at the position where the vaporization is most active in the vaporizing chamber 25. Since the volume of the tar component is larger than the volume of the fine pores and a large amount of the generated tar component can be accommodated, poor combustion caused by a decrease in the amount of combustion due to an increase in flow path resistance in the vaporization chamber 25 can be reduced. At the same time, the vaporized gas in the fuel and the unvaporized liquid droplets (liquid fine particles) are mixed and move toward the nozzle 23 side, and when passing through the vaporization element 36 downstream from the space 37, Evaporated droplets (liquid fine particles)
Is further heated and becomes a vaporized gas, and vaporization can be completed in the vaporization chamber 25, so that clogging of the nozzle portion 23 by the tar component can be avoided. Here, since the vaporizing chamber 36 is heated from both sides, the vaporizing chamber 25 can be heated even to a material having relatively low thermal conductivity such as ceramics. This makes it possible to promote fuel vaporization.

Further, by forming the vaporizing element 36 from a material made of a metal wire such as a porous body or a wire mesh, the contact area with the fuel can be increased, and the vaporization area can be increased to increase the vaporization area. Can be promoted.

Further, the heat generation density of the heating heaters 30a and 30b is set so that the density of the fuel supply port
By making the temperature on the side of the nozzle section 23 in the vaporization chamber 25 higher than the temperature on the side of the fuel supply port 27 by roughening the side 7, the fuel in the vaporization element 36 on the side of the fuel supply port 38 with a lower temperature becomes liquid. In a phase state, the fuel is infiltrated and diffused into the vaporization element 36 and is heated, so that a part of the low-boiling components in the fuel starts to vaporize. In the space 37, most of the fuel reaches a vaporizable temperature and vaporization is most active (by vaporization). The amount of generated tar components is also large), and the unvaporized droplets (liquid fine particles) of some high-boiling components in the fuel are heated in the vaporization element 36 downstream of the space 37 having a higher temperature. Since the vaporization can be completed, the space portion 37 having the largest volume can be set in the vaporization chamber 25 at a position where the amount of tar generation is the largest, so that clogging due to the tar component can be suppressed.

Embodiment 3 FIG. 5A is a top view of a vaporizing element of a liquid fuel combustion apparatus according to Embodiment 3 of the present invention.

FIG. 5B is a sectional view taken along line AA of FIG. 5A.

The third embodiment is different from the second embodiment in that a porous vaporizing element 3 is provided in a substantially flat vaporizing chamber 25.
9 is that a plurality of horizontally long space portions 40 are formed between the nozzle portion 23 side and the fuel supply port side 27.

The components having the same reference numerals as those in the second embodiment have the same structure, and the description is omitted.

The same effect as that of the second embodiment can be obtained, and at the same time, the fuel supplied from the fuel supply port 38 penetrates and diffuses into the vaporizing element 39 around the space portion 40, and from all around the space portion 40. Since the fuel is uniformly sent to the space 40 and the vaporization of the fuel in the space 40 can be further promoted, tar formation can be further suppressed.

(Embodiment 4) FIG. 6A is a top view of a vaporizing element of a liquid fuel combustion apparatus according to Embodiment 4 of the present invention.

FIG. 6B is a sectional view taken along line AA of FIG. 6A.

The fourth embodiment is different from the second embodiment in that a porous vaporizing element 4 is provided in a substantially flat vaporizing chamber 25.
A substantially rectangular notch is provided on the outer periphery of
It is the point which comprised.

The components having the same reference numerals as those in the second embodiment have the same structure, and the description is omitted. The same effect as that described in the second embodiment can be obtained, and at the same time, the fuel supplied from the fuel supply port 38 permeates and diffuses into the central portion of the vaporizing element between the space portions 42 and is uniformly sent to the space portion 42. As a result, the vaporization of the fuel in the space 42 can be further promoted, so that the tar formation can be further suppressed.

(Embodiment 5) FIG. 7A is a top view of a vaporizing element of a liquid fuel combustion apparatus according to Embodiment 5 of the present invention. FIG. 7B is a cross-sectional view taken along line AA of FIG. 7A.

