JP3276802B2 - Liquid fuel combustion device - Google Patents

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 petroleum in which the generation and accumulation of tar at the bottom of a vaporization chamber is suppressed by stably burning liquid fuel ejected from a fuel nozzle. The present invention relates to a vaporized liquid fuel combustion device used for a fan heater or the like.

[0002]

2. Description of the Related Art Generally, in this type of liquid fuel combustion apparatus, liquid fuel ejected and supplied by a fuel nozzle is vaporized inside, and the vaporized gas and combustion air are premixed and supplied to a combustion section. Equipped with a vaporizer.

The following is an example of a conventional liquid fuel combustion device.
For in Figure 3 will be described. In Fig. 3, reference numeral 1 denotes a bottomed cylindrical vaporizer having an open top, a peripheral wall 2 of the carburetor 1
A heater 3 composed of a sheathed heater is buried in the upper part of FIG. Reference numeral 4 denotes an elbow-type primary air pipe through which primary air for combustion flows, and one end of the primary air pipe 4 is connected to a blower 6 via a communication pipe 5. Reference numeral 7 denotes a fuel supply pipe through which liquid fuel (kerosene) flows. One end of the fuel supply pipe 7 is connected to a fuel tank 9 via a pump 8 such as an electromagnetic pump. The end is connected to the base end of a fuel nozzle 11 whose front end faces the vaporization chamber 10 inside the vaporizer 1, and liquid fuel is ejected from the front end of the fuel nozzle 11 to the vaporization chamber 10. ing. The fuel tank 9 is provided with a detachable cartridge tank 12.

[0004] Reference numeral 13 denotes a diaphragm plate disposed at an upper opening in the vaporizer 1. A burner head 14 is fitted and mounted on the upper opening of the vaporizer 1 above the diaphragm plate 13. A wire mesh (not shown) is provided on the inner and outer surfaces of the peripheral wall of the burner head 14 and a large number of flame holes 15 are formed. Reference numeral 16 denotes a flame holding plate provided at the upper end of the vaporizer 1.

[0005] Reference numeral 17 denotes a bottomed cylindrical burner case provided on the outer periphery of the carburetor 1 and surrounding the carburetor 1. In the burner case 17, air is supplied from the blower 6 through a secondary air pipe 18. Sent in. The outlet end of the secondary air pipe 18 penetrates the peripheral wall of the burner case 17 and faces the inside of the burner case 17, and the inside of the burner case 17 is obstructed so as to face the outlet portion. A plate 19 is provided.

Next, the vaporizer 1 will be described in detail.
This vaporizer 1 is made of aluminum die-cast,
An air nozzle portion 20 for supplying combustion air having a lateral air passage through which the fuel nozzle 11 is inserted coaxially is formed on the peripheral wall 2 by integral molding.

In FIG. 3, reference numeral 21 denotes an ignition electrode for igniting a mixed gas of vaporized gas and air ejected from the flame hole 15;
A flame rod 22 detects the ignited flame F and detects the oxygen concentration.

In the above configuration, when the vaporizer 1 rises to a predetermined temperature by energizing the heater 3, the blower 6 and the pump 8 operate, and the liquid fuel from the fuel nozzle 11 and the primary air pipe 4 Primary air for combustion is supplied into the vaporization chamber 10 through the air nozzle section 20. At this time,
The combustion air is ejected from the air nozzle section 20 into the vaporization chamber 10, and the liquid fuel ejected from the fuel nozzle 11 is brought into particulate form and brought into contact with the vaporization surface of the vaporization chamber 10. The vaporized gas of the liquid fuel vaporized by contacting the vaporized surface is mixed with the primary air for combustion, and the mixed gas enters the burner head 14 through the passage of the throttle plate 13 and is ejected from the flame hole 15. The jetted gas mixture is ignited by the spark discharge of the ignition electrode 21 to form a flame F and start combustion.

After the start of combustion, the power supply to the heater 3 is stopped, and the vaporizer 1 has a temperature sufficient for vaporizing the liquid fuel by radiant heat from the combustion section or heat conduction from the flame holding plate 16 heated by combustion. Heated.

[0010]

However, in the above-described conventional configuration, the collision surface of the fuel ejected from the fuel nozzle 11 is small as shown by the arrow a in FIG. If it is large, the fuel ejected from the fuel nozzle 11 comes into contact with the vaporization surface of the vaporization chamber 10 and vaporizes, but some liquid fuel particles flow out to the combustion section without vaporization, causing a red fire to breathe, In addition, some fuel cannot be completely vaporized at the collision surface, and flows down to the bottom of the vaporization chamber, causing a time delay of vaporization. As a result, unstable combustion occurs and tar is generated or accumulated at the bottom of the vaporization chamber. There was a problem.

When the fuel flow rate is low, such as during weak combustion, the flow rate of combustion air is low, and the fuel nozzle 11
The fuel ejected from the fuel is hardly atomized, which causes a time delay of vaporization, resulting in unstable combustion and the same problems as in strong combustion.

Further, there is a problem that an odor is generated at the time of starting combustion or at the time of stopping combustion due to a time delay of vaporization of the liquid fuel flowing down to the bottom of the vaporization chamber.

The present invention has been made in view of the above circumstances, and stably burns in a wide range of combustion states from strong combustion to weak combustion, and suppresses the generation and accumulation of tar at the bottom of the vaporization chamber. It is another object of the present invention to provide a liquid fuel combustion device that suppresses generation of odor at the time of starting or stopping combustion.

[0014]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have provided a specific projection at the bottom of the vaporization chamber and a specific rectification cylinder in the vaporization chamber to provide a liquid fuel and The present inventors have found that the above problem can be solved by lengthening the flow path of the mixture of combustion air, increasing the vaporization surface to promote vaporization, and improving the mixing, and the present invention has been accomplished.

According to the first aspect of the present invention, the fuel nozzle and the liquid fuel ejected and supplied by the fuel nozzle are vaporized inside, and the vaporized gas and the combustion air are premixed and supplied to the combustion section. A liquid fuel combustion device comprising a vaporizer, a combustion air supply air nozzle provided on a peripheral wall of the vaporizer, and a blower for feeding combustion air to the air nozzle . Upper rectifying cylinder and lower trim
A rectifying cylinder consisting of a flow cylinder is installed in the vaporization chamber,
The upper end extends into the combustion section, and the lower end of the lower rectifier cylinder is a carburetor.
In order to extend to the vicinity of the bottom, a convex portion is provided on the vaporizer bottom, and the convex portion is located at an interval in the rectifying cylinder, so that the liquid fuel and the combustion air ejected and supplied into the vaporization chamber are formed. A liquid fuel combustion device characterized in that the mixture is supplied to the combustion section after passing around the lower end of the lower flow straightening tube and between the convex portion and the flow straightening tube.

[0016]

According to the first aspect of the present invention, a mixture of the liquid fuel ejected and supplied from the fuel nozzle into the vaporizing chamber and the combustion air ejected and supplied from the air nozzle portion is formed in a turbulent state by the above-mentioned structure. passes between the inner surface of the peripheral wall and the flow-guide cylinder outer surface of the chamber, and then after around the lower end of the lower flow-guide cylinder, fed through between the convex external surface provided in the vaporizing chamber bottom and the gas flow-guide cylinder inner surface upward, the upper rectification Since the liquid fuel and the combustion air are supplied to the combustion section via the inside of the cylinder , the liquid fuel and the combustion air are well mixed while passing through long paths having different flow path shapes, and the liquid fuel ejected and supplied from the fuel nozzle is supplied to the fuel nozzle. The contact surface and the collision surface become wider and the vaporization is performed better.

As described above, the mixing of the liquid fuel and the combustion air becomes better, and the vaporizing surface can be made larger. As a result, all the liquid fuel ejected from the fuel nozzle is instantaneously vaporized. Unstable combustion can be eliminated due to a long vaporization time delay, and stable combustion can be performed, and the problem of tar generation or accumulation at the bottom of the vaporization chamber is eliminated.

Further, since there is no time delay in vaporization of the liquid fuel flowing down to the bottom of the vaporization chamber, no odor is generated at the time of starting combustion or stopping combustion.

Further, the mixing of the liquid fuel and the combustion air becomes better, and the vaporization surface can be made larger, so that even in the case of a large-capacity burner having two rows, three rows or more of flame holes. There is no noise, no breathing of red fire, no uniform flame, no liquid fuel can vaporize, and does not flow down to the bottom of the vaporization chamber. Stable combustion can be performed.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the contents of the present invention will be described more specifically with reference to FIGS. 1 and 2, but the present invention is not limited to these contents.

FIG. 1 is an explanatory view showing a main part of a liquid fuel combustion apparatus according to a first embodiment of the present invention. FIG.
It is a top view explaining the principal part in cross section.