The fifth embodiment is different from the second embodiment in that a porous vaporizing element 4 provided in a substantially flat vaporizing chamber 25 is provided.
3 in that a substantially rectangular concave portion is formed on the upper surface of the upper surface 3 to form the space portion 44.

The components having the same reference numerals as in the second embodiment have the same structure, and a description thereof will be omitted.

The same effect as that described in the second embodiment can be obtained, and at the same time, the fuel supplied from the fuel supply port 38 penetrates and diffuses into the vaporizing element 43 below the space portion 44, and the entire surface under the space portion 44. From above to the space portion 44, and the vaporization of the fuel in the space portion 44 can be further promoted, so that tar formation can be further suppressed.

In the fifth embodiment, a description has been given of the case where the substantially rectangular concave portion is formed on the upper surface of the vaporizing element 43 to form the space portion 44. However, the substantially rectangular concave portion is formed on the lower surface of the vaporizing element 43. The same effect as the effect described in the fifth embodiment can be obtained also in the configuration in which the space portion 44 is formed.

(Embodiment 6) FIG. 8A is a top view of a vaporizing element of a liquid fuel combustion apparatus according to Embodiment 6 of the present invention. FIG. 8B is a cross-sectional view taken along line AA of FIG. 8A.

The sixth embodiment is different from the second embodiment in that a porous vaporizing element 4 is provided in a substantially flat vaporizing chamber 25.
5 are formed on both upper and lower surfaces to form substantially rectangular recesses.
a, 46b.

The components having the same reference numerals as those of the second embodiment have the same structure, and the description is omitted.

The same effect as that of the second embodiment is obtained, and at the same time, the fuel supplied from the fuel supply port 38 is permeated and diffused into the vaporizing element 45 between the upper and lower spaces 46a and 46b, and the space is formed. The gas is uniformly sent from both upper and lower surfaces of the upper and lower portions 46a and 46b to the spaces 46a and 46b, and the vaporization of the fuel in the spaces 46a and 46b can be further promoted. Therefore, tar formation can be further suppressed.

[0060]

As described above, according to the liquid fuel combustion apparatus of the first aspect of the present invention, a substantially flat vaporizing chamber and a heating means for heating the substantially flat vaporizing chamber are provided. A porous vaporizing element is disposed on the nozzle side and the fuel supply port side of the vaporizing chamber, and a space for accommodating tar is provided between the vaporizing element on the nozzle side and the vaporizing element on the fuel supply port side. With this configuration, the time required for the vaporization chamber to reach a temperature at which fuel can be vaporized after the energization of the heating means is started at the start of operation can be significantly reduced. Further, since the vaporization chamber is flat, the temperature in the vaporization chamber does not have a low-temperature region and the vaporization element,
The temperature distribution in the space was much better than in the past, and it was possible to vaporize the fuel at a high temperature in almost all areas in the vaporization chamber. Then, the residence time of the fuel in the tar generation temperature range is reduced, and clogging of the vaporizing element can be suppressed. Since the space is provided at the most active position of vaporization in the vaporization chamber, the volume of the space is larger than the volume of the pores in the vaporization element, and a large amount of the generated tar component can be stored. Combustion failures caused by a decrease in the amount of combustion due to an increase in indoor flow path resistance can be reduced.
And at the same time, when passing through the high-temperature vaporization element on the nozzle side,
The unvaporized droplets (liquid fine particles) are further heated to become a vaporized gas, and the vaporization can be completed in the vaporization chamber, so that clogging of the nozzle portion by the tar component can be avoided.

In the liquid fuel combustion apparatus according to the present invention, the pore diameter of the porous vaporizing element on the nozzle portion side is made smaller than the pore diameter of the porous vaporizing element on the fuel supply port side.
The small pore size of the vaporizing element of the porous body on the nozzle side can reliably collect and heat smaller unvaporized liquid fine particles and complete the vaporization in the vaporization chamber, so that clogging due to tar components is suppressed. Can be.