In FIGS. 1 and 2, reference numeral 1b denotes a bottomed cylindrical vaporizer having a convex portion 23 formed integrally with the main body at the bottom and having an open top and a peripheral wall 2 of the vaporizer 1b .
A heater 3 composed of a sheathed heater is buried in the upper part of FIG. Although the convex portion 23 is shown as a hollow example, the convex portion 23
Need not be hollow and may be solid with the bottom. Although the example in which the protrusion 23 is formed integrally with the main body is shown, the protrusion 23 may be formed separately and disposed on the bottom of the vaporizer 1b .

Reference numeral 4 denotes an elbow-type primary air pipe through which primary air for combustion flows, and one end of the primary air pipe 4 is connected to a blower 6 . Reference numeral 7 denotes a fuel supply pipe through which liquid fuel (kerosene) flows. One end of the fuel supply pipe 7 is connected to a fuel tank 9 via a pump 8 such as an electromagnetic pump. The end is connected to the base end of a fuel nozzle 11 whose front end faces the vaporization chamber 10 inside the vaporizer 1b , and liquid fuel is ejected and supplied from the front end of the fuel nozzle 11 to the vaporization chamber 10. ing. The fuel tank 9 is provided with a detachable cartridge tank 12.

Reference numeral 24 denotes an upper rectifying cylinder 24a having one end fixed to the peripheral wall 2 of the upper opening in the carburetor 1b , and a lower rectifying cylinder 24a.
24b , and a top end of the upper rectification tube 24a.
Extends to near the upper end of the burner head 14 in the combustion section,
The lower end of the partial rectification cylinder 24b extends to near the bottom of the carburetor 1b
The protrusions 23 are arranged at intervals in the lower rectifying cylinder 24b . This lower rectifying cylinder 24b
A burner head 14 is fitted and mounted on the upper opening of the vaporizer 1b on the top. A wire mesh 26 is provided on the inner and outer surfaces of the peripheral wall of the burner head 14, and a large number of flame holes 15 are formed. Reference numeral 16 denotes a flame holding plate provided at the upper end of the vaporizer 1b . 25 is a rectifying cylinder and burner head
14 is a fixture for fixing the vaporizer 14 to the vaporizer 1b.

The material of the flow regulating cylinder 24 is not particularly limited. Aluminum alloy and stainless steel can be preferably used.

The height H of the projection 23 from the bottom of the vaporizer 1b.
Is higher than the height h of the fuel nozzle 11 from the bottom of the carburetor 1b , and the height h of the fuel nozzle 11 is higher than the height ha of the lower end of the rectifying cylinder 24 from the bottom of the carburetor 1b . If these are represented by equations, H>h> ha.

Numeral 17 is provided on the outer periphery of the vaporizer 1b ,
A bottomed cylindrical burner case surrounding the vaporizer 1b ;
Air is blown into the burner case 17 from the blower 6 through the secondary air pipe 18. Also, the secondary air pipe 18
The end outlet of the burner case 17 penetrates the peripheral wall of the burner case 17 and faces the inside of the burner case 17 .

Next, the carburetor 1b will be described in detail. The carburetor 1b is made of aluminum die-casting, and its peripheral wall 2 is provided with a sideways air through which the fuel nozzle 11 is inserted coaxially. An air nozzle portion 20 for supplying combustion air having a passage is formed by integral molding.

In the above-described configuration, when the vaporizer 1b rises to a predetermined temperature by energizing the heater 3, the blower 6 and the pump 8 operate, and the liquid fuel from the fuel nozzle 11 and the primary air pipe 4 Primary air for combustion is supplied into the vaporization chamber 10 through the air nozzle section 20. At this time,
The combustion air is supplied from the air nozzle section 20 to the peripheral wall 2 of the carburetor 1b.
Chamber 10 surrounded by the inner surface of the gasket and the outer surface of the lower rectifying cylinder 24b.
The liquid fuel ejected from the fuel nozzle 11 is made into particles and is brought into contact with the inner surface of the peripheral wall 2 and the vaporized surface of the outer surface of the lower rectifying cylinder 24b.

The mixture of the vaporized gas of the liquid fuel and the combustion air, which has been mostly vaporized by contact, enters a turbulent state and turns around the lower end of the lower rectifying cylinder 24b. The liquid fuel that has not been vaporized passes between the outer surface of the fuel cell 23 and the inner surface of the lower rectifier cylinder 24b, and is brought into contact with these vaporized surfaces to be vaporized, and further mixed with the combustion air to enter the upper rectifier cylinder 24a. The mixed gas is sent upward after being mixed, and the mixed gas exits from the upper rectifying cylinder 24a, enters the burner head 14, and is ejected from the two rows of flame holes 15 . The jetted gas mixture is ignited by spark discharge of an ignition electrode (not shown), and forms two rows of flames F to start combustion.

After the start of combustion, the power supply to the heater 3 is stopped, and the carburetor 1b operates at a temperature sufficient for vaporizing the liquid fuel by radiant heat from the combustion section or heat conduction from the flame holding plate 16 heated by combustion. Heated.

As described above, the liquid fuel and the combustion air are better mixed while passing through the long paths having different flow path shapes.
In addition, the contact surface and collision surface of the liquid fuel become wider, and the vaporization is performed well, so that all the liquid fuel ejected from the fuel nozzle is instantaneously vaporized, and the non-vaporized liquid fuel is sent to the combustion unit, The liquid fuel that cannot be completely converted does not flow down to the bottom of the vaporizer, and stable combustion can be performed.

Therefore, the problem of tar generation and accumulation at the bottom of the vaporization chamber is surely eliminated. Further, since there is no time delay of vaporization of the liquid fuel flowing down to the bottom of the vaporization chamber, no odor is generated at the time of starting combustion or stopping combustion.

[0034]

Since the present invention is constructed as described above, the liquid fuel and the combustion air are well mixed while passing through the long paths having different flow path shapes, and the contact surface and the collision surface of the liquid fuel are not mixed. With a wide area and good vaporization, all the liquid fuel ejected from the fuel nozzle vaporizes instantaneously,
Liquid fuel that does not vaporize is not sent to the combustion section, and liquid fuel that has not completely vaporized does not flow down to the bottom of the vaporizer, and stable combustion can be performed. Therefore, it is possible to prevent problems such as breathing of red fire, non-uniform flame, generation of tar at the bottom of the vaporization chamber, and accumulation. Further, since there is no time delay in vaporization of the liquid fuel flowing down to the bottom of the vaporization chamber, it is possible to suppress generation of odor at the time of starting combustion or stopping combustion.

The liquid fuel combustion apparatus of the present invention has a simple structure, is economical, and has a large effect, and therefore has a high industrial value.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a liquid fuel combustion apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory plan view showing a main part of FIG. 1 in section.

FIG. 3 is a sectional view of a main part of a conventional liquid fuel combustion device.

[Explanation of symbols]

 1b Vaporizer 2 Perimeter wall 3 Heater 4 Primary air pipe 5 Connecting pipe 6 Blower 7 Liquid fuel supply pipe 8 Pump 9 Fuel tank 10 Vaporization chamber 11 Fuel nozzle 12 Cartridge tank 13 Throttle plate 14 Burner head 15 Flame hole 16 Flame holding plate 17 Burner case 18 Secondary air pipe 19 Baffle plate 20 Air nozzle part 23 Convex part 24 Rectifying cylinder 24a Upper rectifying cylinder 24b Lower rectifying cylinder 25 Fixture 26 Wire mesh

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23D 11/10 F23D 11/40-11/44

Claims (1)

(57) [Claims] 1. A fuel nozzle, a vaporizer for internally vaporizing liquid fuel ejected and supplied by the fuel nozzle, and premixing the vaporized gas and combustion air to supply the mixture to a combustion section; and an air nozzle for combustion air supply provided in the peripheral wall, the liquid fuel combustion apparatus provided with a blower for feeding combustion air to the air nozzle, solid to the peripheral wall
Evaporates the rectifying cylinder consisting of the specified upper rectifying cylinder and lower rectifying cylinder
Installed inside the room, the upper end of the upper rectifying cylinder extends into the combustion section
However, the lower end of the lower rectifier cylinder extends to near the bottom of the carburetor.
Thus , a convex portion is provided at the bottom of the vaporizer, and the convex portion is located at an interval in the rectifying cylinder, so that the mixture of the liquid fuel and the combustion air jetted and supplied into the vaporizing chamber is supplied to the lower rectifying cylinder. A liquid fuel combustion device, wherein the liquid fuel is supplied to a combustion section after passing around a lower end and between a convex portion and a straightening cylinder.