In the liquid fuel combustion apparatus according to the third aspect, the porosity of the porous vaporizing element on the nozzle portion side is made smaller than the porosity of the porous vaporizing element on the fuel supply port side.
Since the vaporizing element of the porous body on the nozzle portion side with a small porosity has a large heat capacity, the unvaporized droplets are further heated to become a vaporized gas, and the vaporization can be completed in the vaporization chamber, so that clogging by the tar component can be avoided. .

Further, in the liquid fuel combustion apparatus according to the fourth aspect, the space for accommodating the tar is formed inside the porous vaporizing element provided in the substantially flat vaporizing chamber. The time required for the vaporization chamber to reach a temperature at which fuel can be vaporized after the power supply is started can be greatly reduced. In addition, since the vaporization chamber is flat, the temperature inside the vaporization chamber has no low-temperature region and the temperature distribution in the vaporization element and space is much better than in the past, and fuel can be vaporized at high temperature in almost the entire region of the vaporization chamber. It has become possible. Then, the residence time of the fuel in the tar generation temperature range is reduced, and clogging of the vaporizing element can be suppressed. And since the space is provided inside the vaporization element at the most popular position of vaporization in the vaporization chamber, the volume of the space is larger than the volume of the pores in the vaporization element and accommodates a large amount of the generated tar component. Therefore, it is possible to reduce poor combustion caused by a decrease in the amount of combustion due to an increase in flow path resistance in the vaporization chamber. At the same time, when passing through the vaporization element downstream of the space, the unvaporized droplets (liquid fine particles) are further heated to become a vaporized gas, and the vaporization can be completed in the vaporization chamber. Clogging can be avoided.

In the liquid fuel combustion apparatus according to the fifth aspect, a plurality of horizontally long spaces are provided between the nozzle portion side and the fuel supply port side of the porous vaporizing element provided in the substantially flat vaporizing chamber. With this configuration, the fuel supplied from the filler port penetrates and diffuses into the vaporizing elements around the space, and is sent to the space uniformly from the entire periphery of the space, further promoting the vaporization of fuel in the space. Since tar formation can be further suppressed, clogging due to tar can be suppressed.

In the liquid fuel combustion device according to the sixth aspect, a substantially rectangular notch is provided on the outer periphery of the porous vaporizing element provided in the substantially flat vaporizing chamber to form a space. Therefore, the fuel supplied from the filler port permeates and diffuses into the vaporizing element located between the spaces, and is uniformly sent to the space.The vaporization of the fuel in the space can be further promoted, and the tarification can be further suppressed. Clogging can be suppressed.

In the liquid fuel combustion apparatus according to the present invention, a substantially rectangular concave portion is formed on one of the upper and lower surfaces of a porous vaporizing element housed in a substantially flat vaporizing chamber to form a space. As a result, the fuel supplied from the filler port penetrates and diffuses into the vaporizing element below (or above) the space, and is uniformly sent to the space from below (or above) the entire surface of the space. Since the vaporization of fuel in the section can be further promoted and tar formation can be further suppressed, clogging due to tar can be suppressed.

In the liquid fuel combustion apparatus according to the eighth aspect, a substantially rectangular concave portion is formed on both upper and lower surfaces of a porous vaporizing element housed in a substantially flat vaporizing chamber to form a space. The fuel supplied from the filler port penetrates and diffuses into the vaporizing element located between the upper and lower spaces, and is uniformly sent to the space from both the upper and lower surfaces of the space, thereby further promoting the vaporization of the fuel in the space. Tar formation can be further suppressed, so that clogging due to tar can be suppressed.

Further, in the liquid fuel combustion apparatus according to the ninth aspect, since the vaporizing element is formed of a metal porous body or a wire, heat conduction to the vaporizing element and expansion of the vaporized area can be achieved, so that the fuel is burned. Since vaporization can be further promoted and tar formation can be further suppressed, clogging due to tar can be suppressed.

In the liquid fuel combustion apparatus according to the tenth aspect, the temperature of the nozzle portion of the vaporization chamber is set to be higher than the temperature of the fuel supply port side. The vaporization becomes the most active (the amount of tar components generated by vaporization is also large), and the space with the largest volume can be set at the position where the amount of tar generation is the largest in the vaporization chamber, so that clogging due to tar components can be suppressed. it can.

[Brief description of the drawings]

FIG. 1 is a 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 top view of a vaporization section of the liquid fuel combustion device.

FIG. 3 is a bottom view of a vaporization section of the liquid fuel combustion device.

4A is a top view of a vaporizing element of a liquid fuel combustion device according to a second embodiment of the present invention. FIG. 4B is a cross-sectional view taken along line AA of FIG.

FIG. 5A is a top view of a vaporizing element of a liquid fuel combustion device according to a third embodiment of the present invention. FIG.

6A is a top view of a vaporizing element of a liquid fuel combustion apparatus according to a fourth embodiment of the present invention. FIG. 6B is a cross-sectional view taken along line AA of FIG.

7A is a top view of a vaporizing element of a liquid fuel combustion apparatus according to a fifth embodiment of the present invention. FIG. 7B is a cross-sectional view taken along the line AA of FIG.

8A is a top view of a vaporizing element of a liquid fuel combustion apparatus according to Embodiment 6 of the present invention. FIG. 8B is a sectional view taken along the line AA of FIG.

FIG. 9 is a sectional view of a main part of a conventional liquid fuel combustion device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 21 Vaporization part 23 Nozzle part 25 Vaporization chamber 27 Fuel supply port 28a, 28b, 36, 39, 41, 43, 45 Vaporization element 29, 37, 40, 42, 44, 46a, 46b Space part 30a, 30b Heater 32 Burner 38 Filler

Claims (10)

[Claims] A burner for burning a vaporized gas, a substantially flat vaporization chamber having a nozzle at one end and a fuel supply port at the other end, and a heating means for heating the substantially flat vaporization chamber;
A porous vaporizing element is disposed on the nozzle side and the fuel supply port side of the substantially flat vaporizing chamber, respectively, and tar is stored between the vaporizing element on the nozzle part side and the vaporizing element on the fuel supply port side. A liquid fuel combustion device provided with a space portion to perform. 2. The liquid fuel combustion apparatus according to claim 1, wherein the pore diameter of the porous vaporizing element on the nozzle portion side is smaller than the pore diameter of the porous vaporizing element on the fuel supply port side. 3. The liquid fuel according to claim 1, wherein the porosity of the porous vaporizer on the nozzle side is smaller than the porosity of the porous vaporizer on the fuel supply port side. Combustion equipment. 4. A liquid fuel combustion apparatus according to claim 1, wherein a space for accommodating tar is formed inside the porous vaporizing element provided in the substantially flat vaporizing chamber. 5. The liquid fuel according to claim 4, wherein a plurality of horizontally long spaces are formed between the nozzle portion side and the fuel supply port side of the porous vaporizing element provided in the substantially flat vaporizing chamber. Combustion equipment. 6. The liquid fuel combustion device according to claim 4, wherein a substantially rectangular notch is provided on the outer periphery of the porous vaporizing element provided in the substantially flat vaporizing chamber to form a space. 7. The liquid fuel combustion according to claim 4, wherein a substantially rectangular concave portion is formed on one of upper and lower surfaces of a porous vaporizing element provided in a substantially flat vaporizing chamber to form a space. apparatus. 8. The liquid fuel combustion apparatus according to claim 4, wherein a substantially rectangular concave portion is formed on both upper and lower surfaces of the porous vaporizing element provided in the substantially flat vaporizing chamber to form a space. 9. The liquid fuel combustion apparatus according to claim 1, wherein the vaporizing element is made of a metal porous body or a wire. 10. The liquid fuel combustion apparatus according to claim 1, wherein the temperature of the nozzle section of the vaporization chamber is higher than the temperature of the fuel supply port.